diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
---|---|---|
committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/irda/ircomm/ircomm_tty.c |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'net/irda/ircomm/ircomm_tty.c')
-rw-r--r-- | net/irda/ircomm/ircomm_tty.c | 1405 |
1 files changed, 1405 insertions, 0 deletions
diff --git a/net/irda/ircomm/ircomm_tty.c b/net/irda/ircomm/ircomm_tty.c new file mode 100644 index 000000000000..5d1e61168eb7 --- /dev/null +++ b/net/irda/ircomm/ircomm_tty.c | |||
@@ -0,0 +1,1405 @@ | |||
1 | /********************************************************************* | ||
2 | * | ||
3 | * Filename: ircomm_tty.c | ||
4 | * Version: 1.0 | ||
5 | * Description: IrCOMM serial TTY driver | ||
6 | * Status: Experimental. | ||
7 | * Author: Dag Brattli <dagb@cs.uit.no> | ||
8 | * Created at: Sun Jun 6 21:00:56 1999 | ||
9 | * Modified at: Wed Feb 23 00:09:02 2000 | ||
10 | * Modified by: Dag Brattli <dagb@cs.uit.no> | ||
11 | * Sources: serial.c and previous IrCOMM work by Takahide Higuchi | ||
12 | * | ||
13 | * Copyright (c) 1999-2000 Dag Brattli, All Rights Reserved. | ||
14 | * Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com> | ||
15 | * | ||
16 | * This program is free software; you can redistribute it and/or | ||
17 | * modify it under the terms of the GNU General Public License as | ||
18 | * published by the Free Software Foundation; either version 2 of | ||
19 | * the License, or (at your option) any later version. | ||
20 | * | ||
21 | * This program is distributed in the hope that it will be useful, | ||
22 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
23 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
24 | * GNU General Public License for more details. | ||
25 | * | ||
26 | * You should have received a copy of the GNU General Public License | ||
27 | * along with this program; if not, write to the Free Software | ||
28 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | ||
29 | * MA 02111-1307 USA | ||
30 | * | ||
31 | ********************************************************************/ | ||
32 | |||
33 | #include <linux/config.h> | ||
34 | #include <linux/init.h> | ||
35 | #include <linux/module.h> | ||
36 | #include <linux/fs.h> | ||
37 | #include <linux/sched.h> | ||
38 | #include <linux/termios.h> | ||
39 | #include <linux/tty.h> | ||
40 | #include <linux/interrupt.h> | ||
41 | #include <linux/device.h> /* for MODULE_ALIAS_CHARDEV_MAJOR */ | ||
42 | |||
43 | #include <asm/uaccess.h> | ||
44 | |||
45 | #include <net/irda/irda.h> | ||
46 | #include <net/irda/irmod.h> | ||
47 | |||
48 | #include <net/irda/ircomm_core.h> | ||
49 | #include <net/irda/ircomm_param.h> | ||
50 | #include <net/irda/ircomm_tty_attach.h> | ||
51 | #include <net/irda/ircomm_tty.h> | ||
52 | |||
53 | static int ircomm_tty_open(struct tty_struct *tty, struct file *filp); | ||
54 | static void ircomm_tty_close(struct tty_struct * tty, struct file *filp); | ||
55 | static int ircomm_tty_write(struct tty_struct * tty, | ||
56 | const unsigned char *buf, int count); | ||
57 | static int ircomm_tty_write_room(struct tty_struct *tty); | ||
58 | static void ircomm_tty_throttle(struct tty_struct *tty); | ||
59 | static void ircomm_tty_unthrottle(struct tty_struct *tty); | ||
60 | static int ircomm_tty_chars_in_buffer(struct tty_struct *tty); | ||
61 | static void ircomm_tty_flush_buffer(struct tty_struct *tty); | ||
62 | static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch); | ||
63 | static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout); | ||
