496ce2cebcd7316f7a1eab1051758e2f90b22263
[linux-3.10.git] / net / irda / ircomm / ircomm_tty.c
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         kfree(self);
187 }
188
189 /*
190  * Function ircomm_tty_cleanup ()
191  *
192  *    Remove IrCOMM TTY layer/driver
193  *
194  */
195 static void __exit ircomm_tty_cleanup(void)
196 {
197         int ret;
198
199         IRDA_DEBUG(4, "%s()\n", __func__ );
200
201         ret = tty_unregister_driver(driver);
202         if (ret) {
203                 IRDA_ERROR("%s(), failed to unregister driver\n",
204                            __func__);
205                 return;
206         }
207
208         hashbin_delete(ircomm_tty, (FREE_FUNC) __ircomm_tty_cleanup);
209         put_tty_driver(driver);
210 }
211
212 /*
213  * Function ircomm_startup (self)
214  *
215  *
216  *
217  */
218 static int ircomm_tty_startup(struct ircomm_tty_cb *self)
219 {
220         notify_t notify;
221         int ret = -ENODEV;
222
223         IRDA_DEBUG(2, "%s()\n", __func__ );
224
225         IRDA_ASSERT(self != NULL, return -1;);
226         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
227
228         /* Check if already open */
229         if (test_and_set_bit(ASYNCB_INITIALIZED, &self->port.flags)) {
230                 IRDA_DEBUG(2, "%s(), already open so break out!\n", __func__ );
231                 return 0;
232         }
233
234         /* Register with IrCOMM */
235         irda_notify_init(&notify);
236         /* These callbacks we must handle ourselves */
237         notify.data_indication       = ircomm_tty_data_indication;
238         notify.udata_indication      = ircomm_tty_control_indication;
239         notify.flow_indication       = ircomm_tty_flow_indication;
240
241         /* Use the ircomm_tty interface for these ones */
242         notify.disconnect_indication = ircomm_tty_disconnect_indication;
243         notify.connect_confirm       = ircomm_tty_connect_confirm;
244         notify.connect_indication    = ircomm_tty_connect_indication;
245         strlcpy(notify.name, "ircomm_tty", sizeof(notify.name));
246         notify.instance = self;
247
248         if (!self->ircomm) {
249                 self->ircomm = ircomm_open(&notify, self->service_type,
250                                            self->line);
251         }
252         if (!self->ircomm)
253                 goto err;
254
255         self->slsap_sel = self->ircomm->slsap_sel;
256
257         /* Connect IrCOMM link with remote device */
258         ret = ircomm_tty_attach_cable(self);
259         if (ret < 0) {
260                 IRDA_ERROR("%s(), error attaching cable!\n", __func__);
261                 goto err;
262         }
263
264         return 0;
265 err:
266         clear_bit(ASYNCB_INITIALIZED, &self->port.flags);
267         return ret;
268 }
269
270 /*
271  * Function ircomm_block_til_ready (self, filp)
272  *
273  *
274  *
275  */
276 static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self,
277                 struct tty_struct *tty, struct file *filp)
278 {
279         struct tty_port *port = &self->port;
280         DECLARE_WAITQUEUE(wait, current);
281         int             retval;
282         int             do_clocal = 0, extra_count = 0;
283         unsigned long   flags;
284
285         IRDA_DEBUG(2, "%s()\n", __func__ );
286
287         /*
288          * If non-blocking mode is set, or the port is not enabled,
289          * then make the check up front and then exit.
290          */
291         if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
292                 /* nonblock mode is set or port is not enabled */
293                 port->flags |= ASYNC_NORMAL_ACTIVE;
294                 IRDA_DEBUG(1, "%s(), O_NONBLOCK requested!\n", __func__ );
295                 return 0;
296         }
297
298         if (tty->termios.c_cflag & CLOCAL) {
299                 IRDA_DEBUG(1, "%s(), doing CLOCAL!\n", __func__ );
300                 do_clocal = 1;
301         }
302
303         /* Wait for carrier detect and the line to become
304          * free (i.e., not in use by the callout).  While we are in
305          * this loop, port->count is dropped by one, so that
306          * mgsl_close() knows when to free things.  We restore it upon
307          * exit, either normal or abnormal.
308          */
309
310         retval = 0;
311         add_wait_queue(&port->open_wait, &wait);
312
313         IRDA_DEBUG(2, "%s(%d):block_til_ready before block on %s open_count=%d\n",
314               __FILE__, __LINE__, tty->driver->name, port->count);
315
316         spin_lock_irqsave(&port->lock, flags);
317         if (!tty_hung_up_p(filp)) {
318                 extra_count = 1;
319                 port->count--;
320         }
321         spin_unlock_irqrestore(&port->lock, flags);
322         port->blocked_open++;
323
324         while (1) {
325                 if (tty->termios.c_cflag & CBAUD)
326                         tty_port_raise_dtr_rts(port);
327
328                 current->state = TASK_INTERRUPTIBLE;
329
330                 if (tty_hung_up_p(filp) ||
331                     !test_bit(ASYNCB_INITIALIZED, &port->flags)) {
332                         retval = (port->flags & ASYNC_HUP_NOTIFY) ?
