net/irda/ircomm/ircomm_tty_ioctl.c

   1 /*********************************************************************
   2  *
   3  * Filename:      ircomm_tty_ioctl.c
   4  * Version:
   5  * Description:
   6  * Status:        Experimental.
   7  * Author:        Dag Brattli <dagb@cs.uit.no>
   8  * Created at:    Thu Jun 10 14:39:09 1999
   9  * Modified at:   Wed Jan  5 14:45:43 2000
  10  * Modified by:   Dag Brattli <dagb@cs.uit.no>
  11  *
  12  *     Copyright (c) 1999-2000 Dag Brattli, All Rights Reserved.
  13  *
  14  *     This program is free software; you can redistribute it and/or
  15  *     modify it under the terms of the GNU General Public License as
  16  *     published by the Free Software Foundation; either version 2 of
  17  *     the License, or (at your option) any later version.
  18  *
  19  *     This program is distributed in the hope that it will be useful,
  20  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  22  *     GNU General Public License for more details.
  23  *
  24  *     You should have received a copy of the GNU General Public License
  25  *     along with this program; if not, write to the Free Software
  26  *     Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  27  *     MA 02111-1307 USA
  28  *
  29  ********************************************************************/
  30
  31 #include <linux/init.h>
  32 #include <linux/fs.h>
  33 #include <linux/termios.h>
  34 #include <linux/tty.h>
  35 #include <linux/serial.h>
  36
  37 #include <asm/uaccess.h>
  38
  39 #include <net/irda/irda.h>
  40 #include <net/irda/irmod.h>
  41
  42 #include <net/irda/ircomm_core.h>
  43 #include <net/irda/ircomm_param.h>
  44 #include <net/irda/ircomm_tty_attach.h>
  45 #include <net/irda/ircomm_tty.h>
  46
  47 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
  48
  49 /*
  50  * Function ircomm_tty_change_speed (driver)
  51  *
  52  *    Change speed of the driver. If the remote device is a DCE, then this
  53  *    should make it change the speed of its serial port
  54  */
  55 static void ircomm_tty_change_speed(struct ircomm_tty_cb *self,
  56                 struct tty_struct *tty)
  57 {
  58         unsigned int cflag, cval;
  59         int baud;
  60
  61         IRDA_DEBUG(2, "%s()\n", __func__ );
  62
  63         if (!self->ircomm)
  64                 return;
  65
  66         cflag = tty->termios.c_cflag;
  67
  68         /*  byte size and parity */
  69         switch (cflag & CSIZE) {
  70         case CS5: cval = IRCOMM_WSIZE_5; break;
  71         case CS6: cval = IRCOMM_WSIZE_6; break;
  72         case CS7: cval = IRCOMM_WSIZE_7; break;
  73         case CS8: cval = IRCOMM_WSIZE_8; break;
  74         default:  cval = IRCOMM_WSIZE_5; break;
  75         }
  76         if (cflag & CSTOPB)
  77                 cval |= IRCOMM_2_STOP_BIT;
  78
  79         if (cflag & PARENB)
  80                 cval |= IRCOMM_PARITY_ENABLE;
  81         if (!(cflag & PARODD))
  82                 cval |= IRCOMM_PARITY_EVEN;
  83
  84         /* Determine divisor based on baud rate */
  85         baud = tty_get_baud_rate(tty);
  86         if (!baud)
  87                 baud = 9600;    /* B0 transition handled in rs_set_termios */
  88
  89         self->settings.data_rate = baud;
  90         ircomm_param_request(self, IRCOMM_DATA_RATE, FALSE);
  91
  92         /* CTS flow control flag and modem status interrupts */
  93         if (cflag & CRTSCTS) {
  94                 self->port.flags |= ASYNC_CTS_FLOW;
  95                 self->settings.flow_control |= IRCOMM_RTS_CTS_IN;
  96                 /* This got me. Bummer. Jean II */
  97                 if (self->service_type == IRCOMM_3_WIRE_RAW)
  98                         IRDA_WARNING("%s(), enabling RTS/CTS on link that doesn't support it (3-wire-raw)\n", __func__);
  99         } else {
 100                 self->port.flags &= ~ASYNC_CTS_FLOW;
 101                 self->settings.flow_control &= ~IRCOMM_RTS_CTS_IN;
 102         }
 103         if (cflag & CLOCAL)
 104                 self->port.flags &= ~ASYNC_CHECK_CD;
 105         else
 106                 self->port.flags |= ASYNC_CHECK_CD;
 107 #if 0
 108         /*
 109          * Set up parity check flag
 110          */
 111
 112         if (I_INPCK(self->tty))
 113                 driver->read_status_mask |= LSR_FE | LSR_PE;
 114         if (I_BRKINT(driver->tty) || I_PARMRK(driver->tty))
 115                 driver->read_status_mask |= LSR_BI;
 116
 117         /*
 118          * Characters to ignore
 119          */
 120         driver->ignore_status_mask = 0;
 121         if (I_IGNPAR(driver->tty))
 122                 driver->ignore_status_mask |= LSR_PE | LSR_FE;
 123
 124         if (I_IGNBRK(self->tty)) {
 125                 self->ignore_status_mask |= LSR_BI;
 126                 /*
 127                  * If we're ignore parity and break indicators, ignore
 128                  * overruns too. (For real raw support).
