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