64 | static void ircomm_tty_hangup(struct tty_struct *tty); | ||
65 | static void ircomm_tty_do_softint(void *private_); | ||
66 | static void ircomm_tty_shutdown(struct ircomm_tty_cb *self); | ||
67 | static void ircomm_tty_stop(struct tty_struct *tty); | ||
68 | |||
69 | static int ircomm_tty_data_indication(void *instance, void *sap, | ||
70 | struct sk_buff *skb); | ||
71 | static int ircomm_tty_control_indication(void *instance, void *sap, | ||
72 | struct sk_buff *skb); | ||
73 | static void ircomm_tty_flow_indication(void *instance, void *sap, | ||
74 | LOCAL_FLOW cmd); | ||
75 | #ifdef CONFIG_PROC_FS | ||
76 | static int ircomm_tty_read_proc(char *buf, char **start, off_t offset, int len, | ||
77 | int *eof, void *unused); | ||
78 | #endif /* CONFIG_PROC_FS */ | ||
79 | static struct tty_driver *driver; | ||
80 | |||
81 | hashbin_t *ircomm_tty = NULL; | ||
82 | |||
83 | static struct tty_operations ops = { | ||
84 | .open = ircomm_tty_open, | ||
85 | .close = ircomm_tty_close, | ||
86 | .write = ircomm_tty_write, | ||
87 | .write_room = ircomm_tty_write_room, | ||
88 | .chars_in_buffer = ircomm_tty_chars_in_buffer, | ||
89 | .flush_buffer = ircomm_tty_flush_buffer, | ||
90 | .ioctl = ircomm_tty_ioctl, /* ircomm_tty_ioctl.c */ | ||
91 | .tiocmget = ircomm_tty_tiocmget, /* ircomm_tty_ioctl.c */ | ||
92 | .tiocmset = ircomm_tty_tiocmset, /* ircomm_tty_ioctl.c */ | ||
93 | .throttle = ircomm_tty_throttle, | ||
94 | .unthrottle = ircomm_tty_unthrottle, | ||
95 | .send_xchar = ircomm_tty_send_xchar, | ||
96 | .set_termios = ircomm_tty_set_termios, | ||
97 | .stop = ircomm_tty_stop, | ||
98 | .start = ircomm_tty_start, | ||
99 | .hangup = ircomm_tty_hangup, | ||
100 | .wait_until_sent = ircomm_tty_wait_until_sent, | ||
101 | #ifdef CONFIG_PROC_FS | ||
102 | .read_proc = ircomm_tty_read_proc, | ||
103 | #endif /* CONFIG_PROC_FS */ | ||
104 | }; | ||
105 | |||
106 | /* | ||
107 | * Function ircomm_tty_init() | ||
108 | * | ||
109 | * Init IrCOMM TTY layer/driver | ||
110 | * | ||
111 | */ | ||
112 | static int __init ircomm_tty_init(void) | ||
113 | { | ||
114 | driver = alloc_tty_driver(IRCOMM_TTY_PORTS); | ||
115 | if (!driver) | ||
116 | return -ENOMEM; | ||
117 | ircomm_tty = hashbin_new(HB_LOCK); | ||
118 | if (ircomm_tty == NULL) { | ||
119 | IRDA_ERROR("%s(), can't allocate hashbin!\n", __FUNCTION__); | ||
120 | put_tty_driver(driver); | ||
121 | return -ENOMEM; | ||
122 | } | ||
123 | |||
124 | driver->owner = THIS_MODULE; | ||
125 | driver->driver_name = "ircomm"; | ||
126 | driver->name = "ircomm"; | ||
127 | driver->devfs_name = "ircomm"; | ||
128 | driver->major = IRCOMM_TTY_MAJOR; | ||
129 | driver->minor_start = IRCOMM_TTY_MINOR; | ||
130 | driver->type = TTY_DRIVER_TYPE_SERIAL; | ||
131 | driver->subtype = SERIAL_TYPE_NORMAL; | ||
132 | driver->init_termios = tty_std_termios; | ||
133 | driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; | ||
134 | driver->flags = TTY_DRIVER_REAL_RAW; | ||
135 | tty_set_operations(driver, &ops); | ||
136 | if (tty_register_driver(driver)) { | ||
137 | IRDA_ERROR("%s(): Couldn't register serial driver\n", | ||
138 | __FUNCTION__); | ||
139 | put_tty_driver(driver); | ||
140 | return -1; | ||
141 | } | ||
142 | return 0; | ||
143 | } | ||
144 | |||
145 | static void __exit __ircomm_tty_cleanup(struct ircomm_tty_cb *self) | ||
146 | { | ||
147 | IRDA_DEBUG(0, "%s()\n", __FUNCTION__ ); | ||
148 | |||
149 | IRDA_ASSERT(self != NULL, return;); | ||
150 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | ||
151 | |||
152 | ircomm_tty_shutdown(self); | ||
