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1da177e4 LT |
1 | /********************************************************************* |
2 | * | |
3 | * Filename: ircomm_tty.c | |
4 | * Version: 1.0 | |
5 | * Description: IrCOMM serial TTY driver | |
6 | * Status: Experimental. | |
7 | * Author: Dag Brattli <dagb@cs.uit.no> | |
8 | * Created at: Sun Jun 6 21:00:56 1999 | |
9 | * Modified at: Wed Feb 23 00:09:02 2000 | |
10 | * Modified by: Dag Brattli <dagb@cs.uit.no> | |
11 | * Sources: serial.c and previous IrCOMM work by Takahide Higuchi | |
12 | * | |
13 | * Copyright (c) 1999-2000 Dag Brattli, All Rights Reserved. | |
14 | * Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com> | |
15 | * | |
16 | * This program is free software; you can redistribute it and/or | |
17 | * modify it under the terms of the GNU General Public License as | |
18 | * published by the Free Software Foundation; either version 2 of | |
19 | * the License, or (at your option) any later version. | |
20 | * | |
21 | * This program is distributed in the hope that it will be useful, | |
22 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
23 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
24 | * GNU General Public License for more details. | |
25 | * | |
26 | * You should have received a copy of the GNU General Public License | |
27 | * along with this program; if not, write to the Free Software | |
28 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
29 | * MA 02111-1307 USA | |
30 | * | |
31 | ********************************************************************/ | |
32 | ||
1da177e4 LT |
33 | #include <linux/init.h> |
34 | #include <linux/module.h> | |
35 | #include <linux/fs.h> | |
36 | #include <linux/sched.h> | |
37 | #include <linux/termios.h> | |
38 | #include <linux/tty.h> | |
39 | #include <linux/interrupt.h> | |
40 | #include <linux/device.h> /* for MODULE_ALIAS_CHARDEV_MAJOR */ | |
41 | ||
42 | #include <asm/uaccess.h> | |
43 | ||
44 | #include <net/irda/irda.h> | |
45 | #include <net/irda/irmod.h> | |
46 | ||
47 | #include <net/irda/ircomm_core.h> | |
48 | #include <net/irda/ircomm_param.h> | |
49 | #include <net/irda/ircomm_tty_attach.h> | |
50 | #include <net/irda/ircomm_tty.h> | |
51 | ||
52 | static int ircomm_tty_open(struct tty_struct *tty, struct file *filp); | |
53 | static void ircomm_tty_close(struct tty_struct * tty, struct file *filp); | |
54 | static int ircomm_tty_write(struct tty_struct * tty, | |
55 | const unsigned char *buf, int count); | |
56 | static int ircomm_tty_write_room(struct tty_struct *tty); | |
57 | static void ircomm_tty_throttle(struct tty_struct *tty); | |
58 | static void ircomm_tty_unthrottle(struct tty_struct *tty); | |
59 | static int ircomm_tty_chars_in_buffer(struct tty_struct *tty); | |
60 | static void ircomm_tty_flush_buffer(struct tty_struct *tty); | |
61 | static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch); | |
62 | static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout); | |
63 | static void ircomm_tty_hangup(struct tty_struct *tty); | |
c4028958 | 64 | static void ircomm_tty_do_softint(struct work_struct *work); |
1da177e4 LT |
65 | static void ircomm_tty_shutdown(struct ircomm_tty_cb *self); |
66 | static void ircomm_tty_stop(struct tty_struct *tty); | |
67 | ||
68 | static int ircomm_tty_data_indication(void *instance, void *sap, | |
69 | struct sk_buff *skb); | |
70 | static int ircomm_tty_control_indication(void *instance, void *sap, | |
71 | struct sk_buff *skb); | |
72 | static void ircomm_tty_flow_indication(void *instance, void *sap, | |
73 | LOCAL_FLOW cmd); | |
74 | #ifdef CONFIG_PROC_FS | |
75 | static int ircomm_tty_read_proc(char *buf, char **start, off_t offset, int len, | |
76 | int *eof, void *unused); | |
77 | #endif /* CONFIG_PROC_FS */ | |
78 | static struct tty_driver *driver; | |
79 | ||
80 | hashbin_t *ircomm_tty = NULL; | |
81 | ||
b68e31d0 | 82 | static const struct tty_operations ops = { |
1da177e4 LT |
83 | .open = ircomm_tty_open, |
84 | .close = ircomm_tty_close, | |
85 | .write = ircomm_tty_write, | |
86 | .write_room = ircomm_tty_write_room, | |
87 | .chars_in_buffer = ircomm_tty_chars_in_buffer, | |
88 | .flush_buffer = ircomm_tty_flush_buffer, | |
89 | .ioctl = ircomm_tty_ioctl, /* ircomm_tty_ioctl.c */ | |
90 | .tiocmget = ircomm_tty_tiocmget, /* ircomm_tty_ioctl.c */ | |
91 | .tiocmset = ircomm_tty_tiocmset, /* ircomm_tty_ioctl.c */ | |
92 | .throttle = ircomm_tty_throttle, | |
93 | .unthrottle = ircomm_tty_unthrottle, | |
94 | .send_xchar = ircomm_tty_send_xchar, | |
95 | .set_termios = ircomm_tty_set_termios, | |
96 | .stop = ircomm_tty_stop, | |
97 | .start = ircomm_tty_start, | |
98 | .hangup = ircomm_tty_hangup, | |
99 | .wait_until_sent = ircomm_tty_wait_until_sent, | |
100 | #ifdef CONFIG_PROC_FS | |
101 | .read_proc = ircomm_tty_read_proc, | |
102 | #endif /* CONFIG_PROC_FS */ | |
103 | }; | |
104 | ||
105 | /* | |
106 | * Function ircomm_tty_init() | |
107 | * | |
108 | * Init IrCOMM TTY layer/driver | |
109 | * | |
110 | */ | |
111 | static int __init ircomm_tty_init(void) | |
112 | { | |
113 | driver = alloc_tty_driver(IRCOMM_TTY_PORTS); | |
114 | if (!driver) | |
115 | return -ENOMEM; | |
116 | ircomm_tty = hashbin_new(HB_LOCK); | |
117 | if (ircomm_tty == NULL) { | |
118 | IRDA_ERROR("%s(), can't allocate hashbin!\n", __FUNCTION__); | |
119 | put_tty_driver(driver); | |
120 | return -ENOMEM; | |
121 | } | |
122 | ||
123 | driver->owner = THIS_MODULE; | |
124 | driver->driver_name = "ircomm"; | |
125 | driver->name = "ircomm"; | |
1da177e4 LT |
126 | driver->major = IRCOMM_TTY_MAJOR; |
127 | driver->minor_start = IRCOMM_TTY_MINOR; | |
128 | driver->type = TTY_DRIVER_TYPE_SERIAL; | |
129 | driver->subtype = SERIAL_TYPE_NORMAL; | |
130 | driver->init_termios = tty_std_termios; | |
131 | driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; | |
132 | driver->flags = TTY_DRIVER_REAL_RAW; | |
133 | tty_set_operations(driver, &ops); | |
134 | if (tty_register_driver(driver)) { | |
135 | IRDA_ERROR("%s(): Couldn't register serial driver\n", | |
136 | __FUNCTION__); | |
137 | put_tty_driver(driver); | |
138 | return -1; | |
139 | } | |
140 | return 0; | |
141 | } | |
142 | ||
143 | static void __exit __ircomm_tty_cleanup(struct ircomm_tty_cb *self) | |
144 | { | |
145 | IRDA_DEBUG(0, "%s()\n", __FUNCTION__ ); | |
146 | ||
147 | IRDA_ASSERT(self != NULL, return;); | |
148 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
