blob: 8eeaa8b7f4a63480e2423dde5e861c3309c8d54c [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*********************************************************************
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +09002 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 * 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
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +090012 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 * Copyright (c) 1999-2000 Dag Brattli, All Rights Reserved.
14 * Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com>
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +090015 *
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070019 * the License, or (at your option) any later version.
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +090020 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070021 * 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.
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +090025 *
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,
Linus Torvalds1da177e2005-04-16 15:20:36 -070029 * MA 02111-1307 USA
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +090030 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070031 ********************************************************************/
32
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include <linux/init.h>
34#include <linux/module.h>
35#include <linux/fs.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090036#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include <linux/sched.h>
Alexey Dobriyan3d304172009-03-31 15:19:22 -070038#include <linux/seq_file.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#include <linux/termios.h>
40#include <linux/tty.h>
Amit Virdicbfd1522011-05-12 01:04:40 +000041#include <linux/tty_flip.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#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
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);
David Howellsc4028952006-11-22 14:57:56 +000067static void ircomm_tty_do_softint(struct work_struct *work);
Linus Torvalds1da177e2005-04-16 15:20:36 -070068static 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);
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +090075static void ircomm_tty_flow_indication(void *instance, void *sap,
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 LOCAL_FLOW cmd);
77#ifdef CONFIG_PROC_FS
Alexey Dobriyan3d304172009-03-31 15:19:22 -070078static const struct file_operations ircomm_tty_proc_fops;
Linus Torvalds1da177e2005-04-16 15:20:36 -070079#endif /* CONFIG_PROC_FS */
80static struct tty_driver *driver;
81
Adrian Bunkd76081f2007-10-26 03:56:43 -070082static hashbin_t *ircomm_tty = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070083
Jeff Dikeb68e31d2006-10-02 02:17:18 -070084static const struct tty_operations ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 .open = ircomm_tty_open,
86 .close = ircomm_tty_close,
87 .write = ircomm_tty_write,
88 .write_room = ircomm_tty_write_room,
89 .chars_in_buffer = ircomm_tty_chars_in_buffer,
90 .flush_buffer = ircomm_tty_flush_buffer,
91 .ioctl = ircomm_tty_ioctl, /* ircomm_tty_ioctl.c */
92 .tiocmget = ircomm_tty_tiocmget, /* ircomm_tty_ioctl.c */
93 .tiocmset = ircomm_tty_tiocmset, /* ircomm_tty_ioctl.c */
94 .throttle = ircomm_tty_throttle,
95 .unthrottle = ircomm_tty_unthrottle,
96 .send_xchar = ircomm_tty_send_xchar,
97 .set_termios = ircomm_tty_set_termios,
98 .stop = ircomm_tty_stop,
99 .start = ircomm_tty_start,
100 .hangup = ircomm_tty_hangup,
101 .wait_until_sent = ircomm_tty_wait_until_sent,
102#ifdef CONFIG_PROC_FS
Alexey Dobriyan3d304172009-03-31 15:19:22 -0700103 .proc_fops = &ircomm_tty_proc_fops,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104#endif /* CONFIG_PROC_FS */
105};
106
107/*
108 * Function ircomm_tty_init()
109 *
110 * Init IrCOMM TTY layer/driver
111 *
112 */
113static int __init ircomm_tty_init(void)
114{
115 driver = alloc_tty_driver(IRCOMM_TTY_PORTS);
116 if (!driver)
117 return -ENOMEM;
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900118 ircomm_tty = hashbin_new(HB_LOCK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 if (ircomm_tty == NULL) {
Harvey Harrison0dc47872008-03-05 20:47:47 -0800120 IRDA_ERROR("%s(), can't allocate hashbin!\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 put_tty_driver(driver);
122 return -ENOMEM;
123 }
124
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 driver->driver_name = "ircomm";
126 driver->name = "ircomm";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 driver->major = IRCOMM_TTY_MAJOR;
128 driver->minor_start = IRCOMM_TTY_MINOR;
129 driver->type = TTY_DRIVER_TYPE_SERIAL;
130 driver->subtype = SERIAL_TYPE_NORMAL;
131 driver->init_termios = tty_std_termios;
132 driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
133 driver->flags = TTY_DRIVER_REAL_RAW;
134 tty_set_operations(driver, &ops);
135 if (tty_register_driver(driver)) {
136 IRDA_ERROR("%s(): Couldn't register serial driver\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800137 __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 put_tty_driver(driver);
139 return -1;
140 }
141 return 0;
142}
143
144static void __exit __ircomm_tty_cleanup(struct ircomm_tty_cb *self)
145{
Harvey Harrison0dc47872008-03-05 20:47:47 -0800146 IRDA_DEBUG(0, "%s()\n", __func__ );
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147
148 IRDA_ASSERT(self != NULL, return;);
149 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
150
151 ircomm_tty_shutdown(self);
152
153 self->magic = 0;
154 kfree(self);
155}
156
157/*
158 * Function ircomm_tty_cleanup ()
159 *
160 * Remove IrCOMM TTY layer/driver
161 *
162 */
163static void __exit ircomm_tty_cleanup(void)
164{
165 int ret;
166
Harvey Harrison0dc47872008-03-05 20:47:47 -0800167 IRDA_DEBUG(4, "%s()\n", __func__ );
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
169 ret = tty_unregister_driver(driver);
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900170 if (ret) {
171 IRDA_ERROR("%s(), failed to unregister driver\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800172 __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 return;
174 }
175
176 hashbin_delete(ircomm_tty, (FREE_FUNC) __ircomm_tty_cleanup);
177 put_tty_driver(driver);
178}
179
180/*
181 * Function ircomm_startup (self)
182 *
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900183 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 *
185 */
186static int ircomm_tty_startup(struct ircomm_tty_cb *self)
187{
188 notify_t notify;
189 int ret = -ENODEV;
190
Harvey Harrison0dc47872008-03-05 20:47:47 -0800191 IRDA_DEBUG(2, "%s()\n", __func__ );
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192
193 IRDA_ASSERT(self != NULL, return -1;);
194 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
195
196 /* Check if already open */
197 if (test_and_set_bit(ASYNC_B_INITIALIZED, &self->flags)) {
Harvey Harrison0dc47872008-03-05 20:47:47 -0800198 IRDA_DEBUG(2, "%s(), already open so break out!\n", __func__ );
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 return 0;
200 }
201
202 /* Register with IrCOMM */
203 irda_notify_init(&notify);
204 /* These callbacks we must handle ourselves */
205 notify.data_indication = ircomm_tty_data_indication;
206 notify.udata_indication = ircomm_tty_control_indication;
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900207 notify.flow_indication = ircomm_tty_flow_indication;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208
209 /* Use the ircomm_tty interface for these ones */
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900210 notify.disconnect_indication = ircomm_tty_disconnect_indication;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 notify.connect_confirm = ircomm_tty_connect_confirm;
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900212 notify.connect_indication = ircomm_tty_connect_indication;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 strlcpy(notify.name, "ircomm_tty", sizeof(notify.name));
214 notify.instance = self;
215
216 if (!self->ircomm) {
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900217 self->ircomm = ircomm_open(&notify, self->service_type,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 self->line);
219 }
220 if (!self->ircomm)
221 goto err;
222
223 self->slsap_sel = self->ircomm->slsap_sel;
224
225 /* Connect IrCOMM link with remote device */
226 ret = ircomm_tty_attach_cable(self);
227 if (ret < 0) {
Harvey Harrison0dc47872008-03-05 20:47:47 -0800228 IRDA_ERROR("%s(), error attaching cable!\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 goto err;
230 }
231
232 return 0;
233err:
234 clear_bit(ASYNC_B_INITIALIZED, &self->flags);
235 return ret;
236}
237
238/*
239 * Function ircomm_block_til_ready (self, filp)
240 *
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900241 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 *
243 */
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900244static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 struct file *filp)
246{
247 DECLARE_WAITQUEUE(wait, current);
248 int retval;
249 int do_clocal = 0, extra_count = 0;
250 unsigned long flags;
251 struct tty_struct *tty;
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900252
Harvey Harrison0dc47872008-03-05 20:47:47 -0800253 IRDA_DEBUG(2, "%s()\n", __func__ );
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254
255 tty = self->tty;
256
257 /*
258 * If non-blocking mode is set, or the port is not enabled,
259 * then make the check up front and then exit.
