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