149 | ||
150 | ircomm_tty_shutdown(self); | |
151 | ||
152 | self->magic = 0; | |
153 | kfree(self); | |
154 | } | |
155 | ||
156 | /* | |
157 | * Function ircomm_tty_cleanup () | |
158 | * | |
159 | * Remove IrCOMM TTY layer/driver | |
160 | * | |
161 | */ | |
162 | static void __exit ircomm_tty_cleanup(void) | |
163 | { | |
164 | int ret; | |
165 | ||
166 | IRDA_DEBUG(4, "%s()\n", __FUNCTION__ ); | |
167 | ||
168 | ret = tty_unregister_driver(driver); | |
169 | if (ret) { | |
170 | IRDA_ERROR("%s(), failed to unregister driver\n", | |
171 | __FUNCTION__); | |
172 | return; | |
173 | } | |
174 | ||
175 | hashbin_delete(ircomm_tty, (FREE_FUNC) __ircomm_tty_cleanup); | |
176 | put_tty_driver(driver); | |
177 | } | |
178 | ||
179 | /* | |
180 | * Function ircomm_startup (self) | |
181 | * | |
182 | * | |
183 | * | |
184 | */ | |
185 | static int ircomm_tty_startup(struct ircomm_tty_cb *self) | |
186 | { | |
187 | notify_t notify; | |
188 | int ret = -ENODEV; | |
189 | ||
190 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); | |
191 | ||
192 | IRDA_ASSERT(self != NULL, return -1;); | |
193 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
194 | ||
195 | /* Check if already open */ | |
196 | if (test_and_set_bit(ASYNC_B_INITIALIZED, &self->flags)) { | |
197 | IRDA_DEBUG(2, "%s(), already open so break out!\n", __FUNCTION__ ); | |
198 | return 0; | |
199 | } | |
200 | ||
201 | /* Register with IrCOMM */ | |
202 | irda_notify_init(¬ify); | |
203 | /* These callbacks we must handle ourselves */ | |
204 | notify.data_indication = ircomm_tty_data_indication; | |
205 | notify.udata_indication = ircomm_tty_control_indication; | |
206 | notify.flow_indication = ircomm_tty_flow_indication; | |
207 | ||
208 | /* Use the ircomm_tty interface for these ones */ | |
209 | notify.disconnect_indication = ircomm_tty_disconnect_indication; | |
210 | notify.connect_confirm = ircomm_tty_connect_confirm; | |
211 | notify.connect_indication = ircomm_tty_connect_indication; | |
212 | strlcpy(notify.name, "ircomm_tty", sizeof(notify.name)); | |
213 | notify.instance = self; | |
214 | ||
215 | if (!self->ircomm) { | |
216 | self->ircomm = ircomm_open(¬ify, self->service_type, | |
217 | self->line); | |
218 | } | |
219 | if (!self->ircomm) | |
220 | goto err; | |
221 | ||
222 | self->slsap_sel = self->ircomm->slsap_sel; | |
223 | ||
224 | /* Connect IrCOMM link with remote device */ | |
225 | ret = ircomm_tty_attach_cable(self); | |
226 | if (ret < 0) { | |
227 | IRDA_ERROR("%s(), error attaching cable!\n", __FUNCTION__); | |
228 | goto err; | |
229 | } | |
230 | ||
231 | return 0; | |
232 | err: | |
233 | clear_bit(ASYNC_B_INITIALIZED, &self->flags); | |
234 | return ret; | |
235 | } | |
236 | ||
237 | /* | |
238 | * Function ircomm_block_til_ready (self, filp) | |
239 | * | |
240 | * | |
241 | * | |
242 | */ | |
243 | static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self, | |
244 | struct file *filp) | |
245 | { | |
246 | DECLARE_WAITQUEUE(wait, current); | |
247 | int retval; | |
248 | int do_clocal = 0, extra_count = 0; | |
249 | unsigned long flags; | |
250 | struct tty_struct *tty; | |
251 | ||
252 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); | |
253 | ||
254 | tty = self->tty; | |
255 | ||
256 | /* | |
257 | * If non-blocking mode is set, or the port is not enabled, | |
258 | * then make the check up front and then exit. | |
259 | */ | |
260 | if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){ | |
261 | /* nonblock mode is set or port is not enabled */ | |
262 | self->flags |= ASYNC_NORMAL_ACTIVE; | |
263 | IRDA_DEBUG(1, "%s(), O_NONBLOCK requested!\n", __FUNCTION__ ); | |
264 | return 0; | |
265 | } | |
266 | ||
267 | if (tty->termios->c_cflag & CLOCAL) { | |
268 | IRDA_DEBUG(1, "%s(), doing CLOCAL!\n", __FUNCTION__ ); | |
269 | do_clocal = 1; | |
270 | } | |
271 | ||
272 | /* Wait for carrier detect and the line to become | |
273 | * free (i.e., not in use by the callout). While we are in | |
274 | * this loop, self->open_count is dropped by one, so that | |
275 | * mgsl_close() knows when to free things. We restore it upon | |
276 | * exit, either normal or abnormal. | |
277 | */ | |
278 | ||
279 | retval = 0; | |
280 | add_wait_queue(&self->open_wait, &wait); | |
281 | ||
282 | IRDA_DEBUG(2, "%s(%d):block_til_ready before block on %s open_count=%d\n", | |
283 | __FILE__,__LINE__, tty->driver->name, self->open_count ); | |
284 | ||
285 | /* As far as I can see, we protect open_count - Jean II */ | |
286 | spin_lock_irqsave(&self->spinlock, flags); | |
287 | if (!tty_hung_up_p(filp)) { | |
288 | extra_count = 1; | |
289 | self->open_count--; | |
290 | } | |
291 | spin_unlock_irqrestore(&self->spinlock, flags); | |
292 | self->blocked_open++; | |
293 | ||
294 | while (1) { | |
295 | if (tty->termios->c_cflag & CBAUD) { | |
296 | /* Here, we use to lock those two guys, but | |
297 | * as ircomm_param_request() does it itself, | |
298 | * I don't see the point (and I see the deadlock). | |
299 | * Jean II */ | |
300 | self->settings.dte |= IRCOMM_RTS + IRCOMM_DTR; | |
301 | ||
302 | ircomm_param_request(self, IRCOMM_DTE, TRUE); | |
303 | } | |
304 | ||
305 | current->state = TASK_INTERRUPTIBLE; | |
306 | ||
307 | if (tty_hung_up_p(filp) || | |
308 | !test_bit(ASYNC_B_INITIALIZED, &self->flags)) { | |
309 | retval = (self->flags & ASYNC_HUP_NOTIFY) ? | |
310 | -EAGAIN : -ERESTARTSYS; | |
311 | break; | |
312 | } | |
313 | ||
314 | /* | |
315 | * Check if link is ready now. Even if CLOCAL is | |
316 | * specified, we cannot return before the IrCOMM link is | |
317 | * ready | |
318 | */ | |
319 | if (!test_bit(ASYNC_B_CLOSING, &self->flags) && | |
320 | (do_clocal || (self->settings.dce & IRCOMM_CD)) && | |
321 | self->state == IRCOMM_TTY_READY) | |
322 | { | |
323 | break; | |
324 | } | |
325 | ||
326 | if (signal_pending(current)) { | |
327 | retval = -ERESTARTSYS; | |
328 | break; | |
329 | } | |
330 | ||
331 | IRDA_DEBUG(1, "%s(%d):block_til_ready blocking on %s open_count=%d\n", | |
332 | __FILE__,__LINE__, tty->driver->name, self->open_count ); | |
333 | ||
334 | schedule(); | |
335 | } | |
336 | ||
337 | __set_current_state(TASK_RUNNING); | |
338 | remove_wait_queue(&self->open_wait, &wait); | |
339 | ||
340 | if (extra_count) { | |
341 | /* ++ is not atomic, so this should be protected - Jean II */ | |
342 | spin_lock_irqsave(&self->spinlock, flags); | |
343 | self->open_count++; | |
