arch/um/include/line.h

   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 "chan_user.h"
  15 #include "mconsole_kern.h"
  16
  17 struct line_driver {
  18         char *name;
  19         char *device_name;
  20         short major;
  21         short minor_start;
  22         short type;
  23         short subtype;
  24         int read_irq;
  25         char *read_irq_name;
  26         int write_irq;
  27         char *write_irq_name;
  28         char *symlink_from;
  29         char *symlink_to;
  30         struct mc_device mc;
  31 };
  32
  33 struct line {
  34         struct tty_struct *tty;
  35         char *init_str;
  36         int init_pri;
  37         struct list_head chan_list;
  38         int valid;
  39         int count;
  40         int throttled;
  41         /*This lock is actually, mostly, local to*/
  42         spinlock_t lock;
  43
  44         /* Yes, this is a real circular buffer.
  45          * XXX: And this should become a struct kfifo!
  46          *
  47          * buffer points to a buffer allocated on demand, of length
  48          * LINE_BUFSIZE, head to the start of the ring, tail to the end.*/
  49         char *buffer;
  50         char *head;
  51         char *tail;
  52
  53         int sigio;
  54         struct delayed_work task;
  55         const struct line_driver *driver;
  56         int have_irq;
  57 };
  58
  59 #define LINE_INIT(str, d) \
  60         { .init_str =   str, \
  61           .init_pri =   INIT_STATIC, \
  62           .valid =      1, \
  63           .lock =       SPIN_LOCK_UNLOCKED, \
  64           .driver =     d }
  65
  66 struct lines {
  67         int num;
  68 };
  69
  70 #define LINES_INIT(n) {  .num = n }
  71
  72 extern void line_close(struct tty_struct *tty, struct file * filp);
  73 extern int line_open(struct line *lines, struct tty_struct *tty);
  74 extern int line_setup(struct line *lines, unsigned int sizeof_lines,
  75                       char *init);
  76 extern int line_write(struct tty_struct *tty, const unsigned char *buf,
  77                       int len);
  78 extern void line_put_char(struct tty_struct *tty, unsigned char ch);
  79 extern void line_set_termios(struct tty_struct *tty, struct termios * old);
  80 extern int line_chars_in_buffer(struct tty_struct *tty);
  81 extern void line_flush_buffer(struct tty_struct *tty);
  82 extern void line_flush_chars(struct tty_struct *tty);
  83 extern int line_write_room(struct tty_struct *tty);
  84 extern int line_ioctl(struct tty_struct *tty, struct file * file,
  85                       unsigned int cmd, unsigned long arg);
  86 extern void line_throttle(struct tty_struct *tty);
  87 extern void line_unthrottle(struct tty_struct *tty);
  88
  89 extern char *add_xterm_umid(char *base);
  90 extern int line_setup_irq(int fd, int input, int output, struct line *line,
  91                           void *data);
  92 extern void line_close_chan(struct line *line);
  93 extern struct tty_driver * line_register_devfs(struct lines *set,
  94                                                struct line_driver *line_driver,
  95                                                const struct tty_operations *driver,
  96                                                struct line *lines, int nlines);
  97 extern void lines_init(struct line *lines, int nlines, struct chan_opts *opts);
  98 extern void close_lines(struct line *lines, int nlines);
  99
 100 extern int line_config(struct line *lines, unsigned int sizeof_lines,
 101                        char *str, const struct chan_opts *opts);
 102 extern int line_id(char **str, int *start_out, int *end_out);
 103 extern int line_remove(struct line *lines, unsigned int sizeof_lines, int n);
 104 extern int line_get_config(char *dev, struct line *lines,
 105                            unsigned int sizeof_lines, char *str,
 106                            int size, char **error_out);
 107
 108 #endif