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900260 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
262 /* nonblock mode is set or port is not enabled */
263 self->flags |= ASYNC_NORMAL_ACTIVE;
Harvey Harrison0dc47872008-03-05 20:47:47 -0800264 IRDA_DEBUG(1, "%s(), O_NONBLOCK requested!\n", __func__ );
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 return 0;
266 }
267
268 if (tty->termios->c_cflag & CLOCAL) {
Harvey Harrison0dc47872008-03-05 20:47:47 -0800269 IRDA_DEBUG(1, "%s(), doing CLOCAL!\n", __func__ );
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 do_clocal = 1;
271 }
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900272
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 /* Wait for carrier detect and the line to become
274 * free (i.e., not in use by the callout). While we are in
275 * this loop, self->open_count is dropped by one, so that
276 * mgsl_close() knows when to free things. We restore it upon
277 * exit, either normal or abnormal.
278 */
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900279
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 retval = 0;
Jiri Slabya3cc9fc2012-06-04 13:35:16 +0200281 add_wait_queue(&self->port.open_wait, &wait);
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900282
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 IRDA_DEBUG(2, "%s(%d):block_til_ready before block on %s open_count=%d\n",
284 __FILE__,__LINE__, tty->driver->name, self->open_count );
285
286 /* As far as I can see, we protect open_count - Jean II */
287 spin_lock_irqsave(&self->spinlock, flags);
288 if (!tty_hung_up_p(filp)) {
289 extra_count = 1;
290 self->open_count--;
291 }
292 spin_unlock_irqrestore(&self->spinlock, flags);
293 self->blocked_open++;
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900294
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 while (1) {
296 if (tty->termios->c_cflag & CBAUD) {
297 /* Here, we use to lock those two guys, but
298 * as ircomm_param_request() does it itself,
299 * I don't see the point (and I see the deadlock).
300 * Jean II */
301 self->settings.dte |= IRCOMM_RTS + IRCOMM_DTR;
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900302
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 ircomm_param_request(self, IRCOMM_DTE, TRUE);
304 }
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900305
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 current->state = TASK_INTERRUPTIBLE;
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900307
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 if (tty_hung_up_p(filp) ||
309 !test_bit(ASYNC_B_INITIALIZED, &self->flags)) {
310 retval = (self->flags & ASYNC_HUP_NOTIFY) ?
311 -EAGAIN : -ERESTARTSYS;
312 break;
313 }
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900314
315 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 * Check if link is ready now. Even if CLOCAL is
317 * specified, we cannot return before the IrCOMM link is
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900318 * ready
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 */
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900320 if (!test_bit(ASYNC_B_CLOSING, &self->flags) &&
321 (do_clocal || (self->settings.dce & IRCOMM_CD)) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 self->state == IRCOMM_TTY_READY)
323 {
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900324 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 }
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900326
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 if (signal_pending(current)) {
328 retval = -ERESTARTSYS;
329 break;
330 }
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900331
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 IRDA_DEBUG(1, "%s(%d):block_til_ready blocking on %s open_count=%d\n",
333 __FILE__,__LINE__, tty->driver->name, self->open_count );
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900334
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 schedule();
336 }
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900337
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 __set_current_state(TASK_RUNNING);
Jiri Slabya3cc9fc2012-06-04 13:35:16 +0200339 remove_wait_queue(&self->port.open_wait, &wait);
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900340
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 if (extra_count) {
342 /* ++ is not atomic, so this should be protected - Jean II */
343 spin_lock_irqsave(&self->spinlock, flags);
344 self->open_count++;
345 spin_unlock_irqrestore(&self->spinlock, flags);
346 }
347 self->blocked_open--;
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900348
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 IRDA_DEBUG(1, "%s(%d):block_til_ready after blocking on %s open_count=%d\n",
350 __FILE__,__LINE__, tty->driver->name, self->open_count);
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900351
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 if (!retval)
353 self->flags |= ASYNC_NORMAL_ACTIVE;
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900354
355 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356}
357
358/*
359 * Function ircomm_tty_open (tty, filp)
360 *
361 * This routine is called when a particular tty device is opened. This
362 * routine is mandatory; if this routine is not filled in, the attempted
363 * open will fail with ENODEV.
364 */
365static int ircomm_tty_open(struct tty_struct *tty, struct file *filp)
366{
367 struct ircomm_tty_cb *self;
Jiri Slaby410235f2012-03-05 14:52:01 +0100368 unsigned int line = tty->index;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 unsigned long flags;
370 int ret;
371
Harvey Harrison0dc47872008-03-05 20:47:47 -0800372 IRDA_DEBUG(2, "%s()\n", __func__ );
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 /* Check if instance already exists */
375 self = hashbin_lock_find(ircomm_tty, line, NULL);
376 if (!self) {
377 /* No, so make new instance */
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700378 self = kzalloc(sizeof(struct ircomm_tty_cb), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 if (self == NULL) {
Harvey Harrison0dc47872008-03-05 20:47:47 -0800380 IRDA_ERROR("%s(), kmalloc failed!\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 return -ENOMEM;
382 }
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900383
Jiri Slabya3cc9fc2012-06-04 13:35:16 +0200384 tty_port_init(&self->port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 self->magic = IRCOMM_TTY_MAGIC;
386 self->flow = FLOW_STOP;
387
388 self->line = line;
David Howellsc4028952006-11-22 14:57:56 +0000389 INIT_WORK(&self->tqueue, ircomm_tty_do_softint);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 self->max_header_size = IRCOMM_TTY_HDR_UNINITIALISED;
391 self->max_data_size = IRCOMM_TTY_DATA_UNINITIALISED;
392 self->close_delay = 5*HZ/10;
393 self->closing_wait = 30*HZ;
394
395 /* Init some important stuff */
396 init_timer(&self->watchdog_timer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 spin_lock_init(&self->spinlock);
398
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900399 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 * Force TTY into raw mode by default which is usually what
401 * we want for IrCOMM and IrLPT. This way applications will
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900402 * not have to twiddle with printcap etc.