344 | spin_unlock_irqrestore(&self->spinlock, flags); | |
345 | } | |
346 | self->blocked_open--; | |
347 | ||
348 | IRDA_DEBUG(1, "%s(%d):block_til_ready after blocking on %s open_count=%d\n", | |
349 | __FILE__,__LINE__, tty->driver->name, self->open_count); | |
350 | ||
351 | if (!retval) | |
352 | self->flags |= ASYNC_NORMAL_ACTIVE; | |
353 | ||
354 | return retval; | |
355 | } | |
356 | ||
357 | /* | |
358 | * Function ircomm_tty_open (tty, filp) | |
359 | * | |
360 | * This routine is called when a particular tty device is opened. This | |
361 | * routine is mandatory; if this routine is not filled in, the attempted | |
362 | * open will fail with ENODEV. | |
363 | */ | |
364 | static int ircomm_tty_open(struct tty_struct *tty, struct file *filp) | |
365 | { | |
366 | struct ircomm_tty_cb *self; | |
367 | unsigned int line; | |
368 | unsigned long flags; | |
369 | int ret; | |
370 | ||
371 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); | |
372 | ||
373 | line = tty->index; | |
374 | if ((line < 0) || (line >= IRCOMM_TTY_PORTS)) { | |
375 | return -ENODEV; | |
376 | } | |
377 | ||
378 | /* Check if instance already exists */ | |
379 | self = hashbin_lock_find(ircomm_tty, line, NULL); | |
380 | if (!self) { | |
381 | /* No, so make new instance */ | |
0da974f4 | 382 | self = kzalloc(sizeof(struct ircomm_tty_cb), GFP_KERNEL); |
1da177e4 LT |
383 | if (self == NULL) { |
384 | IRDA_ERROR("%s(), kmalloc failed!\n", __FUNCTION__); | |
385 | return -ENOMEM; | |
386 | } | |
1da177e4 LT |
387 | |
388 | self->magic = IRCOMM_TTY_MAGIC; | |
389 | self->flow = FLOW_STOP; | |
390 | ||
391 | self->line = line; | |
c4028958 | 392 | INIT_WORK(&self->tqueue, ircomm_tty_do_softint); |
1da177e4 LT |
393 | self->max_header_size = IRCOMM_TTY_HDR_UNINITIALISED; |
394 | self->max_data_size = IRCOMM_TTY_DATA_UNINITIALISED; | |
395 | self->close_delay = 5*HZ/10; | |
396 | self->closing_wait = 30*HZ; | |
397 | ||
398 | /* Init some important stuff */ | |
399 | init_timer(&self->watchdog_timer); | |
400 | init_waitqueue_head(&self->open_wait); | |
401 | init_waitqueue_head(&self->close_wait); | |
402 | spin_lock_init(&self->spinlock); | |
403 | ||
404 | /* | |
405 | * Force TTY into raw mode by default which is usually what | |
406 | * we want for IrCOMM and IrLPT. This way applications will | |
407 | * not have to twiddle with printcap etc. | |
408 | */ | |
409 | tty->termios->c_iflag = 0; | |
410 | tty->termios->c_oflag = 0; | |
411 | ||
412 | /* Insert into hash */ | |
413 | hashbin_insert(ircomm_tty, (irda_queue_t *) self, line, NULL); | |
414 | } | |
415 | /* ++ is not atomic, so this should be protected - Jean II */ | |
416 | spin_lock_irqsave(&self->spinlock, flags); | |
417 | self->open_count++; | |
418 | ||
419 | tty->driver_data = self; | |
420 | self->tty = tty; | |
421 | spin_unlock_irqrestore(&self->spinlock, flags); | |
422 | ||
423 | IRDA_DEBUG(1, "%s(), %s%d, count = %d\n", __FUNCTION__ , tty->driver->name, | |
424 | self->line, self->open_count); | |
425 | ||
426 | /* Not really used by us, but lets do it anyway */ | |
427 | self->tty->low_latency = (self->flags & ASYNC_LOW_LATENCY) ? 1 : 0; | |
428 | ||
429 | /* | |
430 | * If the port is the middle of closing, bail out now | |
431 | */ | |
432 | if (tty_hung_up_p(filp) || | |
433 | test_bit(ASYNC_B_CLOSING, &self->flags)) { | |
434 | ||
435 | /* Hm, why are we blocking on ASYNC_CLOSING if we | |
436 | * do return -EAGAIN/-ERESTARTSYS below anyway? | |
437 | * IMHO it's either not needed in the first place | |
438 | * or for some reason we need to make sure the async | |
439 | * closing has been finished - if so, wouldn't we | |
440 | * probably better sleep uninterruptible? | |
441 | */ | |
442 | ||
443 | if (wait_event_interruptible(self->close_wait, !test_bit(ASYNC_B_CLOSING, &self->flags))) { | |
444 | IRDA_WARNING("%s - got signal while blocking on ASYNC_CLOSING!\n", | |
445 | __FUNCTION__); | |
446 | return -ERESTARTSYS; | |
447 | } | |
448 | ||
449 | #ifdef SERIAL_DO_RESTART | |
450 | return ((self->flags & ASYNC_HUP_NOTIFY) ? | |
451 | -EAGAIN : -ERESTARTSYS); | |
452 | #else | |
453 | return -EAGAIN; | |
454 | #endif | |
455 | } | |
456 | ||
457 | /* Check if this is a "normal" ircomm device, or an irlpt device */ | |
458 | if (line < 0x10) { | |
459 | self->service_type = IRCOMM_3_WIRE | IRCOMM_9_WIRE; | |
460 | self->settings.service_type = IRCOMM_9_WIRE; /* 9 wire as default */ | |
461 | /* Jan Kiszka -> add DSR/RI -> Conform to IrCOMM spec */ | |
462 | self->settings.dce = IRCOMM_CTS | IRCOMM_CD | IRCOMM_DSR | IRCOMM_RI; /* Default line settings */ | |
463 | IRDA_DEBUG(2, "%s(), IrCOMM device\n", __FUNCTION__ ); | |
464 | } else { | |
465 | IRDA_DEBUG(2, "%s(), IrLPT device\n", __FUNCTION__ ); | |
466 | self->service_type = IRCOMM_3_WIRE_RAW; | |
467 | self->settings.service_type = IRCOMM_3_WIRE_RAW; /* Default */ | |
468 | } | |
469 | ||
470 | ret = ircomm_tty_startup(self); | |
471 | if (ret) | |
472 | return ret; | |
473 | ||
474 | ret = ircomm_tty_block_til_ready(self, filp); | |
475 | if (ret) { | |
476 | IRDA_DEBUG(2, | |
477 | "%s(), returning after block_til_ready with %d\n", __FUNCTION__ , | |
478 | ret); | |
479 | ||
480 | return ret; | |
481 | } | |
482 | return 0; | |
483 | } | |
484 | ||
485 | /* | |
486 | * Function ircomm_tty_close (tty, filp) | |
487 | * | |
488 | * This routine is called when a particular tty device is closed. | |
489 | * | |
490 | */ | |
491 | static void ircomm_tty_close(struct tty_struct *tty, struct file *filp) | |
492 | { | |
493 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
494 | unsigned long flags; | |
495 | ||
496 | IRDA_DEBUG(0, "%s()\n", __FUNCTION__ ); | |
497 | ||
498 | if (!tty) | |
499 | return; | |
500 | ||
501 | IRDA_ASSERT(self != NULL, return;); | |
502 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
503 | ||
504 | spin_lock_irqsave(&self->spinlock, flags); | |
505 | ||
506 | if (tty_hung_up_p(filp)) { | |
507 | spin_unlock_irqrestore(&self->spinlock, flags); | |
508 | ||
509 | IRDA_DEBUG(0, "%s(), returning 1\n", __FUNCTION__ ); | |
510 | return; | |
511 | } | |
512 | ||
513 | if ((tty->count == 1) && (self->open_count != 1)) { | |
514 | /* | |
515 | * Uh, oh. tty->count is 1, which means that the tty | |
516 | * structure will be freed. state->count should always | |
517 | * be one in these conditions. If it's greater than | |
518 | * one, we've got real problems, since it means the | |
