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(char *str); 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 .remove = ssl_remove, 73 }, 74 }; 75 76 /* The array is initialized by line_init, which is an initcall. The 77 * individual elements are protected by individual semaphores. 78 */ 79 static struct line serial_lines[NR_PORTS] = 80 { [0 ... NR_PORTS - 1] = LINE_INIT(CONFIG_SSL_CHAN, &driver) }; 81 82 static struct lines lines = LINES_INIT(NR_PORTS); 83 84 static int ssl_config(char *str) 85 { 86 return(line_config(serial_lines, 87 sizeof(serial_lines)/sizeof(serial_lines[0]), str)); 88 } 89 90 static int ssl_get_config(char *dev, char *str, int size, char **error_out) 91 { 92 return(line_get_config(dev, serial_lines, 93 sizeof(serial_lines)/sizeof(serial_lines[0]), 94 str, size, error_out)); 95 } 96 97 static int ssl_remove(char *str) 98 { 99 return(line_remove(serial_lines, 100 sizeof(serial_lines)/sizeof(serial_lines[0]), str)); 101 } 102 103 int ssl_open(struct tty_struct *tty, struct file *filp) 104 { 105 return line_open(serial_lines, tty, &opts); 106 } 107 108 #if 0 109 static void ssl_flush_buffer(struct tty_struct *tty) 110 { 111 return; 112 } 113 114 static void ssl_throttle(struct tty_struct * tty) 115 { 116 printk(KERN_ERR "Someone should implement ssl_throttle\n"); 117 } 118 119 static void ssl_unthrottle(struct tty_struct * tty) 120 { 121 printk(KERN_ERR "Someone should implement ssl_unthrottle\n"); 122 } 123 124 static void ssl_stop(struct tty_struct *tty) 125 { 126 printk(KERN_ERR "Someone should implement ssl_stop\n"); 127 } 128 129 static void ssl_start(struct tty_struct *tty) 130 { 131 printk(KERN_ERR "Someone should implement ssl_start\n"); 132 } 133 134 void ssl_hangup(struct tty_struct *tty) 135 { 136 } 137 #endif 138 139 static struct tty_operations ssl_ops = { 140 .open = ssl_open, 141 .close = line_close, 142 .write = line_write, 143 .put_char = line_put_char, 144 .write_room = line_write_room, 145 .chars_in_buffer = line_chars_in_buffer, 146 .flush_buffer = line_flush_buffer, 147 .flush_chars = line_flush_chars, 148 .set_termios = line_set_termios, 149 .ioctl = line_ioctl, 150 #if 0 151 .throttle = ssl_throttle, 152 .unthrottle = ssl_unthrottle, 153 .stop = ssl_stop, 154 .start = ssl_start, 155 .hangup = ssl_hangup, 156 #endif 157 }; 158 159 /* Changed by ssl_init and referenced by ssl_exit, which are both serialized 160 * by being an initcall and exitcall, respectively. 161 */ 162 static int ssl_init_done = 0; 163 164 static void ssl_console_write(struct console *c, const char *string, 165 unsigned len) 166 { 167 struct line *line = &serial_lines[c->index]; 168 unsigned long flags; 169 170 spin_lock_irqsave(&line->lock, flags); 171 console_write_chan(&line->chan_list, string, len); 172 spin_unlock_irqrestore(&line->lock, flags); 173 } 174 175 static struct tty_driver *ssl_console_device(struct console *c, int *index) 176 { 177 *index = c->index; 178 return ssl_driver; 179 } 180 181 static int ssl_console_setup(struct console *co, char *options) 182 { 183 struct line *line = &serial_lines[co->index]; 184 185 return console_open_chan(line,co,&opts); 186 } 187 188 static struct console ssl_cons = { 189 .name = "ttyS", 190 .write = ssl_console_write, 191 .device = ssl_console_device, 192 .setup = ssl_console_setup, 193 .flags = CON_PRINTBUFFER, 194 .index = -1, 195 }; 196 197 int ssl_init(void) 198 { 199 char *new_title; 200 201 printk(KERN_INFO "Initializing software serial port version %d\n", 202 ssl_version); 203 ssl_driver = line_register_devfs(&lines, &driver, &ssl_ops, 204 serial_lines, ARRAY_SIZE(serial_lines)); 205 206 lines_init(serial_lines, sizeof(serial_lines)/sizeof(serial_lines[0])); 207 208 new_title = add_xterm_umid(opts.xterm_title); 209 if (new_title != NULL) 210 opts.xterm_title = new_title; 211 212 ssl_init_done = 1; 213 register_console(&ssl_cons); 214 return(0); 215 } 216 late_initcall(ssl_init); 217 218 static void ssl_exit(void) 219 { 220 if (!ssl_init_done) 221 return; 222 close_lines(serial_lines, 223 sizeof(serial_lines)/sizeof(serial_lines[0])); 224 } 225 __uml_exitcall(ssl_exit); 226 227 static int ssl_chan_setup(char *str) 228 { 229 return(line_setup(serial_lines, 230 sizeof(serial_lines)/sizeof(serial_lines[0]), 231 str, 1)); 232 } 233 234 __setup("ssl", ssl_chan_setup); 235 __channel_help(ssl_chan_setup, "ssl"); 236