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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2000, 2002 Jeff Dike (jdike@karaya.com)
*/
#include <linux/fs.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/major.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/console.h>
#include <asm/termbits.h>
#include <asm/irq.h>
#include "chan.h"
#include <init.h>
#include <irq_user.h>
#include "mconsole_kern.h"
static const int ssl_version = 1;
#define NR_PORTS 64
static void ssl_announce(char *dev_name, int dev)
{
printk(KERN_INFO "Serial line %d assigned device '%s'\n", dev,
dev_name);
}
/* Almost const, except that xterm_title may be changed in an initcall */
static struct chan_opts opts = {
.announce = ssl_announce,
.xterm_title = "Serial Line #%d",
.raw = 1,
};
static int ssl_config(char *str, char **error_out);
static int ssl_get_config(char *dev, char *str, int size, char **error_out);
static int ssl_remove(int n, char **error_out);
/* Const, except for .mc.list */
static struct line_driver driver = {
.name = "UML serial line",
.device_name = "ttyS",
.major = TTY_MAJOR,
.minor_start = 64,
.type = TTY_DRIVER_TYPE_SERIAL,
.subtype = 0,
.read_irq = SSL_IRQ,
.read_irq_name = "ssl",
.write_irq = SSL_WRITE_IRQ,
.write_irq_name = "ssl-write",
.mc = {
.list = LIST_HEAD_INIT(driver.mc.list),
.name = "ssl",
.config = ssl_config,
.get_config = ssl_get_config,
.id = line_id,
.remove = ssl_remove,
},
};
/* The array is initialized by line_init, at initcall time. The
* elements are locked individually as needed.
*/
static char *conf[NR_PORTS];
static char *def_conf = CONFIG_SSL_CHAN;
static struct line serial_lines[NR_PORTS];
static int ssl_config(char *str, char **error_out)
{
return line_config(serial_lines, ARRAY_SIZE(serial_lines), str, &opts,
error_out);
}
static int ssl_get_config(char *dev, char *str, int size, char **error_out)
{
return line_get_config(dev, serial_lines, ARRAY_SIZE(serial_lines), str,
size, error_out);
}
static int ssl_remove(int n, char **error_out)
{
return line_remove(serial_lines, ARRAY_SIZE(serial_lines), n,
error_out);
}
static int ssl_install(struct tty_driver *driver, struct tty_struct *tty)
{
return line_install(driver, tty, &serial_lines[tty->index]);
}
static const struct tty_operations ssl_ops = {
.open = line_open,
.close = line_close,
.write = line_write,
.put_char = line_put_char,
.write_room = line_write_room,
.chars_in_buffer = line_chars_in_buffer,
.flush_buffer = line_flush_buffer,
.flush_chars = line_flush_chars,
.set_termios = line_set_termios,
.throttle = line_throttle,
.unthrottle = line_unthrottle,
.install = ssl_install,
.hangup = line_hangup,
};
/* Changed by ssl_init and referenced by ssl_exit, which are both serialized
* by being an initcall and exitcall, respectively.
*/
static int ssl_init_done = 0;
static void ssl_console_write(struct console *c, const char *string,
unsigned len)
{
struct line *line = &serial_lines[c->index];
unsigned long flags;
spin_lock_irqsave(&line->lock, flags);
console_write_chan(line->chan_out, string, len);
spin_unlock_irqrestore(&line->lock, flags);
}
static struct tty_driver *ssl_console_device(struct console *c, int *index)
{
*index = c->index;
return driver.driver;
}
static int ssl_console_setup(struct console *co, char *options)
{
struct line *line = &serial_lines[co->index];
return console_open_chan(line, co);
}
/* No locking for register_console call - relies on single-threaded initcalls */
static struct console ssl_cons = {
.name = "ttyS",
.write = ssl_console_write,
.device = ssl_console_device,
.setup = ssl_console_setup,
.flags = CON_PRINTBUFFER|CON_ANYTIME,
.index = -1,
};
static int ssl_init(void)
{
char *new_title;
int err;
int i;
printk(KERN_INFO "Initializing software serial port version %d\n",
ssl_version);
err = register_lines(&driver, &ssl_ops, serial_lines,
ARRAY_SIZE(serial_lines));
if (err)
return err;
new_title = add_xterm_umid(opts.xterm_title);
if (new_title != NULL)
opts.xterm_title = new_title;
for (i = 0; i < NR_PORTS; i++) {
char *error;
char *s = conf[i];
if (!s)
s = def_conf;
if (setup_one_line(serial_lines, i, s, &opts, &error))
printk(KERN_ERR "setup_one_line failed for "
"device %d : %s\n", i, error);
}
ssl_init_done = 1;
register_console(&ssl_cons);
return 0;
}
late_initcall(ssl_init);
static void ssl_exit(void)
{
if (!ssl_init_done)
return;
close_lines(serial_lines, ARRAY_SIZE(serial_lines));
}
__uml_exitcall(ssl_exit);
static int ssl_chan_setup(char *str)
{
line_setup(conf, NR_PORTS, &def_conf, str, "serial line");
return 1;
}
__setup("ssl", ssl_chan_setup);
__channel_help(ssl_chan_setup, "ssl");
static int ssl_non_raw_setup(char *str)
{
opts.raw = 0;
return 1;
}
__setup("ssl-non-raw", ssl_non_raw_setup);
__channel_help(ssl_non_raw_setup, "set serial lines to non-raw mode");
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