drivers/isdn/isdn

/* */
This source file includes following definitions.
isdn_tty_try_read
isdn_tty_readmodem
isdn_tty_dial
isdn_tty_modem_hup
isdn_tty_paranoia_check
isdn_tty_change_speed
isdn_tty_startup
isdn_tty_shutdown
isdn_tty_write
isdn_tty_write_room
isdn_tty_chars_in_buffer
isdn_tty_flush_buffer
isdn_tty_flush_chars
isdn_tty_throttle
isdn_tty_unthrottle
isdn_tty_get_lsr_info
isdn_tty_get_modem_info
isdn_tty_set_modem_info
isdn_tty_ioctl
isdn_tty_set_termios
isdn_tty_block_til_ready
isdn_tty_open
isdn_tty_close
isdn_tty_hangup
isdn_tty_reset_profile
isdn_tty_modem_reset_regs
modem_write_profile
isdn_tty_modem_init
isdn_tty_find_icall
isdn_tty_at_cout
isdn_tty_on_hook
isdn_tty_off_hook
isdn_tty_check_esc
isdn_tty_modem_result
isdn_tty_show_profile
isdn_tty_get_msnstr
isdn_tty_getdial
isdn_tty_parse_at
isdn_tty_edit_at
isdn_tty_modem_escape
isdn_tty_modem_ring
isdn_tty_modem_xmit
isdn_tty_bsent
   1 /* $Id: isdn_tty.c,v 1.3 1996/02/11 02:12:32 fritz Exp fritz $
   2  *
   3  * Linux ISDN subsystem, tty functions and AT-command emulator (linklevel).
   4  *
   5  * Copyright 1994,95,96 by Fritz Elfert (fritz@wuemaus.franken.de)
   6  * Copyright 1995,96    by Thinking Objects Software GmbH Wuerzburg
   7  * 
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2, or (at your option)
  11  * any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 
  21  *
  22  * $Log: isdn_tty.c,v $
  23  * Revision 1.3  1996/02/11 02:12:32  fritz
  24  * Bugfixes according to similar fixes in standard serial.c of kernel.
  25  *
  26  * Revision 1.2  1996/01/22 05:12:25  fritz
  27  * replaced my_atoi by simple_strtoul
  28  *
  29  * Revision 1.1  1996/01/09 04:13:18  fritz
  30  * Initial revision
  31  *
  32  */
  33 
  34 #define __NO_VERSION__
  35 #include <linux/module.h>
  36 #include <linux/isdn.h>
  37 #include "isdn_common.h"
  38 #include "isdn_tty.h"
  39 
  40 /* Prototypes */
  41 
  42 static int  isdn_tty_edit_at(const char *, int, modem_info *, int);
  43 static void isdn_tty_check_esc(const u_char *, u_char, int, int *, int *, int);
  44 static void isdn_tty_modem_reset_regs(atemu *, int);
  45 
  46 /* Leave this unchanged unless you know what you do! */
  47 #define MODEM_PARANOIA_CHECK
  48 #define MODEM_DO_RESTART
  49 
  50 static char *isdn_ttyname_ttyI = "ttyI";
  51 static char *isdn_ttyname_cui  = "cui";
  52 char *isdn_tty_revision        = "$Revision: 1.3 $";
  53 
  54 int isdn_tty_try_read(int i, u_char * buf, int len)
     /*  */
  55 {
  56         int c;
  57         struct tty_struct *tty;
  58 
  59         if (i < 0)
  60                 return 0;
  61         if (dev->mdm.online[i]) {
  62                 if ((tty = dev->mdm.info[i].tty)) {
  63                         if (dev->mdm.info[i].MCR & UART_MCR_RTS) {
  64                                 c = TTY_FLIPBUF_SIZE - tty->flip.count - 1;
  65                                 if (c >= len) {
  66                                         if (len > 1) {
  67                                                 memcpy(tty->flip.char_buf_ptr, buf, len);
  68                                                 tty->flip.count += len;
  69                                                 memset(tty->flip.flag_buf_ptr, 0, len);
  70                                                 if (dev->mdm.atmodem[i].mdmreg[12] & 128)
  71                                                         tty->flip.flag_buf_ptr[len - 1] = 0xff;
  72                                                 tty->flip.flag_buf_ptr += len;
  73                                                 tty->flip.char_buf_ptr += len;
  74                                         } else
  75                                                 tty_insert_flip_char(tty, buf[0], 0);
  76                                         queue_task_irq_off(&tty->flip.tqueue, &tq_timer);
  77                                         return 1;
  78                                 }
  79                         }
  80                 }
  81         }
  82         return 0;
  83 }
  84 
  85 void isdn_tty_readmodem(void)
     /*  */
  86 {
  87         int resched = 0;
  88         int midx;
  89         int i;
  90         int c;
  91         int r;
  92         ulong flags;
  93         struct tty_struct *tty;
  94         modem_info *info;
  95 
  96         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
  97                 if ((midx = dev->m_idx[i]) >= 0)
  98                         if (dev->mdm.online[midx]) {
  99                                 save_flags(flags);
 100                                 cli();
 101                                 r = 0;
 102                                 info = &dev->mdm.info[midx];
 103                                 if ((tty = info->tty)) {
 104                                         if (info->MCR & UART_MCR_RTS) {
 105                                                 c = TTY_FLIPBUF_SIZE - tty->flip.count - 1;
 106                                                 if (c > 0) {
 107                                                         r = isdn_readbchan(info->isdn_driver, info->isdn_channel,
 108                                                                       tty->flip.char_buf_ptr,
 109                                                                       tty->flip.flag_buf_ptr, c, 0);
 110                                                         if (!(dev->mdm.atmodem[midx].mdmreg[12] & 128))
 111                                                                 memset(tty->flip.flag_buf_ptr, 0, r);
 112                                                         tty->flip.count += r;
 113                                                         tty->flip.flag_buf_ptr += r;
 114                                                         tty->flip.char_buf_ptr += r;
 115                                                         if (r)
 116                                                                 queue_task_irq_off(&tty->flip.tqueue, &tq_timer);
 117                                                 }
 118                                         } else
 119                                                 r = 1;
 120                                 } else
 121                                         r = 1;
 122                                 restore_flags(flags);
 123                                 if (r) {
 124                                         dev->mdm.rcvsched[midx] = 0;
 125                                         resched = 1;
 126                                 } else
 127                                         dev->mdm.rcvsched[midx] = 1;
 128                         }
 129         }
 130         if (!resched)
 131                 isdn_timer_ctrl(ISDN_TIMER_MODEMREAD, 0);
 132 }
 133 
 134 /************************************************************
 135  *
 136  * Modem-functions
 137  *
 138  * mostly "stolen" from original Linux-serial.c and friends.
 139  *
 140  ************************************************************/
 141 
 142 static void isdn_tty_dial(char *n, modem_info * info, atemu * m)
     /*  */
 143 {
 144         isdn_ctrl cmd;
 145         ulong flags;
 146         int i;
 147 
 148         save_flags(flags);
 149         cli();
 150         i = isdn_get_free_channel(ISDN_USAGE_MODEM, m->mdmreg[14], m->mdmreg[15], -1, -1);
 151         if (i < 0) {
 152                 restore_flags(flags);
 153                 isdn_tty_modem_result(6, info);
 154         } else {
 155                 if (strlen(m->msn)) {
 156                         info->isdn_driver = dev->drvmap[i];
 157                         info->isdn_channel = dev->chanmap[i];
 158                         info->drv_index = i;
 159                         dev->m_idx[i] = info->line;
 160                         dev->usage[i] |= ISDN_USAGE_OUTGOING;
 161                         isdn_info_update();
 162                         restore_flags(flags);
 163                         cmd.driver = info->isdn_driver;
 164                         cmd.arg = info->isdn_channel;
 165                         cmd.command = ISDN_CMD_CLREAZ;
 166                         dev->drv[info->isdn_driver]->interface->command(&cmd);
 167                         strcpy(cmd.num, isdn_map_eaz2msn(m->msn, info->isdn_driver));
 168                         cmd.driver = info->isdn_driver;
 169                         cmd.command = ISDN_CMD_SETEAZ;
 170                         dev->drv[info->isdn_driver]->interface->command(&cmd);
 171                         cmd.driver = info->isdn_driver;
 172                         cmd.command = ISDN_CMD_SETL2;
 173                         cmd.arg = info->isdn_channel + (m->mdmreg[14] << 8);
 174                         dev->drv[info->isdn_driver]->interface->command(&cmd);
 175                         cmd.driver = info->isdn_driver;
 176                         cmd.command = ISDN_CMD_SETL3;
 177                         cmd.arg = info->isdn_channel + (m->mdmreg[15] << 8);
 178                         dev->drv[info->isdn_driver]->interface->command(&cmd);
 179                         cmd.driver = info->isdn_driver;
 180                         cmd.arg = info->isdn_channel;
 181                         sprintf(cmd.num, "%s,%s,%d,%d", n, isdn_map_eaz2msn(m->msn, info->isdn_driver),
 182                                 m->mdmreg[18], m->mdmreg[19]);
 183                         cmd.command = ISDN_CMD_DIAL;
 184                         dev->mdm.dialing[info->line] = 1;
 185                         strcpy(dev->num[i], n);
 186                         isdn_info_update();
 187                         dev->drv[info->isdn_driver]->interface->command(&cmd);
 188                 } else
 189                         restore_flags(flags);
 190         }
 191 }
 192 
 193 void isdn_tty_modem_hup(modem_info * info)
     /*  */
 194 {
 195         isdn_ctrl cmd;
 196 
 197         dev->mdm.rcvsched[info->line] = 0;
 198         dev->mdm.online[info->line] = 0;
 199         if (info->isdn_driver >= 0) {
 200                 cmd.driver = info->isdn_driver;
 201                 cmd.command = ISDN_CMD_HANGUP;
 202                 cmd.arg = info->isdn_channel;
 203                 dev->drv[info->isdn_driver]->interface->command(&cmd);
 204                 isdn_all_eaz(info->isdn_driver, info->isdn_channel);
 205                 isdn_free_channel(info->isdn_driver, info->isdn_channel, ISDN_USAGE_MODEM);
 206         }
 207         dev->m_idx[info->drv_index] = -1;
 208         info->isdn_driver = -1;
 209         info->isdn_channel = -1;
 210         info->drv_index = -1;
 211 }
 212 
 213 static inline int isdn_tty_paranoia_check(modem_info * info, dev_t device, const char *routine)
     /*  */
 214 {
 215 #ifdef MODEM_PARANOIA_CHECK
 216         if (!info) {
 217                 printk(KERN_WARNING "isdn: null info_struct for (%d, %d) in %s\n",
 218                        MAJOR(device), MINOR(device), routine);
 219                 return 1;
 220         }
 221         if (info->magic != ISDN_ASYNC_MAGIC) {
 222                 printk(KERN_WARNING "isdn: bad magic for modem struct (%d, %d) in %s\n",
 223                        MAJOR(device), MINOR(device), routine);
 224                 return 1;
 225         }
 226 #endif
 227         return 0;
 228 }
 229 
 230 /*
 231  * This routine is called to set the UART divisor registers to match
 232  * the specified baud rate for a serial port.