Alan Coxad36b882009-01-02 13:50:20 +0000403 *
404 * Note this is completely usafe and doesn't work properly
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 */
406 tty->termios->c_iflag = 0;
407 tty->termios->c_oflag = 0;
408
409 /* Insert into hash */
Jiri Slabya3cc9fc2012-06-04 13:35:16 +0200410 /* FIXME there is a window from find to here */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 hashbin_insert(ircomm_tty, (irda_queue_t *) self, line, NULL);
412 }
413 /* ++ is not atomic, so this should be protected - Jean II */
414 spin_lock_irqsave(&self->spinlock, flags);
415 self->open_count++;
416
417 tty->driver_data = self;
418 self->tty = tty;
419 spin_unlock_irqrestore(&self->spinlock, flags);
420
Harvey Harrison0dc47872008-03-05 20:47:47 -0800421 IRDA_DEBUG(1, "%s(), %s%d, count = %d\n", __func__ , tty->driver->name,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 self->line, self->open_count);
423
424 /* Not really used by us, but lets do it anyway */
425 self->tty->low_latency = (self->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
426
427 /*
428 * If the port is the middle of closing, bail out now
429 */
430 if (tty_hung_up_p(filp) ||
431 test_bit(ASYNC_B_CLOSING, &self->flags)) {
432
433 /* Hm, why are we blocking on ASYNC_CLOSING if we
434 * do return -EAGAIN/-ERESTARTSYS below anyway?
435 * IMHO it's either not needed in the first place
436 * or for some reason we need to make sure the async
437 * closing has been finished - if so, wouldn't we
438 * probably better sleep uninterruptible?
439 */
440
Jiri Slabya3cc9fc2012-06-04 13:35:16 +0200441 if (wait_event_interruptible(self->port.close_wait,
442 !test_bit(ASYNC_B_CLOSING, &self->flags))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 IRDA_WARNING("%s - got signal while blocking on ASYNC_CLOSING!\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800444 __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 return -ERESTARTSYS;
446 }
447
448#ifdef SERIAL_DO_RESTART
Eric Dumazeta02cec22010-09-22 20:43:57 +0000449 return (self->flags & ASYNC_HUP_NOTIFY) ?
450 -EAGAIN : -ERESTARTSYS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451#else
452 return -EAGAIN;
453#endif
454 }
455
456 /* Check if this is a "normal" ircomm device, or an irlpt device */
457 if (line < 0x10) {
458 self->service_type = IRCOMM_3_WIRE | IRCOMM_9_WIRE;
459 self->settings.service_type = IRCOMM_9_WIRE; /* 9 wire as default */
460 /* Jan Kiszka -> add DSR/RI -> Conform to IrCOMM spec */
461 self->settings.dce = IRCOMM_CTS | IRCOMM_CD | IRCOMM_DSR | IRCOMM_RI; /* Default line settings */
Harvey Harrison0dc47872008-03-05 20:47:47 -0800462 IRDA_DEBUG(2, "%s(), IrCOMM device\n", __func__ );
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 } else {
Harvey Harrison0dc47872008-03-05 20:47:47 -0800464 IRDA_DEBUG(2, "%s(), IrLPT device\n", __func__ );
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 self->service_type = IRCOMM_3_WIRE_RAW;
466 self->settings.service_type = IRCOMM_3_WIRE_RAW; /* Default */
467 }
468
469 ret = ircomm_tty_startup(self);
470 if (ret)
471 return ret;
472
473 ret = ircomm_tty_block_til_ready(self, filp);
474 if (ret) {
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900475 IRDA_DEBUG(2,
Harvey Harrison0dc47872008-03-05 20:47:47 -0800476 "%s(), returning after block_til_ready with %d\n", __func__ ,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 ret);
478
479 return ret;
480 }
481 return 0;
482}
483
484/*
485 * Function ircomm_tty_close (tty, filp)
486 *
487 * This routine is called when a particular tty device is closed.
488 *
489 */
490static void ircomm_tty_close(struct tty_struct *tty, struct file *filp)
491{
492 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
493 unsigned long flags;
494
Harvey Harrison0dc47872008-03-05 20:47:47 -0800495 IRDA_DEBUG(0, "%s()\n", __func__ );
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 IRDA_ASSERT(self != NULL, return;);
498 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
499
500 spin_lock_irqsave(&self->spinlock, flags);
501
502 if (tty_hung_up_p(filp)) {
503 spin_unlock_irqrestore(&self->spinlock, flags);
504
Harvey Harrison0dc47872008-03-05 20:47:47 -0800505 IRDA_DEBUG(0, "%s(), returning 1\n", __func__ );
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 return;
507 }
508
509 if ((tty->count == 1) && (self->open_count != 1)) {
510 /*
511 * Uh, oh. tty->count is 1, which means that the tty
512 * structure will be freed. state->count should always
513 * be one in these conditions. If it's greater than
514 * one, we've got real problems, since it means the
515 * serial port won't be shutdown.
516 */
517 IRDA_DEBUG(0, "%s(), bad serial port count; "
Harvey Harrison0dc47872008-03-05 20:47:47 -0800518 "tty->count is 1, state->count is %d\n", __func__ ,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 self->open_count);
520 self->open_count = 1;
521 }
522
523 if (--self->open_count < 0) {
524 IRDA_ERROR("%s(), bad serial port count for ttys%d: %d\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800525 __func__, self->line, self->open_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526 self->open_count = 0;
527 }
528 if (self->open_count) {
529 spin_unlock_irqrestore(&self->spinlock, flags);
530
Harvey Harrison0dc47872008-03-05 20:47:47 -0800531 IRDA_DEBUG(0, "%s(), open count > 0\n", __func__ );
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 return;
533 }
534
535 /* Hum... Should be test_and_set_bit ??? - Jean II */
536 set_bit(ASYNC_B_CLOSING, &self->flags);
537
538 /* We need to unlock here (we were unlocking at the end of this
539 * function), because tty_wait_until_sent() may schedule.
540 * I don't know if the rest should be protected somehow,
541 * so someone should check. - Jean II */
542 spin_unlock_irqrestore(&self->spinlock, flags);
543
544 /*
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900545 * Now we wait for the transmit buffer to clear; and we notify
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 * the line discipline to only process XON/XOFF characters.