333                                         -EAGAIN : -ERESTARTSYS;
334                         break;
335                 }
336
337                 /*
338                  * Check if link is ready now. Even if CLOCAL is
339                  * specified, we cannot return before the IrCOMM link is
340                  * ready
341                  */
342                 if (!test_bit(ASYNCB_CLOSING, &port->flags) &&
343                     (do_clocal || tty_port_carrier_raised(port)) &&
344                     self->state == IRCOMM_TTY_READY)
345                 {
346                         break;
347                 }
348
349                 if (signal_pending(current)) {
350                         retval = -ERESTARTSYS;
351                         break;
352                 }
353
354                 IRDA_DEBUG(1, "%s(%d):block_til_ready blocking on %s open_count=%d\n",
355                       __FILE__, __LINE__, tty->driver->name, port->count);
356
357                 schedule();
358         }
359
360         __set_current_state(TASK_RUNNING);
361         remove_wait_queue(&port->open_wait, &wait);
362
363         if (extra_count) {
364                 /* ++ is not atomic, so this should be protected - Jean II */
365                 spin_lock_irqsave(&port->lock, flags);
366                 port->count++;
367                 spin_unlock_irqrestore(&port->lock, flags);
368         }
369         port->blocked_open--;
370
371         IRDA_DEBUG(1, "%s(%d):block_til_ready after blocking on %s open_count=%d\n",
372               __FILE__, __LINE__, tty->driver->name, port->count);
373
374         if (!retval)
375                 port->flags |= ASYNC_NORMAL_ACTIVE;
376
377         return retval;
378 }
379
380
381 static int ircomm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
382 {
383         struct ircomm_tty_cb *self;
384         unsigned int line = tty->index;
385
386         /* Check if instance already exists */
387         self = hashbin_lock_find(ircomm_tty, line, NULL);
388         if (!self) {
389                 /* No, so make new instance */
390                 self = kzalloc(sizeof(struct ircomm_tty_cb), GFP_KERNEL);
391                 if (self == NULL) {
392                         IRDA_ERROR("%s(), kmalloc failed!\n", __func__);
393                         return -ENOMEM;
394                 }
395
396                 tty_port_init(&self->port);
397                 self->port.ops = &ircomm_port_ops;
398                 self->magic = IRCOMM_TTY_MAGIC;
399                 self->flow = FLOW_STOP;
400
401                 self->line = line;
402                 INIT_WORK(&self->tqueue, ircomm_tty_do_softint);
403                 self->max_header_size = IRCOMM_TTY_HDR_UNINITIALISED;
404                 self->max_data_size = IRCOMM_TTY_DATA_UNINITIALISED;
405
406                 /* Init some important stuff */
407                 init_timer(&self->watchdog_timer);
408                 spin_lock_init(&self->spinlock);
409
410                 /*
411                  * Force TTY into raw mode by default which is usually what
412                  * we want for IrCOMM and IrLPT. This way applications will
413                  * not have to twiddle with printcap etc.
414                  *
415                  * Note this is completely usafe and doesn't work properly
416                  */
417                 tty->termios.c_iflag = 0;
418                 tty->termios.c_oflag = 0;
419
420                 /* Insert into hash */
421                 hashbin_insert(ircomm_tty, (irda_queue_t *) self, line, NULL);
422         }
423
424         tty->driver_data = self;
425
426         return tty_port_install(&self->port, driver, tty);
427 }
428
429 /*
430  * Function ircomm_tty_open (tty, filp)
431  *
432  *    This routine is called when a particular tty device is opened. This
433  *    routine is mandatory; if this routine is not filled in, the attempted
434  *    open will fail with ENODEV.
435  */
436 static int ircomm_tty_open(struct tty_struct *tty, struct file *filp)
437 {
438         struct ircomm_tty_cb *self = tty->driver_data;
439         unsigned long   flags;
440         int ret;
441
442         IRDA_DEBUG(2, "%s()\n", __func__ );
443
444         /* ++ is not atomic, so this should be protected - Jean II */
445         spin_lock_irqsave(&self->port.lock, flags);
446         self->port.count++;
447         spin_unlock_irqrestore(&self->port.lock, flags);
448         tty_port_tty_set(&self->port, tty);
449
450         IRDA_DEBUG(1, "%s(), %s%d, count = %d\n", __func__ , tty->driver->name,
451                    self->line, self->port.count);
452
453         /* Not really used by us, but lets do it anyway */
454         tty->low_latency = (self->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
455
456         /*
457          * If the port is the middle of closing, bail out now
458          */
459         if (tty_hung_up_p(filp) ||
460             test_bit(ASYNCB_CLOSING, &self->port.flags)) {
461
462                 /* Hm, why are we blocking on ASYNC_CLOSING if we
463                  * do return -EAGAIN/-ERESTARTSYS below anyway?
464                  * IMHO it's either not needed in the first place
465                  * or for some reason we need to make sure the async
466                  * closing has been finished - if so, wouldn't we
467                  * probably better sleep uninterruptible?
468                  */
469
470                 if (wait_event_interruptible(self->port.close_wait,
471                                 !test_bit(ASYNCB_CLOSING, &self->port.flags))) {
472                         IRDA_WARNING("%s - got signal while blocking on ASYNC_CLOSING!\n",
473                                      __func__);
474                         return -ERESTARTSYS;
475                 }
476
477 #ifdef SERIAL_DO_RESTART
478                 return (self->port.flags & ASYNC_HUP_NOTIFY) ?