519 | * serial port won't be shutdown. | |
520 | */ | |
521 | IRDA_DEBUG(0, "%s(), bad serial port count; " | |
522 | "tty->count is 1, state->count is %d\n", __FUNCTION__ , | |
523 | self->open_count); | |
524 | self->open_count = 1; | |
525 | } | |
526 | ||
527 | if (--self->open_count < 0) { | |
528 | IRDA_ERROR("%s(), bad serial port count for ttys%d: %d\n", | |
529 | __FUNCTION__, self->line, self->open_count); | |
530 | self->open_count = 0; | |
531 | } | |
532 | if (self->open_count) { | |
533 | spin_unlock_irqrestore(&self->spinlock, flags); | |
534 | ||
535 | IRDA_DEBUG(0, "%s(), open count > 0\n", __FUNCTION__ ); | |
536 | return; | |
537 | } | |
538 | ||
539 | /* Hum... Should be test_and_set_bit ??? - Jean II */ | |
540 | set_bit(ASYNC_B_CLOSING, &self->flags); | |
541 | ||
542 | /* We need to unlock here (we were unlocking at the end of this | |
543 | * function), because tty_wait_until_sent() may schedule. | |
544 | * I don't know if the rest should be protected somehow, | |
545 | * so someone should check. - Jean II */ | |
546 | spin_unlock_irqrestore(&self->spinlock, flags); | |
547 | ||
548 | /* | |
549 | * Now we wait for the transmit buffer to clear; and we notify | |
550 | * the line discipline to only process XON/XOFF characters. | |
551 | */ | |
552 | tty->closing = 1; | |
553 | if (self->closing_wait != ASYNC_CLOSING_WAIT_NONE) | |
554 | tty_wait_until_sent(tty, self->closing_wait); | |
555 | ||
556 | ircomm_tty_shutdown(self); | |
557 | ||
558 | if (tty->driver->flush_buffer) | |
559 | tty->driver->flush_buffer(tty); | |
560 | if (tty->ldisc.flush_buffer) | |
561 | tty->ldisc.flush_buffer(tty); | |
562 | ||
563 | tty->closing = 0; | |
564 | self->tty = NULL; | |
565 | ||
566 | if (self->blocked_open) { | |
121caf57 NA |
567 | if (self->close_delay) |
568 | schedule_timeout_interruptible(self->close_delay); | |
1da177e4 LT |
569 | wake_up_interruptible(&self->open_wait); |
570 | } | |
571 | ||
572 | self->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING); | |
573 | wake_up_interruptible(&self->close_wait); | |
574 | } | |
575 | ||
576 | /* | |
577 | * Function ircomm_tty_flush_buffer (tty) | |
578 | * | |
579 | * | |
580 | * | |
581 | */ | |
582 | static void ircomm_tty_flush_buffer(struct tty_struct *tty) | |
583 | { | |
584 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
585 | ||
586 | IRDA_ASSERT(self != NULL, return;); | |
587 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
588 | ||
589 | /* | |
590 | * Let do_softint() do this to avoid race condition with | |
591 | * do_softint() ;-) | |
592 | */ | |
593 | schedule_work(&self->tqueue); | |
594 | } | |
595 | ||
596 | /* | |
c4028958 | 597 | * Function ircomm_tty_do_softint (work) |
1da177e4 LT |
598 | * |
599 | * We use this routine to give the write wakeup to the user at at a | |
600 | * safe time (as fast as possible after write have completed). This | |
601 | * can be compared to the Tx interrupt. | |
602 | */ | |
c4028958 | 603 | static void ircomm_tty_do_softint(struct work_struct *work) |
1da177e4 | 604 | { |
c4028958 DH |
605 | struct ircomm_tty_cb *self = |
606 | container_of(work, struct ircomm_tty_cb, tqueue); | |
1da177e4 LT |
607 | struct tty_struct *tty; |
608 | unsigned long flags; | |
609 | struct sk_buff *skb, *ctrl_skb; | |
610 | ||
611 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); | |
612 | ||
613 | if (!self || self->magic != IRCOMM_TTY_MAGIC) | |
614 | return; | |
615 | ||
616 | tty = self->tty; | |
617 | if (!tty) | |
618 | return; | |
619 | ||
620 | /* Unlink control buffer */ | |
621 | spin_lock_irqsave(&self->spinlock, flags); | |
622 | ||
623 | ctrl_skb = self->ctrl_skb; | |
624 | self->ctrl_skb = NULL; | |
625 | ||
626 | spin_unlock_irqrestore(&self->spinlock, flags); | |
627 | ||
628 | /* Flush control buffer if any */ | |
629 | if(ctrl_skb) { | |
630 | if(self->flow == FLOW_START) | |
631 | ircomm_control_request(self->ircomm, ctrl_skb); | |
632 | /* Drop reference count - see ircomm_ttp_data_request(). */ | |
633 | dev_kfree_skb(ctrl_skb); | |
634 | } | |
635 | ||
636 | if (tty->hw_stopped) | |
637 | return; | |
638 | ||
639 | /* Unlink transmit buffer */ | |
640 | spin_lock_irqsave(&self->spinlock, flags); | |
641 | ||
642 | skb = self->tx_skb; | |
643 | self->tx_skb = NULL; | |
644 | ||
645 | spin_unlock_irqrestore(&self->spinlock, flags); | |
646 | ||
647 | /* Flush transmit buffer if any */ | |
648 | if (skb) { | |
649 | ircomm_tty_do_event(self, IRCOMM_TTY_DATA_REQUEST, skb, NULL); | |
650 | /* Drop reference count - see ircomm_ttp_data_request(). */ | |
651 | dev_kfree_skb(skb); | |
652 | } | |
653 | ||
654 | /* Check if user (still) wants to be waken up */ | |
655 | if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && | |
656 | tty->ldisc.write_wakeup) | |
657 | { | |
658 | (tty->ldisc.write_wakeup)(tty); | |
659 | } | |
660 | wake_up_interruptible(&tty->write_wait); | |
661 | } | |
662 | ||
663 | /* | |
664 | * Function ircomm_tty_write (tty, buf, count) | |
665 | * | |
666 | * This routine is called by the kernel to write a series of characters | |
667 | * to the tty device. The characters may come from user space or kernel | |
668 | * space. This routine will return the number of characters actually | |
669 | * accepted for writing. This routine is mandatory. | |
670 | */ | |
671 | static int ircomm_tty_write(struct tty_struct *tty, | |
672 | const unsigned char *buf, int count) | |
673 | { | |
674 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
675 | unsigned long flags; | |
676 | struct sk_buff *skb; | |
677 | int tailroom = 0; | |
678 | int len = 0; | |
679 | int size; | |
680 | ||
681 | IRDA_DEBUG(2, "%s(), count=%d, hw_stopped=%d\n", __FUNCTION__ , count, | |
682 | tty->hw_stopped); | |
683 | ||
684 | IRDA_ASSERT(self != NULL, return -1;); | |
685 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
686 | ||
687 | /* We may receive packets from the TTY even before we have finished | |
688 | * our setup. Not cool. | |
689 | * The problem is that we don't know the final header and data size | |
690 | * to create the proper skb, so any skb we would create would have | |
691 | * bogus header and data size, so need care. | |
692 | * We use a bogus header size to safely detect this condition. | |
693 | * Another problem is that hw_stopped was set to 0 way before it | |
694 | * should be, so we would drop this skb. It should now be fixed. | |