547 */
548 tty->closing = 1;
549 if (self->closing_wait != ASYNC_CLOSING_WAIT_NONE)
Jiri Slaby0b058352011-08-25 15:12:08 +0200550 tty_wait_until_sent_from_close(tty, self->closing_wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551
552 ircomm_tty_shutdown(self);
553
Alan Coxf34d7a52008-04-30 00:54:13 -0700554 tty_driver_flush_buffer(tty);
555 tty_ldisc_flush(tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556
557 tty->closing = 0;
558 self->tty = NULL;
559
560 if (self->blocked_open) {
Nishanth Aravamudan121caf52005-09-12 14:15:34 -0700561 if (self->close_delay)
562 schedule_timeout_interruptible(self->close_delay);
Jiri Slabya3cc9fc2012-06-04 13:35:16 +0200563 wake_up_interruptible(&self->port.open_wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 }
565
566 self->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
Jiri Slabya3cc9fc2012-06-04 13:35:16 +0200567 wake_up_interruptible(&self->port.close_wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568}
569
570/*
571 * Function ircomm_tty_flush_buffer (tty)
572 *
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900573 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 *
575 */
576static void ircomm_tty_flush_buffer(struct tty_struct *tty)
577{
578 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
579
580 IRDA_ASSERT(self != NULL, return;);
581 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
582
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900583 /*
584 * Let do_softint() do this to avoid race condition with
585 * do_softint() ;-)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586 */
587 schedule_work(&self->tqueue);
588}
589
590/*
David Howellsc4028952006-11-22 14:57:56 +0000591 * Function ircomm_tty_do_softint (work)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 *
593 * We use this routine to give the write wakeup to the user at at a
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900594 * safe time (as fast as possible after write have completed). This
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595 * can be compared to the Tx interrupt.
596 */
David Howellsc4028952006-11-22 14:57:56 +0000597static void ircomm_tty_do_softint(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598{
David Howellsc4028952006-11-22 14:57:56 +0000599 struct ircomm_tty_cb *self =
600 container_of(work, struct ircomm_tty_cb, tqueue);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 struct tty_struct *tty;
602 unsigned long flags;
603 struct sk_buff *skb, *ctrl_skb;
604
Harvey Harrison0dc47872008-03-05 20:47:47 -0800605 IRDA_DEBUG(2, "%s()\n", __func__ );
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606
607 if (!self || self->magic != IRCOMM_TTY_MAGIC)
608 return;
609
610 tty = self->tty;
611 if (!tty)
612 return;
613
614 /* Unlink control buffer */
615 spin_lock_irqsave(&self->spinlock, flags);
616
617 ctrl_skb = self->ctrl_skb;
618 self->ctrl_skb = NULL;
619
620 spin_unlock_irqrestore(&self->spinlock, flags);
621
622 /* Flush control buffer if any */
623 if(ctrl_skb) {
624 if(self->flow == FLOW_START)
625 ircomm_control_request(self->ircomm, ctrl_skb);
626 /* Drop reference count - see ircomm_ttp_data_request(). */
627 dev_kfree_skb(ctrl_skb);
628 }
629
630 if (tty->hw_stopped)
631 return;
632
633 /* Unlink transmit buffer */
634 spin_lock_irqsave(&self->spinlock, flags);
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900635
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 skb = self->tx_skb;
637 self->tx_skb = NULL;
638
639 spin_unlock_irqrestore(&self->spinlock, flags);
640
641 /* Flush transmit buffer if any */
642 if (skb) {
643 ircomm_tty_do_event(self, IRCOMM_TTY_DATA_REQUEST, skb, NULL);
644 /* Drop reference count - see ircomm_ttp_data_request(). */
645 dev_kfree_skb(skb);
646 }
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900647
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 /* Check if user (still) wants to be waken up */
Alan Coxa352def2008-07-16 21:53:12 +0100649 tty_wakeup(tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650}
651
652/*
653 * Function ircomm_tty_write (tty, buf, count)
654 *
655 * This routine is called by the kernel to write a series of characters
656 * to the tty device. The characters may come from user space or kernel
657 * space. This routine will return the number of characters actually
658 * accepted for writing. This routine is mandatory.
659 */
660static int ircomm_tty_write(struct tty_struct *tty,
661 const unsigned char *buf, int count)
662{
663 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
664 unsigned long flags;
665 struct sk_buff *skb;
666 int tailroom = 0;
667 int len = 0;
668 int size;
669
Harvey Harrison0dc47872008-03-05 20:47:47 -0800670 IRDA_DEBUG(2, "%s(), count=%d, hw_stopped=%d\n", __func__ , count,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671 tty->hw_stopped);
672
673 IRDA_ASSERT(self != NULL, return -1;);
674 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
675
676 /* We may receive packets from the TTY even before we have finished
677 * our setup. Not cool.
678 * The problem is that we don't know the final header and data size
679 * to create the proper skb, so any skb we would create would have
680 * bogus header and data size, so need care.
681 * We use a bogus header size to safely detect this condition.
682 * Another problem is that hw_stopped was set to 0 way before it
683 * should be, so we would drop this skb. It should now be fixed.
684 * One option is to not accept data until we are properly setup.
685 * But, I suspect that when it happens, the ppp line discipline
686 * just "drops" the data, which might screw up connect scripts.
687 * The second option is to create a "safe skb", with large header
688 * and small size (see ircomm_tty_open() for values).
689 * We just need to make sure that when the real values get filled,
690 * we don't mess up the original "safe skb" (see tx_data_size).
