~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/net/irda/ircomm/ircomm_tty.c

Version: ~ [ linux-5.11-rc3 ] ~ [ linux-5.10.7 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.89 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.167 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.215 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.251 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.251 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*********************************************************************
  2  *
  3  * Filename:      ircomm_tty.c
  4  * Version:       1.0
  5  * Description:   IrCOMM serial TTY driver
  6  * Status:        Experimental.
  7  * Author:        Dag Brattli <dagb@cs.uit.no>
  8  * Created at:    Sun Jun  6 21:00:56 1999
  9  * Modified at:   Wed Feb 23 00:09:02 2000
 10  * Modified by:   Dag Brattli <dagb@cs.uit.no>
 11  * Sources:       serial.c and previous IrCOMM work by Takahide Higuchi
 12  *
 13  *     Copyright (c) 1999-2000 Dag Brattli, All Rights Reserved.
 14  *     Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com>
 15  *
 16  *     This program is free software; you can redistribute it and/or
 17  *     modify it under the terms of the GNU General Public License as
 18  *     published by the Free Software Foundation; either version 2 of
 19  *     the License, or (at your option) any later version.
 20  *
 21  *     This program is distributed in the hope that it will be useful,
 22  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 23  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 24  *     GNU General Public License for more details.
 25  *
 26  *     You should have received a copy of the GNU General Public License
 27  *     along with this program; if not, write to the Free Software
 28  *     Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 29  *     MA 02111-1307 USA
 30  *
 31  ********************************************************************/
 32 
 33 #include <linux/init.h>
 34 #include <linux/module.h>
 35 #include <linux/fs.h>
 36 #include <linux/slab.h>
 37 #include <linux/sched.h>
 38 #include <linux/seq_file.h>
 39 #include <linux/termios.h>
 40 #include <linux/tty.h>
 41 #include <linux/tty_flip.h>
 42 #include <linux/interrupt.h>
 43 #include <linux/device.h>               /* for MODULE_ALIAS_CHARDEV_MAJOR */
 44 
 45 #include <asm/uaccess.h>
 46 
 47 #include <net/irda/irda.h>
 48 #include <net/irda/irmod.h>
 49 
 50 #include <net/irda/ircomm_core.h>
 51 #include <net/irda/ircomm_param.h>
 52 #include <net/irda/ircomm_tty_attach.h>
 53 #include <net/irda/ircomm_tty.h>
 54 
 55 static int ircomm_tty_install(struct tty_driver *driver,
 56                 struct tty_struct *tty);
 57 static int  ircomm_tty_open(struct tty_struct *tty, struct file *filp);
 58 static void ircomm_tty_close(struct tty_struct * tty, struct file *filp);
 59 static int  ircomm_tty_write(struct tty_struct * tty,
 60                              const unsigned char *buf, int count);
 61 static int  ircomm_tty_write_room(struct tty_struct *tty);
 62 static void ircomm_tty_throttle(struct tty_struct *tty);
 63 static void ircomm_tty_unthrottle(struct tty_struct *tty);
 64 static int  ircomm_tty_chars_in_buffer(struct tty_struct *tty);
 65 static void ircomm_tty_flush_buffer(struct tty_struct *tty);
 66 static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch);
 67 static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout);
 68 static void ircomm_tty_hangup(struct tty_struct *tty);
 69 static void ircomm_tty_do_softint(struct work_struct *work);
 70 static void ircomm_tty_shutdown(struct ircomm_tty_cb *self);
 71 static void ircomm_tty_stop(struct tty_struct *tty);
 72 
 73 static int ircomm_tty_data_indication(void *instance, void *sap,
 74                                       struct sk_buff *skb);
 75 static int ircomm_tty_control_indication(void *instance, void *sap,
 76                                          struct sk_buff *skb);
 77 static void ircomm_tty_flow_indication(void *instance, void *sap,
 78                                        LOCAL_FLOW cmd);
 79 #ifdef CONFIG_PROC_FS
 80 static const struct file_operations ircomm_tty_proc_fops;
 81 #endif /* CONFIG_PROC_FS */
 82 static struct tty_driver *driver;
 83 
 84 static hashbin_t *ircomm_tty = NULL;
 85 
 86 static const struct tty_operations ops = {
 87         .install         = ircomm_tty_install,
 88         .open            = ircomm_tty_open,
 89         .close           = ircomm_tty_close,
 90         .write           = ircomm_tty_write,
 91         .write_room      = ircomm_tty_write_room,
 92         .chars_in_buffer = ircomm_tty_chars_in_buffer,
 93         .flush_buffer    = ircomm_tty_flush_buffer,
 94         .ioctl           = ircomm_tty_ioctl,    /* ircomm_tty_ioctl.c */
 95         .tiocmget        = ircomm_tty_tiocmget, /* ircomm_tty_ioctl.c */
 96         .tiocmset        = ircomm_tty_tiocmset, /* ircomm_tty_ioctl.c */
 97         .throttle        = ircomm_tty_throttle,
 98         .unthrottle      = ircomm_tty_unthrottle,
 99         .send_xchar      = ircomm_tty_send_xchar,
100         .set_termios     = ircomm_tty_set_termios,
101         .stop            = ircomm_tty_stop,
102         .start           = ircomm_tty_start,
103         .hangup          = ircomm_tty_hangup,
104         .wait_until_sent = ircomm_tty_wait_until_sent,
105 #ifdef CONFIG_PROC_FS
106         .proc_fops       = &ircomm_tty_proc_fops,
107 #endif /* CONFIG_PROC_FS */
108 };
109 
110 static void ircomm_port_raise_dtr_rts(struct tty_port *port, int raise)
111 {
112         struct ircomm_tty_cb *self = container_of(port, struct ircomm_tty_cb,
113                         port);
114         /*
115          * Here, we use to lock those two guys, but as ircomm_param_request()
116          * does it itself, I don't see the point (and I see the deadlock).
