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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/um/drivers/line.h
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/* SPDX-License-Identifier: GPL-2.0 */

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/* 

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 * Copyright (C) 2001, 2002 Jeff Dike ([email protected])

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 */

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#ifndef __LINE_H__

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#define __LINE_H__

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#include <linux/list.h>

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#include <linux/workqueue.h>

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#include <linux/tty.h>

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#include <linux/interrupt.h>

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#include <linux/spinlock.h>

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#include <linux/mutex.h>

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#include "chan_user.h"

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#include "mconsole_kern.h"

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/* There's only two modifiable fields in this - .mc.list and .driver */

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struct line_driver {

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	const char *name;

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	const char *device_name;

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	const short major;

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	const short minor_start;

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	const short type;

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	const short subtype;

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	const char *read_irq_name;

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	const char *write_irq_name;

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	struct mc_device mc;

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	struct tty_driver *driver;

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};

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struct line {

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	struct tty_port port;

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	int valid;

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	int read_irq, write_irq;

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	char *init_str;

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	struct list_head chan_list;

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	struct chan *chan_in, *chan_out;

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	/*This lock is actually, mostly, local to*/

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	spinlock_t lock;

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	int throttled;

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	/* Yes, this is a real circular buffer.

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	 * XXX: And this should become a struct kfifo!

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	 *

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	 * buffer points to a buffer allocated on demand, of length

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	 * LINE_BUFSIZE, head to the start of the ring, tail to the end.*/

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	u8 *buffer;

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	u8 *head;

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	u8 *tail;

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	int sigio;

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	struct delayed_work task;

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	const struct line_driver *driver;

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};

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extern void line_close(struct tty_struct *tty, struct file * filp);

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extern int line_open(struct tty_struct *tty, struct file *filp);

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extern int line_install(struct tty_driver *driver, struct tty_struct *tty,

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	struct line *line);

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extern void line_cleanup(struct tty_struct *tty);

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extern void line_hangup(struct tty_struct *tty);

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extern int line_setup(char **conf, unsigned nlines, char **def,

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		      char *init, char *name);

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extern ssize_t line_write(struct tty_struct *tty, const u8 *buf, size_t len);

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extern unsigned int line_chars_in_buffer(struct tty_struct *tty);

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extern void line_flush_buffer(struct tty_struct *tty);

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extern void line_flush_chars(struct tty_struct *tty);

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extern unsigned int line_write_room(struct tty_struct *tty);

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extern void line_throttle(struct tty_struct *tty);

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extern void line_unthrottle(struct tty_struct *tty);

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extern char *add_xterm_umid(char *base);

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extern int line_setup_irq(int fd, int input, int output, struct line *line,

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			  void *data);

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extern void line_close_chan(struct line *line);

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extern int register_lines(struct line_driver *line_driver,

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			  const struct tty_operations *driver,

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			  struct line *lines, int nlines);

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extern int setup_one_line(struct line *lines, int n, char *init,

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			  const struct chan_opts *opts, char **error_out);

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extern void close_lines(struct line *lines, int nlines);

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extern int line_config(struct line *lines, unsigned int sizeof_lines,

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		       char *str, const struct chan_opts *opts,

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		       char **error_out);

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extern int line_id(char **str, int *start_out, int *end_out);

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extern int line_remove(struct line *lines, unsigned int sizeof_lines, int n,

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		       char **error_out);

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extern int line_get_config(char *dev, struct line *lines,

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			   unsigned int sizeof_lines, char *str,

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			   int size, char **error_out);

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#endif

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