LXR linux/net/irda/ircomm/ircomm_tty

   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 <asm/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 */
  53static 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 */
 141void 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 */
 184int 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 */
 207int 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 */
 244static 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 */
 271static 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 */
 344int 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
 397