arch/um/drivers/ssl.c

   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 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         .devfs_name             = "tts/",
  58         .major                  = TTY_MAJOR,
  59         .minor_start            = 64,
  60         .type                   = TTY_DRIVER_TYPE_SERIAL,
  61         .subtype                = 0,
  62         .read_irq               = SSL_IRQ,
  63         .read_irq_name          = "ssl",
  64         .write_irq              = SSL_WRITE_IRQ,
  65         .write_irq_name         = "ssl-write",
  66         .symlink_from           = "serial",
  67         .symlink_to             = "tts",
  68         .mc  = {
  69                 .name           = "ssl",
  70                 .config         = ssl_config,
  71                 .get_config     = ssl_get_config,
  72                 .id             = line_id,
  73                 .remove         = ssl_remove,
  74         },
  75 };
  76
  77 /* The array is initialized by line_init, which is an initcall.  The
  78  * individual elements are protected by individual semaphores.
  79  */
  80 static struct line serial_lines[NR_PORTS] =
  81         { [0 ... NR_PORTS - 1] = LINE_INIT(CONFIG_SSL_CHAN, &driver) };
  82
  83 static struct lines lines = LINES_INIT(NR_PORTS);
  84
  85 static int ssl_config(char *str)
  86 {
  87         return(line_config(serial_lines,
  88                            sizeof(serial_lines)/sizeof(serial_lines[0]), str));
  89 }
  90
  91 static int ssl_get_config(char *dev, char *str, int size, char **error_out)
  92 {
  93         return(line_get_config(dev, serial_lines,
  94                                sizeof(serial_lines)/sizeof(serial_lines[0]),
  95                                str, size, error_out));
  96 }
  97
  98 static int ssl_remove(int n)
  99 {
 100         return line_remove(serial_lines,
 101                            sizeof(serial_lines)/sizeof(serial_lines[0]), n);
 102 }
 103
 104 int ssl_open(struct tty_struct *tty, struct file *filp)
 105 {
 106         return line_open(serial_lines, tty, &opts);
 107 }
 108
 109 #if 0
 110 static void ssl_flush_buffer(struct tty_struct *tty)
 111 {
 112         return;
 113 }
 114
 115 static void ssl_throttle(struct tty_struct * tty)
 116 {
 117         printk(KERN_ERR "Someone should implement ssl_throttle\n");
 118 }
 119
 120 static void ssl_unthrottle(struct tty_struct * tty)
 121 {
 122         printk(KERN_ERR "Someone should implement ssl_unthrottle\n");
 123 }
 124
 125 static void ssl_stop(struct tty_struct *tty)
 126 {
 127         printk(KERN_ERR "Someone should implement ssl_stop\n");
 128 }
 129
 130 static void ssl_start(struct tty_struct *tty)
 131 {
 132         printk(KERN_ERR "Someone should implement ssl_start\n");
 133 }
 134
 135 void ssl_hangup(struct tty_struct *tty)
 136 {
 137 }
 138 #endif
 139
 140 static struct tty_operations ssl_ops = {
 141         .open                   = ssl_open,
 142         .close                  = line_close,
 143         .write                  = line_write,
 144         .put_char               = line_put_char,
 145         .write_room             = line_write_room,
 146         .chars_in_buffer        = line_chars_in_buffer,
 147         .flush_buffer           = line_flush_buffer,
 148         .flush_chars            = line_flush_chars,
 149         .set_termios            = line_set_termios,
 150         .ioctl                  = line_ioctl,
 151 #if 0
 152         .throttle               = ssl_throttle,
 153         .unthrottle             = ssl_unthrottle,
 154         .stop                   = ssl_stop,
 155         .start                  = ssl_start,
 156         .hangup                 = ssl_hangup,
 157 #endif
 158 };
 159
 160 /* Changed by ssl_init and referenced by ssl_exit, which are both serialized
 161  * by being an initcall and exitcall, respectively.
 162  */
 163 static int ssl_init_done = 0;
 164
 165 static void ssl_console_write(struct console *c, const char *string,
 166                               unsigned len)
 167 {
 168         struct line *line = &serial_lines[c->index];
 169         unsigned long flags;
 170
 171         spin_lock_irqsave(&line->lock, flags);
 172         console_write_chan(&line->chan_list, string, len);
 173         spin_unlock_irqrestore(&line->lock, flags);
 174 }
 175
 176 static struct tty_driver *ssl_console_device(struct console *c, int *index)
 177 {
 178         *index = c->index;
 179         return ssl_driver;
 180 }
 181
 182 static int ssl_console_setup(struct console *co, char *options)
 183 {
 184         struct line *line = &serial_lines[co->index];
 185
 186         return console_open_chan(line,co,&opts);
 187 }
 188
 189 static struct console ssl_cons = {
 190         .name           = "ttyS",
 191         .write          = ssl_console_write,
 192         .device         = ssl_console_device,
 193         .setup          = ssl_console_setup,
 194         .flags          = CON_PRINTBUFFER,
 195         .index          = -1,
 196 };
 197
 198 int ssl_init(void)
 199 {
 200         char *new_title;
 201
 202         printk(KERN_INFO "Initializing software serial port version %d\n",
 203                ssl_version);
 204         ssl_driver = line_register_devfs(&lines, &driver, &ssl_ops,
 205                                          serial_lines, ARRAY_SIZE(serial_lines));
 206
 207         lines_init(serial_lines, sizeof(serial_lines)/sizeof(serial_lines[0]));
 208
 209         new_title = add_xterm_umid(opts.xterm_title);
 210         if (new_title != NULL)
 211                 opts.xterm_title = new_title;
 212
 213         ssl_init_done = 1;
 214         register_console(&ssl_cons);
 215         return(0);
 216 }
 217 late_initcall(ssl_init);
 218
 219 static void ssl_exit(void)
 220 {
 221         if (!ssl_init_done)
 222                 return;
 223         close_lines(serial_lines,
 224                     sizeof(serial_lines)/sizeof(serial_lines[0]));
 225 }
 226 __uml_exitcall(ssl_exit);
 227
 228 static int ssl_chan_setup(char *str)
 229 {
 230         return(line_setup(serial_lines,
 231                           sizeof(serial_lines)/sizeof(serial_lines[0]),
 232                           str, 1));
 233 }
 234
 235 __setup("ssl", ssl_chan_setup);
 236 __channel_help(ssl_chan_setup, "ssl");