117          * Jean II
118          */
119         if (raise)
120                 self->settings.dte |= IRCOMM_RTS | IRCOMM_DTR;
121         else
122                 self->settings.dte &= ~(IRCOMM_RTS | IRCOMM_DTR);
123 
124         ircomm_param_request(self, IRCOMM_DTE, TRUE);
125 }
126 
127 static int ircomm_port_carrier_raised(struct tty_port *port)
128 {
129         struct ircomm_tty_cb *self = container_of(port, struct ircomm_tty_cb,
130                         port);
131         return self->settings.dce & IRCOMM_CD;
132 }
133 
134 static const struct tty_port_operations ircomm_port_ops = {
135         .dtr_rts = ircomm_port_raise_dtr_rts,
136         .carrier_raised = ircomm_port_carrier_raised,
137 };
138 
139 /*
140  * Function ircomm_tty_init()
141  *
142  *    Init IrCOMM TTY layer/driver
143  *
144  */
145 static int __init ircomm_tty_init(void)
146 {
147         driver = alloc_tty_driver(IRCOMM_TTY_PORTS);
148         if (!driver)
149                 return -ENOMEM;
150         ircomm_tty = hashbin_new(HB_LOCK);
151         if (ircomm_tty == NULL) {
152                 IRDA_ERROR("%s(), can't allocate hashbin!\n", __func__);
153                 put_tty_driver(driver);
154                 return -ENOMEM;
155         }
156 
157         driver->driver_name     = "ircomm";
158         driver->name            = "ircomm";
159         driver->major           = IRCOMM_TTY_MAJOR;
160         driver->minor_start     = IRCOMM_TTY_MINOR;
161         driver->type            = TTY_DRIVER_TYPE_SERIAL;
162         driver->subtype         = SERIAL_TYPE_NORMAL;
163         driver->init_termios    = tty_std_termios;
164         driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
165         driver->flags           = TTY_DRIVER_REAL_RAW;
166         tty_set_operations(driver, &ops);
167         if (tty_register_driver(driver)) {
168                 IRDA_ERROR("%s(): Couldn't register serial driver\n",
169                            __func__);
170                 put_tty_driver(driver);
171                 return -1;
172         }
173         return 0;
174 }
175 
176 static void __exit __ircomm_tty_cleanup(struct ircomm_tty_cb *self)
177 {
178         IRDA_DEBUG(0, "%s()\n", __func__ );
179 
180         IRDA_ASSERT(self != NULL, return;);
181         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
182 
183         ircomm_tty_shutdown(self);
184 
185         self->magic = 0;
186         tty_port_destroy(&self->port);
187         kfree(self);
188 }
189 
190 /*
191  * Function ircomm_tty_cleanup ()
192  *
193  *    Remove IrCOMM TTY layer/driver
194  *
195  */
196 static void __exit ircomm_tty_cleanup(void)
197 {
198         int ret;
199 
200         IRDA_DEBUG(4, "%s()\n", __func__ );
201 
202         ret = tty_unregister_driver(driver);
203         if (ret) {
204                 IRDA_ERROR("%s(), failed to unregister driver\n",
205                            __func__);
206                 return;
207         }
208 
209         hashbin_delete(ircomm_tty, (FREE_FUNC) __ircomm_tty_cleanup);
210         put_tty_driver(driver);
211 }
212 
213 /*
214  * Function ircomm_startup (self)
215  *
216  *
217  *
218  */
219 static int ircomm_tty_startup(struct ircomm_tty_cb *self)
220 {
221         notify_t notify;
222         int ret = -ENODEV;
223 
224         IRDA_DEBUG(2, "%s()\n", __func__ );
225 
226         IRDA_ASSERT(self != NULL, return -1;);
227         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
228 
229         /* Check if already open */
230         if (test_and_set_bit(ASYNCB_INITIALIZED, &self->port.flags)) {
231                 IRDA_DEBUG(2, "%s(), already open so break out!\n", __func__ );
232                 return 0;
233         }
234 
235         /* Register with IrCOMM */
236         irda_notify_init(&notify);
237         /* These callbacks we must handle ourselves */
238         notify.data_indication       = ircomm_tty_data_indication;
239         notify.udata_indication      = ircomm_tty_control_indication;
240         notify.flow_indication       = ircomm_tty_flow_indication;
241 
242         /* Use the ircomm_tty interface for these ones */
243         notify.disconnect_indication = ircomm_tty_disconnect_indication;
244         notify.connect_confirm       = ircomm_tty_connect_confirm;
245         notify.connect_indication    = ircomm_tty_connect_indication;
246         strlcpy(notify.name, "ircomm_tty", sizeof(notify.name));
247         notify.instance = self;
248 
249         if (!self->ircomm) {
250                 self->ircomm = ircomm_open(&notify, self->service_type,
251                                            self->line);
252         }
253         if (!self->ircomm)
254                 goto err;
255 
256         self->slsap_sel = self->ircomm->slsap_sel;
257 
258         /* Connect IrCOMM link with remote device */
259         ret = ircomm_tty_attach_cable(self);
260         if (ret < 0) {
261                 IRDA_ERROR("%s(), error attaching cable!\n", __func__);
262                 goto err;
263         }
264 
265         return 0;
266 err:
267         clear_bit(ASYNCB_INITIALIZED, &self->port.flags);
268         return ret;
269 }
270 
271 /*
272  * Function ircomm_block_til_ready (self, filp)
273  *
274  *
275  *
276  */
277 static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self,
278                 struct tty_struct *tty, struct file *filp)
279 {
280         struct tty_port *port = &self->port;
281         DECLARE_WAITQUEUE(wait, current);
282         int             retval;
283         int             do_clocal = 0;
284         unsigned long   flags;
285 
286         IRDA_DEBUG(2, "%s()\n", __func__ );
287 
288         /*
289          * If non-blocking mode is set, or the port is not enabled,
290          * then make the check up front and then exit.
291          */
292         if (test_bit(TTY_IO_ERROR, &tty->flags)) {
293                 port->flags |= ASYNC_NORMAL_ACTIVE;
294                 return 0;
295         }
296 
297         if (filp->f_flags & O_NONBLOCK) {
298                 /* nonblock mode is set */
299                 if (tty->termios.c_cflag & CBAUD)
300                         tty_port_raise_dtr_rts(port);
301                 port->flags |= ASYNC_NORMAL_ACTIVE;
302                 IRDA_DEBUG(1, "%s(), O_NONBLOCK requested!\n", __func__ );
303                 return 0;
304         }
305 
306         if (tty->termios.c_cflag & CLOCAL) {
307                 IRDA_DEBUG(1, "%s(), doing CLOCAL!\n", __func__ );
308                 do_clocal = 1;
309         }
310 
311         /* Wait for carrier detect and the line to become
312          * free (i.e., not in use by the callout).  While we are in
313          * this loop, port->count is dropped by one, so that
314          * mgsl_close() knows when to free things.  We restore it upon
315          * exit, either normal or abnormal.