 129                  */
 130                 if (I_IGNPAR(self->tty))
 131                         self->ignore_status_mask |= LSR_OE;
 132         }
 133 #endif
 134         self->settings.data_format = cval;
 135
 136         ircomm_param_request(self, IRCOMM_DATA_FORMAT, FALSE);
 137         ircomm_param_request(self, IRCOMM_FLOW_CONTROL, TRUE);
 138 }
 139
 140 /*
 141  * Function ircomm_tty_set_termios (tty, old_termios)
 142  *
 143  *    This routine allows the tty driver to be notified when device's
 144  *    termios settings have changed.  Note that a well-designed tty driver
 145  *    should be prepared to accept the case where old == NULL, and try to
 146  *    do something rational.
 147  */
 148 void ircomm_tty_set_termios(struct tty_struct *tty,
 149                             struct ktermios *old_termios)
 150 {
 151         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 152         unsigned int cflag = tty->termios.c_cflag;
 153
 154         IRDA_DEBUG(2, "%s()\n", __func__ );
 155
 156         if ((cflag == old_termios->c_cflag) &&
 157             (RELEVANT_IFLAG(tty->termios.c_iflag) ==
 158              RELEVANT_IFLAG(old_termios->c_iflag)))
 159         {
 160                 return;
 161         }
 162
 163         ircomm_tty_change_speed(self, tty);
 164
 165         /* Handle transition to B0 status */
 166         if ((old_termios->c_cflag & CBAUD) &&
 167             !(cflag & CBAUD)) {
 168                 self->settings.dte &= ~(IRCOMM_DTR|IRCOMM_RTS);
 169                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
 170         }
 171
 172         /* Handle transition away from B0 status */
 173         if (!(old_termios->c_cflag & CBAUD) &&
 174             (cflag & CBAUD)) {
 175                 self->settings.dte |= IRCOMM_DTR;
 176                 if (!(tty->termios.c_cflag & CRTSCTS) ||
 177                     !test_bit(TTY_THROTTLED, &tty->flags)) {
 178                         self->settings.dte |= IRCOMM_RTS;
 179                 }
 180                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
 181         }
 182
 183         /* Handle turning off CRTSCTS */
 184         if ((old_termios->c_cflag & CRTSCTS) &&
 185             !(tty->termios.c_cflag & CRTSCTS))
 186         {
 187                 tty->hw_stopped = 0;
 188                 ircomm_tty_start(tty);
 189         }
 190 }
 191
 192 /*
 193  * Function ircomm_tty_tiocmget (tty)
 194  *
 195  *
 196  *
 197  */
 198 int ircomm_tty_tiocmget(struct tty_struct *tty)
 199 {
 200         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 201         unsigned int result;
 202
 203         IRDA_DEBUG(2, "%s()\n", __func__ );
 204
 205         if (tty->flags & (1 << TTY_IO_ERROR))
 206                 return -EIO;
 207
 208         result =  ((self->settings.dte & IRCOMM_RTS) ? TIOCM_RTS : 0)
 209                 | ((self->settings.dte & IRCOMM_DTR) ? TIOCM_DTR : 0)
 210                 | ((self->settings.dce & IRCOMM_CD)  ? TIOCM_CAR : 0)
 211                 | ((self->settings.dce & IRCOMM_RI)  ? TIOCM_RNG : 0)
 212                 | ((self->settings.dce & IRCOMM_DSR) ? TIOCM_DSR : 0)
 213                 | ((self->settings.dce & IRCOMM_CTS) ? TIOCM_CTS : 0);
 214         return result;
 215 }
 216
 217 /*
 218  * Function ircomm_tty_tiocmset (tty, set, clear)
 219  *
 220  *
 221  *
 222  */
 223 int ircomm_tty_tiocmset(struct tty_struct *tty,
 224                         unsigned int set, unsigned int clear)
 225 {
 226         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 227