695 | * One option is to not accept data until we are properly setup. | |
696 | * But, I suspect that when it happens, the ppp line discipline | |
697 | * just "drops" the data, which might screw up connect scripts. | |
698 | * The second option is to create a "safe skb", with large header | |
699 | * and small size (see ircomm_tty_open() for values). | |
700 | * We just need to make sure that when the real values get filled, | |
701 | * we don't mess up the original "safe skb" (see tx_data_size). | |
702 | * Jean II */ | |
703 | if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) { | |
704 | IRDA_DEBUG(1, "%s() : not initialised\n", __FUNCTION__); | |
705 | #ifdef IRCOMM_NO_TX_BEFORE_INIT | |
706 | /* We didn't consume anything, TTY will retry */ | |
707 | return 0; | |
708 | #endif | |
709 | } | |
710 | ||
711 | if (count < 1) | |
712 | return 0; | |
713 | ||
714 | /* Protect our manipulation of self->tx_skb and related */ | |
715 | spin_lock_irqsave(&self->spinlock, flags); | |
716 | ||
717 | /* Fetch current transmit buffer */ | |
718 | skb = self->tx_skb; | |
719 | ||
720 | /* | |
721 | * Send out all the data we get, possibly as multiple fragmented | |
722 | * frames, but this will only happen if the data is larger than the | |
723 | * max data size. The normal case however is just the opposite, and | |
724 | * this function may be called multiple times, and will then actually | |
725 | * defragment the data and send it out as one packet as soon as | |
726 | * possible, but at a safer point in time | |
727 | */ | |
728 | while (count) { | |
729 | size = count; | |
730 | ||
731 | /* Adjust data size to the max data size */ | |
732 | if (size > self->max_data_size) | |
733 | size = self->max_data_size; | |
734 | ||
735 | /* | |
736 | * Do we already have a buffer ready for transmit, or do | |
737 | * we need to allocate a new frame | |
738 | */ | |
739 | if (skb) { | |
740 | /* | |
741 | * Any room for more data at the end of the current | |
742 | * transmit buffer? Cannot use skb_tailroom, since | |
743 | * dev_alloc_skb gives us a larger skb than we | |
744 | * requested | |
745 | * Note : use tx_data_size, because max_data_size | |
746 | * may have changed and we don't want to overwrite | |
747 | * the skb. - Jean II | |
748 | */ | |
749 | if ((tailroom = (self->tx_data_size - skb->len)) > 0) { | |
750 | /* Adjust data to tailroom */ | |
751 | if (size > tailroom) | |
752 | size = tailroom; | |
753 | } else { | |
754 | /* | |
755 | * Current transmit frame is full, so break | |
756 | * out, so we can send it as soon as possible | |
757 | */ | |
758 | break; | |
759 | } | |
760 | } else { | |
761 | /* Prepare a full sized frame */ | |
485fb2c9 SO |
762 | skb = alloc_skb(self->max_data_size+ |
763 | self->max_header_size, | |
764 | GFP_ATOMIC); | |
1da177e4 LT |
765 | if (!skb) { |
766 | spin_unlock_irqrestore(&self->spinlock, flags); | |
767 | return -ENOBUFS; | |
768 | } | |
769 | skb_reserve(skb, self->max_header_size); | |
770 | self->tx_skb = skb; | |
771 | /* Remember skb size because max_data_size may | |
772 | * change later on - Jean II */ | |
773 | self->tx_data_size = self->max_data_size; | |
774 | } | |
775 | ||
776 | /* Copy data */ | |
777 | memcpy(skb_put(skb,size), buf + len, size); | |
778 | ||
779 | count -= size; | |
780 | len += size; | |
781 | } | |
782 | ||
783 | spin_unlock_irqrestore(&self->spinlock, flags); | |
784 | ||
785 | /* | |
786 | * Schedule a new thread which will transmit the frame as soon | |
787 | * as possible, but at a safe point in time. We do this so the | |
788 | * "user" can give us data multiple times, as PPP does (because of | |
789 | * its 256 byte tx buffer). We will then defragment and send out | |
790 | * all this data as one single packet. | |
791 | */ | |
792 | schedule_work(&self->tqueue); | |
793 | ||
794 | return len; | |
795 | } | |
796 | ||
797 | /* | |
798 | * Function ircomm_tty_write_room (tty) | |
799 | * | |
800 | * This routine returns the numbers of characters the tty driver will | |
801 | * accept for queuing to be written. This number is subject to change as | |
802 | * output buffers get emptied, or if the output flow control is acted. | |
803 | */ | |
804 | static int ircomm_tty_write_room(struct tty_struct *tty) | |
805 | { | |
806 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
807 | unsigned long flags; | |
808 | int ret; | |
809 | ||
810 | IRDA_ASSERT(self != NULL, return -1;); | |
811 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
812 | ||
813 | #ifdef IRCOMM_NO_TX_BEFORE_INIT | |
814 | /* max_header_size tells us if the channel is initialised or not. */ | |
815 | if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) | |
816 | /* Don't bother us yet */ | |
817 | return 0; | |
818 | #endif | |
819 | ||
820 | /* Check if we are allowed to transmit any data. | |
821 | * hw_stopped is the regular flow control. | |
822 | * Jean II */ | |
823 | if (tty->hw_stopped) | |
824 | ret = 0; | |
825 | else { | |
826 | spin_lock_irqsave(&self->spinlock, flags); | |
827 | if (self->tx_skb) | |
828 | ret = self->tx_data_size - self->tx_skb->len; | |
829 | else | |
830 | ret = self->max_data_size; | |
831 | spin_unlock_irqrestore(&self->spinlock, flags); | |
832 | } | |
833 | IRDA_DEBUG(2, "%s(), ret=%d\n", __FUNCTION__ , ret); | |
834 | ||
835 | return ret; | |
836 | } | |
837 | ||
838 | /* | |
839 | * Function ircomm_tty_wait_until_sent (tty, timeout) | |
840 | * | |
841 | * This routine waits until the device has written out all of the | |
842 | * characters in its transmitter FIFO. | |
843 | */ | |
844 | static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout) | |
845 | { | |
846 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
847 | unsigned long orig_jiffies, poll_time; | |
848 | unsigned long flags; | |
849 | ||
850 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); | |
851 | ||
852 | IRDA_ASSERT(self != NULL, return;); | |
853 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
854 | ||
855 | orig_jiffies = jiffies; | |
856 | ||
857 | /* Set poll time to 200 ms */ | |
858 | poll_time = IRDA_MIN(timeout, msecs_to_jiffies(200)); | |
859 | ||
860 | spin_lock_irqsave(&self->spinlock, flags); | |
861 | while (self->tx_skb && self->tx_skb->len) { | |
862 | spin_unlock_irqrestore(&self->spinlock, flags); | |
121caf57 | 863 | schedule_timeout_interruptible(poll_time); |
1da177e4 LT |
864 | spin_lock_irqsave(&self->spinlock, flags); |