479                         -EAGAIN : -ERESTARTSYS;
480 #else
481                 return -EAGAIN;
482 #endif
483         }
484
485         /* Check if this is a "normal" ircomm device, or an irlpt device */
486         if (self->line < 0x10) {
487                 self->service_type = IRCOMM_3_WIRE | IRCOMM_9_WIRE;
488                 self->settings.service_type = IRCOMM_9_WIRE; /* 9 wire as default */
489                 /* Jan Kiszka -> add DSR/RI -> Conform to IrCOMM spec */
490                 self->settings.dce = IRCOMM_CTS | IRCOMM_CD | IRCOMM_DSR | IRCOMM_RI; /* Default line settings */
491                 IRDA_DEBUG(2, "%s(), IrCOMM device\n", __func__ );
492         } else {
493                 IRDA_DEBUG(2, "%s(), IrLPT device\n", __func__ );
494                 self->service_type = IRCOMM_3_WIRE_RAW;
495                 self->settings.service_type = IRCOMM_3_WIRE_RAW; /* Default */
496         }
497
498         ret = ircomm_tty_startup(self);
499         if (ret)
500                 return ret;
501
502         ret = ircomm_tty_block_til_ready(self, tty, filp);
503         if (ret) {
504                 IRDA_DEBUG(2,
505                       "%s(), returning after block_til_ready with %d\n", __func__ ,
506                       ret);
507
508                 return ret;
509         }
510         return 0;
511 }
512
513 /*
514  * Function ircomm_tty_close (tty, filp)
515  *
516  *    This routine is called when a particular tty device is closed.
517  *
518  */
519 static void ircomm_tty_close(struct tty_struct *tty, struct file *filp)
520 {
521         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
522         struct tty_port *port = &self->port;
523
524         IRDA_DEBUG(0, "%s()\n", __func__ );
525
526         IRDA_ASSERT(self != NULL, return;);
527         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
528
529         if (tty_port_close_start(port, tty, filp) == 0)
530                 return;
531
532         ircomm_tty_shutdown(self);
533
534         tty_driver_flush_buffer(tty);
535
536         tty_port_close_end(port, tty);
537         tty_port_tty_set(port, NULL);
538 }
539
540 /*
541  * Function ircomm_tty_flush_buffer (tty)
542  *
543  *
544  *
545  */
546 static void ircomm_tty_flush_buffer(struct tty_struct *tty)
547 {
548         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
549
550         IRDA_ASSERT(self != NULL, return;);
551         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
552
553         /*
554          * Let do_softint() do this to avoid race condition with
555          * do_softint() ;-)
556          */
557         schedule_work(&self->tqueue);
558 }
559
560 /*
561  * Function ircomm_tty_do_softint (work)
562  *
563  *    We use this routine to give the write wakeup to the user at at a
564  *    safe time (as fast as possible after write have completed). This
565  *    can be compared to the Tx interrupt.
566  */
567 static void ircomm_tty_do_softint(struct work_struct *work)
568 {
569         struct ircomm_tty_cb *self =
570                 container_of(work, struct ircomm_tty_cb, tqueue);
571         struct tty_struct *tty;
572         unsigned long flags;
573         struct sk_buff *skb, *ctrl_skb;
574
575         IRDA_DEBUG(2, "%s()\n", __func__ );
576
577         if (!self || self->magic != IRCOMM_TTY_MAGIC)
578                 return;
579
580         tty = tty_port_tty_get(&self->port);
581         if (!tty)
582                 return;
583
584         /* Unlink control buffer */
585         spin_lock_irqsave(&self->spinlock, flags);
586
587         ctrl_skb = self->ctrl_skb;
588         self->ctrl_skb = NULL;
589
590         spin_unlock_irqrestore(&self->spinlock, flags);
591
592         /* Flush control buffer if any */
593         if(ctrl_skb) {
594                 if(self->flow == FLOW_START)
595                         ircomm_control_request(self->ircomm, ctrl_skb);
596                 /* Drop reference count - see ircomm_ttp_data_request(). */
597                 dev_kfree_skb(ctrl_skb);
598         }
599
600         if (tty->hw_stopped)
601                 goto put;
602
603         /* Unlink transmit buffer */
604         spin_lock_irqsave(&self->spinlock, flags);
605
606         skb = self->tx_skb;
607         self->tx_skb = NULL;
608
609         spin_unlock_irqrestore(&self->spinlock, flags);
610
611         /* Flush transmit buffer if any */
612         if (skb) {
613                 ircomm_tty_do_event(self, IRCOMM_TTY_DATA_REQUEST, skb, NULL);
614                 /* Drop reference count - see ircomm_ttp_data_request(). */
615                 dev_kfree_skb(skb);
616         }
617
618         /* Check if user (still) wants to be waken up */
619         tty_wakeup(tty);
620 put:
621         tty_kref_put(tty);
622 }
623
624 /*
625  * Function ircomm_tty_write (tty, buf, count)
626  *
627  *    This routine is called by the kernel to write a series of characters
628  *    to the tty device. The characters may come from user space or kernel
629  *    space. This routine will return the number of characters actually
630  *    accepted for writing. This routine is mandatory.
631  */
632 static int ircomm_tty_write(struct tty_struct *tty,
633                             const unsigned char *buf, int count)
634 {
635         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
636         unsigned long flags;
637         struct sk_buff *skb;
638         int tailroom = 0;
639         int len = 0;
640         int size;
641
642         IRDA_DEBUG(2, "%s(), count=%d, hw_stopped=%d\n", __func__ , count,
643                    tty->hw_stopped);
644
645         IRDA_ASSERT(self != NULL, return -1;);
646         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
647
648         /* We may receive packets from the TTY even before we have finished
649          * our setup. Not cool.
