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