865 | if (signal_pending(current)) | |
866 | break; | |
867 | if (timeout && time_after(jiffies, orig_jiffies + timeout)) | |
868 | break; | |
869 | } | |
870 | spin_unlock_irqrestore(&self->spinlock, flags); | |
871 | current->state = TASK_RUNNING; | |
872 | } | |
873 | ||
874 | /* | |
875 | * Function ircomm_tty_throttle (tty) | |
876 | * | |
877 | * This routine notifies the tty driver that input buffers for the line | |
878 | * discipline are close to full, and it should somehow signal that no | |
879 | * more characters should be sent to the tty. | |
880 | */ | |
881 | static void ircomm_tty_throttle(struct tty_struct *tty) | |
882 | { | |
883 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
884 | ||
885 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); | |
886 | ||
887 | IRDA_ASSERT(self != NULL, return;); | |
888 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
889 | ||
890 | /* Software flow control? */ | |
891 | if (I_IXOFF(tty)) | |
892 | ircomm_tty_send_xchar(tty, STOP_CHAR(tty)); | |
893 | ||
894 | /* Hardware flow control? */ | |
895 | if (tty->termios->c_cflag & CRTSCTS) { | |
896 | self->settings.dte &= ~IRCOMM_RTS; | |
897 | self->settings.dte |= IRCOMM_DELTA_RTS; | |
898 | ||
899 | ircomm_param_request(self, IRCOMM_DTE, TRUE); | |
900 | } | |
901 | ||
902 | ircomm_flow_request(self->ircomm, FLOW_STOP); | |
903 | } | |
904 | ||
905 | /* | |
906 | * Function ircomm_tty_unthrottle (tty) | |
907 | * | |
908 | * This routine notifies the tty drivers that it should signals that | |
909 | * characters can now be sent to the tty without fear of overrunning the | |
910 | * input buffers of the line disciplines. | |
911 | */ | |
912 | static void ircomm_tty_unthrottle(struct tty_struct *tty) | |
913 | { | |
914 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
915 | ||
916 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); | |
917 | ||
918 | IRDA_ASSERT(self != NULL, return;); | |
919 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
920 | ||
921 | /* Using software flow control? */ | |
922 | if (I_IXOFF(tty)) { | |
923 | ircomm_tty_send_xchar(tty, START_CHAR(tty)); | |
924 | } | |
925 | ||
926 | /* Using hardware flow control? */ | |
927 | if (tty->termios->c_cflag & CRTSCTS) { | |
928 | self->settings.dte |= (IRCOMM_RTS|IRCOMM_DELTA_RTS); | |
929 | ||
930 | ircomm_param_request(self, IRCOMM_DTE, TRUE); | |
931 | IRDA_DEBUG(1, "%s(), FLOW_START\n", __FUNCTION__ ); | |
932 | } | |
933 | ircomm_flow_request(self->ircomm, FLOW_START); | |
934 | } | |
935 | ||
936 | /* | |
937 | * Function ircomm_tty_chars_in_buffer (tty) | |
938 | * | |
939 | * Indicates if there are any data in the buffer | |
940 | * | |
941 | */ | |
942 | static int ircomm_tty_chars_in_buffer(struct tty_struct *tty) | |
943 | { | |
944 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
945 | unsigned long flags; | |
946 | int len = 0; | |
947 | ||
948 | IRDA_ASSERT(self != NULL, return -1;); | |
949 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
950 | ||
951 | spin_lock_irqsave(&self->spinlock, flags); | |
952 | ||
953 | if (self->tx_skb) | |
954 | len = self->tx_skb->len; | |
955 | ||
956 | spin_unlock_irqrestore(&self->spinlock, flags); | |
957 | ||
958 | return len; | |
959 | } | |
960 | ||
961 | static void ircomm_tty_shutdown(struct ircomm_tty_cb *self) | |
962 | { | |
963 | unsigned long flags; | |
964 | ||
965 | IRDA_ASSERT(self != NULL, return;); | |
966 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
967 | ||
968 | IRDA_DEBUG(0, "%s()\n", __FUNCTION__ ); | |
969 | ||
970 | if (!test_and_clear_bit(ASYNC_B_INITIALIZED, &self->flags)) | |
971 | return; | |
972 | ||
973 | ircomm_tty_detach_cable(self); | |
974 | ||
975 | spin_lock_irqsave(&self->spinlock, flags); | |
976 | ||
977 | del_timer(&self->watchdog_timer); | |
978 | ||
979 | /* Free parameter buffer */ | |
980 | if (self->ctrl_skb) { | |
981 | dev_kfree_skb(self->ctrl_skb); | |
982 | self->ctrl_skb = NULL; | |
983 | } | |
984 | ||
985 | /* Free transmit buffer */ | |
986 | if (self->tx_skb) { | |
987 | dev_kfree_skb(self->tx_skb); | |
988 | self->tx_skb = NULL; | |
989 | } | |
990 | ||
991 | if (self->ircomm) { | |
992 | ircomm_close(self->ircomm); | |
993 | self->ircomm = NULL; | |
994 | } | |
995 | ||
996 | spin_unlock_irqrestore(&self->spinlock, flags); | |
997 | } | |
998 | ||
999 | /* | |
1000 | * Function ircomm_tty_hangup (tty) | |
1001 | * | |
1002 | * This routine notifies the tty driver that it should hangup the tty | |
1003 | * device. | |
1004 | * | |
1005 | */ | |
1006 | static void ircomm_tty_hangup(struct tty_struct *tty) | |
1007 | { | |
1008 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
1009 | unsigned long flags; | |
1010 | ||
1011 | IRDA_DEBUG(0, "%s()\n", __FUNCTION__ ); | |
1012 | ||
1013 | IRDA_ASSERT(self != NULL, return;); | |
1014 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
1015 | ||
1016 | if (!tty) | |
1017 | return; | |
1018 | ||
1019 | /* ircomm_tty_flush_buffer(tty); */ | |
1020 | ircomm_tty_shutdown(self); | |
1021 | ||
1022 | /* I guess we need to lock here - Jean II */ | |
1023 | spin_lock_irqsave(&self->spinlock, flags); | |
1024 | self->flags &= ~ASYNC_NORMAL_ACTIVE; | |
1025 | self->tty = NULL; | |
1026 | self->open_count = 0; | |
1027 | spin_unlock_irqrestore(&self->spinlock, flags); | |
1028 | ||
1029 | wake_up_interruptible(&self->open_wait); | |
1030 | } | |
1031 | ||
1032 | /* | |
1033 | * Function ircomm_tty_send_xchar (tty, ch) | |
1034 | * | |
1035 | * This routine is used to send a high-priority XON/XOFF character to | |
1036 | * the device. | |
1037 | */ | |
1038 | static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch) | |
1039 | { | |
1040 | IRDA_DEBUG(0, "%s(), not impl\n", __FUNCTION__ ); | |
1041 | } | |
1042 | ||
1043 | /* | |
1044 | * Function ircomm_tty_start (tty) | |
1045 | * | |
1046 | * This routine notifies the tty driver that it resume sending | |
1047 | * characters to the tty device. | |
1048 | */ | |
1049 | void ircomm_tty_start(struct tty_struct *tty) | |
1050 | { | |
1051 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
1052 | ||
1053 | ircomm_flow_request(self->ircomm, FLOW_START); | |
1054 | } | |
1055 | ||
1056 | /* | |
1057 | * Function ircomm_tty_stop (tty) | |
1058 | * | |
1059 | * This routine notifies the tty driver that it should stop outputting | |
1060 | * characters to the tty device. | |
1061 | */ | |
