1 /* 2 * Copyright (C) 2000, 2002 Jeff Dike (jdike@karaya.com) 3 * Licensed under the GPL 4 */ 5 6 #include "linux/config.h" 7 #include "linux/fs.h" 8 #include "linux/tty.h" 9 #include "linux/tty_driver.h" 10 #include "linux/major.h" 11 #include "linux/mm.h" 12 #include "linux/init.h" 13 #include "linux/console.h" 14 #include "asm/termbits.h" 15 #include "asm/irq.h" 16 #include "line.h" 17 #include "ssl.h" 18 #include "chan_kern.h" 19 #include "user_util.h" 20 #include "kern_util.h" 21 #include "kern.h" 22 #include "init.h" 23 #include "irq_user.h" 24 #include "mconsole_kern.h" 25 26 static int ssl_version = 1; 27 28 /* Referenced only by tty_driver below - presumably it's locked correctly 29 * by the tty driver. 30 */ 31 32 static struct tty_driver *ssl_driver; 33 34 #define NR_PORTS 64 35 36 void ssl_announce(char *dev_name, int dev) 37 { 38 printk(KERN_INFO "Serial line %d assigned device '%s'\n", dev, 39 dev_name); 40 } 41 42 static struct chan_opts opts = { 43 .announce = ssl_announce, 44 .xterm_title = "Serial Line #%d", 45 .raw = 1, 46 .tramp_stack = 0, 47 .in_kernel = 1, 48 }; 49 50 static int ssl_config(char *str); 51 static int ssl_get_config(char *dev, char *str, int size, char **error_out); 52 static int ssl_remove(int n); 53 54 static struct line_driver driver = { 55 .name = "UML serial line", 56 .device_name = "ttyS", 57 .devfs_name = "tts/", 58 .major = TTY_MAJOR, 59 .minor_start = 64, 60 .type = TTY_DRIVER_TYPE_SERIAL, 61 .subtype = 0, 62 .read_irq = SSL_IRQ, 63 .read_irq_name = "ssl", 64 .write_irq = SSL_WRITE_IRQ, 65 .write_irq_name = "ssl-write", 66 .symlink_from = "serial", 67 .symlink_to = "tts", 68 .mc = { 69 .name = "ssl", 70 .config = ssl_config, 71 .get_config = ssl_get_config, 72 .id = line_id, 73 .remove = ssl_remove, 74 }, 75 }; 76 77 /* The array is initialized by line_init, which is an initcall. The 78 * individual elements are protected by individual semaphores. 79 */ 80 static struct line serial_lines[NR_PORTS] = 81 { [0 ... NR_PORTS - 1] = LINE_INIT(CONFIG_SSL_CHAN, &driver) }; 82 83 static struct lines lines = LINES_INIT(NR_PORTS); 84 85 static int ssl_config(char *str) 86 { 87 return(line_config(serial_lines, 88 sizeof(serial_lines)/sizeof(serial_lines[0]), str)); 89 } 90 91 static int ssl_get_config(char *dev, char *str, int size, char **error_out) 92 { 93 return(line_get_config(dev, serial_lines, 94 sizeof(serial_lines)/sizeof(serial_lines[0]), 95 str, size, error_out)); 96 } 97 98 static int ssl_remove(int n) 99 { 100 return line_remove(serial_lines, 101 sizeof(serial_lines)/sizeof(serial_lines[0]), n); 102 } 103 104 int ssl_open(struct tty_struct *tty, struct file *filp) 105 { 106 return line_open(serial_lines, tty, &opts); 107 } 108 109 #if 0 110 static void ssl_flush_buffer(struct tty_struct *tty) 111 { 112 return; 113 } 114 115 static void ssl_throttle(struct tty_struct * tty) 116 { 117 printk(KERN_ERR "Someone should implement ssl_throttle\n"); 118 } 119 120 static void ssl_unthrottle(struct tty_struct * tty) 121 { 122 printk(KERN_ERR "Someone should implement ssl_unthrottle\n"); 123 } 124 125 static void ssl_stop(struct tty_struct *tty) 126 { 127 printk(KERN_ERR "Someone should implement ssl_stop\n"); 128 } 129 130 static void ssl_start(struct tty_struct *tty) 131 { 132 printk(KERN_ERR "Someone should implement ssl_start\n"); 133 } 134 135 void ssl_hangup(struct tty_struct *tty) 136 { 137 } 138 #endif 139 140 static struct tty_operations ssl_ops = { 141 .open = ssl_open, 142 .close = line_close, 143 .write = line_write, 144 .put_char = line_put_char, 145 .write_room = line_write_room, 146 .chars_in_buffer = line_chars_in_buffer, 147 .flush_buffer = line_flush_buffer, 148 .flush_chars = line_flush_chars, 149 .set_termios = line_set_termios, 150 .ioctl = line_ioctl, 151 #if 0 152 .throttle = ssl_throttle, 153 .unthrottle = ssl_unthrottle, 154 .stop = ssl_stop, 155 .start = ssl_start, 156 .hangup = ssl_hangup, 157 #endif 158 }; 159 160 /* Changed by ssl_init and referenced by ssl_exit, which are both serialized 161 * by being an initcall and exitcall, respectively. 162 */ 163 static int ssl_init_done = 0; 164 165 static void ssl_console_write(struct console *c, const char *string, 166 unsigned len) 167 { 168 struct line *line = &serial_lines[c->index]; 169 unsigned long flags; 170 171 spin_lock_irqsave(&line->lock, flags); 172 console_write_chan(&line->chan_list, string, len); 173 spin_unlock_irqrestore(&line->lock, flags); 174 } 175 176 static struct tty_driver *ssl_console_device(struct console *c, int *index) 177 { 178 *index = c->index; 179 return ssl_driver; 180 } 181 182 static int ssl_console_setup(struct console *co, char *options) 183 { 184 struct line *line = &serial_lines[co->index]; 185 186 return console_open_chan(line,co,&opts); 187 } 188 189 static struct console ssl_cons = { 190 .name = "ttyS", 191 .write = ssl_console_write, 192 .device = ssl_console_device, 193 .setup = ssl_console_setup, 194 .flags = CON_PRINTBUFFER, 195 .index = -1, 196 }; 197 198 int ssl_init(void) 199 { 200 char *new_title; 201 202 printk(KERN_INFO "Initializing software serial port version %d\n", 203 ssl_version); 204 ssl_driver = line_register_devfs(&lines, &driver, &ssl_ops, 205 serial_lines, ARRAY_SIZE(serial_lines)); 206 207 lines_init(serial_lines, sizeof(serial_lines)/sizeof(serial_lines[0])); 208 209 new_title = add_xterm_umid(opts.xterm_title); 210 if (new_title != NULL) 211 opts.xterm_title = new_title; 212 213 ssl_init_done = 1; 214 register_console(&ssl_cons); 215 return(0); 216 } 217 late_initcall(ssl_init); 218 219 static void ssl_exit(void) 220 { 221 if (!ssl_init_done) 222 return; 223 close_lines(serial_lines, 224 sizeof(serial_lines)/sizeof(serial_lines[0])); 225 } 226 __uml_exitcall(ssl_exit); 227 228 static int ssl_chan_setup(char *str) 229 { 230 return(line_setup(serial_lines, 231 sizeof(serial_lines)/sizeof(serial_lines[0]), 232 str, 1)); 233 } 234 235 __setup("ssl", ssl_chan_setup); 236 __channel_help(ssl_chan_setup, "ssl"); 237