691 * Jean II */
692 if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) {
Harvey Harrison0dc47872008-03-05 20:47:47 -0800693 IRDA_DEBUG(1, "%s() : not initialised\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694#ifdef IRCOMM_NO_TX_BEFORE_INIT
695 /* We didn't consume anything, TTY will retry */
696 return 0;
697#endif
698 }
699
700 if (count < 1)
701 return 0;
702
703 /* Protect our manipulation of self->tx_skb and related */
704 spin_lock_irqsave(&self->spinlock, flags);
705
706 /* Fetch current transmit buffer */
707 skb = self->tx_skb;
708
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900709 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 * Send out all the data we get, possibly as multiple fragmented
711 * frames, but this will only happen if the data is larger than the
712 * max data size. The normal case however is just the opposite, and
713 * this function may be called multiple times, and will then actually
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900714 * defragment the data and send it out as one packet as soon as
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715 * possible, but at a safer point in time
716 */
717 while (count) {
718 size = count;
719
720 /* Adjust data size to the max data size */
721 if (size > self->max_data_size)
722 size = self->max_data_size;
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900723
724 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 * Do we already have a buffer ready for transmit, or do
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900726 * we need to allocate a new frame
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 */
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900728 if (skb) {
729 /*
730 * Any room for more data at the end of the current
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731 * transmit buffer? Cannot use skb_tailroom, since
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900732 * dev_alloc_skb gives us a larger skb than we
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 * requested
734 * Note : use tx_data_size, because max_data_size
735 * may have changed and we don't want to overwrite
736 * the skb. - Jean II
737 */
738 if ((tailroom = (self->tx_data_size - skb->len)) > 0) {
739 /* Adjust data to tailroom */
740 if (size > tailroom)
741 size = tailroom;
742 } else {
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900743 /*
744 * Current transmit frame is full, so break
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745 * out, so we can send it as soon as possible
746 */
747 break;
748 }
749 } else {
750 /* Prepare a full sized frame */
Samuel Ortiz485fb2c2006-07-21 14:50:41 -0700751 skb = alloc_skb(self->max_data_size+
752 self->max_header_size,
753 GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754 if (!skb) {
755 spin_unlock_irqrestore(&self->spinlock, flags);
756 return -ENOBUFS;
757 }
758 skb_reserve(skb, self->max_header_size);
759 self->tx_skb = skb;
760 /* Remember skb size because max_data_size may
761 * change later on - Jean II */
762 self->tx_data_size = self->max_data_size;
763 }
764
765 /* Copy data */
766 memcpy(skb_put(skb,size), buf + len, size);
767
768 count -= size;
769 len += size;
770 }
771
772 spin_unlock_irqrestore(&self->spinlock, flags);
773
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900774 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775 * Schedule a new thread which will transmit the frame as soon
776 * as possible, but at a safe point in time. We do this so the
777 * "user" can give us data multiple times, as PPP does (because of
778 * its 256 byte tx buffer). We will then defragment and send out
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900779 * all this data as one single packet.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 */
781 schedule_work(&self->tqueue);
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900782
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783 return len;
784}
785
786/*
787 * Function ircomm_tty_write_room (tty)
788 *
789 * This routine returns the numbers of characters the tty driver will
790 * accept for queuing to be written. This number is subject to change as
791 * output buffers get emptied, or if the output flow control is acted.
792 */
793static int ircomm_tty_write_room(struct tty_struct *tty)
794{
795 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
796 unsigned long flags;
797 int ret;
798
799 IRDA_ASSERT(self != NULL, return -1;);
800 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
801
802#ifdef IRCOMM_NO_TX_BEFORE_INIT
803 /* max_header_size tells us if the channel is initialised or not. */
804 if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED)
805 /* Don't bother us yet */
806 return 0;
807#endif
808
809 /* Check if we are allowed to transmit any data.
810 * hw_stopped is the regular flow control.
811 * Jean II */
812 if (tty->hw_stopped)
813 ret = 0;
814 else {
815 spin_lock_irqsave(&self->spinlock, flags);
816 if (self->tx_skb)
817 ret = self->tx_data_size - self->tx_skb->len;
818 else
819 ret = self->max_data_size;
820 spin_unlock_irqrestore(&self->spinlock, flags);
821 }
Harvey Harrison0dc47872008-03-05 20:47:47 -0800822 IRDA_DEBUG(2, "%s(), ret=%d\n", __func__ , ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823
824 return ret;
825}
826
827/*
828 * Function ircomm_tty_wait_until_sent (tty, timeout)
829 *
830 * This routine waits until the device has written out all of the
831 * characters in its transmitter FIFO.
832 */
833static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout)
834{
835 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
836 unsigned long orig_jiffies, poll_time;
837 unsigned long flags;
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900838
Harvey Harrison0dc47872008-03-05 20:47:47 -0800839 IRDA_DEBUG(2, "%s()\n", __func__ );
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840
841 IRDA_ASSERT(self != NULL, return;);
842 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
843
844 orig_jiffies = jiffies;
845
846 /* Set poll time to 200 ms */
847 poll_time = IRDA_MIN(timeout, msecs_to_jiffies(200));
848
849 spin_lock_irqsave(&self->spinlock, flags);
850 while (self->tx_skb && self->tx_skb->len) {
851 spin_unlock_irqrestore(&self->spinlock, flags);
Nishanth Aravamudan121caf52005-09-12 14:15:34 -0700852 schedule_timeout_interruptible(poll_time);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853 spin_lock_irqsave(&self->spinlock, flags);
854 if (signal_pending(current))
855 break;
856 if (timeout && time_after(jiffies, orig_jiffies + timeout))
857 break;
858 }
859 spin_unlock_irqrestore(&self->spinlock, flags);
860 current->state = TASK_RUNNING;
861}
862
863/*
864 * Function ircomm_tty_throttle (tty)
865 *
866 * This routine notifies the tty driver that input buffers for the line
867 * discipline are close to full, and it should somehow signal that no
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900868 * more characters should be sent to the tty.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869 */
870static void ircomm_tty_throttle(struct tty_struct *tty)
871{
872 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
873
Harvey Harrison0dc47872008-03-05 20:47:47 -0800874 IRDA_DEBUG(2, "%s()\n", __func__ );
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875
876 IRDA_ASSERT(self != NULL, return;);
877 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
878
879 /* Software flow control? */
880 if (I_IXOFF(tty))
881 ircomm_tty_send_xchar(tty, STOP_CHAR(tty));
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900882
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883 /* Hardware flow control? */
884 if (tty->termios->c_cflag & CRTSCTS) {
885 self->settings.dte &= ~IRCOMM_RTS;
886 self->settings.dte |= IRCOMM_DELTA_RTS;
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900887
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888 ircomm_param_request(self, IRCOMM_DTE, TRUE);
889 }
890
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900891 ircomm_flow_request(self->ircomm, FLOW_STOP);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892}
893
894/*
895 * Function ircomm_tty_unthrottle (tty)
896 *
897 * This routine notifies the tty drivers that it should signals that
898 * characters can now be sent to the tty without fear of overrunning the
899 * input buffers of the line disciplines.