 233  */
 234 static void isdn_tty_change_speed(modem_info * info)
     /*  */
 235 {
 236         uint cflag, cval, fcr, quot;
 237         int i;
 238 
 239         if (!info->tty || !info->tty->termios)
 240                 return;
 241         cflag = info->tty->termios->c_cflag;
 242 
 243         quot = i = cflag & CBAUD;
 244         if (i & CBAUDEX) {
 245                 i &= ~CBAUDEX;
 246                 if (i < 1 || i > 2)
 247                         info->tty->termios->c_cflag &= ~CBAUDEX;
 248                 else
 249                         i += 15;
 250         }
 251         if (quot) {
 252                 info->MCR |= UART_MCR_DTR;
 253         } else {
 254                 info->MCR &= ~UART_MCR_DTR;
 255                 isdn_tty_modem_reset_regs(&dev->mdm.atmodem[info->line], 0);
 256                 if (dev->mdm.online[info->line]) {
 257 #ifdef ISDN_DEBUG_MODEM_HUP
 258                         printk(KERN_DEBUG "Mhup in changespeed\n");
 259 #endif
 260                         isdn_tty_modem_hup(info);
 261                         isdn_tty_modem_result(3, info);
 262                 }
 263                 return;
 264         }
 265         /* byte size and parity */
 266         cval = cflag & (CSIZE | CSTOPB);
 267         cval >>= 4;
 268         if (cflag & PARENB)
 269                 cval |= UART_LCR_PARITY;
 270         if (!(cflag & PARODD))
 271                 cval |= UART_LCR_EPAR;
 272         fcr = 0;
 273 
 274         /* CTS flow control flag and modem status interrupts */
 275         if (cflag & CRTSCTS) {
 276                 info->flags |= ISDN_ASYNC_CTS_FLOW;
 277         } else
 278                 info->flags &= ~ISDN_ASYNC_CTS_FLOW;
 279         if (cflag & CLOCAL)
 280                 info->flags &= ~ISDN_ASYNC_CHECK_CD;
 281         else {
 282                 info->flags |= ISDN_ASYNC_CHECK_CD;
 283         }
 284 }
 285 
 286 static int isdn_tty_startup(modem_info * info)
     /*  */
 287 {
 288         ulong flags;
 289 
 290         if (info->flags & ISDN_ASYNC_INITIALIZED)
 291                 return 0;
 292         if (!info->type) {
 293                 if (info->tty)
 294                         set_bit(TTY_IO_ERROR, &info->tty->flags);
 295                 return 0;
 296         }
 297         save_flags(flags);
 298         cli();
 299 
 300 #ifdef ISDN_DEBUG_MODEM_OPEN
 301         printk(KERN_DEBUG "starting up ttyi%d ...\n", info->line);
 302 #endif
 303         /*
 304          * Now, initialize the UART 
 305          */
 306         info->MCR = UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2;
 307         if (info->tty)
 308                 clear_bit(TTY_IO_ERROR, &info->tty->flags);
 309         /*
 310          * and set the speed of the serial port
 311          */
 312         isdn_tty_change_speed(info);
 313 
 314         info->flags |= ISDN_ASYNC_INITIALIZED;
 315         dev->mdm.msr[info->line] |= UART_MSR_DSR;
 316 #if FUTURE
 317         info->send_outstanding = 0;
 318 #endif
 319         restore_flags(flags);
 320         return 0;
 321 }
 322 
 323 /*
 324  * This routine will shutdown a serial port; interrupts are disabled, and
 325  * DTR is dropped if the hangup on close termio flag is on.
 326  */
 327 static void isdn_tty_shutdown(modem_info * info)
     /*  */
 328 {
 329         ulong flags;
 330 
 331         if (!(info->flags & ISDN_ASYNC_INITIALIZED))
 332                 return;
 333 #ifdef ISDN_DEBUG_MODEM_OPEN
 334         printk(KERN_DEBUG "Shutting down isdnmodem port %d ....\n", info->line);
 335 #endif
 336         save_flags(flags);
 337         cli();                  /* Disable interrupts */
 338         if (!info->tty || (info->tty->termios->c_cflag & HUPCL)) {
 339                 info->MCR &= ~(UART_MCR_DTR | UART_MCR_RTS);
 340                 isdn_tty_modem_reset_regs(&dev->mdm.atmodem[info->line], 0);
 341                 if (dev->mdm.online[info->line]) {
 342 #ifdef ISDN_DEBUG_MODEM_HUP
 343                         printk(KERN_DEBUG "Mhup in isdn_tty_shutdown\n");
 344 #endif
 345                         isdn_tty_modem_hup(info);
 346                 }
 347         }
 348         if (info->tty)
 349                 set_bit(TTY_IO_ERROR, &info->tty->flags);
 350 
 351         info->flags &= ~ISDN_ASYNC_INITIALIZED;
 352         restore_flags(flags);
 353 }
 354 
 355 static int isdn_tty_write(struct tty_struct *tty, int from_user, const u_char * buf, int count)
     /*  */
 356 {
 357         int c, total = 0;
 358         modem_info *info = (modem_info *) tty->driver_data;
 359         ulong flags;
 360         int i;
 361 
 362         if (isdn_tty_paranoia_check(info, tty->device, "isdn_tty_write"))
 363                 return 0;
 364         if (!tty)
 365                 return 0;
 366         save_flags(flags);
 367         cli();
 368         while (1) {
 369                 c = MIN(count, info->xmit_size - info->xmit_count - 1);
 370                 if (info->isdn_driver >= 0) {
 371 #if 0
 372                         if (info->isdn_driver != 0) {
 373                                 printk(KERN_DEBUG "FIDO: Zwei HW-Treiber geladen? Ansonsten ist was faul.\n");
 374                                 break;
 375                         }
 376                         int drvidx = info->isdn_driver;
 377                         driver *driv = dev->drv[drvidx];
 378                         i = driv->maxbufsize;
 379 #else
 380                         i = dev->drv[info->isdn_driver]->maxbufsize;
 381 #endif
 382                         c = MIN(c, i);
 383                 }
 384                 if (c <= 0)
 385                         break;
 386                 i = info->line;
 387                 if (dev->mdm.online[i]) {
 388                         isdn_tty_check_esc(buf, dev->mdm.atmodem[i].mdmreg[2], c,
 389                                        &(dev->mdm.atmodem[i].pluscount),
 390                              &(dev->mdm.atmodem[i].lastplus), from_user);
 391                         if (from_user)
 392                                 memcpy_fromfs(&(info->xmit_buf[info->xmit_count]), buf, c);
 393                         else
 394                                 memcpy(&(info->xmit_buf[info->xmit_count]), buf, c);
 395                         info->xmit_count += c;
 396                         if (dev->mdm.atmodem[i].mdmreg[13] & 1) {
 397                                 char *bufptr;
 398                                 int buflen;
 399 #if 0
 400                                 printk(KERN_DEBUG "WB1: %d\n", info->xmit_count);
 401 #endif
 402                                 bufptr = info->xmit_buf;
 403                                 buflen = info->xmit_count;
 404                                 if (dev->mdm.atmodem[i].mdmreg[13] & 2) {
 405                                         /* Add T.70 simplyfied header */
 406 
 407 #ifdef ISDN_DEBUG_MODEM_DUMP
 408                                         isdn_dumppkt("T70pack1:", bufptr, buflen, 40);
 409 #endif
 410                                         bufptr -= 4;
 411                                         buflen += 4;
 412                                         memcpy(bufptr, "\1\0\1\0", 4);
 413 #ifdef ISDN_DEBUG_MODEM_DUMP
 414                                         isdn_dumppkt("T70pack2:", bufptr, buflen, 40);
 415 #endif
 416                                 }
 417                                 if (dev->drv[info->isdn_driver]->interface->
 418                                     writebuf(info->isdn_driver, info->isdn_channel, bufptr, buflen, 0) > 0) {
 419                                         info->xmit_count = 0;
 420                                         info->xmit_size = dev->mdm.atmodem[i].mdmreg[16] * 16;
 421 #if FUTURE
 422                                         info->send_outstanding++;
 423                                         dev->mdm.msr[i] &= ~UART_MSR_CTS;
 424 #endif
 425                                         if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
 426                                             tty->ldisc.write_wakeup)
 427                                                 (tty->ldisc.write_wakeup) (tty);
 428                                         wake_up_interruptible(&tty->write_wait);
 429                                 }
 430                         }
 431                 } else {
 432                         if (dev->mdm.dialing[i]) {
 433                                 dev->mdm.dialing[i] = 0;
 434 #ifdef ISDN_DEBUG_MODEM_HUP
 435                                 printk(KERN_DEBUG "Mhup in isdn_tty_write\n");
 436 #endif
 437                                 isdn_tty_modem_hup(info);
 438                                 isdn_tty_modem_result(3, info);
 439                         } else
 440                                 c = isdn_tty_edit_at(buf, c, info, from_user);
 441                 }
 442                 buf += c;
 443                 count -= c;
 444                 total += c;
 445         }
 446         if (info->xmit_count)
 447                 isdn_timer_ctrl(ISDN_TIMER_MODEMXMIT, 1);
 448         restore_flags(flags);
 449         return total;
 450 }
 451 
 452 static int isdn_tty_write_room(struct tty_struct *tty)
     /*  */
 453 {
 454         modem_info *info = (modem_info *) tty->driver_data;
 455         int ret;
 456 
 457         if (isdn_tty_paranoia_check(info, tty->device, "isdn_tty_write_room"))
 458                 return 0;
 459         if (!dev->mdm.online[info->line])
 460                 return info->xmit_size - 1;
 461         ret = info->xmit_size - info->xmit_count - 1;
 462         return (ret < 0) ? 0 : ret;
 463 }
 464 
 465 static int isdn_tty_chars_in_buffer(struct tty_struct *tty)
     /*  */
 466 {
 467         modem_info *info = (modem_info *) tty->driver_data;
 468 
 469         if (isdn_tty_paranoia_check(info, tty->device, "isdn_tty_chars_in_buffer"))
 470                 return 0;
 471         if (!dev->mdm.online[info->line])
 472                 return 0;
 473         return (info->xmit_count);
 474 }
 475 
 476 static void isdn_tty_flush_buffer(struct tty_struct *tty)
     /*  */
 477 {
 478         modem_info *info = (modem_info *) tty->driver_data;
 479         uint flags;
 480 
 481         if (isdn_tty_paranoia_check(info, tty->device, "isdn_tty_flush_buffer"))
 482                 return;
 483         save_flags(flags);
 484         cli();
 485         info->xmit_count = 0;
 486         restore_flags(flags);
 487         wake_up_interruptible(&tty->write_wait);
 488         if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
 489             tty->ldisc.write_wakeup)
 490                 (tty->ldisc.write_wakeup) (tty);
 491 }
 492 
 493 static void isdn_tty_flush_chars(struct tty_struct *tty)
     /*  */
 494 {
 495         modem_info *info = (modem_info *) tty->driver_data;
 496 
 497         if (isdn_tty_paranoia_check(info, tty->device, "isdn_tty_flush_chars"))
 498                 return;
 499         if (info->xmit_count > 0)
 500                 isdn_timer_ctrl(ISDN_TIMER_MODEMXMIT, 1);
 501 }
 502 
 503 /*
 504  * ------------------------------------------------------------
 505  * isdn_tty_throttle()
 506  * 
 507  * This routine is called by the upper-layer tty layer to signal that
 508  * incoming characters should be throttled.
