1// SPDX-License-Identifier: GPL-2.0 2/* 3 * Copyright (C) 2000, 2002 Jeff Dike (jdike@karaya.com) 4 */ 5 6#include <linux/fs.h> 7#include <linux/tty.h> 8#include <linux/tty_driver.h> 9#include <linux/major.h> 10#include <linux/mm.h> 11#include <linux/init.h> 12#include <linux/console.h> 13#include <asm/termbits.h> 14#include <asm/irq.h> 15#include "chan.h" 16#include <init.h> 17#include <irq_user.h> 18#include "mconsole_kern.h" 19 20static const int ssl_version = 1; 21 22#define NR_PORTS 64 23 24static void ssl_announce(char *dev_name, int dev) 25{ 26 printk(KERN_INFO "Serial line %d assigned device '%s'\n", dev, 27 dev_name); 28} 29 30/* Almost const, except that xterm_title may be changed in an initcall */ 31static struct chan_opts opts = { 32 .announce = ssl_announce, 33 .xterm_title = "Serial Line #%d", 34 .raw = 1, 35}; 36 37static int ssl_config(char *str, char **error_out); 38static int ssl_get_config(char *dev, char *str, int size, char **error_out); 39static int ssl_remove(int n, char **error_out); 40 41 42/* Const, except for .mc.list */ 43static struct line_driver driver = { 44 .name = "UML serial line", 45 .device_name = "ttyS", 46 .major = TTY_MAJOR, 47 .minor_start = 64, 48 .type = TTY_DRIVER_TYPE_SERIAL, 49 .subtype = 0, 50 .read_irq = SSL_IRQ, 51 .read_irq_name = "ssl", 52 .write_irq = SSL_WRITE_IRQ, 53 .write_irq_name = "ssl-write", 54 .mc = { 55 .list = LIST_HEAD_INIT(driver.mc.list), 56 .name = "ssl", 57 .config = ssl_config, 58 .get_config = ssl_get_config, 59 .id = line_id, 60 .remove = ssl_remove, 61 }, 62}; 63 64/* The array is initialized by line_init, at initcall time. The 65 * elements are locked individually as needed. 66 */ 67static char *conf[NR_PORTS]; 68static char *def_conf = CONFIG_SSL_CHAN; 69static struct line serial_lines[NR_PORTS]; 70 71static int ssl_config(char *str, char **error_out) 72{ 73 return line_config(serial_lines, ARRAY_SIZE(serial_lines), str, &opts, 74 error_out); 75} 76 77static int ssl_get_config(char *dev, char *str, int size, char **error_out) 78{ 79 return line_get_config(dev, serial_lines, ARRAY_SIZE(serial_lines), str, 80 size, error_out); 81} 82 83static int ssl_remove(int n, char **error_out) 84{ 85 return line_remove(serial_lines, ARRAY_SIZE(serial_lines), n, 86 error_out); 87} 88 89static int ssl_install(struct tty_driver *driver, struct tty_struct *tty) 90{ 91 return line_install(driver, tty, &serial_lines[tty->index]); 92} 93 94static const struct tty_operations ssl_ops = { 95 .open = line_open, 96 .close = line_close, 97 .write = line_write, 98 .write_room = line_write_room, 99 .chars_in_buffer = line_chars_in_buffer, 100 .flush_buffer = line_flush_buffer, 101 .flush_chars = line_flush_chars, 102 .set_termios = line_set_termios, 103 .throttle = line_throttle, 104 .unthrottle = line_unthrottle, 105 .install = ssl_install, 106 .hangup = line_hangup, 107}; 108 109/* Changed by ssl_init and referenced by ssl_exit, which are both serialized 110 * by being an initcall and exitcall, respectively. 111 */ 112static int ssl_init_done = 0; 113 114static void ssl_console_write(struct console *c, const char *string, 115 unsigned len) 116{ 117 struct line *line = &serial_lines[c->index]; 118 unsigned long flags; 119 120 spin_lock_irqsave(&line->lock, flags); 121 console_write_chan(line->chan_out, string, len); 122 spin_unlock_irqrestore(&line->lock, flags); 123} 124 125static struct tty_driver *ssl_console_device(struct console *c, int *index) 126{ 127 *index = c->index; 128 return driver.driver; 129} 130 131static int ssl_console_setup(struct console *co, char *options) 132{ 133 struct line *line = &serial_lines[co->index]; 134 135 return console_open_chan(line, co); 136} 137 138/* No locking for register_console call - relies on single-threaded initcalls */ 139static struct console ssl_cons = { 140 .name = "ttyS", 141 .write = ssl_console_write, 142 .device = ssl_console_device, 143 .setup = ssl_console_setup, 144 .flags = CON_PRINTBUFFER|CON_ANYTIME, 145 .index = -1, 146}; 147 148static int ssl_init(void) 149{ 150 char *new_title; 151 int err; 152 int i; 153 154 printk(KERN_INFO "Initializing software serial port version %d\n", 155 ssl_version); 156 157 err = register_lines(&driver, &ssl_ops, serial_lines, 158 ARRAY_SIZE(serial_lines)); 159 if (err) 160 return err; 161 162 new_title = add_xterm_umid(opts.xterm_title); 163 if (new_title != NULL) 164 opts.xterm_title = new_title; 165 166 for (i = 0; i < NR_PORTS; i++) { 167 char *error; 168 char *s = conf[i]; 169 if (!s) 170 s = def_conf; 171 if (setup_one_line(serial_lines, i, s, &opts, &error)) 172 printk(KERN_ERR "setup_one_line failed for " 173 "device %d : %s\n", i, error); 174 } 175 176 ssl_init_done = 1; 177 register_console(&ssl_cons); 178 return 0; 179} 180late_initcall(ssl_init); 181 182static void ssl_exit(void) 183{ 184 if (!ssl_init_done) 185 return; 186 close_lines(serial_lines, ARRAY_SIZE(serial_lines)); 187} 188__uml_exitcall(ssl_exit); 189 190static int ssl_chan_setup(char *str) 191{ 192 line_setup(conf, NR_PORTS, &def_conf, str, "serial line"); 193 return 1; 194} 195 196__setup("ssl", ssl_chan_setup); 197__channel_help(ssl_chan_setup, "ssl"); 198 199static int ssl_non_raw_setup(char *str) 200{ 201 opts.raw = 0; 202 return 1; 203} 204__setup("ssl-non-raw", ssl_non_raw_setup); 205__channel_help(ssl_non_raw_setup, "set serial lines to non-raw mode"); 206