650          * The problem is that we don't know the final header and data size
651          * to create the proper skb, so any skb we would create would have
652          * bogus header and data size, so need care.
653          * We use a bogus header size to safely detect this condition.
654          * Another problem is that hw_stopped was set to 0 way before it
655          * should be, so we would drop this skb. It should now be fixed.
656          * One option is to not accept data until we are properly setup.
657          * But, I suspect that when it happens, the ppp line discipline
658          * just "drops" the data, which might screw up connect scripts.
659          * The second option is to create a "safe skb", with large header
660          * and small size (see ircomm_tty_open() for values).
661          * We just need to make sure that when the real values get filled,
662          * we don't mess up the original "safe skb" (see tx_data_size).
663          * Jean II */
664         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) {
665                 IRDA_DEBUG(1, "%s() : not initialised\n", __func__);
666 #ifdef IRCOMM_NO_TX_BEFORE_INIT
667                 /* We didn't consume anything, TTY will retry */
668                 return 0;
669 #endif
670         }
671
672         if (count < 1)
673                 return 0;
674
675         /* Protect our manipulation of self->tx_skb and related */
676         spin_lock_irqsave(&self->spinlock, flags);
677
678         /* Fetch current transmit buffer */
679         skb = self->tx_skb;
680
681         /*
682          * Send out all the data we get, possibly as multiple fragmented
683          * frames, but this will only happen if the data is larger than the
684          * max data size. The normal case however is just the opposite, and
685          * this function may be called multiple times, and will then actually
686          * defragment the data and send it out as one packet as soon as
687          * possible, but at a safer point in time
688          */
689         while (count) {
690                 size = count;
691
692                 /* Adjust data size to the max data size */
693                 if (size > self->max_data_size)
694                         size = self->max_data_size;
695
696                 /*
697                  * Do we already have a buffer ready for transmit, or do
698                  * we need to allocate a new frame
699                  */
700                 if (skb) {
701                         /*
702                          * Any room for more data at the end of the current
703                          * transmit buffer? Cannot use skb_tailroom, since
704                          * dev_alloc_skb gives us a larger skb than we
705                          * requested
706                          * Note : use tx_data_size, because max_data_size
707                          * may have changed and we don't want to overwrite
708                          * the skb. - Jean II
709                          */
710                         if ((tailroom = (self->tx_data_size - skb->len)) > 0) {
711                                 /* Adjust data to tailroom */
712                                 if (size > tailroom)
713                                         size = tailroom;
714                         } else {
715                                 /*
716                                  * Current transmit frame is full, so break
717                                  * out, so we can send it as soon as possible
718                                  */
719                                 break;
720                         }
721                 } else {
722                         /* Prepare a full sized frame */
723                         skb = alloc_skb(self->max_data_size+
724                                         self->max_header_size,
725                                         GFP_ATOMIC);
726                         if (!skb) {
727                                 spin_unlock_irqrestore(&self->spinlock, flags);
728                                 return -ENOBUFS;
729                         }
730                         skb_reserve(skb, self->max_header_size);
731                         self->tx_skb = skb;
732                         /* Remember skb size because max_data_size may
733                          * change later on - Jean II */
734                         self->tx_data_size = self->max_data_size;
735                 }
736
737                 /* Copy data */
738                 memcpy(skb_put(skb,size), buf + len, size);
739
740                 count -= size;
741                 len += size;
742         }
743
744         spin_unlock_irqrestore(&self->spinlock, flags);
745
746         /*
747          * Schedule a new thread which will transmit the frame as soon
748          * as possible, but at a safe point in time. We do this so the
749          * "user" can give us data multiple times, as PPP does (because of
750          * its 256 byte tx buffer). We will then defragment and send out
751          * all this data as one single packet.
752          */
753         schedule_work(&self->tqueue);
754
755         return len;
756 }
757
758 /*
759  * Function ircomm_tty_write_room (tty)
760  *
761  *    This routine returns the numbers of characters the tty driver will
762  *    accept for queuing to be written. This number is subject to change as
763  *    output buffers get emptied, or if the output flow control is acted.
764  */
765 static int ircomm_tty_write_room(struct tty_struct *tty)
766 {
767         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
768         unsigned long flags;
769         int ret;
770
771         IRDA_ASSERT(self != NULL, return -1;);
772         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
773
774 #ifdef IRCOMM_NO_TX_BEFORE_INIT
775         /* max_header_size tells us if the channel is initialised or not. */
776         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED)
777                 /* Don't bother us yet */
778                 return 0;
779 #endif
780
781         /* Check if we are allowed to transmit any data.
782          * hw_stopped is the regular flow control.
783          * Jean II */
784         if (tty->hw_stopped)
785                 ret = 0;
786         else {
787                 spin_lock_irqsave(&self->spinlock, flags);
788                 if (self->tx_skb)
789                         ret = self->tx_data_size - self->tx_skb->len;
790                 else
791                         ret = self->max_data_size;
792                 spin_unlock_irqrestore(&self->spinlock, flags);
793         }
794         IRDA_DEBUG(2, "%s(), ret=%d\n", __func__ , ret);
795
796         return ret;
797 }
798
799 /*
800  * Function ircomm_tty_wait_until_sent (tty, timeout)
801  *
802  *    This routine waits until the device has written out all of the
803  *    characters in its transmitter FIFO.