316          */
317 
318         retval = 0;
319         add_wait_queue(&port->open_wait, &wait);
320 
321         IRDA_DEBUG(2, "%s(%d):block_til_ready before block on %s open_count=%d\n",
322               __FILE__, __LINE__, tty->driver->name, port->count);
323 
324         spin_lock_irqsave(&port->lock, flags);
325         if (!tty_hung_up_p(filp))
326                 port->count--;
327         port->blocked_open++;
328         spin_unlock_irqrestore(&port->lock, flags);
329 
330         while (1) {
331                 if (C_BAUD(tty) && test_bit(ASYNCB_INITIALIZED, &port->flags))
332                         tty_port_raise_dtr_rts(port);
333 
334                 set_current_state(TASK_INTERRUPTIBLE);
335 
336                 if (tty_hung_up_p(filp) ||
337                     !test_bit(ASYNCB_INITIALIZED, &port->flags)) {
338                         retval = (port->flags & ASYNC_HUP_NOTIFY) ?
339                                         -EAGAIN : -ERESTARTSYS;
340                         break;
341                 }
342 
343                 /*
344                  * Check if link is ready now. Even if CLOCAL is
345                  * specified, we cannot return before the IrCOMM link is
346                  * ready
347                  */
348                 if (!test_bit(ASYNCB_CLOSING, &port->flags) &&
349                     (do_clocal || tty_port_carrier_raised(port)) &&
350                     self->state == IRCOMM_TTY_READY)
351                 {
352                         break;
353                 }
354 
355                 if (signal_pending(current)) {
356                         retval = -ERESTARTSYS;
357                         break;
358                 }
359 
360                 IRDA_DEBUG(1, "%s(%d):block_til_ready blocking on %s open_count=%d\n",
361                       __FILE__, __LINE__, tty->driver->name, port->count);
362 
363                 schedule();
364         }
365 
366         __set_current_state(TASK_RUNNING);
367         remove_wait_queue(&port->open_wait, &wait);
368 
369         spin_lock_irqsave(&port->lock, flags);
370         if (!tty_hung_up_p(filp))
371                 port->count++;
372         port->blocked_open--;
373         spin_unlock_irqrestore(&port->lock, flags);
374 
375         IRDA_DEBUG(1, "%s(%d):block_til_ready after blocking on %s open_count=%d\n",
376               __FILE__, __LINE__, tty->driver->name, port->count);
377 
378         if (!retval)
379                 port->flags |= ASYNC_NORMAL_ACTIVE;
380 
381         return retval;
382 }
383 
384 
385 static int ircomm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
386 {
387         struct ircomm_tty_cb *self;
388         unsigned int line = tty->index;
389 
390         /* Check if instance already exists */
391         self = hashbin_lock_find(ircomm_tty, line, NULL);
392         if (!self) {
393                 /* No, so make new instance */
394                 self = kzalloc(sizeof(struct ircomm_tty_cb), GFP_KERNEL);
395                 if (self == NULL) {
396                         IRDA_ERROR("%s(), kmalloc failed!\n", __func__);
397                         return -ENOMEM;
398                 }
399 
400                 tty_port_init(&self->port);
401                 self->port.ops = &ircomm_port_ops;
402                 self->magic = IRCOMM_TTY_MAGIC;
403                 self->flow = FLOW_STOP;
404 
405                 self->line = line;
406                 INIT_WORK(&self->tqueue, ircomm_tty_do_softint);
407                 self->max_header_size = IRCOMM_TTY_HDR_UNINITIALISED;
408                 self->max_data_size = IRCOMM_TTY_DATA_UNINITIALISED;
409 
410                 /* Init some important stuff */
411                 init_timer(&self->watchdog_timer);
412                 spin_lock_init(&self->spinlock);
413 
414                 /*
415                  * Force TTY into raw mode by default which is usually what
416                  * we want for IrCOMM and IrLPT. This way applications will
417                  * not have to twiddle with printcap etc.
418                  *
419                  * Note this is completely usafe and doesn't work properly
420                  */
421                 tty->termios.c_iflag = 0;
422                 tty->termios.c_oflag = 0;
423 
424                 /* Insert into hash */
425                 hashbin_insert(ircomm_tty, (irda_queue_t *) self, line, NULL);
426         }
427 
428         tty->driver_data = self;
429 
430         return tty_port_install(&self->port, driver, tty);
431 }
432 
433 /*
434  * Function ircomm_tty_open (tty, filp)
435  *
436  *    This routine is called when a particular tty device is opened. This
437  *    routine is mandatory; if this routine is not filled in, the attempted
438  *    open will fail with ENODEV.
439  */
440 static int ircomm_tty_open(struct tty_struct *tty, struct file *filp)
441 {
442         struct ircomm_tty_cb *self = tty->driver_data;
443         unsigned long   flags;
444         int ret;
445 
446         IRDA_DEBUG(2, "%s()\n", __func__ );
447 
448         /* ++ is not atomic, so this should be protected - Jean II */
449         spin_lock_irqsave(&self->port.lock, flags);
450         self->port.count++;
451         spin_unlock_irqrestore(&self->port.lock, flags);
452         tty_port_tty_set(&self->port, tty);
453 
454         IRDA_DEBUG(1, "%s(), %s%d, count = %d\n", __func__ , tty->driver->name,
455                    self->line, self->port.count);
456 
457         /* Not really used by us, but lets do it anyway */
458         self->port.low_latency = (self->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
459 
460         /*
461          * If the port is the middle of closing, bail out now
462          */
463         if (tty_hung_up_p(filp) ||
464             test_bit(ASYNCB_CLOSING, &self->port.flags)) {
465 
466                 /* Hm, why are we blocking on ASYNC_CLOSING if we
467                  * do return -EAGAIN/-ERESTARTSYS below anyway?
468                  * IMHO it's either not needed in the first place
469                  * or for some reason we need to make sure the async
470                  * closing has been finished - if so, wouldn't we
471                  * probably better sleep uninterruptible?
472                  */
473 
474                 if (wait_event_interruptible(self->port.close_wait,
475                                 !test_bit(ASYNCB_CLOSING, &self->port.flags))) {
476                         IRDA_WARNING("%s - got signal while blocking on ASYNC_CLOSING!\n",
477                                      __func__);
478                         return -ERESTARTSYS;
479                 }
480 
481 #ifdef SERIAL_DO_RESTART
482                 return (self->port.flags & ASYNC_HUP_NOTIFY) ?
