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 static 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 .major = TTY_MAJOR, 58 .minor_start = 64, 59 .type = TTY_DRIVER_TYPE_SERIAL, 60 .subtype = 0, 61 .read_irq = SSL_IRQ, 62 .read_irq_name = "ssl", 63 .write_irq = SSL_WRITE_IRQ, 64 .write_irq_name = "ssl-write", 65 .symlink_from = "serial", 66 .symlink_to = "tts", 67 .mc = { 68 .name = "ssl", 69 .config = ssl_config, 70 .get_config = ssl_get_config, 71 .id = line_id, 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, ARRAY_SIZE(serial_lines), str, &opts); 87 } 88 89 static int ssl_get_config(char *dev, char *str, int size, char **error_out) 90 { 91 return line_get_config(dev, serial_lines, ARRAY_SIZE(serial_lines), str, 92 size, error_out); 93 } 94 95 static int ssl_remove(int n) 96 { 97 return line_remove(serial_lines, ARRAY_SIZE(serial_lines), n); 98 } 99 100 static int ssl_open(struct tty_struct *tty, struct file *filp) 101 { 102 return line_open(serial_lines, tty); 103 } 104 105 #if 0 106 static void ssl_flush_buffer(struct tty_struct *tty) 107 { 108 return; 109 } 110 111 static void ssl_stop(struct tty_struct *tty) 112 { 113 printk(KERN_ERR "Someone should implement ssl_stop\n"); 114 } 115 116 static void ssl_start(struct tty_struct *tty) 117 { 118 printk(KERN_ERR "Someone should implement ssl_start\n"); 119 } 120 121 void ssl_hangup(struct tty_struct *tty) 122 { 123 } 124 #endif 125 126 static struct tty_operations ssl_ops = { 127 .open = ssl_open, 128 .close = line_close, 129 .write = line_write, 130 .put_char = line_put_char, 131 .write_room = line_write_room, 132 .chars_in_buffer = line_chars_in_buffer, 133 .flush_buffer = line_flush_buffer, 134 .flush_chars = line_flush_chars, 135 .set_termios = line_set_termios, 136 .ioctl = line_ioctl, 137 .throttle = line_throttle, 138 .unthrottle = line_unthrottle, 139 #if 0 140 .stop = ssl_stop, 141 .start = ssl_start, 142 .hangup = ssl_hangup, 143 #endif 144 }; 145 146 /* Changed by ssl_init and referenced by ssl_exit, which are both serialized 147 * by being an initcall and exitcall, respectively. 148 */ 149 static int ssl_init_done = 0; 150 151 static void ssl_console_write(struct console *c, const char *string, 152 unsigned len) 153 { 154 struct line *line = &serial_lines[c->index]; 155 unsigned long flags; 156 157 spin_lock_irqsave(&line->lock, flags); 158 console_write_chan(&line->chan_list, string, len); 159 spin_unlock_irqrestore(&line->lock, flags); 160 } 161 162 static struct tty_driver *ssl_console_device(struct console *c, int *index) 163 { 164 *index = c->index; 165 return ssl_driver; 166 } 167 168 static int ssl_console_setup(struct console *co, char *options) 169 { 170 struct line *line = &serial_lines[co->index]; 171 172 return console_open_chan(line, co, &opts); 173 } 174 175 static struct console ssl_cons = { 176 .name = "ttyS", 177 .write = ssl_console_write, 178 .device = ssl_console_device, 179 .setup = ssl_console_setup, 180 .flags = CON_PRINTBUFFER, 181 .index = -1, 182 }; 183 184 static int ssl_init(void) 185 { 186 char *new_title; 187 188 printk(KERN_INFO "Initializing software serial port version %d\n", 189 ssl_version); 190 ssl_driver = line_register_devfs(&lines, &driver, &ssl_ops, 191 serial_lines, 192 ARRAY_SIZE(serial_lines)); 193 194 lines_init(serial_lines, ARRAY_SIZE(serial_lines), &opts); 195 196 new_title = add_xterm_umid(opts.xterm_title); 197 if (new_title != NULL) 198 opts.xterm_title = new_title; 199 200 ssl_init_done = 1; 201 register_console(&ssl_cons); 202 return 0; 203 } 204 late_initcall(ssl_init); 205 206 static void ssl_exit(void) 207 { 208 if (!ssl_init_done) 209 return; 210 close_lines(serial_lines, ARRAY_SIZE(serial_lines)); 211 } 212 __uml_exitcall(ssl_exit); 213 214 static int ssl_chan_setup(char *str) 215 { 216 return line_setup(serial_lines, ARRAY_SIZE(serial_lines), str); 217 } 218 219 __setup("ssl", ssl_chan_setup); 220 __channel_help(ssl_chan_setup, "ssl"); 221