900 */
901static void ircomm_tty_unthrottle(struct tty_struct *tty)
902{
903 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
904
Harvey Harrison0dc47872008-03-05 20:47:47 -0800905 IRDA_DEBUG(2, "%s()\n", __func__ );
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906
907 IRDA_ASSERT(self != NULL, return;);
908 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
909
910 /* Using software flow control? */
911 if (I_IXOFF(tty)) {
912 ircomm_tty_send_xchar(tty, START_CHAR(tty));
913 }
914
915 /* Using hardware flow control? */
916 if (tty->termios->c_cflag & CRTSCTS) {
917 self->settings.dte |= (IRCOMM_RTS|IRCOMM_DELTA_RTS);
918
919 ircomm_param_request(self, IRCOMM_DTE, TRUE);
Harvey Harrison0dc47872008-03-05 20:47:47 -0800920 IRDA_DEBUG(1, "%s(), FLOW_START\n", __func__ );
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921 }
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900922 ircomm_flow_request(self->ircomm, FLOW_START);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923}
924
925/*
926 * Function ircomm_tty_chars_in_buffer (tty)
927 *
928 * Indicates if there are any data in the buffer
929 *
930 */
931static int ircomm_tty_chars_in_buffer(struct tty_struct *tty)
932{
933 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
934 unsigned long flags;
935 int len = 0;
936
937 IRDA_ASSERT(self != NULL, return -1;);
938 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
939
940 spin_lock_irqsave(&self->spinlock, flags);
941
942 if (self->tx_skb)
943 len = self->tx_skb->len;
944
945 spin_unlock_irqrestore(&self->spinlock, flags);
946
947 return len;
948}
949
950static void ircomm_tty_shutdown(struct ircomm_tty_cb *self)
951{
952 unsigned long flags;
953
954 IRDA_ASSERT(self != NULL, return;);
955 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
956
Harvey Harrison0dc47872008-03-05 20:47:47 -0800957 IRDA_DEBUG(0, "%s()\n", __func__ );
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958
959 if (!test_and_clear_bit(ASYNC_B_INITIALIZED, &self->flags))
960 return;
961
962 ircomm_tty_detach_cable(self);
963
964 spin_lock_irqsave(&self->spinlock, flags);
965
966 del_timer(&self->watchdog_timer);
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900967
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968 /* Free parameter buffer */
969 if (self->ctrl_skb) {
970 dev_kfree_skb(self->ctrl_skb);
971 self->ctrl_skb = NULL;
972 }
973
974 /* Free transmit buffer */
975 if (self->tx_skb) {
976 dev_kfree_skb(self->tx_skb);
977 self->tx_skb = NULL;
978 }
979
980 if (self->ircomm) {
981 ircomm_close(self->ircomm);
982 self->ircomm = NULL;
983 }
984
985 spin_unlock_irqrestore(&self->spinlock, flags);
986}
987
988/*
989 * Function ircomm_tty_hangup (tty)
990 *
991 * This routine notifies the tty driver that it should hangup the tty
992 * device.
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900993 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994 */
995static void ircomm_tty_hangup(struct tty_struct *tty)
996{
997 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
998 unsigned long flags;
999
Harvey Harrison0dc47872008-03-05 20:47:47 -08001000 IRDA_DEBUG(0, "%s()\n", __func__ );
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001
1002 IRDA_ASSERT(self != NULL, return;);
1003 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1004
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005 /* ircomm_tty_flush_buffer(tty); */
1006 ircomm_tty_shutdown(self);
1007
1008 /* I guess we need to lock here - Jean II */
1009 spin_lock_irqsave(&self->spinlock, flags);
1010 self->flags &= ~ASYNC_NORMAL_ACTIVE;
1011 self->tty = NULL;
1012 self->open_count = 0;
1013 spin_unlock_irqrestore(&self->spinlock, flags);
1014
Jiri Slabya3cc9fc2012-06-04 13:35:16 +02001015 wake_up_interruptible(&self->port.open_wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016}
1017
1018/*
1019 * Function ircomm_tty_send_xchar (tty, ch)
1020 *
1021 * This routine is used to send a high-priority XON/XOFF character to
1022 * the device.
1023 */
1024static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch)
1025{
Harvey Harrison0dc47872008-03-05 20:47:47 -08001026 IRDA_DEBUG(0, "%s(), not impl\n", __func__ );
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027}
1028
1029/*
1030 * Function ircomm_tty_start (tty)
1031 *
1032 * This routine notifies the tty driver that it resume sending
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +09001033 * characters to the tty device.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034 */
1035void ircomm_tty_start(struct tty_struct *tty)
1036{
1037 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1038
1039 ircomm_flow_request(self->ircomm, FLOW_START);
1040}
1041
1042/*
1043 * Function ircomm_tty_stop (tty)
1044 *
1045 * This routine notifies the tty driver that it should stop outputting
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +09001046 * characters to the tty device.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047 */
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +09001048static void ircomm_tty_stop(struct tty_struct *tty)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049{
1050 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1051
1052 IRDA_ASSERT(self != NULL, return;);
1053 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1054
1055 ircomm_flow_request(self->ircomm, FLOW_STOP);
1056}
1057
1058/*
1059 * Function ircomm_check_modem_status (self)
1060 *
1061 * Check for any changes in the DCE's line settings. This function should
1062 * be called whenever the dce parameter settings changes, to update the
1063 * flow control settings and other things
1064 */
1065void ircomm_tty_check_modem_status(struct ircomm_tty_cb *self)
1066{
1067 struct tty_struct *tty;
1068 int status;
1069
Harvey Harrison0dc47872008-03-05 20:47:47 -08001070 IRDA_DEBUG(0, "%s()\n", __func__ );
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071
1072 IRDA_ASSERT(self != NULL, return;);
1073 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1074
1075 tty = self->tty;
1076
1077 status = self->settings.dce;
1078
1079 if (status & IRCOMM_DCE_DELTA_ANY) {
1080 /*wake_up_interruptible(&self->delta_msr_wait);*/
1081 }
1082 if ((self->flags & ASYNC_CHECK_CD) && (status & IRCOMM_DELTA_CD)) {
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +09001083 IRDA_DEBUG(2,
Harvey Harrison0dc47872008-03-05 20:47:47 -08001084 "%s(), ircomm%d CD now %s...\n", __func__ , self->line,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085 (status & IRCOMM_CD) ? "on" : "off");
1086
1087 if (status & IRCOMM_CD) {
Jiri Slabya3cc9fc2012-06-04 13:35:16 +02001088 wake_up_interruptible(&self->port.open_wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089 } else {
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +09001090 IRDA_DEBUG(2,
Harvey Harrison0dc47872008-03-05 20:47:47 -08001091 "%s(), Doing serial hangup..\n", __func__ );
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092 if (tty)
1093 tty_hangup(tty);
1094
1095 /* Hangup will remote the tty, so better break out */
1096 return;
1097 }
1098 }
1099 if (self->flags & ASYNC_CTS_FLOW) {
1100 if (tty->hw_stopped) {
1101 if (status & IRCOMM_CTS) {
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +09001102 IRDA_DEBUG(2,
Harvey Harrison0dc47872008-03-05 20:47:47 -08001103 "%s(), CTS tx start...\n", __func__ );
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104 tty->hw_stopped = 0;
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +09001105
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106 /* Wake up processes blocked on open */
Jiri Slabya3cc9fc2012-06-04 13:35:16 +02001107 wake_up_interruptible(&self->port.open_wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108
1109 schedule_work(&self->tqueue);
1110 return;
1111 }
1112 } else {
1113 if (!(status & IRCOMM_CTS)) {
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +09001114 IRDA_DEBUG(2,
Harvey Harrison0dc47872008-03-05 20:47:47 -08001115 "%s(), CTS tx stop...\n", __func__ );
Linus Torvalds1da177e2005-04-16 15:20:36 -07001116 tty->hw_stopped = 1;
1117 }
1118 }
1119 }
1120}
1121
1122/*
1123 * Function ircomm_tty_data_indication (instance, sap, skb)
1124 *
1125 * Handle incoming data, and deliver it to the line discipline
1126 *
1127 */
1128static int ircomm_tty_data_indication(void *instance, void *sap,
1129 struct sk_buff *skb)
1130{
1131 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1132
Harvey Harrison0dc47872008-03-05 20:47:47 -08001133 IRDA_DEBUG(2, "%s()\n", __func__ );
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +09001134
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135 IRDA_ASSERT(self != NULL, return -1;);
1136 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1137 IRDA_ASSERT(skb != NULL, return -1;);
1138
1139 if (!self->tty) {
Harvey Harrison0dc47872008-03-05 20:47:47 -08001140 IRDA_DEBUG(0, "%s(), no tty!\n", __func__ );
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141 return 0;
1142 }
1143
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +09001144 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001145 * If we receive data when hardware is stopped then something is wrong.