483                         -EAGAIN : -ERESTARTSYS;
484 #else
485                 return -EAGAIN;
486 #endif
487         }
488 
489         /* Check if this is a "normal" ircomm device, or an irlpt device */
490         if (self->line < 0x10) {
491                 self->service_type = IRCOMM_3_WIRE | IRCOMM_9_WIRE;
492                 self->settings.service_type = IRCOMM_9_WIRE; /* 9 wire as default */
493                 /* Jan Kiszka -> add DSR/RI -> Conform to IrCOMM spec */
494                 self->settings.dce = IRCOMM_CTS | IRCOMM_CD | IRCOMM_DSR | IRCOMM_RI; /* Default line settings */
495                 IRDA_DEBUG(2, "%s(), IrCOMM device\n", __func__ );
496         } else {
497                 IRDA_DEBUG(2, "%s(), IrLPT device\n", __func__ );
498                 self->service_type = IRCOMM_3_WIRE_RAW;
499                 self->settings.service_type = IRCOMM_3_WIRE_RAW; /* Default */
500         }
501 
502         ret = ircomm_tty_startup(self);
503         if (ret)
504                 return ret;
505 
506         ret = ircomm_tty_block_til_ready(self, tty, filp);
507         if (ret) {
508                 IRDA_DEBUG(2,
509                       "%s(), returning after block_til_ready with %d\n", __func__ ,
510                       ret);
511 
512                 return ret;
513         }
514         return 0;
515 }
516 
517 /*
518  * Function ircomm_tty_close (tty, filp)
519  *
520  *    This routine is called when a particular tty device is closed.
521  *
522  */
523 static void ircomm_tty_close(struct tty_struct *tty, struct file *filp)
524 {
525         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
526         struct tty_port *port = &self->port;
527 
528         IRDA_DEBUG(0, "%s()\n", __func__ );
529 
530         IRDA_ASSERT(self != NULL, return;);
531         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
532 
533         if (tty_port_close_start(port, tty, filp) == 0)
534                 return;
535 
536         ircomm_tty_shutdown(self);
537 
538         tty_driver_flush_buffer(tty);
539 
540         tty_port_close_end(port, tty);
541         tty_port_tty_set(port, NULL);
542 }
543 
544 /*
545  * Function ircomm_tty_flush_buffer (tty)
546  *
547  *
548  *
549  */
550 static void ircomm_tty_flush_buffer(struct tty_struct *tty)
551 {
552         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
553 
554         IRDA_ASSERT(self != NULL, return;);
555         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
556 
557         /*
558          * Let do_softint() do this to avoid race condition with
559          * do_softint() ;-)
560          */
561         schedule_work(&self->tqueue);
562 }
563 
564 /*
565  * Function ircomm_tty_do_softint (work)
566  *
567  *    We use this routine to give the write wakeup to the user at at a
568  *    safe time (as fast as possible after write have completed). This
569  *    can be compared to the Tx interrupt.
570  */
571 static void ircomm_tty_do_softint(struct work_struct *work)
572 {
573         struct ircomm_tty_cb *self =
574                 container_of(work, struct ircomm_tty_cb, tqueue);
575         struct tty_struct *tty;
576         unsigned long flags;
577         struct sk_buff *skb, *ctrl_skb;
578 
579         IRDA_DEBUG(2, "%s()\n", __func__ );
580 
581         if (!self || self->magic != IRCOMM_TTY_MAGIC)
582                 return;
583 
584         tty = tty_port_tty_get(&self->port);
585         if (!tty)
586                 return;
587 
588         /* Unlink control buffer */
589         spin_lock_irqsave(&self->spinlock, flags);
590 
591         ctrl_skb = self->ctrl_skb;
592         self->ctrl_skb = NULL;
593 
594         spin_unlock_irqrestore(&self->spinlock, flags);
595 
596         /* Flush control buffer if any */
597         if(ctrl_skb) {
598                 if(self->flow == FLOW_START)
599                         ircomm_control_request(self->ircomm, ctrl_skb);
600                 /* Drop reference count - see ircomm_ttp_data_request(). */
601                 dev_kfree_skb(ctrl_skb);
602         }
603 
604         if (tty->hw_stopped)
605                 goto put;
606 
607         /* Unlink transmit buffer */
608         spin_lock_irqsave(&self->spinlock, flags);
609 
610         skb = self->tx_skb;
611         self->tx_skb = NULL;
612 
613         spin_unlock_irqrestore(&self->spinlock, flags);
614 
615         /* Flush transmit buffer if any */
616         if (skb) {
617                 ircomm_tty_do_event(self, IRCOMM_TTY_DATA_REQUEST, skb, NULL);
618                 /* Drop reference count - see ircomm_ttp_data_request(). */
619                 dev_kfree_skb(skb);
620         }
621 
622         /* Check if user (still) wants to be waken up */
623         tty_wakeup(tty);
624 put:
625         tty_kref_put(tty);
626 }
627 
628 /*
629  * Function ircomm_tty_write (tty, buf, count)
630  *
631  *    This routine is called by the kernel to write a series of characters
632  *    to the tty device. The characters may come from user space or kernel
633  *    space. This routine will return the number of characters actually
634  *    accepted for writing. This routine is mandatory.
635  */
636 static int ircomm_tty_write(struct tty_struct *tty,
637                             const unsigned char *buf, int count)
638 {
639         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
640         unsigned long flags;
641         struct sk_buff *skb;
642         int tailroom = 0;
643         int len = 0;
644         int size;
645 
646         IRDA_DEBUG(2, "%s(), count=%d, hw_stopped=%d\n", __func__ , count,
647                    tty->hw_stopped);
648 
649         IRDA_ASSERT(self != NULL, return -1;);
650         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
651 
652         /* We may receive packets from the TTY even before we have finished
653          * our setup. Not cool.
654          * The problem is that we don't know the final header and data size
655          * to create the proper skb, so any skb we would create would have
656          * bogus header and data size, so need care.
657          * We use a bogus header size to safely detect this condition.
658          * Another problem is that hw_stopped was set to 0 way before it
659          * should be, so we would drop this skb. It should now be fixed.
660          * One option is to not accept data until we are properly setup.
661          * But, I suspect that when it happens, the ppp line discipline
662          * just "drops" the data, which might screw up connect scripts.
663          * The second option is to create a "safe skb", with large header
664          * and small size (see ircomm_tty_open() for values).
665          * We just need to make sure that when the real values get filled,
666          * we don't mess up the original "safe skb" (see tx_data_size).