 509  * ------------------------------------------------------------
 510  */
 511 static void isdn_tty_throttle(struct tty_struct *tty)
     /*  */
 512 {
 513         modem_info *info = (modem_info *) tty->driver_data;
 514 
 515         if (isdn_tty_paranoia_check(info, tty->device, "isdn_tty_throttle"))
 516                 return;
 517         if (I_IXOFF(tty))
 518                 info->x_char = STOP_CHAR(tty);
 519         info->MCR &= ~UART_MCR_RTS;
 520 }
 521 
 522 static void isdn_tty_unthrottle(struct tty_struct *tty)
     /*  */
 523 {
 524         modem_info *info = (modem_info *) tty->driver_data;
 525 
 526         if (isdn_tty_paranoia_check(info, tty->device, "isdn_tty_unthrottle"))
 527                 return;
 528         if (I_IXOFF(tty)) {
 529                 if (info->x_char)
 530                         info->x_char = 0;
 531                 else
 532                         info->x_char = START_CHAR(tty);
 533         }
 534         info->MCR |= UART_MCR_RTS;
 535 }
 536 
 537 /*
 538  * ------------------------------------------------------------
 539  * isdn_tty_ioctl() and friends
 540  * ------------------------------------------------------------
 541  */
 542 
 543 /*
 544  * isdn_tty_get_lsr_info - get line status register info
 545  *
 546  * Purpose: Let user call ioctl() to get info when the UART physically
 547  *          is emptied.  On bus types like RS485, the transmitter must
 548  *          release the bus after transmitting. This must be done when
 549  *          the transmit shift register is empty, not be done when the
 550  *          transmit holding register is empty.  This functionality
 551  *          allows RS485 driver to be written in user space. 
 552  */
 553 static int isdn_tty_get_lsr_info(modem_info * info, uint * value)
     /*  */
 554 {
 555         u_char status;
 556         uint result;
 557         ulong flags;
 558 
 559         save_flags(flags);
 560         cli();
 561         status = dev->mdm.msr[info->line];
 562         restore_flags(flags);
 563         result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
 564         put_fs_long(result, (ulong *) value);
 565         return 0;
 566 }
 567 
 568 
 569 static int isdn_tty_get_modem_info(modem_info * info, uint * value)
     /*  */
 570 {
 571         u_char control, status;
 572         uint result;
 573         ulong flags;
 574 
 575         control = info->MCR;
 576         save_flags(flags);
 577         cli();
 578         status = dev->mdm.msr[info->line];
 579         restore_flags(flags);
 580         result = ((control & UART_MCR_RTS) ? TIOCM_RTS : 0)
 581             | ((control & UART_MCR_DTR) ? TIOCM_DTR : 0)
 582             | ((status & UART_MSR_DCD) ? TIOCM_CAR : 0)
 583             | ((status & UART_MSR_RI) ? TIOCM_RNG : 0)
 584             | ((status & UART_MSR_DSR) ? TIOCM_DSR : 0)
 585             | ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
 586         put_fs_long(result, (ulong *) value);
 587         return 0;
 588 }
 589 
 590 static int isdn_tty_set_modem_info(modem_info * info, uint cmd, uint * value)
     /*  */
 591 {
 592         uint arg = get_fs_long((ulong *) value);
 593 
 594         switch (cmd) {
 595         case TIOCMBIS:
 596                 if (arg & TIOCM_RTS) {
 597                         info->MCR |= UART_MCR_RTS;
 598                 }
 599                 if (arg & TIOCM_DTR) {
 600                         info->MCR |= UART_MCR_DTR;
 601                 }
 602                 break;
 603         case TIOCMBIC:
 604                 if (arg & TIOCM_RTS) {
 605                         info->MCR &= ~UART_MCR_RTS;
 606                 }
 607                 if (arg & TIOCM_DTR) {
 608                         info->MCR &= ~UART_MCR_DTR;
 609                         isdn_tty_modem_reset_regs(&dev->mdm.atmodem[info->line], 0);
 610                         if (dev->mdm.online[info->line]) {
 611 #ifdef ISDN_DEBUG_MODEM_HUP
 612                                 printk(KERN_DEBUG "Mhup in TIOCMBIC\n");
 613 #endif
 614                                 isdn_tty_modem_hup(info);
 615                                 isdn_tty_modem_result(3, info);
 616                         }
 617                 }
 618                 break;
 619         case TIOCMSET:
 620                 info->MCR = ((info->MCR & ~(UART_MCR_RTS | UART_MCR_DTR))
 621                              | ((arg & TIOCM_RTS) ? UART_MCR_RTS : 0)
 622                              | ((arg & TIOCM_DTR) ? UART_MCR_DTR : 0));
 623                 if (!(info->MCR & UART_MCR_DTR)) {
 624                         isdn_tty_modem_reset_regs(&dev->mdm.atmodem[info->line], 0);
 625                         if (dev->mdm.online[info->line]) {
 626 #ifdef ISDN_DEBUG_MODEM_HUP
 627                                 printk(KERN_DEBUG "Mhup in TIOCMSET\n");
 628 #endif
 629                                 isdn_tty_modem_hup(info);
 630                                 isdn_tty_modem_result(3, info);
 631                         }
 632                 }
 633                 break;
 634         default:
 635                 return -EINVAL;
 636         }
 637         return 0;
 638 }
 639 
 640 static int isdn_tty_ioctl(struct tty_struct *tty, struct file *file,
     /*  */
 641                        uint cmd, ulong arg)
 642 {
 643         modem_info *info = (modem_info *) tty->driver_data;
 644         int error;
 645         int retval;
 646 
 647         if (isdn_tty_paranoia_check(info, tty->device, "isdn_tty_ioctl"))
 648                 return -ENODEV;
 649         switch (cmd) {
 650         case TCSBRK:            /* SVID version: non-zero arg --> no break */
 651                 retval = tty_check_change(tty);
 652                 if (retval)
 653                         return retval;
 654                 tty_wait_until_sent(tty, 0);
 655                 return 0;
 656         case TCSBRKP:           /* support for POSIX tcsendbreak() */
 657                 retval = tty_check_change(tty);
 658                 if (retval)
 659                         return retval;
 660                 tty_wait_until_sent(tty, 0);
 661                 return 0;
 662         case TIOCGSOFTCAR:
 663                 error = verify_area(VERIFY_WRITE, (void *) arg, sizeof(long));
 664                 if (error)
 665                         return error;
 666                 put_fs_long(C_CLOCAL(tty) ? 1 : 0, (ulong *) arg);
 667                 return 0;
 668         case TIOCSSOFTCAR:
 669                 arg = get_fs_long((ulong *) arg);
 670                 tty->termios->c_cflag =
 671                     ((tty->termios->c_cflag & ~CLOCAL) |
 672                      (arg ? CLOCAL : 0));
 673                 return 0;
 674         case TIOCMGET:
 675                 error = verify_area(VERIFY_WRITE, (void *) arg, sizeof(uint));
 676                 if (error)
 677                         return error;
 678                 return isdn_tty_get_modem_info(info, (uint *) arg);
 679         case TIOCMBIS:
 680         case TIOCMBIC:
 681         case TIOCMSET:
 682                 return isdn_tty_set_modem_info(info, cmd, (uint *) arg);
 683         case TIOCSERGETLSR:     /* Get line status register */
 684                 error = verify_area(VERIFY_WRITE, (void *) arg, sizeof(uint));
 685                 if (error)
 686                         return error;
 687                 else
 688                         return isdn_tty_get_lsr_info(info, (uint *) arg);
 689 
 690         case TIOCGSERIAL:
 691                 return -ENOIOCTLCMD;
 692 #if 0
 693                 error = verify_area(VERIFY_WRITE, (void *) arg,
 694                                     sizeof(struct serial_struct));
 695                 if (error)
 696                         return error;
 697                 return get_serial_info(info,
 698                                        (struct serial_struct *) arg);
 699 #endif
 700         case TIOCSSERIAL:
 701                 return -ENOIOCTLCMD;
 702 #if 0
 703                 return set_serial_info(info,
 704                                        (struct serial_struct *) arg);
 705 #endif
 706         case TIOCSERCONFIG:
 707                 return -ENOIOCTLCMD;
 708 #if 0
 709                 return do_autoconfig(info);
 710 #endif
 711 
 712         case TIOCSERGWILD:
 713                 return -ENOIOCTLCMD;
 714 #if 0
 715                 error = verify_area(VERIFY_WRITE, (void *) arg,
 716                                     sizeof(int));
 717                 if (error)
 718                         return error;
 719                 put_fs_long(modem_wild_int_mask, (ulong *) arg);
 720                 return 0;
 721 #endif
 722         case TIOCSERSWILD:
 723                 return -ENOIOCTLCMD;
 724 #if 0
 725                 if (!suser())
 726                         return -EPERM;
 727                 modem_wild_int_mask = get_fs_long((ulong *) arg);
 728                 if (modem_wild_int_mask < 0)
 729                         modem_wild_int_mask = check_wild_interrupts(0);
 730                 return 0;
 731 #endif
 732         case TIOCSERGSTRUCT:
 733                 return -ENOIOCTLCMD;
 734 #if 0
 735                 error = verify_area(VERIFY_WRITE, (void *) arg,
 736                                     sizeof(modem_info));
 737                 if (error)
 738                         return error;
 739                 memcpy_tofs((modem_info *) arg,
 740                             info, sizeof(modem_info));
 741                 return 0;
 742 #endif
 743         default:
 744 #ifdef ISDN_DEBUG_MODEM_IOCTL
 745                 printk(KERN_DEBUG "unsupp. ioctl 0x%08x on ttyi%d\n", cmd, info->line);
 746 #endif
 747                 return -ENOIOCTLCMD;
 748         }
 749         return 0;
 750 }
 751 
 752 static void isdn_tty_set_termios(struct tty_struct *tty, struct termios *old_termios)
     /*  */
 753 {
 754         modem_info *info = (modem_info *) tty->driver_data;
 755 
 756         if (tty->termios->c_cflag == old_termios->c_cflag)
 757                 return;
 758         isdn_tty_change_speed(info);
 759         if ((old_termios->c_cflag & CRTSCTS) &&
 760             !(tty->termios->c_cflag & CRTSCTS)) {
 761                 tty->hw_stopped = 0;
 762         }
 763 }
 764 
 765 /*
 766  * ------------------------------------------------------------
 767  * isdn_tty_open() and friends
 768  * ------------------------------------------------------------
 769  */
 770 static int isdn_tty_block_til_ready(struct tty_struct *tty, struct file *filp, modem_info * info)
     /*  */
 771 {
 772         struct wait_queue wait = {current, NULL};
 773         int do_clocal = 0;
 774         unsigned long flags;
 775         int retval;
 776 
 777         /*
 778          * If the device is in the middle of being closed, then block
 779          * until it's done, and then try again.