1062 | static void ircomm_tty_stop(struct tty_struct *tty) | |
1063 | { | |
1064 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
1065 | ||
1066 | IRDA_ASSERT(self != NULL, return;); | |
1067 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
1068 | ||
1069 | ircomm_flow_request(self->ircomm, FLOW_STOP); | |
1070 | } | |
1071 | ||
1072 | /* | |
1073 | * Function ircomm_check_modem_status (self) | |
1074 | * | |
1075 | * Check for any changes in the DCE's line settings. This function should | |
1076 | * be called whenever the dce parameter settings changes, to update the | |
1077 | * flow control settings and other things | |
1078 | */ | |
1079 | void ircomm_tty_check_modem_status(struct ircomm_tty_cb *self) | |
1080 | { | |
1081 | struct tty_struct *tty; | |
1082 | int status; | |
1083 | ||
1084 | IRDA_DEBUG(0, "%s()\n", __FUNCTION__ ); | |
1085 | ||
1086 | IRDA_ASSERT(self != NULL, return;); | |
1087 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
1088 | ||
1089 | tty = self->tty; | |
1090 | ||
1091 | status = self->settings.dce; | |
1092 | ||
1093 | if (status & IRCOMM_DCE_DELTA_ANY) { | |
1094 | /*wake_up_interruptible(&self->delta_msr_wait);*/ | |
1095 | } | |
1096 | if ((self->flags & ASYNC_CHECK_CD) && (status & IRCOMM_DELTA_CD)) { | |
1097 | IRDA_DEBUG(2, | |
1098 | "%s(), ircomm%d CD now %s...\n", __FUNCTION__ , self->line, | |
1099 | (status & IRCOMM_CD) ? "on" : "off"); | |
1100 | ||
1101 | if (status & IRCOMM_CD) { | |
1102 | wake_up_interruptible(&self->open_wait); | |
1103 | } else { | |
1104 | IRDA_DEBUG(2, | |
1105 | "%s(), Doing serial hangup..\n", __FUNCTION__ ); | |
1106 | if (tty) | |
1107 | tty_hangup(tty); | |
1108 | ||
1109 | /* Hangup will remote the tty, so better break out */ | |
1110 | return; | |
1111 | } | |
1112 | } | |
1113 | if (self->flags & ASYNC_CTS_FLOW) { | |
1114 | if (tty->hw_stopped) { | |
1115 | if (status & IRCOMM_CTS) { | |
1116 | IRDA_DEBUG(2, | |
1117 | "%s(), CTS tx start...\n", __FUNCTION__ ); | |
1118 | tty->hw_stopped = 0; | |
1119 | ||
1120 | /* Wake up processes blocked on open */ | |
1121 | wake_up_interruptible(&self->open_wait); | |
1122 | ||
1123 | schedule_work(&self->tqueue); | |
1124 | return; | |
1125 | } | |
1126 | } else { | |
1127 | if (!(status & IRCOMM_CTS)) { | |
1128 | IRDA_DEBUG(2, | |
1129 | "%s(), CTS tx stop...\n", __FUNCTION__ ); | |
1130 | tty->hw_stopped = 1; | |
1131 | } | |
1132 | } | |
1133 | } | |
1134 | } | |
1135 | ||
1136 | /* | |
1137 | * Function ircomm_tty_data_indication (instance, sap, skb) | |
1138 | * | |
1139 | * Handle incoming data, and deliver it to the line discipline | |
1140 | * | |
1141 | */ | |
1142 | static int ircomm_tty_data_indication(void *instance, void *sap, | |
1143 | struct sk_buff *skb) | |
1144 | { | |
1145 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; | |
1146 | ||
1147 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); | |
1148 | ||
1149 | IRDA_ASSERT(self != NULL, return -1;); | |
1150 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
1151 | IRDA_ASSERT(skb != NULL, return -1;); | |
1152 | ||
1153 | if (!self->tty) { | |
1154 | IRDA_DEBUG(0, "%s(), no tty!\n", __FUNCTION__ ); | |
1155 | return 0; | |
1156 | } | |
1157 | ||
1158 | /* | |
1159 | * If we receive data when hardware is stopped then something is wrong. | |
1160 | * We try to poll the peers line settings to check if we are up todate. | |
1161 | * Devices like WinCE can do this, and since they don't send any | |
1162 | * params, we can just as well declare the hardware for running. | |
1163 | */ | |
1164 | if (self->tty->hw_stopped && (self->flow == FLOW_START)) { | |
1165 | IRDA_DEBUG(0, "%s(), polling for line settings!\n", __FUNCTION__ ); | |
1166 | ircomm_param_request(self, IRCOMM_POLL, TRUE); | |
1167 | ||
1168 | /* We can just as well declare the hardware for running */ | |
1169 | ircomm_tty_send_initial_parameters(self); | |
1170 | ircomm_tty_link_established(self); | |
1171 | } | |
1172 | ||
1173 | /* | |
1174 | * Just give it over to the line discipline. There is no need to | |
1175 | * involve the flip buffers, since we are not running in an interrupt | |
1176 | * handler | |
1177 | */ | |
1178 | self->tty->ldisc.receive_buf(self->tty, skb->data, NULL, skb->len); | |
1179 | ||
1180 | /* No need to kfree_skb - see ircomm_ttp_data_indication() */ | |
1181 | ||
1182 | return 0; | |
1183 | } | |
1184 | ||
1185 | /* | |
1186 | * Function ircomm_tty_control_indication (instance, sap, skb) | |
1187 | * | |
1188 | * Parse all incoming parameters (easy!) | |
1189 | * | |
1190 | */ | |
1191 | static int ircomm_tty_control_indication(void *instance, void *sap, | |
1192 | struct sk_buff *skb) | |
1193 | { | |
1194 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; | |
1195 | int clen; | |
1196 | ||
1197 | IRDA_DEBUG(4, "%s()\n", __FUNCTION__ ); | |
1198 | ||
1199 | IRDA_ASSERT(self != NULL, return -1;); | |
1200 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
1201 | IRDA_ASSERT(skb != NULL, return -1;); | |
1202 | ||
1203 | clen = skb->data[0]; | |
1204 | ||
1205 | irda_param_extract_all(self, skb->data+1, IRDA_MIN(skb->len-1, clen), | |
1206 | &ircomm_param_info); | |
1207 | ||
1208 | /* No need to kfree_skb - see ircomm_control_indication() */ | |
1209 | ||
1210 | return 0; | |
1211 | } | |
1212 | ||
1213 | /* | |
1214 | * Function ircomm_tty_flow_indication (instance, sap, cmd) | |
1215 | * | |
1216 | * This function is called by IrTTP when it wants us to slow down the | |
1217 | * transmission of data. We just mark the hardware as stopped, and wait | |
1218 | * for IrTTP to notify us that things are OK again. | |
1219 | */ | |
1220 | static void ircomm_tty_flow_indication(void *instance, void *sap, | |
1221 | LOCAL_FLOW cmd) | |
1222 | { | |
1223 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; | |
1224 | struct tty_struct *tty; | |
1225 | ||
1226 | IRDA_ASSERT(self != NULL, return;); | |
1227 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
1228 | ||
1229 | tty = self->tty; | |
1230 | ||
1231 | switch (cmd) { | |
1232 | case FLOW_START: | |
1233 | IRDA_DEBUG(2, "%s(), hw start!\n", __FUNCTION__ ); | |
1234 | tty->hw_stopped = 0; | |
1235 | ||
1236 | /* ircomm_tty_do_softint will take care of the rest */ | |
1237 | schedule_work(&self->tqueue); | |
1238 | break; | |
1239 | default: /* If we get here, something is very wrong, better stop */ | |
1240 | case FLOW_STOP: | |
1241 | IRDA_DEBUG(2, "%s(), hw stopped!\n", __FUNCTION__ ); | |