667          * Jean II */
668         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) {
669                 IRDA_DEBUG(1, "%s() : not initialised\n", __func__);
670 #ifdef IRCOMM_NO_TX_BEFORE_INIT
671                 /* We didn't consume anything, TTY will retry */
672                 return 0;
673 #endif
674         }
675 
676         if (count < 1)
677                 return 0;
678 
679         /* Protect our manipulation of self->tx_skb and related */
680         spin_lock_irqsave(&self->spinlock, flags);
681 
682         /* Fetch current transmit buffer */
683         skb = self->tx_skb;
684 
685         /*
686          * Send out all the data we get, possibly as multiple fragmented
687          * frames, but this will only happen if the data is larger than the
688          * max data size. The normal case however is just the opposite, and
689          * this function may be called multiple times, and will then actually
690          * defragment the data and send it out as one packet as soon as
691          * possible, but at a safer point in time
692          */
693         while (count) {
694                 size = count;
695 
696                 /* Adjust data size to the max data size */
697                 if (size > self->max_data_size)
698                         size = self->max_data_size;
699 
700                 /*
701                  * Do we already have a buffer ready for transmit, or do
702                  * we need to allocate a new frame
703                  */
704                 if (skb) {
705                         /*
706                          * Any room for more data at the end of the current
707                          * transmit buffer? Cannot use skb_tailroom, since
708                          * dev_alloc_skb gives us a larger skb than we
709                          * requested
710                          * Note : use tx_data_size, because max_data_size
711                          * may have changed and we don't want to overwrite
712                          * the skb. - Jean II
713                          */
714                         if ((tailroom = (self->tx_data_size - skb->len)) > 0) {
715                                 /* Adjust data to tailroom */
716                                 if (size > tailroom)
717                                         size = tailroom;
718                         } else {
719                                 /*
720                                  * Current transmit frame is full, so break
721                                  * out, so we can send it as soon as possible
722                                  */
723                                 break;
724                         }
725                 } else {
726                         /* Prepare a full sized frame */
727                         skb = alloc_skb(self->max_data_size+
728                                         self->max_header_size,
729                                         GFP_ATOMIC);
730                         if (!skb) {
731                                 spin_unlock_irqrestore(&self->spinlock, flags);
732                                 return -ENOBUFS;
733                         }
734                         skb_reserve(skb, self->max_header_size);
735                         self->tx_skb = skb;
736                         /* Remember skb size because max_data_size may
737                          * change later on - Jean II */
738                         self->tx_data_size = self->max_data_size;
739                 }
740 
741                 /* Copy data */
742                 memcpy(skb_put(skb,size), buf + len, size);
743 
744                 count -= size;
745                 len += size;
746         }
747 
748         spin_unlock_irqrestore(&self->spinlock, flags);
749 
750         /*
751          * Schedule a new thread which will transmit the frame as soon
752          * as possible, but at a safe point in time. We do this so the
753          * "user" can give us data multiple times, as PPP does (because of
754          * its 256 byte tx buffer). We will then defragment and send out
755          * all this data as one single packet.
756          */
757         schedule_work(&self->tqueue);
758 
759         return len;
760 }
761 
762 /*
763  * Function ircomm_tty_write_room (tty)
764  *
765  *    This routine returns the numbers of characters the tty driver will
766  *    accept for queuing to be written. This number is subject to change as
767  *    output buffers get emptied, or if the output flow control is acted.
768  */
769 static int ircomm_tty_write_room(struct tty_struct *tty)
770 {
771         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
772         unsigned long flags;
773         int ret;
774 
775         IRDA_ASSERT(self != NULL, return -1;);
776         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
777 
778 #ifdef IRCOMM_NO_TX_BEFORE_INIT
779         /* max_header_size tells us if the channel is initialised or not. */
780         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED)
781                 /* Don't bother us yet */
782                 return 0;
783 #endif
784 
785         /* Check if we are allowed to transmit any data.
786          * hw_stopped is the regular flow control.
787          * Jean II */
788         if (tty->hw_stopped)
789                 ret = 0;
790         else {
791                 spin_lock_irqsave(&self->spinlock, flags);
792                 if (self->tx_skb)
793                         ret = self->tx_data_size - self->tx_skb->len;
794                 else
795                         ret = self->max_data_size;
796                 spin_unlock_irqrestore(&self->spinlock, flags);
797         }
798         IRDA_DEBUG(2, "%s(), ret=%d\n", __func__ , ret);
799 
800         return ret;
801 }
802 
803 /*
804  * Function ircomm_tty_wait_until_sent (tty, timeout)
805  *
806  *    This routine waits until the device has written out all of the
807  *    characters in its transmitter FIFO.
808  */
809 static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout)
810 {
811         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
812         unsigned long orig_jiffies, poll_time;
813         unsigned long flags;
814 
815         IRDA_DEBUG(2, "%s()\n", __func__ );
816 
817         IRDA_ASSERT(self != NULL, return;);
818         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
819 
820         orig_jiffies = jiffies;
821 
822         /* Set poll time to 200 ms */
823         poll_time = IRDA_MIN(timeout, msecs_to_jiffies(200));
824 
825         spin_lock_irqsave(&self->spinlock, flags);
826         while (self->tx_skb && self->tx_skb->len) {
827                 spin_unlock_irqrestore(&self->spinlock, flags);
828                 schedule_timeout_interruptible(poll_time);
829                 spin_lock_irqsave(&self->spinlock, flags);
830                 if (signal_pending(current))
831                         break;
832                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
833                         break;
834         }
835         spin_unlock_irqrestore(&self->spinlock, flags);
836         current->state = TASK_RUNNING;
837 }
838 
839 /*
840  * Function ircomm_tty_throttle (tty)
841  *
842  *    This routine notifies the tty driver that input buffers for the line
843  *    discipline are close to full, and it should somehow signal that no
844  *    more characters should be sent to the tty.
845  */
846 static void ircomm_tty_throttle(struct tty_struct *tty)
847 {
848         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
849 
850         IRDA_DEBUG(2, "%s()\n", __func__ );
851 
852         IRDA_ASSERT(self != NULL, return;);
853         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
854 
855         /* Software flow control? */
856         if (I_IXOFF(tty))
857                 ircomm_tty_send_xchar(tty, STOP_CHAR(tty));
858 
859         /* Hardware flow control? */
860         if (tty->termios.c_cflag & CRTSCTS) {
861                 self->settings.dte &= ~IRCOMM_RTS;
862                 self->settings.dte |= IRCOMM_DELTA_RTS;
863 
864                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
865         }
866 
867         ircomm_flow_request(self->ircomm, FLOW_STOP);
868 }
869 
870 /*
871  * Function ircomm_tty_unthrottle (tty)
872  *
873  *    This routine notifies the tty drivers that it should signals that
874  *    characters can now be sent to the tty without fear of overrunning the
875  *    input buffers of the line disciplines.
