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