 228         IRDA_DEBUG(2, "%s()\n", __func__ );
 229
 230         if (tty->flags & (1 << TTY_IO_ERROR))
 231                 return -EIO;
 232
 233         IRDA_ASSERT(self != NULL, return -1;);
 234         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 235
 236         if (set & TIOCM_RTS)
 237                 self->settings.dte |= IRCOMM_RTS;
 238         if (set & TIOCM_DTR)
 239                 self->settings.dte |= IRCOMM_DTR;
 240
 241         if (clear & TIOCM_RTS)
 242                 self->settings.dte &= ~IRCOMM_RTS;
 243         if (clear & TIOCM_DTR)
 244                 self->settings.dte &= ~IRCOMM_DTR;
 245
 246         if ((set|clear) & TIOCM_RTS)
 247                 self->settings.dte |= IRCOMM_DELTA_RTS;
 248         if ((set|clear) & TIOCM_DTR)
 249                 self->settings.dte |= IRCOMM_DELTA_DTR;
 250
 251         ircomm_param_request(self, IRCOMM_DTE, TRUE);
 252
 253         return 0;
 254 }
 255
 256 /*
 257  * Function get_serial_info (driver, retinfo)
 258  *
 259  *
 260  *
 261  */
 262 static int ircomm_tty_get_serial_info(struct ircomm_tty_cb *self,
 263                                       struct serial_struct __user *retinfo)
 264 {
 265         struct serial_struct info;
 266
 267         if (!retinfo)
 268                 return -EFAULT;
 269
 270         IRDA_DEBUG(2, "%s()\n", __func__ );
 271
 272         memset(&info, 0, sizeof(info));
 273         info.line = self->line;
 274         info.flags = self->port.flags;
 275         info.baud_base = self->settings.data_rate;
 276         info.close_delay = self->port.close_delay;
 277         info.closing_wait = self->port.closing_wait;
 278
 279         /* For compatibility  */
 280         info.type = PORT_16550A;
 281         info.port = 0;
 282         info.irq = 0;
 283         info.xmit_fifo_size = 0;
 284         info.hub6 = 0;
 285         info.custom_divisor = 0;
 286
 287         if (copy_to_user(retinfo, &info, sizeof(*retinfo)))
 288                 return -EFAULT;
 289
 290         return 0;
 291 }
 292
 293 /*
 294  * Function set_serial_info (driver, new_info)
 295  *
 296  *
 297  *
 298  */
 299 static int ircomm_tty_set_serial_info(struct ircomm_tty_cb *self,
 300                                       struct serial_struct __user *new_info)
 301 {
 302 #if 0
 303         struct serial_struct new_serial;
 304         struct ircomm_tty_cb old_state, *state;
 305
 306         IRDA_DEBUG(0, "%s()\n", __func__ );
 307
 308         if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
 309                 return -EFAULT;
 310
 311
 312         state = self
 313         old_state = *self;
 314
 315         if (!capable(CAP_SYS_ADMIN)) {
 316                 if ((new_serial.baud_base != state->settings.data_rate) ||
 317                     (new_serial.close_delay != state->close_delay) ||
 318                     ((new_serial.flags & ~ASYNC_USR_MASK) !=
 319                      (self->flags & ~ASYNC_USR_MASK)))
 320                         return -EPERM;
 321                 state->flags = ((state->flags & ~ASYNC_USR_MASK) |
 322                                  (new_serial.flags & ASYNC_USR_MASK));
 323                 self->flags = ((self->flags & ~ASYNC_USR_MASK) |
 324                                (new_serial.flags & ASYNC_USR_MASK));
 325                 /* self->custom_divisor = new_serial.custom_divisor; */
 326                 goto check_and_exit;
 327         }
 328
 329         /*
 330          * OK, past this point, all the error checking has been done.