876  */
877 static void ircomm_tty_unthrottle(struct tty_struct *tty)
878 {
879         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
880 
881         IRDA_DEBUG(2, "%s()\n", __func__ );
882 
883         IRDA_ASSERT(self != NULL, return;);
884         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
885 
886         /* Using software flow control? */
887         if (I_IXOFF(tty)) {
888                 ircomm_tty_send_xchar(tty, START_CHAR(tty));
889         }
890 
891         /* Using hardware flow control? */
892         if (tty->termios.c_cflag & CRTSCTS) {
893                 self->settings.dte |= (IRCOMM_RTS|IRCOMM_DELTA_RTS);
894 
895                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
896                 IRDA_DEBUG(1, "%s(), FLOW_START\n", __func__ );
897         }
898         ircomm_flow_request(self->ircomm, FLOW_START);
899 }
900 
901 /*
902  * Function ircomm_tty_chars_in_buffer (tty)
903  *
904  *    Indicates if there are any data in the buffer
905  *
906  */
907 static int ircomm_tty_chars_in_buffer(struct tty_struct *tty)
908 {
909         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
910         unsigned long flags;
911         int len = 0;
912 
913         IRDA_ASSERT(self != NULL, return -1;);
914         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
915 
916         spin_lock_irqsave(&self->spinlock, flags);
917 
918         if (self->tx_skb)
919                 len = self->tx_skb->len;
920 
921         spin_unlock_irqrestore(&self->spinlock, flags);
922 
923         return len;
924 }
925 
926 static void ircomm_tty_shutdown(struct ircomm_tty_cb *self)
927 {
928         unsigned long flags;
929 
930         IRDA_ASSERT(self != NULL, return;);
931         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
932 
933         IRDA_DEBUG(0, "%s()\n", __func__ );
934 
935         if (!test_and_clear_bit(ASYNCB_INITIALIZED, &self->port.flags))
936                 return;
937 
938         ircomm_tty_detach_cable(self);
939 
940         spin_lock_irqsave(&self->spinlock, flags);
941 
942         del_timer(&self->watchdog_timer);
943 
944         /* Free parameter buffer */
945         if (self->ctrl_skb) {
946                 dev_kfree_skb(self->ctrl_skb);
947                 self->ctrl_skb = NULL;
948         }
949 
950         /* Free transmit buffer */
951         if (self->tx_skb) {
952                 dev_kfree_skb(self->tx_skb);
953                 self->tx_skb = NULL;
954         }
955 
956         if (self->ircomm) {
957                 ircomm_close(self->ircomm);
958                 self->ircomm = NULL;
959         }
960 
961         spin_unlock_irqrestore(&self->spinlock, flags);
962 }
963 
964 /*
965  * Function ircomm_tty_hangup (tty)
966  *
967  *    This routine notifies the tty driver that it should hangup the tty
968  *    device.
969  *
970  */
971 static void ircomm_tty_hangup(struct tty_struct *tty)
972 {
973         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
974         struct tty_port *port = &self->port;
975         unsigned long   flags;
976 
977         IRDA_DEBUG(0, "%s()\n", __func__ );
978 
979         IRDA_ASSERT(self != NULL, return;);
980         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
981 
982         /* ircomm_tty_flush_buffer(tty); */
983         ircomm_tty_shutdown(self);
984 
985         spin_lock_irqsave(&port->lock, flags);
986         port->flags &= ~ASYNC_NORMAL_ACTIVE;
987         if (port->tty) {
988                 set_bit(TTY_IO_ERROR, &port->tty->flags);
989                 tty_kref_put(port->tty);
990         }
991         port->tty = NULL;
992         port->count = 0;
993         spin_unlock_irqrestore(&port->lock, flags);
994 
995         wake_up_interruptible(&port->open_wait);
996 }
997 
998 /*
999  * Function ircomm_tty_send_xchar (tty, ch)
1000  *
1001  *    This routine is used to send a high-priority XON/XOFF character to
1002  *    the device.
1003  */
1004 static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch)
1005 {
1006         IRDA_DEBUG(0, "%s(), not impl\n", __func__ );
1007 }
1008 
1009 /*
1010  * Function ircomm_tty_start (tty)
1011  *
1012  *    This routine notifies the tty driver that it resume sending
1013  *    characters to the tty device.
1014  */
1015 void ircomm_tty_start(struct tty_struct *tty)
1016 {
1017         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1018 
1019         ircomm_flow_request(self->ircomm, FLOW_START);
1020 }
1021 
1022 /*
1023  * Function ircomm_tty_stop (tty)
1024  *
1025  *     This routine notifies the tty driver that it should stop outputting
1026  *     characters to the tty device.
1027  */
1028 static void ircomm_tty_stop(struct tty_struct *tty)
1029 {
1030         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1031 
1032         IRDA_ASSERT(self != NULL, return;);
1033         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1034 
1035         ircomm_flow_request(self->ircomm, FLOW_STOP);
1036 }
1037 
1038 /*
1039  * Function ircomm_check_modem_status (self)
1040  *
1041  *    Check for any changes in the DCE's line settings. This function should
1042  *    be called whenever the dce parameter settings changes, to update the
1043  *    flow control settings and other things
1044  */
1045 void ircomm_tty_check_modem_status(struct ircomm_tty_cb *self)
1046 {
1047         struct tty_struct *tty;
1048         int status;
1049 
1050         IRDA_DEBUG(0, "%s()\n", __func__ );
1051 
1052         IRDA_ASSERT(self != NULL, return;);
1053         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1054 
1055         tty = tty_port_tty_get(&self->port);
1056 
1057         status = self->settings.dce;
1058 
1059         if (status & IRCOMM_DCE_DELTA_ANY) {
1060                 /*wake_up_interruptible(&self->delta_msr_wait);*/
1061         }
1062         if ((self->port.flags & ASYNC_CHECK_CD) && (status & IRCOMM_DELTA_CD)) {
1063                 IRDA_DEBUG(2,
1064                            "%s(), ircomm%d CD now %s...\n", __func__ , self->line,
1065                            (status & IRCOMM_CD) ? "on" : "off");
1066 
1067                 if (status & IRCOMM_CD) {
1068                         wake_up_interruptible(&self->port.open_wait);
1069                 } else {
1070                         IRDA_DEBUG(2,
1071                                    "%s(), Doing serial hangup..\n", __func__ );
1072                         if (tty)
1073                                 tty_hangup(tty);
1074 
1075                         /* Hangup will remote the tty, so better break out */
1076                         goto put;
1077                 }
1078         }
1079         if (tty && tty_port_cts_enabled(&self->port)) {
1080                 if (tty->hw_stopped) {
1081                         if (status & IRCOMM_CTS) {
1082                                 IRDA_DEBUG(2,
1083                                            "%s(), CTS tx start...\n", __func__ );
1084                                 tty->hw_stopped = 0;
1085 
1086                                 /* Wake up processes blocked on open */
1087                                 wake_up_interruptible(&self->port.open_wait);
1088 
1089                                 schedule_work(&self->tqueue);
1090                                 goto put;
1091                         }
1092                 } else {
1093                         if (!(status & IRCOMM_CTS)) {
1094                                 IRDA_DEBUG(2,
1095                                            "%s(), CTS tx stop...\n", __func__ );
1096                                 tty->hw_stopped = 1;
1097                         }
1098                 }
1099         }
1100 put:
1101         tty_kref_put(tty);
1102 }
1103 
1104 /*
1105  * Function ircomm_tty_data_indication (instance, sap, skb)
1106  *
1107  *    Handle incoming data, and deliver it to the line discipline
1108  *
1109  */
1110 static int ircomm_tty_data_indication(void *instance, void *sap,
1111                                       struct sk_buff *skb)
1112 {
1113         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1114         struct tty_struct *tty;
1115 
1116         IRDA_DEBUG(2, "%s()\n", __func__ );
1117 
1118         IRDA_ASSERT(self != NULL, return -1;);
1119         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1120         IRDA_ASSERT(skb != NULL, return -1;);
1121 
1122         tty = tty_port_tty_get(&self->port);
1123         if (!tty) {
1124                 IRDA_DEBUG(0, "%s(), no tty!\n", __func__ );
1125                 return 0;
1126         }
1127 
1128         /*
1129          * If we receive data when hardware is stopped then something is wrong.
