linux/arch/um/drivers/ssl.c
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   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
  21static const int ssl_version = 1;
  22
  23#define NR_PORTS 64
  24
  25static 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 */
  32static struct chan_opts opts = {
  33        .announce       = ssl_announce,
  34        .xterm_title    = "Serial Line #%d",
  35        .raw            = 1,
  36};
  37
  38static int ssl_config(char *str, char **error_out);
  39static int ssl_get_config(char *dev, char *str, int size, char **error_out);
  40static int ssl_remove(int n, char **error_out);
  41
  42
  43/* Const, except for .mc.list */
  44static 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 */
  68static char *conf[NR_PORTS];
  69static char *def_conf = CONFIG_SSL_CHAN;
  70static struct line serial_lines[NR_PORTS];
  71
  72static 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
  78static 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
  84static 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
  90static int ssl_open(struct tty_struct *tty, struct file *filp)
  91{
  92        int err = line_open(serial_lines, tty);
  93
  94        if (err)
  95                printk(KERN_ERR "Failed to open serial line %d, err = %d\n",
  96                       tty->index, err);
  97
  98        return err;
  99}
 100
 101#if 0
 102static void ssl_flush_buffer(struct tty_struct *tty)
 103{
 104        return;
 105}
 106
 107static void ssl_stop(struct tty_struct *tty)
 108{
 109        printk(KERN_ERR "Someone should implement ssl_stop\n");
 110}
 111
 112static void ssl_start(struct tty_struct *tty)
 113{
 114        printk(KERN_ERR "Someone should implement ssl_start\n");
 115}
 116
 117void ssl_hangup(struct tty_struct *tty)
 118{
 119}
 120#endif
 121
 122static const struct tty_operations ssl_ops = {
 123        .open                   = ssl_open,
 124        .close                  = line_close,
 125        .write                  = line_write,
 126        .put_char               = line_put_char,
 127        .write_room             = line_write_room,
 128        .chars_in_buffer        = line_chars_in_buffer,
 129        .flush_buffer           = line_flush_buffer,
 130        .flush_chars            = line_flush_chars,
 131        .set_termios            = line_set_termios,
 132        .ioctl                  = line_ioctl,
 133        .throttle               = line_throttle,
 134        .unthrottle             = line_unthrottle,
 135#if 0
 136        .stop                   = ssl_stop,
 137        .start                  = ssl_start,
 138        .hangup                 = ssl_hangup,
 139#endif
 140};
 141
 142/* Changed by ssl_init and referenced by ssl_exit, which are both serialized
 143 * by being an initcall and exitcall, respectively.
 144 */
 145static int ssl_init_done = 0;
 146
 147static void ssl_console_write(struct console *c, const char *string,
 148                              unsigned len)
 149{
 150        struct line *line = &serial_lines[c->index];
 151        unsigned long flags;
 152
 153        spin_lock_irqsave(&line->lock, flags);
 154        console_write_chan(line->chan_out, string, len);
 155        spin_unlock_irqrestore(&line->lock, flags);
 156}
 157
 158static struct tty_driver *ssl_console_device(struct console *c, int *index)
 159{
 160        *index = c->index;
 161        return driver.driver;
 162}
 163
 164static int ssl_console_setup(struct console *co, char *options)
 165{
 166        struct line *line = &serial_lines[co->index];
 167
 168        return console_open_chan(line, co);
 169}
 170
 171/* No locking for register_console call - relies on single-threaded initcalls */
 172static struct console ssl_cons = {
 173        .name           = "ttyS",
 174        .write          = ssl_console_write,
 175        .device         = ssl_console_device,
 176        .setup          = ssl_console_setup,
 177        .flags          = CON_PRINTBUFFER|CON_ANYTIME,
 178        .index          = -1,
 179};
 180
 181static int ssl_init(void)
 182{
 183        char *new_title;
 184        int err;
 185        int i;
 186
 187        printk(KERN_INFO "Initializing software serial port version %d\n",
 188               ssl_version);
 189
 190        err = register_lines(&driver, &ssl_ops, serial_lines,
 191                                    ARRAY_SIZE(serial_lines));
 192        if (err)
 193                return err;
 194
 195        new_title = add_xterm_umid(opts.xterm_title);
 196        if (new_title != NULL)
 197                opts.xterm_title = new_title;
 198
 199        for (i = 0; i < NR_PORTS; i++) {
 200                char *error;
 201                char *s = conf[i];
 202                if (!s)
 203                        s = def_conf;
 204                if (setup_one_line(serial_lines, i, s, &opts, &error))
 205                        printk(KERN_ERR "setup_one_line failed for "
 206                               "device %d : %s\n", i, error);
 207        }
 208
 209        ssl_init_done = 1;
 210        register_console(&ssl_cons);
 211        return 0;
 212}
 213late_initcall(ssl_init);
 214
 215static void ssl_exit(void)
 216{
 217        if (!ssl_init_done)
 218                return;
 219        close_lines(serial_lines, ARRAY_SIZE(serial_lines));
 220}
 221__uml_exitcall(ssl_exit);
 222
 223static int ssl_chan_setup(char *str)
 224{
 225        line_setup(conf, NR_PORTS, &def_conf, str, "serial line");
 226        return 1;
 227}
 228
 229__setup("ssl", ssl_chan_setup);
 230__channel_help(ssl_chan_setup, "ssl");
 231
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