804  */
805 static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout)
806 {
807         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
808         unsigned long orig_jiffies, poll_time;
809         unsigned long flags;
810
811         IRDA_DEBUG(2, "%s()\n", __func__ );
812
813         IRDA_ASSERT(self != NULL, return;);
814         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
815
816         orig_jiffies = jiffies;
817
818         /* Set poll time to 200 ms */
819         poll_time = IRDA_MIN(timeout, msecs_to_jiffies(200));
820
821         spin_lock_irqsave(&self->spinlock, flags);
822         while (self->tx_skb && self->tx_skb->len) {
823                 spin_unlock_irqrestore(&self->spinlock, flags);
824                 schedule_timeout_interruptible(poll_time);
825                 spin_lock_irqsave(&self->spinlock, flags);
826                 if (signal_pending(current))
827                         break;
828                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
829                         break;
830         }
831         spin_unlock_irqrestore(&self->spinlock, flags);
832         current->state = TASK_RUNNING;
833 }
834
835 /*
836  * Function ircomm_tty_throttle (tty)
837  *
838  *    This routine notifies the tty driver that input buffers for the line
839  *    discipline are close to full, and it should somehow signal that no
840  *    more characters should be sent to the tty.
841  */
842 static void ircomm_tty_throttle(struct tty_struct *tty)
843 {
844         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
845
846         IRDA_DEBUG(2, "%s()\n", __func__ );
847
848         IRDA_ASSERT(self != NULL, return;);
849         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
850
851         /* Software flow control? */
852         if (I_IXOFF(tty))
853                 ircomm_tty_send_xchar(tty, STOP_CHAR(tty));
854
855         /* Hardware flow control? */
856         if (tty->termios.c_cflag & CRTSCTS) {
857                 self->settings.dte &= ~IRCOMM_RTS;
858                 self->settings.dte |= IRCOMM_DELTA_RTS;
859
860                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
861         }
862
863         ircomm_flow_request(self->ircomm, FLOW_STOP);
864 }
865
866 /*
867  * Function ircomm_tty_unthrottle (tty)
868  *
869  *    This routine notifies the tty drivers that it should signals that
870  *    characters can now be sent to the tty without fear of overrunning the
871  *    input buffers of the line disciplines.
872  */
873 static void ircomm_tty_unthrottle(struct tty_struct *tty)
874 {
875         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
876
877         IRDA_DEBUG(2, "%s()\n", __func__ );
878
879         IRDA_ASSERT(self != NULL, return;);
880         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
881
882         /* Using software flow control? */
883         if (I_IXOFF(tty)) {
884                 ircomm_tty_send_xchar(tty, START_CHAR(tty));
885         }
886
887         /* Using hardware flow control? */
888         if (tty->termios.c_cflag & CRTSCTS) {
889                 self->settings.dte |= (IRCOMM_RTS|IRCOMM_DELTA_RTS);
890
891                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
892                 IRDA_DEBUG(1, "%s(), FLOW_START\n", __func__ );
893         }
894         ircomm_flow_request(self->ircomm, FLOW_START);
895 }
896
897 /*
898  * Function ircomm_tty_chars_in_buffer (tty)
899  *
900  *    Indicates if there are any data in the buffer
901  *
902  */
903 static int ircomm_tty_chars_in_buffer(struct tty_struct *tty)
904 {
905         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
906         unsigned long flags;
907         int len = 0;
908
909         IRDA_ASSERT(self != NULL, return -1;);
910         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
911
912         spin_lock_irqsave(&self->spinlock, flags);
913
914         if (self->tx_skb)
915                 len = self->tx_skb->len;
916
917         spin_unlock_irqrestore(&self->spinlock, flags);
918
919         return len;
920 }
921
922 static void ircomm_tty_shutdown(struct ircomm_tty_cb *self)
923 {
924         unsigned long flags;
925
926         IRDA_ASSERT(self != NULL, return;);
927         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
928
929         IRDA_DEBUG(0, "%s()\n", __func__ );
930
931         if (!test_and_clear_bit(ASYNCB_INITIALIZED, &self->port.flags))
932                 return;
933
934         ircomm_tty_detach_cable(self);
935
936         spin_lock_irqsave(&self->spinlock, flags);
937
938         del_timer(&self->watchdog_timer);
939
940         /* Free parameter buffer */
941         if (self->ctrl_skb) {
942                 dev_kfree_skb(self->ctrl_skb);
943                 self->ctrl_skb = NULL;
944         }
945
946         /* Free transmit buffer */
947         if (self->tx_skb) {
948                 dev_kfree_skb(self->tx_skb);
949                 self->tx_skb = NULL;
950         }
951
952         if (self->ircomm) {
953                 ircomm_close(self->ircomm);
954                 self->ircomm = NULL;
955         }
956
957         spin_unlock_irqrestore(&self->spinlock, flags);
958 }
959
960 /*
961  * Function ircomm_tty_hangup (tty)
962  *
963  *    This routine notifies the tty driver that it should hangup the tty
964  *    device.
