arch/um/drivers/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         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
  69 extern void line_close(struct tty_struct *tty, struct file * filp);
  70 extern int line_open(struct line *lines, struct tty_struct *tty);
  71 extern int line_setup(struct line *lines, unsigned int sizeof_lines,
  72                       char *init, char **error_out);
  73 extern int line_write(struct tty_struct *tty, const unsigned char *buf,
  74                       int len);
  75 extern int line_put_char(struct tty_struct *tty, unsigned char ch);
  76 extern void line_set_termios(struct tty_struct *tty, struct ktermios * old);
  77 extern int line_chars_in_buffer(struct tty_struct *tty);
  78 extern void line_flush_buffer(struct tty_struct *tty);
  79 extern void line_flush_chars(struct tty_struct *tty);
  80 extern int line_write_room(struct tty_struct *tty);
  81 extern int line_ioctl(struct tty_struct *tty, unsigned int cmd,
  82                                 unsigned long arg);
  83 extern void line_throttle(struct tty_struct *tty);
  84 extern void line_unthrottle(struct tty_struct *tty);
  85
  86 extern char *add_xterm_umid(char *base);
  87 extern int line_setup_irq(int fd, int input, int output, struct line *line,
  88                           void *data);
  89 extern void line_close_chan(struct line *line);
  90 extern struct tty_driver *register_lines(struct line_driver *line_driver,
  91                                          const struct tty_operations *driver,
  92                                          struct line *lines, int nlines);
  93 extern void lines_init(struct line *lines, int nlines, struct chan_opts *opts);
  94 extern void close_lines(struct line *lines, int nlines);
  95
  96 extern int line_config(struct line *lines, unsigned int sizeof_lines,
  97                        char *str, const struct chan_opts *opts,
  98                        char **error_out);
  99 extern int line_id(char **str, int *start_out, int *end_out);
 100 extern int line_remove(struct line *lines, unsigned int sizeof_lines, int n,
 101                        char **error_out);
 102 extern 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