1146 * We try to poll the peers line settings to check if we are up todate.
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +09001147 * Devices like WinCE can do this, and since they don't send any
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148 * params, we can just as well declare the hardware for running.
1149 */
1150 if (self->tty->hw_stopped && (self->flow == FLOW_START)) {
Harvey Harrison0dc47872008-03-05 20:47:47 -08001151 IRDA_DEBUG(0, "%s(), polling for line settings!\n", __func__ );
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152 ircomm_param_request(self, IRCOMM_POLL, TRUE);
1153
1154 /* We can just as well declare the hardware for running */
1155 ircomm_tty_send_initial_parameters(self);
1156 ircomm_tty_link_established(self);
1157 }
1158
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +09001159 /*
Amit Virdicbfd1522011-05-12 01:04:40 +00001160 * Use flip buffer functions since the code may be called from interrupt
1161 * context
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162 */
Amit Virdicbfd1522011-05-12 01:04:40 +00001163 tty_insert_flip_string(self->tty, skb->data, skb->len);
1164 tty_flip_buffer_push(self->tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165
1166 /* No need to kfree_skb - see ircomm_ttp_data_indication() */
1167
1168 return 0;
1169}
1170
1171/*
1172 * Function ircomm_tty_control_indication (instance, sap, skb)
1173 *
1174 * Parse all incoming parameters (easy!)
1175 *
1176 */
1177static int ircomm_tty_control_indication(void *instance, void *sap,
1178 struct sk_buff *skb)
1179{
1180 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1181 int clen;
1182
Harvey Harrison0dc47872008-03-05 20:47:47 -08001183 IRDA_DEBUG(4, "%s()\n", __func__ );
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +09001184
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185 IRDA_ASSERT(self != NULL, return -1;);
1186 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1187 IRDA_ASSERT(skb != NULL, return -1;);
1188
1189 clen = skb->data[0];
1190
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +09001191 irda_param_extract_all(self, skb->data+1, IRDA_MIN(skb->len-1, clen),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192 &ircomm_param_info);
1193
1194 /* No need to kfree_skb - see ircomm_control_indication() */
1195
1196 return 0;
1197}
1198
1199/*
1200 * Function ircomm_tty_flow_indication (instance, sap, cmd)
1201 *
1202 * This function is called by IrTTP when it wants us to slow down the
1203 * transmission of data. We just mark the hardware as stopped, and wait
1204 * for IrTTP to notify us that things are OK again.
1205 */
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +09001206static void ircomm_tty_flow_indication(void *instance, void *sap,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207 LOCAL_FLOW cmd)
1208{
1209 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1210 struct tty_struct *tty;
1211
1212 IRDA_ASSERT(self != NULL, return;);
1213 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1214
1215 tty = self->tty;
1216
1217 switch (cmd) {
1218 case FLOW_START:
Harvey Harrison0dc47872008-03-05 20:47:47 -08001219 IRDA_DEBUG(2, "%s(), hw start!\n", __func__ );
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220 tty->hw_stopped = 0;
1221
1222 /* ircomm_tty_do_softint will take care of the rest */
1223 schedule_work(&self->tqueue);
1224 break;
1225 default: /* If we get here, something is very wrong, better stop */
1226 case FLOW_STOP:
Harvey Harrison0dc47872008-03-05 20:47:47 -08001227 IRDA_DEBUG(2, "%s(), hw stopped!\n", __func__ );
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228 tty->hw_stopped = 1;
1229 break;
1230 }
1231 self->flow = cmd;
1232}
1233
Pavel Emelyanov92b05e132007-12-05 02:18:48 -08001234#ifdef CONFIG_PROC_FS
Alexey Dobriyan3d304172009-03-31 15:19:22 -07001235static void ircomm_tty_line_info(struct ircomm_tty_cb *self, struct seq_file *m)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236{
Alexey Dobriyan3d304172009-03-31 15:19:22 -07001237 char sep;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238
Alexey Dobriyan3d304172009-03-31 15:19:22 -07001239 seq_printf(m, "State: %s\n", ircomm_tty_state[self->state]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240
Alexey Dobriyan3d304172009-03-31 15:19:22 -07001241 seq_puts(m, "Service type: ");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001242 if (self->service_type & IRCOMM_9_WIRE)
Alexey Dobriyan3d304172009-03-31 15:19:22 -07001243 seq_puts(m, "9_WIRE");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244 else if (self->service_type & IRCOMM_3_WIRE)
Alexey Dobriyan3d304172009-03-31 15:19:22 -07001245 seq_puts(m, "3_WIRE");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001246 else if (self->service_type & IRCOMM_3_WIRE_RAW)
Alexey Dobriyan3d304172009-03-31 15:19:22 -07001247 seq_puts(m, "3_WIRE_RAW");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248 else
Alexey Dobriyan3d304172009-03-31 15:19:22 -07001249 seq_puts(m, "No common service type!\n");
1250 seq_putc(m, '\n');
Linus Torvalds1da177e2005-04-16 15:20:36 -07001251
Alexey Dobriyan3d304172009-03-31 15:19:22 -07001252 seq_printf(m, "Port name: %s\n", self->settings.port_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253
Alexey Dobriyan3d304172009-03-31 15:19:22 -07001254 seq_printf(m, "DTE status:");
1255 sep = ' ';
1256 if (self->settings.dte & IRCOMM_RTS) {
1257 seq_printf(m, "%cRTS", sep);
1258 sep = '|';
1259 }
1260 if (self->settings.dte & IRCOMM_DTR) {
1261 seq_printf(m, "%cDTR", sep);
1262 sep = '|';
1263 }
1264 seq_putc(m, '\n');
Linus Torvalds1da177e2005-04-16 15:20:36 -07001265
Alexey Dobriyan3d304172009-03-31 15:19:22 -07001266 seq_puts(m, "DCE status:");