 780          */
 781         if (tty_hung_up_p(filp) ||
 782             (info->flags & ISDN_ASYNC_CLOSING)) {
 783                 if (info->flags & ISDN_ASYNC_CLOSING)
 784                         interruptible_sleep_on(&info->close_wait);
 785 #ifdef MODEM_DO_RESTART
 786                 if (info->flags & ISDN_ASYNC_HUP_NOTIFY)
 787                         return -EAGAIN;
 788                 else
 789                         return -ERESTARTSYS;
 790 #else
 791                 return -EAGAIN;
 792 #endif
 793         }
 794         /*
 795          * If this is a callout device, then just make sure the normal
 796          * device isn't being used.
 797          */
 798         if (tty->driver.subtype == ISDN_SERIAL_TYPE_CALLOUT) {
 799                 if (info->flags & ISDN_ASYNC_NORMAL_ACTIVE)
 800                         return -EBUSY;
 801                 if ((info->flags & ISDN_ASYNC_CALLOUT_ACTIVE) &&
 802                     (info->flags & ISDN_ASYNC_SESSION_LOCKOUT) &&
 803                     (info->session != current->session))
 804                         return -EBUSY;
 805                 if ((info->flags & ISDN_ASYNC_CALLOUT_ACTIVE) &&
 806                     (info->flags & ISDN_ASYNC_PGRP_LOCKOUT) &&
 807                     (info->pgrp != current->pgrp))
 808                         return -EBUSY;
 809                 info->flags |= ISDN_ASYNC_CALLOUT_ACTIVE;
 810                 return 0;
 811         }
 812         /*
 813          * If non-blocking mode is set, then make the check up front
 814          * and then exit.
 815          */
 816         if (filp->f_flags & O_NONBLOCK) {
 817                 if (info->flags & ISDN_ASYNC_CALLOUT_ACTIVE)
 818                         return -EBUSY;
 819                 info->flags |= ISDN_ASYNC_NORMAL_ACTIVE;
 820                 return 0;
 821         }
 822         if (info->flags & ISDN_ASYNC_CALLOUT_ACTIVE) {
 823                 if (info->normal_termios.c_cflag & CLOCAL)
 824                         do_clocal = 1;
 825         } else {
 826                 if (tty->termios->c_cflag & CLOCAL)
 827                         do_clocal = 1;
 828         }
 829         /*
 830          * Block waiting for the carrier detect and the line to become
 831          * free (i.e., not in use by the callout).  While we are in
 832          * this loop, info->count is dropped by one, so that
 833          * isdn_tty_close() knows when to free things.  We restore it upon
 834          * exit, either normal or abnormal.
 835          */
 836         retval = 0;
 837         add_wait_queue(&info->open_wait, &wait);
 838 #ifdef ISDN_DEBUG_MODEM_OPEN
 839         printk(KERN_DEBUG "isdn_tty_block_til_ready before block: ttyi%d, count = %d\n",
 840                info->line, info->count);
 841 #endif
 842         save_flags(flags);
 843         cli();
 844         if (!(tty_hung_up_p(filp)))
 845                 info->count--;
 846         restore_flags(flags);
 847         info->blocked_open++;
 848         while (1) {
 849                 current->state = TASK_INTERRUPTIBLE;
 850                 if (tty_hung_up_p(filp) ||
 851                     !(info->flags & ISDN_ASYNC_INITIALIZED)) {
 852 #ifdef MODEM_DO_RESTART
 853                         if (info->flags & ISDN_ASYNC_HUP_NOTIFY)
 854                                 retval = -EAGAIN;
 855                         else
 856                                 retval = -ERESTARTSYS;
 857 #else
 858                         retval = -EAGAIN;
 859 #endif
 860                         break;
 861                 }
 862                 if (!(info->flags & ISDN_ASYNC_CALLOUT_ACTIVE) &&
 863                     !(info->flags & ISDN_ASYNC_CLOSING) &&
 864                     (do_clocal || (
 865                                           dev->mdm.msr[info->line] &
 866                                           UART_MSR_DCD))) {
 867                         break;
 868                 }
 869                 if (current->signal & ~current->blocked) {
 870                         retval = -ERESTARTSYS;
 871                         break;
 872                 }
 873 #ifdef ISDN_DEBUG_MODEM_OPEN
 874                 printk(KERN_DEBUG "isdn_tty_block_til_ready blocking: ttyi%d, count = %d\n",
 875                        info->line, info->count);
 876 #endif
 877                 schedule();
 878         }
 879         current->state = TASK_RUNNING;
 880         remove_wait_queue(&info->open_wait, &wait);
 881         if (!tty_hung_up_p(filp))
 882                 info->count++;
 883         info->blocked_open--;
 884 #ifdef ISDN_DEBUG_MODEM_OPEN
 885         printk(KERN_DEBUG "isdn_tty_block_til_ready after blocking: ttyi%d, count = %d\n",
 886                info->line, info->count);
 887 #endif
 888         if (retval)
 889                 return retval;
 890         info->flags |= ISDN_ASYNC_NORMAL_ACTIVE;
 891         return 0;
 892 }
 893 
 894 /*
 895  * This routine is called whenever a serial port is opened.  It
 896  * enables interrupts for a serial port, linking in its async structure into
 897  * the IRQ chain.   It also performs the serial-specific
 898  * initialization for the tty structure.
 899  */
 900 static int isdn_tty_open(struct tty_struct *tty, struct file *filp)
     /*  */
 901 {
 902         modem_info *info;
 903         int retval, line;
 904 
 905         line = MINOR(tty->device) - tty->driver.minor_start;
 906         if (line < 0 || line > ISDN_MAX_CHANNELS)
 907                 return -ENODEV;
 908         info = &dev->mdm.info[line];
 909         if (isdn_tty_paranoia_check(info, tty->device, "isdn_tty_open"))
 910                 return -ENODEV;
 911 #ifdef ISDN_DEBUG_MODEM_OPEN
 912         printk(KERN_DEBUG "isdn_tty_open %s%d, count = %d\n", tty->driver.name,
 913                info->line, info->count);
 914 #endif
 915         info->count++;
 916         tty->driver_data = info;
 917         info->tty = tty;
 918         /*
 919          * Start up serial port
 920          */
 921         retval = isdn_tty_startup(info);
 922         if (retval) {
 923 #ifdef ISDN_DEBUG_MODEM_OPEN
 924                 printk(KERN_DEBUG "isdn_tty_open return after startup\n");
 925 #endif
 926                 return retval;
 927         }
 928         retval = isdn_tty_block_til_ready(tty, filp, info);
 929         if (retval) {
 930 #ifdef ISDN_DEBUG_MODEM_OPEN
 931                 printk(KERN_DEBUG "isdn_tty_open return after isdn_tty_block_til_ready \n");
 932 #endif
 933                 return retval;
 934         }
 935         if ((info->count == 1) && (info->flags & ISDN_ASYNC_SPLIT_TERMIOS)) {
 936                 if (tty->driver.subtype == ISDN_SERIAL_TYPE_NORMAL)
 937                         *tty->termios = info->normal_termios;
 938                 else
 939                         *tty->termios = info->callout_termios;
 940                 isdn_tty_change_speed(info);
 941         }
 942         info->session = current->session;
 943         info->pgrp = current->pgrp;
 944 #ifdef ISDN_DEBUG_MODEM_OPEN
 945         printk(KERN_DEBUG "isdn_tty_open ttyi%d successful...\n", info->line);
 946 #endif
 947         dev->modempoll++;
 948 #ifdef ISDN_DEBUG_MODEM_OPEN
 949         printk(KERN_DEBUG "isdn_tty_open normal exit\n");
 950 #endif
 951         return 0;
 952 }
 953 
 954 static void isdn_tty_close(struct tty_struct *tty, struct file *filp)
     /*  */
 955 {
 956         modem_info *info = (modem_info *) tty->driver_data;
 957         ulong flags;
 958         ulong timeout;
 959 
 960         if (!info || isdn_tty_paranoia_check(info, tty->device, "isdn_tty_close"))
 961                 return;
 962         save_flags(flags);
 963         cli();
 964         if (tty_hung_up_p(filp)) {
 965                 restore_flags(flags);
 966 #ifdef ISDN_DEBUG_MODEM_OPEN
 967                 printk(KERN_DEBUG "isdn_tty_close return after tty_hung_up_p\n");
 968 #endif
 969                 return;
 970         }
 971         dev->modempoll--;
 972         if ((tty->count == 1) && (info->count != 1)) {
 973                 /*
 974                  * Uh, oh.  tty->count is 1, which means that the tty
 975                  * structure will be freed.  Info->count should always
 976                  * be one in these conditions.  If it's greater than
 977                  * one, we've got real problems, since it means the
 978                  * serial port won't be shutdown.
 979                  */
 980                 printk(KERN_ERR "isdn_tty_close: bad port count; tty->count is 1, "
 981                        "info->count is %d\n", info->count);
 982                 info->count = 1;
 983         }
 984         if (--info->count < 0) {
 985                 printk(KERN_ERR "isdn_tty_close: bad port count for ttyi%d: %d\n",
 986                        info->line, info->count);
 987                 info->count = 0;
 988         }
 989         if (info->count) {
 990                 restore_flags(flags);
 991 #ifdef ISDN_DEBUG_MODEM_OPEN
 992                 printk(KERN_DEBUG "isdn_tty_close after info->count != 0\n");
 993 #endif
 994                 return;
 995         }
 996         info->flags |= ISDN_ASYNC_CLOSING;
 997         /*
 998          * Save the termios structure, since this port may have
 999          * separate termios for callout and dialin.
