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