1130          * We try to poll the peers line settings to check if we are up todate.
1131          * Devices like WinCE can do this, and since they don't send any
1132          * params, we can just as well declare the hardware for running.
1133          */
1134         if (tty->hw_stopped && (self->flow == FLOW_START)) {
1135                 IRDA_DEBUG(0, "%s(), polling for line settings!\n", __func__ );
1136                 ircomm_param_request(self, IRCOMM_POLL, TRUE);
1137 
1138                 /* We can just as well declare the hardware for running */
1139                 ircomm_tty_send_initial_parameters(self);
1140                 ircomm_tty_link_established(self);
1141         }
1142         tty_kref_put(tty);
1143 
1144         /*
1145          * Use flip buffer functions since the code may be called from interrupt
1146          * context
1147          */
1148         tty_insert_flip_string(&self->port, skb->data, skb->len);
1149         tty_flip_buffer_push(&self->port);
1150 
1151         /* No need to kfree_skb - see ircomm_ttp_data_indication() */
1152 
1153         return 0;
1154 }
1155 
1156 /*
1157  * Function ircomm_tty_control_indication (instance, sap, skb)
1158  *
1159  *    Parse all incoming parameters (easy!)
1160  *
1161  */
1162 static int ircomm_tty_control_indication(void *instance, void *sap,
1163                                          struct sk_buff *skb)
1164 {
1165         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1166         int clen;
1167 
1168         IRDA_DEBUG(4, "%s()\n", __func__ );
1169 
1170         IRDA_ASSERT(self != NULL, return -1;);
1171         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1172         IRDA_ASSERT(skb != NULL, return -1;);
1173 
1174         clen = skb->data[0];
1175 
1176         irda_param_extract_all(self, skb->data+1, IRDA_MIN(skb->len-1, clen),
1177                                &ircomm_param_info);
1178 
1179         /* No need to kfree_skb - see ircomm_control_indication() */
1180 
1181         return 0;
1182 }
1183 
1184 /*
1185  * Function ircomm_tty_flow_indication (instance, sap, cmd)
1186  *
1187  *    This function is called by IrTTP when it wants us to slow down the
1188  *    transmission of data. We just mark the hardware as stopped, and wait
1189  *    for IrTTP to notify us that things are OK again.
1190  */
1191 static void ircomm_tty_flow_indication(void *instance, void *sap,
1192                                        LOCAL_FLOW cmd)
1193 {
1194         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1195         struct tty_struct *tty;
1196 
1197         IRDA_ASSERT(self != NULL, return;);
1198         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1199 
1200         tty = tty_port_tty_get(&self->port);
1201 
1202         switch (cmd) {
1203         case FLOW_START:
1204                 IRDA_DEBUG(2, "%s(), hw start!\n", __func__ );
1205                 if (tty)
1206                         tty->hw_stopped = 0;
1207 
1208                 /* ircomm_tty_do_softint will take care of the rest */
1209                 schedule_work(&self->tqueue);
1210                 break;
1211         default:  /* If we get here, something is very wrong, better stop */
1212         case FLOW_STOP:
1213                 IRDA_DEBUG(2, "%s(), hw stopped!\n", __func__ );
1214                 if (tty)
1215                         tty->hw_stopped = 1;
1216                 break;
1217         }
1218 
1219         tty_kref_put(tty);
1220         self->flow = cmd;
1221 }
1222 
1223 #ifdef CONFIG_PROC_FS
1224 static void ircomm_tty_line_info(struct ircomm_tty_cb *self, struct seq_file *m)
1225 {
1226         struct tty_struct *tty;
1227         char sep;
1228 
1229         seq_printf(m, "State: %s\n", ircomm_tty_state[self->state]);
1230 
1231         seq_puts(m, "Service type: ");
1232         if (self->service_type & IRCOMM_9_WIRE)
1233                 seq_puts(m, "9_WIRE");
1234         else if (self->service_type & IRCOMM_3_WIRE)
1235                 seq_puts(m, "3_WIRE");
1236         else if (self->service_type & IRCOMM_3_WIRE_RAW)
1237                 seq_puts(m, "3_WIRE_RAW");
1238         else
1239                 seq_puts(m, "No common service type!\n");
1240         seq_putc(m, '\n');
1241 
1242         seq_printf(m, "Port name: %s\n", self->settings.port_name);
1243 
1244         seq_printf(m, "DTE status:");
1245         sep = ' ';
1246         if (self->settings.dte & IRCOMM_RTS) {
1247                 seq_printf(m, "%cRTS", sep);
1248                 sep = '|';
1249         }
1250         if (self->settings.dte & IRCOMM_DTR) {
1251                 seq_printf(m, "%cDTR", sep);
1252                 sep = '|';
1253         }
1254         seq_putc(m, '\n');
1255 
1256         seq_puts(m, "DCE status:");
1257         sep = ' ';
1258         if (self->settings.dce & IRCOMM_CTS) {
1259                 seq_printf(m, "%cCTS", sep);
1260                 sep = '|';
1261         }
1262         if (self->settings.dce & IRCOMM_DSR) {
1263                 seq_printf(m, "%cDSR", sep);
1264                 sep = '|';
1265         }
1266         if (self->settings.dce & IRCOMM_CD) {
1267                 seq_printf(m, "%cCD", sep);