1000          */
1001         if (info->flags & ISDN_ASYNC_NORMAL_ACTIVE)
1002                 info->normal_termios = *tty->termios;
1003         if (info->flags & ISDN_ASYNC_CALLOUT_ACTIVE)
1004                 info->callout_termios = *tty->termios;
1005 
1006         tty->closing = 1;
1007 
1008         /*
1009          * At this point we stop accepting input.  To do this, we
1010          * disable the receive line status interrupts, and tell the
1011          * interrupt driver to stop checking the data ready bit in the
1012          * line status register.
1013          */
1014         if (info->flags & ISDN_ASYNC_INITIALIZED) {
1015                 tty_wait_until_sent(tty, 3000);         /* 30 seconds timeout */
1016                 /*
1017                  * Before we drop DTR, make sure the UART transmitter
1018                  * has completely drained; this is especially
1019                  * important if there is a transmit FIFO!
1020                  */
1021                 timeout = jiffies + HZ;
1022                 while (!(dev->mdm.mlr[info->line]
1023                          & UART_LSR_TEMT)) {
1024                         current->state = TASK_INTERRUPTIBLE;
1025                         current->timeout = jiffies + 20;
1026                         schedule();
1027                         if (jiffies > timeout)
1028                                 break;
1029                 }
1030         }
1031         isdn_tty_shutdown(info);
1032         if (tty->driver.flush_buffer)
1033                 tty->driver.flush_buffer(tty);
1034         if (tty->ldisc.flush_buffer)
1035                 tty->ldisc.flush_buffer(tty);
1036         info->tty = 0;
1037         tty->closing = 0;
1038 #if 00
1039         if (tty->ldisc.num != ldiscs[N_TTY].num) {
1040                 if (tty->ldisc.close)
1041                         (tty->ldisc.close) (tty);
1042                 tty->ldisc = ldiscs[N_TTY];
1043                 tty->termios->c_line = N_TTY;
1044                 if (tty->ldisc.open)
1045                         (tty->ldisc.open) (tty);
1046         }
1047 #endif
1048         if (info->blocked_open) {
1049                 if (info->close_delay) {
1050                         current->state = TASK_INTERRUPTIBLE;
1051                         current->timeout = jiffies + info->close_delay;
1052                         schedule();
1053                 }
1054                 wake_up_interruptible(&info->open_wait);
1055         }
1056         info->flags &= ~(ISDN_ASYNC_NORMAL_ACTIVE | ISDN_ASYNC_CALLOUT_ACTIVE |
1057                          ISDN_ASYNC_CLOSING);
1058         wake_up_interruptible(&info->close_wait);
1059         restore_flags(flags);
1060 #ifdef ISDN_DEBUG_MODEM_OPEN
1061         printk(KERN_DEBUG "isdn_tty_close normal exit\n");
1062 #endif
1063 }
1064 
1065 /*
1066  * isdn_tty_hangup() --- called by tty_hangup() when a hangup is signaled.
1067  */
1068 static void isdn_tty_hangup(struct tty_struct *tty)
     /*  */
1069 {
1070         modem_info *info = (modem_info *) tty->driver_data;
1071 
1072         if (isdn_tty_paranoia_check(info, tty->device, "isdn_tty_hangup"))
1073                 return;
1074         isdn_tty_shutdown(info);
1075         info->count = 0;
1076         info->flags &= ~(ISDN_ASYNC_NORMAL_ACTIVE | ISDN_ASYNC_CALLOUT_ACTIVE);
1077         info->tty = 0;
1078         wake_up_interruptible(&info->open_wait);
1079 }
1080 
1081 static void isdn_tty_reset_profile(atemu * m)
     /*  */
1082 {
1083         m->profile[0] = 0;
1084         m->profile[1] = 0;
1085         m->profile[2] = 43;
1086         m->profile[3] = 13;
1087         m->profile[4] = 10;
1088         m->profile[5] = 8;
1089         m->profile[6] = 3;
1090         m->profile[7] = 60;
1091         m->profile[8] = 2;
1092         m->profile[9] = 6;
1093         m->profile[10] = 7;
1094         m->profile[11] = 70;
1095         m->profile[12] = 0x45;
1096         m->profile[13] = 0;
1097         m->profile[14] = ISDN_PROTO_L2_X75I;
1098         m->profile[15] = ISDN_PROTO_L3_TRANS;
1099         m->profile[16] = ISDN_SERIAL_XMIT_SIZE / 16;
1100         m->profile[17] = ISDN_MODEM_WINSIZE;
1101         m->profile[18] = 7;
1102         m->profile[19] = 0;
1103         m->pmsn[0] = '\0';
1104 }
1105 
1106 static void isdn_tty_modem_reset_regs(atemu * m, int force)
     /*  */
1107 {
1108         if ((m->mdmreg[12] & 32) || force) {
1109                 memcpy(m->mdmreg, m->profile, ISDN_MODEM_ANZREG);
1110                 memcpy(m->msn, m->pmsn, ISDN_MSNLEN);
1111         }
1112         m->mdmcmdl = 0;
1113 }
1114 
1115 static void modem_write_profile(atemu * m)
     /*  */
1116 {
1117         memcpy(m->profile, m->mdmreg, ISDN_MODEM_ANZREG);
1118         memcpy(m->pmsn, m->msn, ISDN_MSNLEN);
1119         if (dev->profd)
1120                 send_sig(SIGIO, dev->profd, 1);
1121 }
1122 
1123 int isdn_tty_modem_init(void)
     /*  */
1124 {
1125         modem *m;
1126         int i;
1127         modem_info *info;
1128 
1129         m = &dev->mdm;
1130         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1131                 isdn_tty_reset_profile(&(m->atmodem[i]));
1132                 isdn_tty_modem_reset_regs(&(m->atmodem[i]), 1);
1133         }
1134         memset(&m->tty_modem, 0, sizeof(struct tty_driver));
1135         m->tty_modem.magic = TTY_DRIVER_MAGIC;
1136         m->tty_modem.name = isdn_ttyname_ttyI;
1137         m->tty_modem.major = ISDN_TTY_MAJOR;
1138         m->tty_modem.minor_start = 0;
1139         m->tty_modem.num = ISDN_MAX_CHANNELS;
1140         m->tty_modem.type = TTY_DRIVER_TYPE_SERIAL;
1141         m->tty_modem.subtype = ISDN_SERIAL_TYPE_NORMAL;
1142         m->tty_modem.init_termios = tty_std_termios;
1143         m->tty_modem.init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1144         m->tty_modem.flags = TTY_DRIVER_REAL_RAW;
1145         m->tty_modem.refcount = &m->refcount;
1146         m->tty_modem.table = m->modem_table;
1147         m->tty_modem.termios = m->modem_termios;
1148         m->tty_modem.termios_locked = m->modem_termios_locked;
1149         m->tty_modem.open = isdn_tty_open;
1150         m->tty_modem.close = isdn_tty_close;
1151         m->tty_modem.write = isdn_tty_write;
1152         m->tty_modem.put_char = NULL;
1153         m->tty_modem.flush_chars = isdn_tty_flush_chars;
1154         m->tty_modem.write_room = isdn_tty_write_room;
1155         m->tty_modem.chars_in_buffer = isdn_tty_chars_in_buffer;
1156         m->tty_modem.flush_buffer = isdn_tty_flush_buffer;
1157         m->tty_modem.ioctl = isdn_tty_ioctl;
1158         m->tty_modem.throttle = isdn_tty_throttle;
1159         m->tty_modem.unthrottle = isdn_tty_unthrottle;
1160         m->tty_modem.set_termios = isdn_tty_set_termios;
1161         m->tty_modem.stop = NULL;
1162         m->tty_modem.start = NULL;
1163         m->tty_modem.hangup = isdn_tty_hangup;
1164         /*
1165          * The callout device is just like normal device except for
1166          * major number and the subtype code.
1167          */
1168         m->cua_modem = m->tty_modem;
1169         m->cua_modem.name = isdn_ttyname_cui;
1170         m->cua_modem.major = ISDN_TTYAUX_MAJOR;
1171         m->tty_modem.minor_start = 0;
1172         m->cua_modem.subtype = ISDN_SERIAL_TYPE_CALLOUT;
1173 
1174         if (tty_register_driver(&m->tty_modem)) {
1175                 printk(KERN_WARNING "isdn: Unable to register modem-device\n");
1176                 return -1;
1177         }
1178         if (tty_register_driver(&m->cua_modem)) {
1179                 printk(KERN_WARNING "Couldn't register modem-callout-device\n");
1180                 return -2;
1181         }
1182         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1183                 info = &(m->info[i]);
1184                 info->magic = ISDN_ASYNC_MAGIC;
1185                 info->line = i;
1186                 info->tty = 0;
1187                 info->close_delay = 50;
1188                 info->x_char = 0;
1189                 info->count = 0;
1190                 info->blocked_open = 0;
1191                 info->callout_termios = m->cua_modem.init_termios;
1192                 info->normal_termios = m->tty_modem.init_termios;
1193                 info->open_wait = 0;
1194                 info->close_wait = 0;
1195                 info->type = ISDN_PORT_16550A;
1196                 info->isdn_driver = -1;
1197                 info->isdn_channel = -1;
1198                 info->drv_index = -1;
1199                 info->xmit_size = ISDN_SERIAL_XMIT_SIZE;
1200                 if (!(info->xmit_buf = kmalloc(ISDN_SERIAL_XMIT_SIZE + 5, GFP_KERNEL))) {
1201                         printk(KERN_ERR "Could not allocate modem xmit-buffer\n");
1202                         return -3;
1203                 }
1204                 info->xmit_buf += 4;    /* Make room for T.70 header */
1205         }
1206         return 0;
1207 }
1208 
1209 /*
1210  * An incoming call-request has arrived.
1211  * Search the tty-devices for an aproppriate device and bind
1212  * it to the ISDN-Channel.
1213  * Return Index to dev->mdm or -1 if none found.