 331          * At this point, we start making changes.....
 332          */
 333
 334         if (self->settings.data_rate != new_serial.baud_base) {
 335                 self->settings.data_rate = new_serial.baud_base;
 336                 ircomm_param_request(self, IRCOMM_DATA_RATE, TRUE);
 337         }
 338
 339         self->close_delay = new_serial.close_delay * HZ/100;
 340         self->closing_wait = new_serial.closing_wait * HZ/100;
 341         /* self->custom_divisor = new_serial.custom_divisor; */
 342
 343         self->flags = ((self->flags & ~ASYNC_FLAGS) |
 344                        (new_serial.flags & ASYNC_FLAGS));
 345         self->tty->low_latency = (self->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 346
 347  check_and_exit:
 348
 349         if (self->flags & ASYNC_INITIALIZED) {
 350                 if (((old_state.flags & ASYNC_SPD_MASK) !=
 351                      (self->flags & ASYNC_SPD_MASK)) ||
 352                     (old_driver.custom_divisor != driver->custom_divisor)) {
 353                         if ((driver->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
 354                                 driver->tty->alt_speed = 57600;
 355                         if ((driver->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
 356                                 driver->tty->alt_speed = 115200;
 357                         if ((driver->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
 358                                 driver->tty->alt_speed = 230400;
 359                         if ((driver->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
 360                                 driver->tty->alt_speed = 460800;
 361                         ircomm_tty_change_speed(driver);
 362                 }
 363         }
 364 #endif
 365         return 0;
 366 }
 367
 368 /*
 369  * Function ircomm_tty_ioctl (tty, cmd, arg)
 370  *
 371  *
 372  *
 373  */
 374 int ircomm_tty_ioctl(struct tty_struct *tty,
 375                      unsigned int cmd, unsigned long arg)
 376 {
 377         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 378         int ret = 0;
 379
 380         IRDA_DEBUG(2, "%s()\n", __func__ );
 381
 382         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
 383             (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
 384             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
 385                 if (tty->flags & (1 << TTY_IO_ERROR))
 386                     return -EIO;
 387         }
 388
 389         switch (cmd) {
 390         case TIOCGSERIAL:
 391                 ret = ircomm_tty_get_serial_info(self, (struct serial_struct __user *) arg);
 392                 break;
 393         case TIOCSSERIAL:
 394                 ret = ircomm_tty_set_serial_info(self, (struct serial_struct __user *) arg);
 395                 break;
 396         case TIOCMIWAIT:
 397                 IRDA_DEBUG(0, "(), TIOCMIWAIT, not impl!\n");
 398                 break;
 399
 400         case TIOCGICOUNT:
 401                 IRDA_DEBUG(0, "%s(), TIOCGICOUNT not impl!\n", __func__ );
 402 #if 0
 403                 save_flags(flags); cli();
 404                 cnow = driver->icount;
 405                 restore_flags(flags);
 406                 p_cuser = (struct serial_icounter_struct __user *) arg;
 407                 if (put_user(cnow.cts, &p_cuser->cts) ||
 408                     put_user(cnow.dsr, &p_cuser->dsr) ||
 409                     put_user(cnow.rng, &p_cuser->rng) ||
 410                     put_user(cnow.dcd, &p_cuser->dcd) ||
 411                     put_user(cnow.rx, &p_cuser->rx) ||
 412                     put_user(cnow.tx, &p_cuser->tx) ||
 413                     put_user(cnow.frame, &p_cuser->frame) ||
 414                     put_user(cnow.overrun, &p_cuser->overrun) ||
 415                     put_user(cnow.parity, &p_cuser->parity) ||
 416                     put_user(cnow.brk, &p_cuser->brk) ||
 417                     put_user(cnow.buf_overrun, &p_cuser->buf_overrun))
 418                         return -EFAULT;
 419 #endif
 420                 return 0;
 421         default:
 422                 ret = -ENOIOCTLCMD;  /* ioctls which we must ignore */
 423         }
 424         return ret;
 425 }
 426
 427
 428