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Linux/net/irda/ircomm/ircomm_tty_ioctl.c

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  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 
429 

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