1214  */
1215 int isdn_tty_find_icall(int di, int ch, char *num)
     /*  */
1216 {
1217         char *eaz;
1218         int i;
1219         int idx;
1220         int si1;
1221         int si2;
1222         char *s;
1223         char nr[31];
1224         ulong flags;
1225 
1226         save_flags(flags);
1227         cli();
1228         if (num[0] == ',') {
1229                 nr[0] = '0';
1230                 strncpy(&nr[1], num, 29);
1231                 printk(KERN_WARNING "isdn: Incoming call without OAD, assuming '0'\n");
1232         } else
1233                 strncpy(nr, num, 30);
1234         s = strtok(nr, ",");
1235         s = strtok(NULL, ",");
1236         if (!s) {
1237                 printk(KERN_WARNING "isdn: Incoming callinfo garbled, ignored: %s\n",
1238                        num);
1239                 restore_flags(flags);
1240                 return -1;
1241         }
1242         si1 = (int)simple_strtoul(s,NULL,10);
1243         s = strtok(NULL, ",");
1244         if (!s) {
1245                 printk(KERN_WARNING "isdn: Incoming callinfo garbled, ignored: %s\n",
1246                        num);
1247                 restore_flags(flags);
1248                 return -1;
1249         }
1250         si2 = (int)simple_strtoul(s,NULL,10);
1251         eaz = strtok(NULL, ",");
1252         if (!eaz) {
1253                 printk(KERN_WARNING "isdn: Incoming call without CPN, assuming '0'\n");
1254                 eaz = "0";
1255         }
1256 #ifdef ISDN_DEBUG_MODEM_ICALL
1257         printk(KERN_DEBUG "m_fi: eaz=%s si1=%d si2=%d\n", eaz, si1, si2);
1258 #endif
1259         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1260 #ifdef ISDN_DEBUG_MODEM_ICALL
1261                 printk(KERN_DEBUG "m_fi: i=%d msn=%s mmsn=%s mreg18=%d mreg19=%d\n", i,
1262                        dev->mdm.atmodem[i].msn, isdn_map_eaz2msn(dev->mdm.atmodem[i].msn, di),
1263                        dev->mdm.atmodem[i].mdmreg[18], dev->mdm.atmodem[i].mdmreg[19]);
1264 #endif
1265                 if ((!strcmp(isdn_map_eaz2msn(dev->mdm.atmodem[i].msn, di)
1266                              ,eaz)) &&  /* EAZ is matching   */
1267                     (dev->mdm.atmodem[i].mdmreg[18] == si1) &&  /* SI1 is matching   */
1268                     (dev->mdm.atmodem[i].mdmreg[19] == si2)) {  /* SI2 is matching   */
1269                         modem_info *info = &dev->mdm.info[i];
1270                         idx = isdn_dc2minor(di, ch);
1271 #ifdef ISDN_DEBUG_MODEM_ICALL
1272                         printk(KERN_DEBUG "m_fi: match1\n");
1273                         printk(KERN_DEBUG "m_fi: idx=%d flags=%08lx drv=%d ch=%d usg=%d\n", idx,
1274                                info->flags, info->isdn_driver, info->isdn_channel,
1275                                dev->usage[idx]);
1276 #endif
1277                         if ((info->flags & ISDN_ASYNC_NORMAL_ACTIVE) &&
1278                             (info->isdn_driver == -1) &&
1279                             (info->isdn_channel == -1) &&
1280                             (USG_NONE(dev->usage[idx]))) {
1281                                 info->isdn_driver = di;
1282                                 info->isdn_channel = ch;
1283                                 info->drv_index = idx;
1284                                 dev->m_idx[idx] = info->line;
1285                                 dev->usage[idx] &= ISDN_USAGE_EXCLUSIVE;
1286                                 dev->usage[idx] |= ISDN_USAGE_MODEM;
1287                                 strcpy(dev->num[idx], nr);
1288                                 isdn_info_update();
1289                                 restore_flags(flags);
1290                                 printk(KERN_INFO "isdn_tty: call from %s, -> RING on ttyI%d\n", nr,
1291                                        info->line);
1292                                 return info->line;
1293                         }
1294                 }
1295         }
1296         printk(KERN_INFO "isdn_tty: call from %s -> %s %s\n", nr, eaz,
1297                dev->drv[di]->reject_bus ? "rejected" : "ignored");
1298         restore_flags(flags);
1299         return -1;
1300 }
1301 
1302 /*********************************************************************
1303  Modem-Emulator-Routines
1304  *********************************************************************/
1305 
1306 #define cmdchar(c) ((c>' ')&&(c<=0x7f))
1307 
1308 /*
1309  * Put a message from the AT-emulator into receive-buffer of tty,
1310  * convert CR, LF, and BS to values in modem-registers 3, 4 and 5.
1311  */
1312 static void isdn_tty_at_cout(char *msg, modem_info * info)
     /*  */
1313 {
1314         struct tty_struct *tty;
1315         atemu *m = &(dev->mdm.atmodem[info->line]);
1316         char *p;
1317         char c;
1318         ulong flags;
1319 
1320         if (!msg) {
1321                 printk(KERN_WARNING "isdn: Null-Message in isdn_tty_at_cout\n");
1322                 return;
1323         }
1324         save_flags(flags);
1325         cli();
1326         tty = info->tty;
1327         for (p = msg; *p; p++) {
1328                 switch (*p) {
1329                 case '\r':
1330                         c = m->mdmreg[3];
1331                         break;
1332                 case '\n':
1333                         c = m->mdmreg[4];
1334                         break;
1335                 case '\b':
1336                         c = m->mdmreg[5];
1337                         break;
1338                 default:
1339                         c = *p;
1340                 }
1341                 if ((info->flags & ISDN_ASYNC_CLOSING) || (!tty)) {
1342                         restore_flags(flags);
1343                         return;
1344                 }
1345                 if (tty->flip.count >= TTY_FLIPBUF_SIZE)
1346                         break;
1347                 tty_insert_flip_char(tty, c, 0);
1348         }
1349         restore_flags(flags);
1350         queue_task(&tty->flip.tqueue, &tq_timer);
1351 }
1352 
1353 /*
1354  * Perform ATH Hangup
1355  */
1356 static void isdn_tty_on_hook(modem_info * info)
     /*  */
1357 {
1358         if (info->isdn_channel >= 0) {
1359 #ifdef ISDN_DEBUG_MODEM_HUP
1360                 printk(KERN_DEBUG "Mhup in isdn_tty_on_hook\n");
1361 #endif
1362                 isdn_tty_modem_hup(info);
1363                 isdn_tty_modem_result(3, info);
1364         }
1365 }
1366 
1367 static void isdn_tty_off_hook(void)
     /*  */
1368 {
1369         printk(KERN_DEBUG "isdn_tty_off_hook\n");
1370 }
1371 
1372 #define PLUSWAIT1 (HZ/2)        /* 0.5 sec. */
1373 #define PLUSWAIT2 (HZ*3/2)      /* 1.5 sec */
1374 
1375 /*
1376  * Check Buffer for Modem-escape-sequence, activate timer-callback to
1377  * isdn_tty_modem_escape() if sequence found.
1378  *
1379  * Parameters:
1380  *   p          pointer to databuffer
1381  *   plus       escape-character
1382  *   count      length of buffer
1383  *   pluscount  count of valid escape-characters so far
1384  *   lastplus   timestamp of last character
1385  */
1386 static void isdn_tty_check_esc(const u_char * p, u_char plus, int count, int *pluscount,
     /*  */
1387                            int *lastplus, int from_user)
1388 {
1389         char cbuf[3];
1390 
1391         if (plus > 127)
1392                 return;
1393         if (count > 3) {
1394                 p += count - 3;
1395                 count = 3;
1396                 *pluscount = 0;
1397         }
1398         if (from_user) {
1399                 memcpy_fromfs(cbuf, p, count);
1400                 p = cbuf;
1401         }
1402         while (count > 0) {
1403                 if (*(p++) == plus) {
1404                         if ((*pluscount)++) {
1405                                 /* Time since last '+' > 0.5 sec. ? */
1406                                 if ((jiffies - *lastplus) > PLUSWAIT1)
1407                                         *pluscount = 1;
1408                         } else {
1409                                 /* Time since last non-'+' < 1.5 sec. ? */
1410                                 if ((jiffies - *lastplus) < PLUSWAIT2)
1411                                         *pluscount = 0;
1412                         }
1413                         if ((*pluscount == 3) && (count = 1))
1414                                 isdn_timer_ctrl(ISDN_TIMER_MODEMPLUS, 1);
1415                         if (*pluscount > 3)
1416                                 *pluscount = 1;
1417                 } else
1418                         *pluscount = 0;
1419                 *lastplus = jiffies;
1420                 count--;
1421         }
1422 }
1423 
1424 /*
1425  * Return result of AT-emulator to tty-receive-buffer, depending on
1426  * modem-register 12, bit 0 and 1.
1427  * For CONNECT-messages also switch to online-mode.
1428  * For RING-message handle auto-ATA if register 0 != 0
1429  */
1430 void isdn_tty_modem_result(int code, modem_info * info)
     /*  */
1431 {
1432         atemu *m = &dev->mdm.atmodem[info->line];
1433         static char *msg[] =
1434         {"OK", "CONNECT", "RING", "NO CARRIER", "ERROR",
1435          "CONNECT 64000", "NO DIALTONE", "BUSY", "NO ANSWER",
1436          "RINGING", "NO MSN/EAZ"};
1437         ulong flags;
1438         char s[4];
1439 
1440         switch (code) {
1441         case 2:
1442                 m->mdmreg[1]++; /* RING */
1443                 if (m->mdmreg[1] == m->mdmreg[0]) {
1444                         /* Accept incoming call */
1445                         isdn_ctrl cmd;
1446                         m->mdmreg[1] = 0;
1447                         dev->mdm.msr[info->line] &= ~UART_MSR_RI;
1448                         cmd.driver = info->isdn_driver;
1449                         cmd.arg = info->isdn_channel;
1450                         cmd.command = ISDN_CMD_ACCEPTD;
1451                         dev->drv[info->isdn_driver]->interface->command(&cmd);
1452                 }
1453                 break;
1454         case 3:
1455                 /* NO CARRIER */
1456                 save_flags(flags);
1457                 cli();
1458                 dev->mdm.msr[info->line] &= ~(UART_MSR_DCD | UART_MSR_RI);
1459                 if ((info->flags & ISDN_ASYNC_CLOSING) || (!info->tty)) {
1460                         restore_flags(flags);
1461                         return;
1462                 }
1463                 restore_flags(flags);
1464                 break;
1465         case 1:
1466         case 5:
1467                 dev->mdm.online[info->line] = 1;
1468                 break;
1469         }
1470         if (m->mdmreg[12] & 1) {
1471                 /* Show results */
1472                 isdn_tty_at_cout("\r\n", info);
1473                 if (m->mdmreg[12] & 2) {
1474                         /* Show numeric results */
1475                         sprintf(s, "%d", code);
1476                         isdn_tty_at_cout(s, info);
1477                 } else {
1478                         if (code == 2) {
1479                                 isdn_tty_at_cout("CALLER NUMBER: ", info);
1480                                 isdn_tty_at_cout(dev->num[info->drv_index], info);
1481                                 isdn_tty_at_cout("\r\n", info);
1482                         }
1483                         isdn_tty_at_cout(msg[code], info);
1484                         if (code == 5) {
1485                                 /* Append Protocol to CONNECT message */
1486                                 isdn_tty_at_cout((m->mdmreg[14] != 3) ? "/X.75" : "/HDLC", info);
1487                                 if (m->mdmreg[13] & 2)
1488                                         isdn_tty_at_cout("/T.70", info);
1489                         }
1490                 }
1491                 isdn_tty_at_cout("\r\n", info);
1492         }
1493         if (code == 3) {
1494                 save_flags(flags);
1495                 cli();
1496                 if ((info->flags & ISDN_ASYNC_CLOSING) || (!info->tty)) {
1497                         restore_flags(flags);
1498                         return;
1499                 }
1500                 if ((info->flags & ISDN_ASYNC_CHECK_CD) &&
1501                     (!((info->flags & ISDN_ASYNC_CALLOUT_ACTIVE) &&
1502                        (info->flags & ISDN_ASYNC_CALLOUT_NOHUP))))
1503                         tty_hangup(info->tty);
1504                 restore_flags(flags);
1505         }
1506 }
1507 
1508 /*
1509  * Display a modem-register-value.