965  *
966  */
967 static void ircomm_tty_hangup(struct tty_struct *tty)
968 {
969         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
970         struct tty_port *port = &self->port;
971         unsigned long   flags;
972
973         IRDA_DEBUG(0, "%s()\n", __func__ );
974
975         IRDA_ASSERT(self != NULL, return;);
976         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
977
978         /* ircomm_tty_flush_buffer(tty); */
979         ircomm_tty_shutdown(self);
980
981         spin_lock_irqsave(&port->lock, flags);
982         port->flags &= ~ASYNC_NORMAL_ACTIVE;
983         if (port->tty) {
984                 set_bit(TTY_IO_ERROR, &port->tty->flags);
985                 tty_kref_put(port->tty);
986         }
987         port->tty = NULL;
988         port->count = 0;
989         spin_unlock_irqrestore(&port->lock, flags);
990
991         wake_up_interruptible(&port->open_wait);
992 }
993
994 /*
995  * Function ircomm_tty_send_xchar (tty, ch)
996  *
997  *    This routine is used to send a high-priority XON/XOFF character to
998  *    the device.
999  */
1000 static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch)
1001 {
1002         IRDA_DEBUG(0, "%s(), not impl\n", __func__ );
1003 }
1004
1005 /*
1006  * Function ircomm_tty_start (tty)
1007  *
1008  *    This routine notifies the tty driver that it resume sending
1009  *    characters to the tty device.
1010  */
1011 void ircomm_tty_start(struct tty_struct *tty)
1012 {
1013         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1014
1015         ircomm_flow_request(self->ircomm, FLOW_START);
1016 }
1017
1018 /*
1019  * Function ircomm_tty_stop (tty)
1020  *
1021  *     This routine notifies the tty driver that it should stop outputting
1022  *     characters to the tty device.
1023  */
1024 static void ircomm_tty_stop(struct tty_struct *tty)
1025 {
1026         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1027
1028         IRDA_ASSERT(self != NULL, return;);
1029         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1030
1031         ircomm_flow_request(self->ircomm, FLOW_STOP);
1032 }
1033
1034 /*
1035  * Function ircomm_check_modem_status (self)
1036  *
1037  *    Check for any changes in the DCE's line settings. This function should
1038  *    be called whenever the dce parameter settings changes, to update the
1039  *    flow control settings and other things
1040  */
1041 void ircomm_tty_check_modem_status(struct ircomm_tty_cb *self)
1042 {
1043         struct tty_struct *tty;
1044         int status;
1045
1046         IRDA_DEBUG(0, "%s()\n", __func__ );
1047
1048         IRDA_ASSERT(self != NULL, return;);
1049         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1050
1051         tty = tty_port_tty_get(&self->port);
1052
1053         status = self->settings.dce;
1054
1055         if (status & IRCOMM_DCE_DELTA_ANY) {
1056                 /*wake_up_interruptible(&self->delta_msr_wait);*/
1057         }
1058         if ((self->port.flags & ASYNC_CHECK_CD) && (status & IRCOMM_DELTA_CD)) {
1059                 IRDA_DEBUG(2,
1060                            "%s(), ircomm%d CD now %s...\n", __func__ , self->line,
1061                            (status & IRCOMM_CD) ? "on" : "off");
1062
1063                 if (status & IRCOMM_CD) {
1064                         wake_up_interruptible(&self->port.open_wait);
1065                 } else {
1066                         IRDA_DEBUG(2,
1067                                    "%s(), Doing serial hangup..\n", __func__ );
1068                         if (tty)
1069                                 tty_hangup(tty);
1070
1071                         /* Hangup will remote the tty, so better break out */
1072                         goto put;
1073                 }
1074         }
1075         if (tty && tty_port_cts_enabled(&self->port)) {
1076                 if (tty->hw_stopped) {
1077                         if (status & IRCOMM_CTS) {
1078                                 IRDA_DEBUG(2,
1079                                            "%s(), CTS tx start...\n", __func__ );
1080                                 tty->hw_stopped = 0;
1081
1082                                 /* Wake up processes blocked on open */
1083                                 wake_up_interruptible(&self->port.open_wait);
1084
1085                                 schedule_work(&self->tqueue);
1086                                 goto put;
1087                         }
1088                 } else {
1089                         if (!(status & IRCOMM_CTS)) {
1090                                 IRDA_DEBUG(2,
1091                                            "%s(), CTS tx stop...\n", __func__ );
1092                                 tty->hw_stopped = 1;
1093                         }
1094                 }
1095         }
1096 put:
1097         tty_kref_put(tty);
1098 }
1099
1100 /*
1101  * Function ircomm_tty_data_indication (instance, sap, skb)
1102  *
1103  *    Handle incoming data, and deliver it to the line discipline
1104  *
1105  */
1106 static int ircomm_tty_data_indication(void *instance, void *sap,
1107                                       struct sk_buff *skb)
1108 {
1109         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1110         struct tty_struct *tty;
1111
1112         IRDA_DEBUG(2, "%s()\n", __func__ );
1113
1114         IRDA_ASSERT(self != NULL, return -1;);
1115         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1116         IRDA_ASSERT(skb != NULL, return -1;);
1117
1118         tty = tty_port_tty_get(&self->port);
1119         if (!tty) {
1120                 IRDA_DEBUG(0, "%s(), no tty!\n", __func__ );
1121                 return 0;
1122         }
1123
1124         /*
1125          * If we receive data when hardware is stopped then something is wrong.
1126          * We try to poll the peers line settings to check if we are up todate.
1127          * Devices like WinCE can do this, and since they don't send any
1128          * params, we can just as well declare the hardware for running.
