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