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 "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 */
  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 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
  33 struct line {
  34         struct tty_struct *tty;
  35         spinlock_t count_lock;
  36         int valid;
  37
  38         char *init_str;
  39         int init_pri;
  40         struct list_head chan_list;
  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         char *buffer;
  51         char *head;
  52         char *tail;
  53
  54         int sigio;
  55         struct delayed_work task;
  56         const struct line_driver *driver;
  57         int have_irq;
  58 };
  59
  60 #define LINE_INIT(str, d) \
  61         { .count_lock = SPIN_LOCK_UNLOCKED, \
  62           .init_str =   str,    \
  63           .init_pri =   INIT_STATIC, \
  64           .valid =      1, \
  65           .lock =       SPIN_LOCK_UNLOCKED, \
  66           .driver =     d }
  67
  68 extern void line_close(struct tty_struct *tty, struct file * filp);
  69 extern int line_open(struct line *lines, struct tty_struct *tty);
  70 extern int line_setup(struct line *lines, unsigned int sizeof_lines,
  71                       char *init, char **error_out);
  72 extern int line_write(struct tty_struct *tty, const unsigned char *buf,
  73                       int len);
  74 extern void line_put_char(struct tty_struct *tty, unsigned char ch);
  75 extern void line_set_termios(struct tty_struct *tty, struct ktermios * old);
  76 extern int line_chars_in_buffer(struct tty_struct *tty);
  77 extern void line_flush_buffer(struct tty_struct *tty);
  78 extern void line_flush_chars(struct tty_struct *tty);
  79 extern int line_write_room(struct tty_struct *tty);
  80 extern int line_ioctl(struct tty_struct *tty, struct file * file,
  81                       unsigned int cmd, unsigned long arg);
  82 extern void line_throttle(struct tty_struct *tty);
  83 extern void line_unthrottle(struct tty_struct *tty);
  84
  85 extern char *add_xterm_umid(char *base);
  86 extern int line_setup_irq(int fd, int input, int output, struct line *line,
  87                           void *data);
  88 extern void line_close_chan(struct line *line);
  89 extern struct tty_driver *register_lines(struct line_driver *line_driver,
  90                                          const struct tty_operations *driver,
  91                                          struct line *lines, int nlines);
  92 extern void lines_init(struct line *lines, int nlines, struct chan_opts *opts);
  93 extern void close_lines(struct line *lines, int nlines);
  94
  95 extern int line_config(struct line *lines, unsigned int sizeof_lines,
  96                        char *str, const struct chan_opts *opts,
  97                        char **error_out);
  98 extern int line_id(char **str, int *start_out, int *end_out);
  99 extern int line_remove(struct line *lines, unsigned int sizeof_lines, int n,
 100                        char **error_out);
 101 extern int line_get_config(char *dev, struct line *lines,
 102                            unsigned int sizeof_lines, char *str,
 103                            int size, char **error_out);
 104
 105 #endif