1129          */
1130         if (tty->hw_stopped && (self->flow == FLOW_START)) {
1131                 IRDA_DEBUG(0, "%s(), polling for line settings!\n", __func__ );
1132                 ircomm_param_request(self, IRCOMM_POLL, TRUE);
1133
1134                 /* We can just as well declare the hardware for running */
1135                 ircomm_tty_send_initial_parameters(self);
1136                 ircomm_tty_link_established(self);
1137         }
1138
1139         /*
1140          * Use flip buffer functions since the code may be called from interrupt
1141          * context
1142          */
1143         tty_insert_flip_string(tty, skb->data, skb->len);
1144         tty_flip_buffer_push(tty);
1145         tty_kref_put(tty);
1146
1147         /* No need to kfree_skb - see ircomm_ttp_data_indication() */
1148
1149         return 0;
1150 }
1151
1152 /*
1153  * Function ircomm_tty_control_indication (instance, sap, skb)
1154  *
1155  *    Parse all incoming parameters (easy!)
1156  *
1157  */
1158 static int ircomm_tty_control_indication(void *instance, void *sap,
1159                                          struct sk_buff *skb)
1160 {
1161         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1162         int clen;
1163
1164         IRDA_DEBUG(4, "%s()\n", __func__ );
1165
1166         IRDA_ASSERT(self != NULL, return -1;);
1167         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1168         IRDA_ASSERT(skb != NULL, return -1;);
1169
1170         clen = skb->data[0];
1171
1172         irda_param_extract_all(self, skb->data+1, IRDA_MIN(skb->len-1, clen),
1173                                &ircomm_param_info);
1174
1175         /* No need to kfree_skb - see ircomm_control_indication() */
1176
1177         return 0;
1178 }
1179
1180 /*
1181  * Function ircomm_tty_flow_indication (instance, sap, cmd)
1182  *
1183  *    This function is called by IrTTP when it wants us to slow down the
1184  *    transmission of data. We just mark the hardware as stopped, and wait
1185  *    for IrTTP to notify us that things are OK again.
1186  */
1187 static void ircomm_tty_flow_indication(void *instance, void *sap,
1188                                        LOCAL_FLOW cmd)
1189 {
1190         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1191         struct tty_struct *tty;
1192
1193         IRDA_ASSERT(self != NULL, return;);
1194         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1195
1196         tty = tty_port_tty_get(&self->port);
1197
1198         switch (cmd) {
1199         case FLOW_START:
1200                 IRDA_DEBUG(2, "%s(), hw start!\n", __func__ );
1201                 if (tty)
1202                         tty->hw_stopped = 0;
1203
1204                 /* ircomm_tty_do_softint will take care of the rest */
1205                 schedule_work(&self->tqueue);
1206                 break;
1207         default:  /* If we get here, something is very wrong, better stop */
1208         case FLOW_STOP:
1209                 IRDA_DEBUG(2, "%s(), hw stopped!\n", __func__ );
1210                 if (tty)
1211                         tty->hw_stopped = 1;
1212                 break;
1213         }
1214
1215         tty_kref_put(tty);
1216         self->flow = cmd;
1217 }
1218
1219 #ifdef CONFIG_PROC_FS
1220 static void ircomm_tty_line_info(struct ircomm_tty_cb *self, struct seq_file *m)
1221 {
1222         struct tty_struct *tty;
1223         char sep;
1224
1225         seq_printf(m, "State: %s\n", ircomm_tty_state[self->state]);
1226
1227         seq_puts(m, "Service type: ");
1228         if (self->service_type & IRCOMM_9_WIRE)
1229                 seq_puts(m, "9_WIRE");
1230         else if (self->service_type & IRCOMM_3_WIRE)
1231                 seq_puts(m, "3_WIRE");
1232         else if (self->service_type & IRCOMM_3_WIRE_RAW)
1233                 seq_puts(m, "3_WIRE_RAW");
1234         else
1235                 seq_puts(m, "No common service type!\n");
1236         seq_putc(m, '\n');
1237
1238         seq_printf(m, "Port name: %s\n", self->settings.port_name);
1239
1240         seq_printf(m, "DTE status:");
1241         sep = ' ';
1242         if (self->settings.dte & IRCOMM_RTS) {
1243                 seq_printf(m, "%cRTS", sep);
1244                 sep = '|';
1245         }
1246         if (self->settings.dte & IRCOMM_DTR) {
1247                 seq_printf(m, "%cDTR", sep);
1248                 sep = '|';
1249         }
1250         seq_putc(m, '\n');
1251
1252         seq_puts(m, "DCE status:");
1253         sep = ' ';
1254         if (self->settings.dce & IRCOMM_CTS) {
1255                 seq_printf(m, "%cCTS", sep);
1256                 sep = '|';
1257         }
1258         if (self->settings.dce & IRCOMM_DSR) {
1259                 seq_printf(m, "%cDSR", sep);
1260                 sep = '|';
1261         }
1262         if (self->settings.dce & IRCOMM_CD) {
1263                 seq_printf(m, "%cCD", sep);
1264                 sep = '|';
1265         }
1266         if (self->settings.dce & IRCOMM_RI) {
