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 "line.h" 16 #include "ssl.h" 17 #include "chan_kern.h" 18 #include "kern.h" 19 #include "init.h" 20 #include "irq_user.h" 21 #include "mconsole_kern.h" 22 23 static const int ssl_version = 1; 24 25 /* Referenced only by tty_driver below - presumably it's locked correctly 26 * by the tty driver. 27 */ 28 29 static struct tty_driver *ssl_driver; 30 31 #define NR_PORTS 64 32 33 static void ssl_announce(char *dev_name, int dev) 34 { 35 printk(KERN_INFO "Serial line %d assigned device '%s'\n", dev, 36 dev_name); 37 } 38 39 /* Almost const, except that xterm_title may be changed in an initcall */ 40 static struct chan_opts opts = { 41 .announce = ssl_announce, 42 .xterm_title = "Serial Line #%d", 43 .raw = 1, 44 }; 45 46 static int ssl_config(char *str, char **error_out); 47 static int ssl_get_config(char *dev, char *str, int size, char **error_out); 48 static int ssl_remove(int n, char **error_out); 49 50 51 /* Const, except for .mc.list */ 52 static struct line_driver driver = { 53 .name = "UML serial line", 54 .device_name = "ttyS", 55 .major = TTY_MAJOR, 56 .minor_start = 64, 57 .type = TTY_DRIVER_TYPE_SERIAL, 58 .subtype = 0, 59 .read_irq = SSL_IRQ, 60 .read_irq_name = "ssl", 61 .write_irq = SSL_WRITE_IRQ, 62 .write_irq_name = "ssl-write", 63 .mc = { 64 .list = LIST_HEAD_INIT(driver.mc.list), 65 .name = "ssl", 66 .config = ssl_config, 67 .get_config = ssl_get_config, 68 .id = line_id, 69 .remove = ssl_remove, 70 }, 71 }; 72 73 /* The array is initialized by line_init, at initcall time. The 74 * elements are locked individually as needed. 75 */ 76 static struct line serial_lines[NR_PORTS] = 77 { [0 ... NR_PORTS - 1] = LINE_INIT(CONFIG_SSL_CHAN, &driver) }; 78 79 static int ssl_config(char *str, char **error_out) 80 { 81 return line_config(serial_lines, ARRAY_SIZE(serial_lines), str, &opts, 82 error_out); 83 } 84 85 static int ssl_get_config(char *dev, char *str, int size, char **error_out) 86 { 87 return line_get_config(dev, serial_lines, ARRAY_SIZE(serial_lines), str, 88 size, error_out); 89 } 90 91 static int ssl_remove(int n, char **error_out) 92 { 93 return line_remove(serial_lines, ARRAY_SIZE(serial_lines), n, 94 error_out); 95 } 96 97 static int ssl_open(struct tty_struct *tty, struct file *filp) 98 { 99 int err = line_open(serial_lines, tty); 100 101 if (err) 102 printk(KERN_ERR "Failed to open serial line %d, err = %d\n", 103 tty->index, err); 104 105 return err; 106 } 107 108 #if 0 109 static void ssl_flush_buffer(struct tty_struct *tty) 110 { 111 return; 112 } 113 114 static void ssl_stop(struct tty_struct *tty) 115 { 116 printk(KERN_ERR "Someone should implement ssl_stop\n"); 117 } 118 119 static void ssl_start(struct tty_struct *tty) 120 { 121 printk(KERN_ERR "Someone should implement ssl_start\n"); 122 } 123 124 void ssl_hangup(struct tty_struct *tty) 125 { 126 } 127 #endif 128 129 static const struct tty_operations ssl_ops = { 130 .open = ssl_open, 131 .close = line_close, 132 .write = line_write, 133 .put_char = line_put_char, 134 .write_room = line_write_room, 135 .chars_in_buffer = line_chars_in_buffer, 136 .flush_buffer = line_flush_buffer, 137 .flush_chars = line_flush_chars, 138 .set_termios = line_set_termios, 139 .ioctl = line_ioctl, 140 .throttle = line_throttle, 141 .unthrottle = line_unthrottle, 142 #if 0 143 .stop = ssl_stop, 144 .start = ssl_start, 145 .hangup = ssl_hangup, 146 #endif 147 }; 148 149 /* Changed by ssl_init and referenced by ssl_exit, which are both serialized 150 * by being an initcall and exitcall, respectively. 151 */ 152 static int ssl_init_done = 0; 153 154 static void ssl_console_write(struct console *c, const char *string, 155 unsigned len) 156 { 157 struct line *line = &serial_lines[c->index]; 158 unsigned long flags; 159 160 spin_lock_irqsave(&line->lock, flags); 161 console_write_chan(&line->chan_list, string, len); 162 spin_unlock_irqrestore(&line->lock, flags); 163 } 164 165 static struct tty_driver *ssl_console_device(struct console *c, int *index) 166 { 167 *index = c->index; 168 return ssl_driver; 169 } 170 171 static int ssl_console_setup(struct console *co, char *options) 172 { 173 struct line *line = &serial_lines[co->index]; 174 175 return console_open_chan(line, co); 176 } 177 178 /* No locking for register_console call - relies on single-threaded initcalls */ 179 static struct console ssl_cons = { 180 .name = "ttyS", 181 .write = ssl_console_write, 182 .device = ssl_console_device, 183 .setup = ssl_console_setup, 184 .flags = CON_PRINTBUFFER|CON_ANYTIME, 185 .index = -1, 186 }; 187 188 static int ssl_init(void) 189 { 190 char *new_title; 191 192 printk(KERN_INFO "Initializing software serial port version %d\n", 193 ssl_version); 194 ssl_driver = register_lines(&driver, &ssl_ops, serial_lines, 195 ARRAY_SIZE(serial_lines)); 196 197 new_title = add_xterm_umid(opts.xterm_title); 198 if (new_title != NULL) 199 opts.xterm_title = new_title; 200 201 lines_init(serial_lines, ARRAY_SIZE(serial_lines), &opts); 202 203 ssl_init_done = 1; 204 register_console(&ssl_cons); 205 return 0; 206 } 207 late_initcall(ssl_init); 208 209 static void ssl_exit(void) 210 { 211 if (!ssl_init_done) 212 return; 213 close_lines(serial_lines, ARRAY_SIZE(serial_lines)); 214 } 215 __uml_exitcall(ssl_exit); 216 217 static int ssl_chan_setup(char *str) 218 { 219 char *error; 220 int ret; 221 222 ret = line_setup(serial_lines, ARRAY_SIZE(serial_lines), str, &error); 223 if(ret < 0) 224 printk(KERN_ERR "Failed to set up serial line with " 225 "configuration string \"%s\" : %s\n", str, error); 226 227 return 1; 228 } 229 230 __setup("ssl", ssl_chan_setup); 231 __channel_help(ssl_chan_setup, "ssl"); 232