LXR linux/arch/um/drivers/line.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/* 
   3 * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
   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 two modifiable fields in this - .mc.list and .driver */
  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        struct tty_driver *driver;
  32};
  33
  34struct line {
  35        struct tty_port port;
  36        int valid;
  37
  38        char *init_str;
  39        struct list_head chan_list;
  40        struct chan *chan_in, *chan_out;
  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};
  58
  59extern void line_close(struct tty_struct *tty, struct file * filp);
  60extern int line_open(struct tty_struct *tty, struct file *filp);
  61extern int line_install(struct tty_driver *driver, struct tty_struct *tty,
  62        struct line *line);
  63extern void line_cleanup(struct tty_struct *tty);
  64extern void line_hangup(struct tty_struct *tty);
  65extern int line_setup(char **conf, unsigned nlines, char **def,
  66                      char *init, char *name);
  67extern int line_write(struct tty_struct *tty, const unsigned char *buf,
  68                      int len);
  69extern void line_set_termios(struct tty_struct *tty, struct ktermios * old);
  70extern int line_chars_in_buffer(struct tty_struct *tty);
  71extern void line_flush_buffer(struct tty_struct *tty);
  72extern void line_flush_chars(struct tty_struct *tty);
  73extern int line_write_room(struct tty_struct *tty);
  74extern void line_throttle(struct tty_struct *tty);
  75extern void line_unthrottle(struct tty_struct *tty);
  76
  77extern char *add_xterm_umid(char *base);
  78extern int line_setup_irq(int fd, int input, int output, struct line *line,
  79                          void *data);
  80extern void line_close_chan(struct line *line);
  81extern int register_lines(struct line_driver *line_driver,
  82                          const struct tty_operations *driver,
  83                          struct line *lines, int nlines);
  84extern int setup_one_line(struct line *lines, int n, char *init,
  85                          const struct chan_opts *opts, char **error_out);
  86extern void close_lines(struct line *lines, int nlines);
  87
  88extern int line_config(struct line *lines, unsigned int sizeof_lines,
  89                       char *str, const struct chan_opts *opts,
  90                       char **error_out);
  91extern int line_id(char **str, int *start_out, int *end_out);
  92extern int line_remove(struct line *lines, unsigned int sizeof_lines, int n,
  93                       char **error_out);
  94extern int line_get_config(char *dev, struct line *lines,
  95                           unsigned int sizeof_lines, char *str,
  96                           int size, char **error_out);
  97
  98#endif
  99