1267 sep = ' ';
1268 if (self->settings.dce & IRCOMM_CTS) {
1269 seq_printf(m, "%cCTS", sep);
1270 sep = '|';
1271 }
1272 if (self->settings.dce & IRCOMM_DSR) {
1273 seq_printf(m, "%cDSR", sep);
1274 sep = '|';
1275 }
1276 if (self->settings.dce & IRCOMM_CD) {
1277 seq_printf(m, "%cCD", sep);
1278 sep = '|';
1279 }
1280 if (self->settings.dce & IRCOMM_RI) {
1281 seq_printf(m, "%cRI", sep);
1282 sep = '|';
1283 }
1284 seq_putc(m, '\n');
Linus Torvalds1da177e2005-04-16 15:20:36 -07001285
Alexey Dobriyan3d304172009-03-31 15:19:22 -07001286 seq_puts(m, "Configuration: ");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001287 if (!self->settings.null_modem)
Alexey Dobriyan3d304172009-03-31 15:19:22 -07001288 seq_puts(m, "DTE <-> DCE\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001289 else
Alexey Dobriyan3d304172009-03-31 15:19:22 -07001290 seq_puts(m, "DTE <-> DTE (null modem emulation)\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291
Alexey Dobriyan3d304172009-03-31 15:19:22 -07001292 seq_printf(m, "Data rate: %d\n", self->settings.data_rate);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001293
Alexey Dobriyan3d304172009-03-31 15:19:22 -07001294 seq_puts(m, "Flow control:");
1295 sep = ' ';
1296 if (self->settings.flow_control & IRCOMM_XON_XOFF_IN) {
1297 seq_printf(m, "%cXON_XOFF_IN", sep);
1298 sep = '|';
1299 }
1300 if (self->settings.flow_control & IRCOMM_XON_XOFF_OUT) {
1301 seq_printf(m, "%cXON_XOFF_OUT", sep);
1302 sep = '|';
1303 }
1304 if (self->settings.flow_control & IRCOMM_RTS_CTS_IN) {
1305 seq_printf(m, "%cRTS_CTS_IN", sep);
1306 sep = '|';
1307 }
1308 if (self->settings.flow_control & IRCOMM_RTS_CTS_OUT) {
1309 seq_printf(m, "%cRTS_CTS_OUT", sep);
1310 sep = '|';
1311 }
1312 if (self->settings.flow_control & IRCOMM_DSR_DTR_IN) {
1313 seq_printf(m, "%cDSR_DTR_IN", sep);
1314 sep = '|';
1315 }
1316 if (self->settings.flow_control & IRCOMM_DSR_DTR_OUT) {
1317 seq_printf(m, "%cDSR_DTR_OUT", sep);
1318 sep = '|';
1319 }
1320 if (self->settings.flow_control & IRCOMM_ENQ_ACK_IN) {
1321 seq_printf(m, "%cENQ_ACK_IN", sep);
1322 sep = '|';
1323 }
1324 if (self->settings.flow_control & IRCOMM_ENQ_ACK_OUT) {
1325 seq_printf(m, "%cENQ_ACK_OUT", sep);
1326 sep = '|';
1327 }
1328 seq_putc(m, '\n');
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329
Alexey Dobriyan3d304172009-03-31 15:19:22 -07001330 seq_puts(m, "Flags:");
1331 sep = ' ';
1332 if (self->flags & ASYNC_CTS_FLOW) {
1333 seq_printf(m, "%cASYNC_CTS_FLOW", sep);
1334 sep = '|';
1335 }
1336 if (self->flags & ASYNC_CHECK_CD) {
1337 seq_printf(m, "%cASYNC_CHECK_CD", sep);
1338 sep = '|';
1339 }
1340 if (self->flags & ASYNC_INITIALIZED) {
1341 seq_printf(m, "%cASYNC_INITIALIZED", sep);
1342 sep = '|';
1343 }
1344 if (self->flags & ASYNC_LOW_LATENCY) {
1345 seq_printf(m, "%cASYNC_LOW_LATENCY", sep);
1346 sep = '|';
1347 }
1348 if (self->flags & ASYNC_CLOSING) {
1349 seq_printf(m, "%cASYNC_CLOSING", sep);
1350 sep = '|';
1351 }
1352 if (self->flags & ASYNC_NORMAL_ACTIVE) {
1353 seq_printf(m, "%cASYNC_NORMAL_ACTIVE", sep);
1354 sep = '|';
1355 }
1356 seq_putc(m, '\n');
Linus Torvalds1da177e2005-04-16 15:20:36 -07001357
Alexey Dobriyan3d304172009-03-31 15:19:22 -07001358 seq_printf(m, "Role: %s\n", self->client ? "client" : "server");
1359 seq_printf(m, "Open count: %d\n", self->open_count);
1360 seq_printf(m, "Max data size: %d\n", self->max_data_size);
1361 seq_printf(m, "Max header size: %d\n", self->max_header_size);
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +09001362
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363 if (self->tty)
Alexey Dobriyan3d304172009-03-31 15:19:22 -07001364 seq_printf(m, "Hardware: %s\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001365 self->tty->hw_stopped ? "Stopped" : "Running");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001366}
1367
Alexey Dobriyan3d304172009-03-31 15:19:22 -07001368static int ircomm_tty_proc_show(struct seq_file *m, void *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369{
1370 struct ircomm_tty_cb *self;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371 unsigned long flags;
1372
1373 spin_lock_irqsave(&ircomm_tty->hb_spinlock, flags);
1374
1375 self = (struct ircomm_tty_cb *) hashbin_get_first(ircomm_tty);
Alexey Dobriyan3d304172009-03-31 15:19:22 -07001376 while (self != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001377 if (self->magic != IRCOMM_TTY_MAGIC)
1378 break;
1379
Alexey Dobriyan3d304172009-03-31 15:19:22 -07001380 ircomm_tty_line_info(self, m);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001381 self = (struct ircomm_tty_cb *) hashbin_get_next(ircomm_tty);
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +09001382 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001383 spin_unlock_irqrestore(&ircomm_tty->hb_spinlock, flags);
Alexey Dobriyan3d304172009-03-31 15:19:22 -07001384 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385}
Alexey Dobriyan3d304172009-03-31 15:19:22 -07001386
1387static int ircomm_tty_proc_open(struct inode *inode, struct file *file)
1388{
1389 return single_open(file, ircomm_tty_proc_show, NULL);
1390}
1391
1392static const struct file_operations ircomm_tty_proc_fops = {
1393 .owner = THIS_MODULE,
1394 .open = ircomm_tty_proc_open,
1395 .read = seq_read,
1396 .llseek = seq_lseek,
1397 .release = single_release,
1398};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399#endif /* CONFIG_PROC_FS */
1400
1401MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
1402MODULE_DESCRIPTION("IrCOMM serial TTY driver");
1403MODULE_LICENSE("GPL");
1404MODULE_ALIAS_CHARDEV_MAJOR(IRCOMM_TTY_MAJOR);
1405
1406module_init(ircomm_tty_init);
1407module_exit(ircomm_tty_cleanup);