1268                 sep = '|';
1269         }
1270         if (self->settings.dce & IRCOMM_RI) {
1271                 seq_printf(m, "%cRI", sep);
1272                 sep = '|';
1273         }
1274         seq_putc(m, '\n');
1275 
1276         seq_puts(m, "Configuration: ");
1277         if (!self->settings.null_modem)
1278                 seq_puts(m, "DTE <-> DCE\n");
1279         else
1280                 seq_puts(m, "DTE <-> DTE (null modem emulation)\n");
1281 
1282         seq_printf(m, "Data rate: %d\n", self->settings.data_rate);
1283 
1284         seq_puts(m, "Flow control:");
1285         sep = ' ';
1286         if (self->settings.flow_control & IRCOMM_XON_XOFF_IN) {
1287                 seq_printf(m, "%cXON_XOFF_IN", sep);
1288                 sep = '|';
1289         }
1290         if (self->settings.flow_control & IRCOMM_XON_XOFF_OUT) {
1291                 seq_printf(m, "%cXON_XOFF_OUT", sep);
1292                 sep = '|';
1293         }
1294         if (self->settings.flow_control & IRCOMM_RTS_CTS_IN) {
1295                 seq_printf(m, "%cRTS_CTS_IN", sep);
1296                 sep = '|';
1297         }
1298         if (self->settings.flow_control & IRCOMM_RTS_CTS_OUT) {
1299                 seq_printf(m, "%cRTS_CTS_OUT", sep);
1300                 sep = '|';
1301         }
1302         if (self->settings.flow_control & IRCOMM_DSR_DTR_IN) {
1303                 seq_printf(m, "%cDSR_DTR_IN", sep);
1304                 sep = '|';
1305         }
1306         if (self->settings.flow_control & IRCOMM_DSR_DTR_OUT) {
1307                 seq_printf(m, "%cDSR_DTR_OUT", sep);
1308                 sep = '|';
1309         }
1310         if (self->settings.flow_control & IRCOMM_ENQ_ACK_IN) {
1311                 seq_printf(m, "%cENQ_ACK_IN", sep);
1312                 sep = '|';
1313         }
1314         if (self->settings.flow_control & IRCOMM_ENQ_ACK_OUT) {
1315                 seq_printf(m, "%cENQ_ACK_OUT", sep);
1316                 sep = '|';
1317         }
1318         seq_putc(m, '\n');
1319 
1320         seq_puts(m, "Flags:");
1321         sep = ' ';
1322         if (tty_port_cts_enabled(&self->port)) {
1323                 seq_printf(m, "%cASYNC_CTS_FLOW", sep);
1324                 sep = '|';
1325         }
1326         if (self->port.flags & ASYNC_CHECK_CD) {
1327                 seq_printf(m, "%cASYNC_CHECK_CD", sep);
1328                 sep = '|';
1329         }
1330         if (self->port.flags & ASYNC_INITIALIZED) {
1331                 seq_printf(m, "%cASYNC_INITIALIZED", sep);
1332                 sep = '|';
1333         }
1334         if (self->port.flags & ASYNC_LOW_LATENCY) {
1335                 seq_printf(m, "%cASYNC_LOW_LATENCY", sep);
1336                 sep = '|';
1337         }
1338         if (self->port.flags & ASYNC_CLOSING) {
1339                 seq_printf(m, "%cASYNC_CLOSING", sep);
1340                 sep = '|';
1341         }
1342         if (self->port.flags & ASYNC_NORMAL_ACTIVE) {
1343                 seq_printf(m, "%cASYNC_NORMAL_ACTIVE", sep);
1344                 sep = '|';
1345         }
1346         seq_putc(m, '\n');
1347 
1348         seq_printf(m, "Role: %s\n", self->client ? "client" : "server");
1349         seq_printf(m, "Open count: %d\n", self->port.count);
1350         seq_printf(m, "Max data size: %d\n", self->max_data_size);
1351         seq_printf(m, "Max header size: %d\n", self->max_header_size);
1352 
1353         tty = tty_port_tty_get(&self->port);
1354         if (tty) {
1355                 seq_printf(m, "Hardware: %s\n",
1356                                tty->hw_stopped ? "Stopped" : "Running");
1357                 tty_kref_put(tty);
1358         }
1359 }
1360 
1361 static int ircomm_tty_proc_show(struct seq_file *m, void *v)
1362 {
1363         struct ircomm_tty_cb *self;
1364         unsigned long flags;
1365 
1366         spin_lock_irqsave(&ircomm_tty->hb_spinlock, flags);
1367 
1368         self = (struct ircomm_tty_cb *) hashbin_get_first(ircomm_tty);
1369         while (self != NULL) {
1370                 if (self->magic != IRCOMM_TTY_MAGIC)
1371                         break;
1372 
1373                 ircomm_tty_line_info(self, m);
1374                 self = (struct ircomm_tty_cb *) hashbin_get_next(ircomm_tty);
1375         }
1376         spin_unlock_irqrestore(&ircomm_tty->hb_spinlock, flags);
1377         return 0;
1378 }
1379 
1380 static int ircomm_tty_proc_open(struct inode *inode, struct file *file)
1381 {
1382         return single_open(file, ircomm_tty_proc_show, NULL);
1383 }
1384 
1385 static const struct file_operations ircomm_tty_proc_fops = {
1386         .owner          = THIS_MODULE,
1387         .open           = ircomm_tty_proc_open,
1388         .read           = seq_read,
1389         .llseek         = seq_lseek,
1390         .release        = single_release,
1391 };
1392 #endif /* CONFIG_PROC_FS */
1393 
1394 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
1395 MODULE_DESCRIPTION("IrCOMM serial TTY driver");
1396 MODULE_LICENSE("GPL");
1397 MODULE_ALIAS_CHARDEV_MAJOR(IRCOMM_TTY_MAJOR);
1398 
1399 module_init(ircomm_tty_init);
1400 module_exit(ircomm_tty_cleanup);
1401 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp