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ssl.c

/* 
 * Copyright (C) 2000, 2002 Jeff Dike (jdike@karaya.com)
 * Licensed under the GPL
 */

#include "linux/fs.h"
#include "linux/tty.h"
#include "linux/tty_driver.h"
#include "linux/major.h"
#include "linux/mm.h"
#include "linux/init.h"
#include "linux/console.h"
#include "asm/termbits.h"
#include "asm/irq.h"
#include "line.h"
#include "ssl.h"
#include "chan_kern.h"
#include "kern.h"
#include "init.h"
#include "irq_user.h"
#include "mconsole_kern.h"

static const int ssl_version = 1;

/* Referenced only by tty_driver below - presumably it's locked correctly
 * by the tty driver.
 */

static struct tty_driver *ssl_driver;

#define NR_PORTS 64

static void ssl_announce(char *dev_name, int dev)
{
      printk(KERN_INFO "Serial line %d assigned device '%s'\n", dev,
             dev_name);
}

/* Almost const, except that xterm_title may be changed in an initcall */
static struct chan_opts opts = {
      .announce   = ssl_announce,
      .xterm_title      = "Serial Line #%d",
      .raw        = 1,
};

static int ssl_config(char *str, char **error_out);
static int ssl_get_config(char *dev, char *str, int size, char **error_out);
static int ssl_remove(int n, char **error_out);


/* Const, except for .mc.list */
static struct line_driver driver = {
      .name                   = "UML serial line",
      .device_name            = "ttyS",
      .major                  = TTY_MAJOR,
      .minor_start            = 64,
      .type                   = TTY_DRIVER_TYPE_SERIAL,
      .subtype          = 0,
      .read_irq         = SSL_IRQ,
      .read_irq_name          = "ssl",
      .write_irq        = SSL_WRITE_IRQ,
      .write_irq_name   = "ssl-write",
      .mc  = {
            .list       = LIST_HEAD_INIT(driver.mc.list),
            .name             = "ssl",
            .config     = ssl_config,
            .get_config       = ssl_get_config,
            .id         = line_id,
            .remove     = ssl_remove,
      },
};

/* The array is initialized by line_init, at initcall time.  The
 * elements are locked individually as needed.
 */
static struct line serial_lines[NR_PORTS] =
      { [0 ... NR_PORTS - 1] = LINE_INIT(CONFIG_SSL_CHAN, &driver) };

static int ssl_config(char *str, char **error_out)
{
      return line_config(serial_lines, ARRAY_SIZE(serial_lines), str, &opts,
                     error_out);
}

static int ssl_get_config(char *dev, char *str, int size, char **error_out)
{
      return line_get_config(dev, serial_lines, ARRAY_SIZE(serial_lines), str,
                         size, error_out);
}

static int ssl_remove(int n, char **error_out)
{
      return line_remove(serial_lines, ARRAY_SIZE(serial_lines), n,
                     error_out);
}

static int ssl_open(struct tty_struct *tty, struct file *filp)
{
      int err = line_open(serial_lines, tty);

      if (err)
            printk(KERN_ERR "Failed to open serial line %d, err = %d\n",
                   tty->index, err);

      return err;
}

#if 0
static void ssl_flush_buffer(struct tty_struct *tty)
{
      return;
}

static void ssl_stop(struct tty_struct *tty)
{
      printk(KERN_ERR "Someone should implement ssl_stop\n");
}

static void ssl_start(struct tty_struct *tty)
{
      printk(KERN_ERR "Someone should implement ssl_start\n");
}

void ssl_hangup(struct tty_struct *tty)
{
}
#endif

static const struct tty_operations ssl_ops = {
      .open                   = ssl_open,
      .close                  = line_close,
      .write                  = line_write,
      .put_char         = line_put_char,
      .write_room       = line_write_room,
      .chars_in_buffer  = line_chars_in_buffer,
      .flush_buffer           = line_flush_buffer,
      .flush_chars            = line_flush_chars,
      .set_termios            = line_set_termios,
      .ioctl                  = line_ioctl,
      .throttle         = line_throttle,
      .unthrottle             = line_unthrottle,
#if 0
      .stop                   = ssl_stop,
      .start                  = ssl_start,
      .hangup           = ssl_hangup,
#endif
};

/* Changed by ssl_init and referenced by ssl_exit, which are both serialized
 * by being an initcall and exitcall, respectively.
 */
static int ssl_init_done = 0;

static void ssl_console_write(struct console *c, const char *string,
                        unsigned len)
{
      struct line *line = &serial_lines[c->index];
      unsigned long flags;

      spin_lock_irqsave(&line->lock, flags);
      console_write_chan(&line->chan_list, string, len);
      spin_unlock_irqrestore(&line->lock, flags);
}

static struct tty_driver *ssl_console_device(struct console *c, int *index)
{
      *index = c->index;
      return ssl_driver;
}

static int ssl_console_setup(struct console *co, char *options)
{
      struct line *line = &serial_lines[co->index];

      return console_open_chan(line, co);
}

/* No locking for register_console call - relies on single-threaded initcalls */
static struct console ssl_cons = {
      .name       = "ttyS",
      .write            = ssl_console_write,
      .device           = ssl_console_device,
      .setup            = ssl_console_setup,
      .flags            = CON_PRINTBUFFER|CON_ANYTIME,
      .index            = -1,
};

static int ssl_init(void)
{
      char *new_title;

      printk(KERN_INFO "Initializing software serial port version %d\n",
             ssl_version);
      ssl_driver = register_lines(&driver, &ssl_ops, serial_lines,
                            ARRAY_SIZE(serial_lines));

      new_title = add_xterm_umid(opts.xterm_title);
      if (new_title != NULL)
            opts.xterm_title = new_title;

      lines_init(serial_lines, ARRAY_SIZE(serial_lines), &opts);

      ssl_init_done = 1;
      register_console(&ssl_cons);
      return 0;
}
late_initcall(ssl_init);

static void ssl_exit(void)
{
      if (!ssl_init_done)
            return;
      close_lines(serial_lines, ARRAY_SIZE(serial_lines));
}
__uml_exitcall(ssl_exit);

static int ssl_chan_setup(char *str)
{
      char *error;
      int ret;

      ret = line_setup(serial_lines, ARRAY_SIZE(serial_lines), str, &error);
      if(ret < 0)
            printk(KERN_ERR "Failed to set up serial line with "
                   "configuration string \"%s\" : %s\n", str, error);

      return 1;
}

__setup("ssl", ssl_chan_setup);
__channel_help(ssl_chan_setup, "ssl");

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