Orange Pi5 kernel

// 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,
<------>.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");