1267                 seq_printf(m, "%cRI", sep);
1268                 sep = '|';
1269         }
1270         seq_putc(m, '\n');
1271
1272         seq_puts(m, "Configuration: ");
1273         if (!self->settings.null_modem)
1274                 seq_puts(m, "DTE <-> DCE\n");
1275         else
1276                 seq_puts(m, "DTE <-> DTE (null modem emulation)\n");
1277
1278         seq_printf(m, "Data rate: %d\n", self->settings.data_rate);
1279
1280         seq_puts(m, "Flow control:");
1281         sep = ' ';
1282         if (self->settings.flow_control & IRCOMM_XON_XOFF_IN) {
1283                 seq_printf(m, "%cXON_XOFF_IN", sep);
1284                 sep = '|';
1285         }
1286         if (self->settings.flow_control & IRCOMM_XON_XOFF_OUT) {
1287                 seq_printf(m, "%cXON_XOFF_OUT", sep);
1288                 sep = '|';
1289         }
1290         if (self->settings.flow_control & IRCOMM_RTS_CTS_IN) {
1291                 seq_printf(m, "%cRTS_CTS_IN", sep);
1292                 sep = '|';
1293         }
1294         if (self->settings.flow_control & IRCOMM_RTS_CTS_OUT) {
1295                 seq_printf(m, "%cRTS_CTS_OUT", sep);
1296                 sep = '|';
1297         }
1298         if (self->settings.flow_control & IRCOMM_DSR_DTR_IN) {
1299                 seq_printf(m, "%cDSR_DTR_IN", sep);
1300                 sep = '|';
1301         }
1302         if (self->settings.flow_control & IRCOMM_DSR_DTR_OUT) {
1303                 seq_printf(m, "%cDSR_DTR_OUT", sep);
1304                 sep = '|';
1305         }
1306         if (self->settings.flow_control & IRCOMM_ENQ_ACK_IN) {
1307                 seq_printf(m, "%cENQ_ACK_IN", sep);
1308                 sep = '|';
1309         }
1310         if (self->settings.flow_control & IRCOMM_ENQ_ACK_OUT) {
1311                 seq_printf(m, "%cENQ_ACK_OUT", sep);
1312                 sep = '|';
1313         }
1314         seq_putc(m, '\n');
1315
1316         seq_puts(m, "Flags:");
1317         sep = ' ';
1318         if (tty_port_cts_enabled(&self->port)) {
1319                 seq_printf(m, "%cASYNC_CTS_FLOW", sep);
1320                 sep = '|';
1321         }
1322         if (self->port.flags & ASYNC_CHECK_CD) {
1323                 seq_printf(m, "%cASYNC_CHECK_CD", sep);
1324                 sep = '|';
1325         }
1326         if (self->port.flags & ASYNC_INITIALIZED) {
1327                 seq_printf(m, "%cASYNC_INITIALIZED", sep);
1328                 sep = '|';
1329         }
1330         if (self->port.flags & ASYNC_LOW_LATENCY) {
1331                 seq_printf(m, "%cASYNC_LOW_LATENCY", sep);
1332                 sep = '|';
1333         }
1334         if (self->port.flags & ASYNC_CLOSING) {
1335                 seq_printf(m, "%cASYNC_CLOSING", sep);
1336                 sep = '|';
1337         }
1338         if (self->port.flags & ASYNC_NORMAL_ACTIVE) {
1339                 seq_printf(m, "%cASYNC_NORMAL_ACTIVE", sep);
1340                 sep = '|';
1341         }
1342         seq_putc(m, '\n');
1343
1344         seq_printf(m, "Role: %s\n", self->client ? "client" : "server");
1345         seq_printf(m, "Open count: %d\n", self->port.count);
1346         seq_printf(m, "Max data size: %d\n", self->max_data_size);
1347         seq_printf(m, "Max header size: %d\n", self->max_header_size);
1348
1349         tty = tty_port_tty_get(&self->port);
1350         if (tty) {
1351                 seq_printf(m, "Hardware: %s\n",
1352                                tty->hw_stopped ? "Stopped" : "Running");
1353                 tty_kref_put(tty);
1354         }
1355 }
1356
1357 static int ircomm_tty_proc_show(struct seq_file *m, void *v)
1358 {
1359         struct ircomm_tty_cb *self;
1360         unsigned long flags;
1361
1362         spin_lock_irqsave(&ircomm_tty->hb_spinlock, flags);
1363
1364         self = (struct ircomm_tty_cb *) hashbin_get_first(ircomm_tty);
1365         while (self != NULL) {
1366                 if (self->magic != IRCOMM_TTY_MAGIC)
1367                         break;
1368
1369                 ircomm_tty_line_info(self, m);
1370                 self = (struct ircomm_tty_cb *) hashbin_get_next(ircomm_tty);
1371         }
1372         spin_unlock_irqrestore(&ircomm_tty->hb_spinlock, flags);
1373         return 0;
1374 }
1375
1376 static int ircomm_tty_proc_open(struct inode *inode, struct file *file)
1377 {
1378         return single_open(file, ircomm_tty_proc_show, NULL);
1379 }
1380
1381 static const struct file_operations ircomm_tty_proc_fops = {
1382         .owner          = THIS_MODULE,
1383         .open           = ircomm_tty_proc_open,
1384         .read           = seq_read,
1385         .llseek         = seq_lseek,
1386         .release        = single_release,
1387 };
1388 #endif /* CONFIG_PROC_FS */
1389
1390 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
1391 MODULE_DESCRIPTION("IrCOMM serial TTY driver");
1392 MODULE_LICENSE("GPL");
1393 MODULE_ALIAS_CHARDEV_MAJOR(IRCOMM_TTY_MAJOR);
1394
1395 module_init(ircomm_tty_init);
1396 module_exit(ircomm_tty_cleanup);