1242 | tty->hw_stopped = 1; | |
1243 | break; | |
1244 | } | |
1245 | self->flow = cmd; | |
1246 | } | |
1247 | ||
1248 | static int ircomm_tty_line_info(struct ircomm_tty_cb *self, char *buf) | |
1249 | { | |
1250 | int ret=0; | |
1251 | ||
1252 | ret += sprintf(buf+ret, "State: %s\n", ircomm_tty_state[self->state]); | |
1253 | ||
1254 | ret += sprintf(buf+ret, "Service type: "); | |
1255 | if (self->service_type & IRCOMM_9_WIRE) | |
1256 | ret += sprintf(buf+ret, "9_WIRE"); | |
1257 | else if (self->service_type & IRCOMM_3_WIRE) | |
1258 | ret += sprintf(buf+ret, "3_WIRE"); | |
1259 | else if (self->service_type & IRCOMM_3_WIRE_RAW) | |
1260 | ret += sprintf(buf+ret, "3_WIRE_RAW"); | |
1261 | else | |
1262 | ret += sprintf(buf+ret, "No common service type!\n"); | |
1263 | ret += sprintf(buf+ret, "\n"); | |
1264 | ||
1265 | ret += sprintf(buf+ret, "Port name: %s\n", self->settings.port_name); | |
1266 | ||
1267 | ret += sprintf(buf+ret, "DTE status: "); | |
1268 | if (self->settings.dte & IRCOMM_RTS) | |
1269 | ret += sprintf(buf+ret, "RTS|"); | |
1270 | if (self->settings.dte & IRCOMM_DTR) | |
1271 | ret += sprintf(buf+ret, "DTR|"); | |
1272 | if (self->settings.dte) | |
1273 | ret--; /* remove the last | */ | |
1274 | ret += sprintf(buf+ret, "\n"); | |
1275 | ||
1276 | ret += sprintf(buf+ret, "DCE status: "); | |
1277 | if (self->settings.dce & IRCOMM_CTS) | |
1278 | ret += sprintf(buf+ret, "CTS|"); | |
1279 | if (self->settings.dce & IRCOMM_DSR) | |
1280 | ret += sprintf(buf+ret, "DSR|"); | |
1281 | if (self->settings.dce & IRCOMM_CD) | |
1282 | ret += sprintf(buf+ret, "CD|"); | |
1283 | if (self->settings.dce & IRCOMM_RI) | |
1284 | ret += sprintf(buf+ret, "RI|"); | |
1285 | if (self->settings.dce) | |
1286 | ret--; /* remove the last | */ | |
1287 | ret += sprintf(buf+ret, "\n"); | |
1288 | ||
1289 | ret += sprintf(buf+ret, "Configuration: "); | |
1290 | if (!self->settings.null_modem) | |
1291 | ret += sprintf(buf+ret, "DTE <-> DCE\n"); | |
1292 | else | |
1293 | ret += sprintf(buf+ret, | |
1294 | "DTE <-> DTE (null modem emulation)\n"); | |
1295 | ||
1296 | ret += sprintf(buf+ret, "Data rate: %d\n", self->settings.data_rate); | |
1297 | ||
1298 | ret += sprintf(buf+ret, "Flow control: "); | |
1299 | if (self->settings.flow_control & IRCOMM_XON_XOFF_IN) | |
1300 | ret += sprintf(buf+ret, "XON_XOFF_IN|"); | |
1301 | if (self->settings.flow_control & IRCOMM_XON_XOFF_OUT) | |
1302 | ret += sprintf(buf+ret, "XON_XOFF_OUT|"); | |
1303 | if (self->settings.flow_control & IRCOMM_RTS_CTS_IN) | |
1304 | ret += sprintf(buf+ret, "RTS_CTS_IN|"); | |
1305 | if (self->settings.flow_control & IRCOMM_RTS_CTS_OUT) | |
1306 | ret += sprintf(buf+ret, "RTS_CTS_OUT|"); | |
1307 | if (self->settings.flow_control & IRCOMM_DSR_DTR_IN) | |
1308 | ret += sprintf(buf+ret, "DSR_DTR_IN|"); | |
1309 | if (self->settings.flow_control & IRCOMM_DSR_DTR_OUT) | |
1310 | ret += sprintf(buf+ret, "DSR_DTR_OUT|"); | |
1311 | if (self->settings.flow_control & IRCOMM_ENQ_ACK_IN) | |
1312 | ret += sprintf(buf+ret, "ENQ_ACK_IN|"); | |
1313 | if (self->settings.flow_control & IRCOMM_ENQ_ACK_OUT) | |
1314 | ret += sprintf(buf+ret, "ENQ_ACK_OUT|"); | |
1315 | if (self->settings.flow_control) | |
1316 | ret--; /* remove the last | */ | |
1317 | ret += sprintf(buf+ret, "\n"); | |
1318 | ||
1319 | ret += sprintf(buf+ret, "Flags: "); | |
1320 | if (self->flags & ASYNC_CTS_FLOW) | |
1321 | ret += sprintf(buf+ret, "ASYNC_CTS_FLOW|"); | |
1322 | if (self->flags & ASYNC_CHECK_CD) | |
1323 | ret += sprintf(buf+ret, "ASYNC_CHECK_CD|"); | |
1324 | if (self->flags & ASYNC_INITIALIZED) | |
1325 | ret += sprintf(buf+ret, "ASYNC_INITIALIZED|"); | |
1326 | if (self->flags & ASYNC_LOW_LATENCY) | |
1327 | ret += sprintf(buf+ret, "ASYNC_LOW_LATENCY|"); | |
1328 | if (self->flags & ASYNC_CLOSING) | |
1329 | ret += sprintf(buf+ret, "ASYNC_CLOSING|"); | |
1330 | if (self->flags & ASYNC_NORMAL_ACTIVE) | |
1331 | ret += sprintf(buf+ret, "ASYNC_NORMAL_ACTIVE|"); | |
1332 | if (self->flags) | |
1333 | ret--; /* remove the last | */ | |
1334 | ret += sprintf(buf+ret, "\n"); | |
1335 | ||
1336 | ret += sprintf(buf+ret, "Role: %s\n", self->client ? | |
1337 | "client" : "server"); | |
1338 | ret += sprintf(buf+ret, "Open count: %d\n", self->open_count); | |
1339 | ret += sprintf(buf+ret, "Max data size: %d\n", self->max_data_size); | |
1340 | ret += sprintf(buf+ret, "Max header size: %d\n", self->max_header_size); | |
1341 | ||
1342 | if (self->tty) | |
1343 | ret += sprintf(buf+ret, "Hardware: %s\n", | |
1344 | self->tty->hw_stopped ? "Stopped" : "Running"); | |
1345 | ||
1346 | ret += sprintf(buf+ret, "\n"); | |
1347 | return ret; | |
1348 | } | |
1349 | ||
1350 | ||
1351 | /* | |
1352 | * Function ircomm_tty_read_proc (buf, start, offset, len, eof, unused) | |
1353 | * | |
1354 | * | |
1355 | * | |
1356 | */ | |
1357 | #ifdef CONFIG_PROC_FS | |
1358 | static int ircomm_tty_read_proc(char *buf, char **start, off_t offset, int len, | |
1359 | int *eof, void *unused) | |
1360 | { | |
1361 | struct ircomm_tty_cb *self; | |
1362 | int count = 0, l; | |
1363 | off_t begin = 0; | |
1364 | unsigned long flags; | |
1365 | ||
1366 | spin_lock_irqsave(&ircomm_tty->hb_spinlock, flags); | |
1367 | ||
1368 | self = (struct ircomm_tty_cb *) hashbin_get_first(ircomm_tty); | |
1369 | while ((self != NULL) && (count < 4000)) { | |
1370 | if (self->magic != IRCOMM_TTY_MAGIC) | |
1371 | break; | |
1372 | ||
1373 | l = ircomm_tty_line_info(self, buf + count); | |
1374 | count += l; | |
1375 | if (count+begin > offset+len) | |
1376 | goto done; | |
1377 | if (count+begin < offset) { | |
1378 | begin += count; | |
1379 | count = 0; | |
1380 | } | |
1381 | ||
1382 | self = (struct ircomm_tty_cb *) hashbin_get_next(ircomm_tty); | |
1383 | } | |
1384 | *eof = 1; | |
1385 | done: | |
1386 | spin_unlock_irqrestore(&ircomm_tty->hb_spinlock, flags); | |
1387 | ||
1388 | if (offset >= count+begin) | |
1389 | return 0; | |
1390 | *start = buf + (offset-begin); | |
1391 | return ((len < begin+count-offset) ? len : begin+count-offset); | |
1392 | } | |
1393 | #endif /* CONFIG_PROC_FS */ | |
1394 | ||
1395 | MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>"); | |
1396 | MODULE_DESCRIPTION("IrCOMM serial TTY driver"); | |
1397 | MODULE_LICENSE("GPL"); | |
1398 | MODULE_ALIAS_CHARDEV_MAJOR(IRCOMM_TTY_MAJOR); | |
1399 | ||
1400 | module_init(ircomm_tty_init); | |
1401 | module_exit(ircomm_tty_cleanup); |