1510  */
1511 static void isdn_tty_show_profile(int ridx, modem_info * info)
     /*  */
1512 {
1513         char v[6];
1514 
1515         sprintf(v, "%d\r\n", dev->mdm.atmodem[info->line].mdmreg[ridx]);
1516         isdn_tty_at_cout(v, info);
1517 }
1518 
1519 /*
1520  * Get MSN-string from char-pointer, set pointer to end of number
1521  */
1522 static void isdn_tty_get_msnstr(char *n, char **p)
     /*  */
1523 {
1524         while ((*p[0] >= '0' && *p[0] <= '9') || (*p[0] == ','))
1525                 *n++ = *p[0]++;
1526         *n = '\0';
1527 }
1528 
1529 /*
1530  * Get phone-number from modem-commandbuffer
1531  */
1532 static void isdn_tty_getdial(char *p, char *q)
     /*  */
1533 {
1534         int first = 1;
1535 
1536         while (strchr("0123456789,#.*WPTS-", *p) && *p) {
1537                 if ((*p >= '0' && *p <= '9') || ((*p == 'S') && first))
1538                         *q++ = *p;
1539                 p++;
1540                 first = 0;
1541         }
1542         *q = 0;
1543 }
1544 
1545 /*
1546  * Parse and perform an AT-command-line.
1547  *
1548  * Parameter:
1549  *   channel   index to line (minor-device)
1550  */
1551 static void isdn_tty_parse_at(modem_info * info)
     /*  */
1552 {
1553         atemu *m = &dev->mdm.atmodem[info->line];
1554         char *p;
1555         int mreg;
1556         int mval;
1557         int i;
1558         char rb[100];
1559         char ds[40];
1560         isdn_ctrl cmd;
1561 
1562 #ifdef ISDN_DEBUG_AT
1563         printk(KERN_DEBUG "AT: '%s'\n", m->mdmcmd);
1564 #endif
1565         for (p = &m->mdmcmd[2]; *p;) {
1566                 switch (*p) {
1567                 case 'A':
1568                         /* A - Accept incoming call */
1569                         p++;
1570                         if (m->mdmreg[1]) {
1571 #define FIDOBUG
1572 #ifdef FIDOBUG
1573 /* Variables fido... defined temporarily for finding a strange bug */
1574                                 driver *fido_drv;
1575                                 isdn_if *fido_if;
1576                                 int fido_isdn_driver;
1577                                 modem_info *fido_modem_info;
1578                                 int (*fido_command) (isdn_ctrl *);
1579 #endif
1580                                 /* Accept incoming call */
1581                                 m->mdmreg[1] = 0;
1582                                 dev->mdm.msr[info->line] &= ~UART_MSR_RI;
1583                                 cmd.driver = info->isdn_driver;
1584                                 cmd.command = ISDN_CMD_SETL2;
1585                                 cmd.arg = info->isdn_channel + (m->mdmreg[14] << 8);
1586                                 dev->drv[info->isdn_driver]->interface->command(&cmd);
1587                                 cmd.driver = info->isdn_driver;
1588                                 cmd.command = ISDN_CMD_SETL3;
1589                                 cmd.arg = info->isdn_channel + (m->mdmreg[15] << 8);
1590                                 dev->drv[info->isdn_driver]->interface->command(&cmd);
1591                                 cmd.driver = info->isdn_driver;
1592                                 cmd.arg = info->isdn_channel;
1593                                 cmd.command = ISDN_CMD_ACCEPTD;
1594 #ifdef FIDOBUG
1595                                 fido_modem_info = info;
1596                                 fido_isdn_driver = fido_modem_info->isdn_driver;
1597                                 fido_drv = dev->drv[fido_isdn_driver];
1598                                 fido_if = fido_drv->interface;
1599                                 fido_command = fido_if->command;
1600                                 fido_command(&cmd);
1601 #else
1602                                 dev->drv[info->isdn_driver]->interface->command(&cmd);
1603 #endif
1604                         } else {
1605                                 isdn_tty_modem_result(8, info);
1606                                 return;
1607                         }
1608                         break;
1609                 case 'D':
1610                         /* D - Dial */
1611                         isdn_tty_getdial(++p, ds);
1612                         p += strlen(p);
1613                         if (!strlen(m->msn))
1614                                 isdn_tty_modem_result(10, info);
1615                         else if (strlen(ds))
1616                                 isdn_tty_dial(ds, info, m);
1617                         else
1618                                 isdn_tty_modem_result(4, info);
1619                         return;
1620                 case 'E':
1621                         /* E - Turn Echo on/off */
1622                         p++;
1623                         switch (*p) {
1624                         case '0':
1625                                 p++;
1626                                 m->mdmreg[12] &= ~4;
1627                                 break;
1628                         case '1':
1629                                 p++;
1630                                 m->mdmreg[12] |= 4;
1631                                 break;
1632                         default:
1633                                 isdn_tty_modem_result(4, info);
1634                                 return;
1635                         }
1636                         break;
1637                 case 'H':
1638                         /* H - On/Off-hook */
1639                         p++;
1640                         switch (*p) {
1641                         case '0':
1642                                 p++;
1643                                 isdn_tty_on_hook(info);
1644                                 break;
1645                         case '1':
1646                                 p++;
1647                                 isdn_tty_off_hook();
1648                                 break;
1649                         default:
1650                                 isdn_tty_on_hook(info);
1651                                 break;
1652                         }
1653                         break;
1654                 case 'I':
1655                         /* I - Information */
1656                         p++;
1657                         isdn_tty_at_cout("ISDN for Linux  (c) by Fritz Elfert\r\n", info);
1658                         switch (*p) {
1659                         case '0':
1660                         case '1':
1661                                 p++;
1662                                 break;
1663                         default:
1664                         }
1665                         break;
1666                 case 'O':
1667                         /* O - Go online */
1668                         p++;
1669                         if (dev->mdm.msr[info->line] & UART_MSR_DCD)    /* if B-Channel is up */
1670                                 isdn_tty_modem_result(5, info);
1671                         else
1672                                 isdn_tty_modem_result(3, info);
1673                         return;
1674                 case 'Q':
1675                         /* Q - Turn Emulator messages on/off */
1676                         p++;
1677                         switch (*p) {
1678                         case '0':
1679                                 p++;
1680                                 m->mdmreg[12] |= 1;
1681                                 break;
1682                         case '1':
1683                                 p++;
1684                                 m->mdmreg[12] &= ~1;
1685                                 break;
1686                         default:
1687                                 isdn_tty_modem_result(4, info);
1688                                 return;
1689                         }
1690                         break;
1691                 case 'S':
1692                         /* S - Set/Get Register */
1693                         p++;
1694                         mreg = isdn_getnum(&p);
1695                         if (mreg < 0 || mreg > ISDN_MODEM_ANZREG) {
1696                                 isdn_tty_modem_result(4, info);
1697                                 return;
1698                         }
1699                         switch (*p) {
1700                         case '=':
1701                                 p++;
1702                                 mval = isdn_getnum(&p);
1703                                 if (mval >= 0 && mval <= 255) {
1704                                         if ((mreg == 16) && ((mval * 16) > ISDN_SERIAL_XMIT_SIZE)) {
1705                                                 isdn_tty_modem_result(4, info);
1706                                                 return;
1707                                         }
1708                                         m->mdmreg[mreg] = mval;
1709                                 } else {
1710                                         isdn_tty_modem_result(4, info);
1711                                         return;
1712                                 }
1713                                 break;
1714                         case '?':
1715                                 p++;
1716                                 isdn_tty_show_profile(mreg, info);
1717                                 return;
1718                                 break;
1719                         default:
1720                                 isdn_tty_modem_result(4, info);
1721                                 return;
1722                         }
1723                         break;
1724                 case 'V':
1725                         /* V - Numeric or ASCII Emulator-messages */
1726                         p++;
1727                         switch (*p) {
1728                         case '0':
1729                                 p++;
1730                                 m->mdmreg[12] |= 2;
1731                                 break;
1732                         case '1':
1733                                 p++;
1734                                 m->mdmreg[12] &= ~2;
1735                                 break;
1736                         default:
1737                                 isdn_tty_modem_result(4, info);
1738                                 return;
1739                         }
1740                         break;
1741                 case 'Z':
1742                         /* Z - Load Registers from Profile */
1743                         p++;
1744                         isdn_tty_modem_reset_regs(m, 1);
1745                         break;
1746                 case '+':
1747                         p++;
1748                         switch (*p) {
1749                         case 'F':
1750                                 break;
1751                         }
1752                         break;
1753                 case '&':
1754                         p++;
1755                         switch (*p) {
1756                         case 'B':
1757                                 /* &B - Set Buffersize */
1758                                 p++;
1759                                 i = isdn_getnum(&p);
1760                                 if ((i < 0) || (i > ISDN_SERIAL_XMIT_SIZE)) {
1761                                         isdn_tty_modem_result(4, info);
1762                                         return;
1763                                 }
1764                                 m->mdmreg[16] = i / 16;
1765                                 break;
1766                         case 'D':
1767                                 /* &D - Set DCD-Low-behavior */
1768                                 p++;
1769                                 switch (isdn_getnum(&p)) {
1770                                 case 2:
1771                                         m->mdmreg[12] &= ~32;
1772                                         break;
1773                                 case 3:
1774                                         m->mdmreg[12] |= 32;
1775                                         break;
1776                                 default:
1777                                         isdn_tty_modem_result(4, info);
1778                                         return;
1779                                 }
1780                                 break;
1781                         case 'E':
1782                                 /* &E -Set EAZ/MSN */
1783                                 p++;
1784                                 isdn_tty_get_msnstr(m->msn, &p);
1785                                 break;
1786                         case 'F':
1787                                 /* &F -Set Factory-Defaults */
1788                                 p++;
1789                                 isdn_tty_reset_profile(m);
1790                                 isdn_tty_modem_reset_regs(m, 1);
1791                                 break;
1792                         case 'S':
1793                                 /* &S - Set Windowsize */
1794                                 p++;
1795                                 i = isdn_getnum(&p);
1796                                 if ((i > 0) && (i < 9))
1797                                         m->mdmreg[17] = i;
1798                                 else {
1799                                         isdn_tty_modem_result(4, info);
1800                                         return;
1801                                 }
1802                                 break;
1803                         case 'V':
1804                                 /* &V - Show registers */
1805                                 p++;
1806                                 for (i = 0; i < ISDN_MODEM_ANZREG; i++) {
1807                                         sprintf(rb, "S%d=%d%s", i, m->mdmreg[i], (i == 6) ? "\r\n" : " ");
1808                                         isdn_tty_at_cout(rb, info);
1809                                 }
1810                                 sprintf(rb, "\r\nEAZ/MSN: %s\r\n", strlen(m->msn) ? m->msn : "None");
1811                                 isdn_tty_at_cout(rb, info);
1812                                 break;
1813                         case 'W':
1814                                 /* &W - Write Profile */
1815                                 p++;
1816                                 switch (*p) {
1817                                 case '0':
1818                                         p++;
1819                                         modem_write_profile(m);
1820                                         break;
1821                                 default:
1822                                         isdn_tty_modem_result(4, info);
1823                                         return;
1824                                 }
1825                                 break;
1826                         case 'X':
1827                                 /* &X - Switch to BTX-Mode */
1828                                 p++;
1829                                 switch (*p) {
1830                                 case '0':
1831                                         p++;
1832                                         m->mdmreg[13] &= ~2;
1833                                         break;
1834                                 case '1':
1835                                         p++;
1836                                         m->mdmreg[13] |= 2;
1837                                         m->mdmreg[14] = 0;
1838                                         m->mdmreg[16] = 7;
1839                                         m->mdmreg[18] = 7;
1840                                         m->mdmreg[19] = 0;
1841                                         break;
1842                                 default:
1843                                         isdn_tty_modem_result(4, info);
1844                                         return;
1845                                 }
1846                                 break;
1847                         default:
1848                                 isdn_tty_modem_result(4, info);
1849                                 return;
1850                         }
1851                         break;
1852                 default:
1853                         isdn_tty_modem_result(4, info);
1854                         return;
1855                 }
1856         }
1857         isdn_tty_modem_result(0, info);
1858 }
1859 
1860 /* Need own toupper() because standard-toupper is not available
1861  * within modules.
