1 /* 2 * Copyright (C) 2000, 2002 Jeff Dike (jdike@karaya.com) 3 * Licensed under the GPL 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 "ssl.h" 16 #include "chan.h" 17 #include "init.h" 18 #include "irq_user.h" 19 #include "mconsole_kern.h" 20 21 static const int ssl_version = 1; 22 23 #define NR_PORTS 64 24 25 static void ssl_announce(char *dev_name, int dev) 26 { 27 printk(KERN_INFO "Serial line %d assigned device '%s'\n", dev, 28 dev_name); 29 } 30 31 /* Almost const, except that xterm_title may be changed in an initcall */ 32 static struct chan_opts opts = { 33 .announce = ssl_announce, 34 .xterm_title = "Serial Line #%d", 35 .raw = 1, 36 }; 37 38 static int ssl_config(char *str, char **error_out); 39 static int ssl_get_config(char *dev, char *str, int size, char **error_out); 40 static int ssl_remove(int n, char **error_out); 41 42 43 /* Const, except for .mc.list */ 44 static struct line_driver driver = { 45 .name = "UML serial line", 46 .device_name = "ttyS", 47 .major = TTY_MAJOR, 48 .minor_start = 64, 49 .type = TTY_DRIVER_TYPE_SERIAL, 50 .subtype = 0, 51 .read_irq = SSL_IRQ, 52 .read_irq_name = "ssl", 53 .write_irq = SSL_WRITE_IRQ, 54 .write_irq_name = "ssl-write", 55 .mc = { 56 .list = LIST_HEAD_INIT(driver.mc.list), 57 .name = "ssl", 58 .config = ssl_config, 59 .get_config = ssl_get_config, 60 .id = line_id, 61 .remove = ssl_remove, 62 }, 63 }; 64 65 /* The array is initialized by line_init, at initcall time. The 66 * elements are locked individually as needed. 67 */ 68 static char *conf[NR_PORTS]; 69 static char *def_conf = CONFIG_SSL_CHAN; 70 static struct line serial_lines[NR_PORTS]; 71 72 static int ssl_config(char *str, char **error_out) 73 { 74 return line_config(serial_lines, ARRAY_SIZE(serial_lines), str, &opts, 75 error_out); 76 } 77 78 static int ssl_get_config(char *dev, char *str, int size, char **error_out) 79 { 80 return line_get_config(dev, serial_lines, ARRAY_SIZE(serial_lines), str, 81 size, error_out); 82 } 83 84 static int ssl_remove(int n, char **error_out) 85 { 86 return line_remove(serial_lines, ARRAY_SIZE(serial_lines), n, 87 error_out); 88 } 89 90 static int ssl_open(struct tty_struct *tty, struct file *filp) 91 { 92 int err = line_open(serial_lines, tty); 93 94 if (err) 95 printk(KERN_ERR "Failed to open serial line %d, err = %d\n", 96 tty->index, err); 97 98 return err; 99 } 100 101 #if 0 102 static void ssl_flush_buffer(struct tty_struct *tty) 103 { 104 return; 105 } 106 107 static void ssl_stop(struct tty_struct *tty) 108 { 109 printk(KERN_ERR "Someone should implement ssl_stop\n"); 110 } 111 112 static void ssl_start(struct tty_struct *tty) 113 { 114 printk(KERN_ERR "Someone should implement ssl_start\n"); 115 } 116 117 void ssl_hangup(struct tty_struct *tty) 118 { 119 } 120 #endif 121 122 static const struct tty_operations ssl_ops = { 123 .open = ssl_open, 124 .close = line_close, 125 .write = line_write, 126 .put_char = line_put_char, 127 .write_room = line_write_room, 128 .chars_in_buffer = line_chars_in_buffer, 129 .flush_buffer = line_flush_buffer, 130 .flush_chars = line_flush_chars, 131 .set_termios = line_set_termios, 132 .ioctl = line_ioctl, 133 .throttle = line_throttle, 134 .unthrottle = line_unthrottle, 135 #if 0 136 .stop = ssl_stop, 137 .start = ssl_start, 138 .hangup = ssl_hangup, 139 #endif 140 }; 141 142 /* Changed by ssl_init and referenced by ssl_exit, which are both serialized 143 * by being an initcall and exitcall, respectively. 144 */ 145 static int ssl_init_done = 0; 146 147 static void ssl_console_write(struct console *c, const char *string, 148 unsigned len) 149 { 150 struct line *line = &serial_lines[c->index]; 151 unsigned long flags; 152 153 spin_lock_irqsave(&line->lock, flags); 154 console_write_chan(line->chan_out, string, len); 155 spin_unlock_irqrestore(&line->lock, flags); 156 } 157 158 static struct tty_driver *ssl_console_device(struct console *c, int *index) 159 { 160 *index = c->index; 161 return driver.driver; 162 } 163 164 static int ssl_console_setup(struct console *co, char *options) 165 { 166 struct line *line = &serial_lines[co->index]; 167 168 return console_open_chan(line, co); 169 } 170 171 /* No locking for register_console call - relies on single-threaded initcalls */ 172 static struct console ssl_cons = { 173 .name = "ttyS", 174 .write = ssl_console_write, 175 .device = ssl_console_device, 176 .setup = ssl_console_setup, 177 .flags = CON_PRINTBUFFER|CON_ANYTIME, 178 .index = -1, 179 }; 180 181 static int ssl_init(void) 182 { 183 char *new_title; 184 int err; 185 int i; 186 187 printk(KERN_INFO "Initializing software serial port version %d\n", 188 ssl_version); 189 190 err = register_lines(&driver, &ssl_ops, serial_lines, 191 ARRAY_SIZE(serial_lines)); 192 if (err) 193 return err; 194 195 new_title = add_xterm_umid(opts.xterm_title); 196 if (new_title != NULL) 197 opts.xterm_title = new_title; 198 199 for (i = 0; i < NR_PORTS; i++) { 200 char *error; 201 char *s = conf[i]; 202 if (!s) 203 s = def_conf; 204 if (setup_one_line(serial_lines, i, s, &opts, &error)) 205 printk(KERN_ERR "setup_one_line failed for " 206 "device %d : %s\n", i, error); 207 } 208 209 ssl_init_done = 1; 210 register_console(&ssl_cons); 211 return 0; 212 } 213 late_initcall(ssl_init); 214 215 static void ssl_exit(void) 216 { 217 if (!ssl_init_done) 218 return; 219 close_lines(serial_lines, ARRAY_SIZE(serial_lines)); 220 } 221 __uml_exitcall(ssl_exit); 222 223 static int ssl_chan_setup(char *str) 224 { 225 line_setup(conf, NR_PORTS, &def_conf, str, "serial line"); 226 return 1; 227 } 228 229 __setup("ssl", ssl_chan_setup); 230 __channel_help(ssl_chan_setup, "ssl"); 231