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_util.h" 19 #include "kern.h" 20 #include "init.h" 21 #include "irq_user.h" 22 #include "mconsole_kern.h" 23 24 static const int ssl_version = 1; 25 26 /* Referenced only by tty_driver below - presumably it's locked correctly 27 * by the tty driver. 28 */ 29 30 static struct tty_driver *ssl_driver; 31 32 #define NR_PORTS 64 33 34 static void ssl_announce(char *dev_name, int dev) 35 { 36 printk(KERN_INFO "Serial line %d assigned device '%s'\n", dev, 37 dev_name); 38 } 39 40 /* Almost const, except that xterm_title may be changed in an initcall */ 41 static struct chan_opts opts = { 42 .announce = ssl_announce, 43 .xterm_title = "Serial Line #%d", 44 .raw = 1, 45 }; 46 47 static int ssl_config(char *str, char **error_out); 48 static int ssl_get_config(char *dev, char *str, int size, char **error_out); 49 static int ssl_remove(int n, char **error_out); 50 51 52 /* Const, except for .mc.list */ 53 static struct line_driver driver = { 54 .name = "UML serial line", 55 .device_name = "ttyS", 56 .major = TTY_MAJOR, 57 .minor_start = 64, 58 .type = TTY_DRIVER_TYPE_SERIAL, 59 .subtype = 0, 60 .read_irq = SSL_IRQ, 61 .read_irq_name = "ssl", 62 .write_irq = SSL_WRITE_IRQ, 63 .write_irq_name = "ssl-write", 64 .mc = { 65 .list = LIST_HEAD_INIT(driver.mc.list), 66 .name = "ssl", 67 .config = ssl_config, 68 .get_config = ssl_get_config, 69 .id = line_id, 70 .remove = ssl_remove, 71 }, 72 }; 73 74 /* The array is initialized by line_init, at initcall time. The 75 * elements are locked individually as needed. 76 */ 77 static struct line serial_lines[NR_PORTS] = 78 { [0 ... NR_PORTS - 1] = LINE_INIT(CONFIG_SSL_CHAN, &driver) }; 79 80 static int ssl_config(char *str, char **error_out) 81 { 82 return line_config(serial_lines, ARRAY_SIZE(serial_lines), str, &opts, 83 error_out); 84 } 85 86 static int ssl_get_config(char *dev, char *str, int size, char **error_out) 87 { 88 return line_get_config(dev, serial_lines, ARRAY_SIZE(serial_lines), str, 89 size, error_out); 90 } 91 92 static int ssl_remove(int n, char **error_out) 93 { 94 return line_remove(serial_lines, ARRAY_SIZE(serial_lines), n, 95 error_out); 96 } 97 98 static int ssl_open(struct tty_struct *tty, struct file *filp) 99 { 100 int err = line_open(serial_lines, tty); 101 102 if (err) 103 printk(KERN_ERR "Failed to open serial line %d, err = %d\n", 104 tty->index, err); 105 106 return err; 107 } 108 109 #if 0 110 static void ssl_flush_buffer(struct tty_struct *tty) 111 { 112 return; 113 } 114 115 static void ssl_stop(struct tty_struct *tty) 116 { 117 printk(KERN_ERR "Someone should implement ssl_stop\n"); 118 } 119 120 static void ssl_start(struct tty_struct *tty) 121 { 122 printk(KERN_ERR "Someone should implement ssl_start\n"); 123 } 124 125 void ssl_hangup(struct tty_struct *tty) 126 { 127 } 128 #endif 129 130 static const struct tty_operations ssl_ops = { 131 .open = ssl_open, 132 .close = line_close, 133 .write = line_write, 134 .put_char = line_put_char, 135 .write_room = line_write_room, 136 .chars_in_buffer = line_chars_in_buffer, 137 .flush_buffer = line_flush_buffer, 138 .flush_chars = line_flush_chars, 139 .set_termios = line_set_termios, 140 .ioctl = line_ioctl, 141 .throttle = line_throttle, 142 .unthrottle = line_unthrottle, 143 #if 0 144 .stop = ssl_stop, 145 .start = ssl_start, 146 .hangup = ssl_hangup, 147 #endif 148 }; 149 150 /* Changed by ssl_init and referenced by ssl_exit, which are both serialized 151 * by being an initcall and exitcall, respectively. 152 */ 153 static int ssl_init_done = 0; 154 155 static void ssl_console_write(struct console *c, const char *string, 156 unsigned len) 157 { 158 struct line *line = &serial_lines[c->index]; 159 unsigned long flags; 160 161 spin_lock_irqsave(&line->lock, flags); 162 console_write_chan(&line->chan_list, string, len); 163 spin_unlock_irqrestore(&line->lock, flags); 164 } 165 166 static struct tty_driver *ssl_console_device(struct console *c, int *index) 167 { 168 *index = c->index; 169 return ssl_driver; 170 } 171 172 static int ssl_console_setup(struct console *co, char *options) 173 { 174 struct line *line = &serial_lines[co->index]; 175 176 return console_open_chan(line, co); 177 } 178 179 /* No locking for register_console call - relies on single-threaded initcalls */ 180 static struct console ssl_cons = { 181 .name = "ttyS", 182 .write = ssl_console_write, 183 .device = ssl_console_device, 184 .setup = ssl_console_setup, 185 .flags = CON_PRINTBUFFER|CON_ANYTIME, 186 .index = -1, 187 }; 188 189 static int ssl_init(void) 190 { 191 char *new_title; 192 193 printk(KERN_INFO "Initializing software serial port version %d\n", 194 ssl_version); 195 ssl_driver = register_lines(&driver, &ssl_ops, serial_lines, 196 ARRAY_SIZE(serial_lines)); 197 198 new_title = add_xterm_umid(opts.xterm_title); 199 if (new_title != NULL) 200 opts.xterm_title = new_title; 201 202 lines_init(serial_lines, ARRAY_SIZE(serial_lines), &opts); 203 204 ssl_init_done = 1; 205 register_console(&ssl_cons); 206 return 0; 207 } 208 late_initcall(ssl_init); 209 210 static void ssl_exit(void) 211 { 212 if (!ssl_init_done) 213 return; 214 close_lines(serial_lines, ARRAY_SIZE(serial_lines)); 215 } 216 __uml_exitcall(ssl_exit); 217 218 static int ssl_chan_setup(char *str) 219 { 220 char *error; 221 int ret; 222 223 ret = line_setup(serial_lines, ARRAY_SIZE(serial_lines), str, &error); 224 if(ret < 0) 225 printk(KERN_ERR "Failed to set up serial line with " 226 "configuration string \"%s\" : %s\n", str, error); 227 228 return 1; 229 } 230 231 __setup("ssl", ssl_chan_setup); 232 __channel_help(ssl_chan_setup, "ssl"); 233