1862  */
1863 #define my_toupper(c) (((c>='a')&&(c<='z'))?(c&0xdf):c)
1864 
1865 /*
1866  * Perform line-editing of AT-commands
1867  *
1868  * Parameters:
1869  *   p        inputbuffer
1870  *   count    length of buffer
1871  *   channel  index to line (minor-device)
1872  *   user     flag: buffer is in userspace
1873  */
1874 static int isdn_tty_edit_at(const char *p, int count, modem_info * info, int user)
     /*  */
1875 {
1876         atemu *m = &dev->mdm.atmodem[info->line];
1877         int total = 0;
1878         u_char c;
1879         char eb[2];
1880         int cnt;
1881 
1882         for (cnt = count; cnt > 0; p++, cnt--) {
1883                 if (user)
1884                         c = get_fs_byte(p);
1885                 else
1886                         c = *p;
1887                 total++;
1888                 if (c == m->mdmreg[3] || c == m->mdmreg[4]) {
1889                         /* Separator (CR oder LF) */
1890                         m->mdmcmd[m->mdmcmdl] = 0;
1891                         if (m->mdmreg[12] & 4) {
1892                                 eb[0] = c;
1893                                 eb[1] = 0;
1894                                 isdn_tty_at_cout(eb, info);
1895                         }
1896                         if (m->mdmcmdl >= 2)
1897                                 isdn_tty_parse_at(info);
1898                         m->mdmcmdl = 0;
1899                         continue;
1900                 }
1901                 if (c == m->mdmreg[5] && m->mdmreg[5] < 128) {
1902                         /* Backspace-Funktion */
1903                         if ((m->mdmcmdl > 2) || (!m->mdmcmdl)) {
1904                                 if (m->mdmcmdl)
1905                                         m->mdmcmdl--;
1906                                 if (m->mdmreg[12] & 4)
1907                                         isdn_tty_at_cout("\b", info);
1908                         }
1909                         continue;
1910                 }
1911                 if (cmdchar(c)) {
1912                         if (m->mdmreg[12] & 4) {
1913                                 eb[0] = c;
1914                                 eb[1] = 0;
1915                                 isdn_tty_at_cout(eb, info);
1916                         }
1917                         if (m->mdmcmdl < 255) {
1918                                 c = my_toupper(c);
1919                                 switch (m->mdmcmdl) {
1920                                 case 0:
1921                                         if (c == 'A')
1922                                                 m->mdmcmd[m->mdmcmdl++] = c;
1923                                         break;
1924                                 case 1:
1925                                         if (c == 'T')
1926                                                 m->mdmcmd[m->mdmcmdl++] = c;
1927                                         break;
1928                                 default:
1929                                         m->mdmcmd[m->mdmcmdl++] = c;
1930                                 }
1931                         }
1932                 }
1933         }
1934         return total;
1935 }
1936 
1937 /*
1938  * Switch all modem-channels who are online and got a valid
1939  * escape-sequence 1.5 seconds ago, to command-mode.
1940  * This function is called every second via timer-interrupt from within 
1941  * timer-dispatcher isdn_timer_function()
1942  */
1943 void isdn_tty_modem_escape(void)
     /*  */
1944 {
1945         int ton = 0;
1946         int i;
1947         int midx;
1948 
1949         for (i = 0; i < ISDN_MAX_CHANNELS; i++)
1950                 if (USG_MODEM(dev->usage[i]))
1951                         if ((midx = dev->m_idx[i]) >= 0)
1952                                 if (dev->mdm.online[midx]) {
1953                                         ton = 1;
1954                                         if ((dev->mdm.atmodem[midx].pluscount == 3) &&
1955                                             ((jiffies - dev->mdm.atmodem[midx].lastplus) > PLUSWAIT2)) {
1956                                                 dev->mdm.atmodem[midx].pluscount = 0;
1957                                                 dev->mdm.online[midx] = 0;
1958                                                 isdn_tty_modem_result(0, &dev->mdm.info[midx]);
1959                                         }
1960                                 }
1961         isdn_timer_ctrl(ISDN_TIMER_MODEMPLUS, ton);
1962 }
1963 
1964 /*
1965  * Put a RING-message to all modem-channels who have the RI-bit set.
1966  * This function is called every second via timer-interrupt from within 
1967  * timer-dispatcher isdn_timer_function()
1968  */
1969 void isdn_tty_modem_ring(void)
     /*  */
1970 {
1971         int ton = 0;
1972         int i;
1973         int midx;
1974 
1975         for (i = 0; i < ISDN_MAX_CHANNELS; i++)
1976                 if (USG_MODEM(dev->usage[i]))
1977                         if ((midx = dev->m_idx[i]) >= 0)
1978                                 if (dev->mdm.msr[midx] & UART_MSR_RI) {
1979                                         ton = 1;
1980                                         isdn_tty_modem_result(2, &dev->mdm.info[midx]);
1981                                 }
1982         isdn_timer_ctrl(ISDN_TIMER_MODEMRING, ton);
1983 }
1984 
1985 void isdn_tty_modem_xmit(void)
     /*  */
1986 {
1987         int ton = 0;
1988         int i;
1989         int midx;
1990         char *bufptr;
1991         int buflen;
1992 
1993         for (i = 0; i < ISDN_MAX_CHANNELS; i++)
1994                 if (USG_MODEM(dev->usage[i]))
1995                         if ((midx = dev->m_idx[i]) >= 0)
1996                                 if (dev->mdm.online[midx]) {
1997                                         modem_info *info = &(dev->mdm.info[midx]);
1998                                         ulong flags;
1999 
2000                                         save_flags(flags);
2001                                         cli();
2002                                         if (info->xmit_count > 0) {
2003                                                 struct tty_struct *tty = info->tty;
2004                                                 ton = 1;
2005 #if 0
2006                                                 printk(KERN_DEBUG "WB2: %d\n", info->xmit_count);
2007 #endif
2008                                                 bufptr = info->xmit_buf;
2009                                                 buflen = info->xmit_count;
2010                                                 if (dev->mdm.atmodem[midx].mdmreg[13] & 2) {
2011                                                         /* Add T.70 simplyfied header */
2012 #ifdef ISDN_DEBUG_MODEM_DUMP
2013                                                         isdn_dumppkt("T70pack3:", bufptr, buflen, 40);
2014 #endif
2015                                                         bufptr -= 4;
2016                                                         buflen += 4;
2017                                                         memcpy(bufptr, "\1\0\1\0", 4);
2018 #ifdef ISDN_DEBUG_MODEM_DUMP
2019                                                         isdn_dumppkt("T70pack4:", bufptr, buflen, 40);
2020 #endif
2021                                                 }
2022                                                 if (dev->drv[info->isdn_driver]->interface->
2023                                                     writebuf(info->isdn_driver, info->isdn_channel, bufptr, buflen, 0) > 0) {
2024                                                         info->xmit_count = 0;
2025                                                         info->xmit_size = dev->mdm.atmodem[midx].mdmreg[16] * 16;
2026 #if FUTURE
2027                                                         info->send_outstanding++;
2028                                                         dev->mdm.msr[midx] &= ~UART_MSR_CTS;
2029 #endif
2030                                                         if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
2031                                                             tty->ldisc.write_wakeup)
2032                                                                 (tty->ldisc.write_wakeup) (tty);
2033                                                         wake_up_interruptible(&tty->write_wait);
2034                                                 }
2035                                         }
2036                                         restore_flags(flags);
2037                                 }
2038         isdn_timer_ctrl(ISDN_TIMER_MODEMXMIT, ton);
2039 }
2040 
2041 #if FUTURE
2042 /*
2043  * A packet has been output successfully.
2044  * Search the tty-devices for an aproppriate device, decrement it's
2045  * counter for outstanding packets, and set CTS if this counter reaches 0.
2046  */
2047 void isdn_tty_bsent(int drv, int chan)
     /*  */
2048 {
2049         int i;
2050         ulong flags;
2051 
2052         save_flags(flags);
2053         cli();
2054         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
2055                 modem_info *info = &dev->mdm.info[i];
2056                 if ((info->isdn_driver == drv) &&
2057                     (info->isdn_channel == chan) &&
2058                     (info->send_outstanding)) {
2059                         if (!(--info->send_outstanding))
2060                                 dev->mdm.msr[i] |= UART_MSR_CTS;
2061                         restore_flags(flags);
2062                         return;
2063                 }
2064         }
2065         restore_flags(flags);
2066         return;
2067 }
2068 #endif                          /* FUTURE */
/* */
root/drivers/isdn/isdn_tty.c

DEFINITIONS