153 | |||
154 | self->magic = 0; | ||
155 | kfree(self); | ||
156 | } | ||
157 | |||
158 | /* | ||
159 | * Function ircomm_tty_cleanup () | ||
160 | * | ||
161 | * Remove IrCOMM TTY layer/driver | ||
162 | * | ||
163 | */ | ||
164 | static void __exit ircomm_tty_cleanup(void) | ||
165 | { | ||
166 | int ret; | ||
167 | |||
168 | IRDA_DEBUG(4, "%s()\n", __FUNCTION__ ); | ||
169 | |||
170 | ret = tty_unregister_driver(driver); | ||
171 | if (ret) { | ||
172 | IRDA_ERROR("%s(), failed to unregister driver\n", | ||
173 | __FUNCTION__); | ||
174 | return; | ||
175 | } | ||
176 | |||
177 | hashbin_delete(ircomm_tty, (FREE_FUNC) __ircomm_tty_cleanup); | ||
178 | put_tty_driver(driver); | ||
179 | } | ||
180 | |||
181 | /* | ||
182 | * Function ircomm_startup (self) | ||
183 | * | ||
184 | * | ||
185 | * | ||
186 | */ | ||
187 | static int ircomm_tty_startup(struct ircomm_tty_cb *self) | ||
188 | { | ||
189 | notify_t notify; | ||
190 | int ret = -ENODEV; | ||
191 | |||
192 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); | ||
193 | |||
194 | IRDA_ASSERT(self != NULL, return -1;); | ||
195 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | ||
196 | |||
197 | /* Check if already open */ | ||
198 | if (test_and_set_bit(ASYNC_B_INITIALIZED, &self->flags)) { | ||
199 | IRDA_DEBUG(2, "%s(), already open so break out!\n", __FUNCTION__ ); | ||
200 | return 0; | ||
201 | } | ||
202 | |||
203 | /* Register with IrCOMM */ | ||
204 | irda_notify_init(¬ify); | ||
205 | /* These callbacks we must handle ourselves */ | ||
206 | notify.data_indication = ircomm_tty_data_indication; | ||
207 | notify.udata_indication = ircomm_tty_control_indication; | ||
208 | notify.flow_indication = ircomm_tty_flow_indication; | ||
209 | |||
210 | /* Use the ircomm_tty interface for these ones */ | ||
211 | notify.disconnect_indication = ircomm_tty_disconnect_indication; | ||
212 | notify.connect_confirm = ircomm_tty_connect_confirm; | ||
213 | notify.connect_indication = ircomm_tty_connect_indication; | ||
214 | strlcpy(notify.name, "ircomm_tty", sizeof(notify.name)); | ||
215 | notify.instance = self; | ||
216 | |||
217 | if (!self->ircomm) { | ||
218 | self->ircomm = ircomm_open(¬ify, self->service_type, | ||
219 | self->line); | ||
220 | } | ||
221 | if (!self->ircomm) | ||
222 | goto err; | ||
223 | |||
224 | self->slsap_sel = self->ircomm->slsap_sel; | ||
225 | |||
226 | /* Connect IrCOMM link with remote device */ | ||
227 | ret = ircomm_tty_attach_cable(self); | ||
228 | if (ret < 0) { | ||
229 | IRDA_ERROR("%s(), error attaching cable!\n", __FUNCTION__); | ||
230 | goto err; | ||
231 | } | ||
232 | |||
233 | return 0; | ||
234 | err: | ||
235 | clear_bit(ASYNC_B_INITIALIZED, &self->flags); | ||
236 | return ret; | ||
237 | } | ||
238 | |||
239 | /* | ||
240 | * Function ircomm_block_til_ready (self, filp) | ||
241 | * | ||
242 | * | ||
243 | * | ||
244 | */ | ||
245 | static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self, | ||
246 | struct file *filp) | ||
247 | { | ||
248 | DECLARE_WAITQUEUE(wait, current); | ||
249 | int retval; | ||
250 | int do_clocal = 0, extra_count = 0; | ||
251 | unsigned long flags; | ||
252 | struct tty_struct *tty; | ||
253 | |||
254 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); | ||
255 | |||
256 | tty = self->tty; | ||
257 | |||
258 | /* | ||
259 | * If non-blocking mode is set, or the port is not enabled, | ||
260 | * then make the check up front and then exit. | ||
261 | */ | ||
262 | if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){ | ||
263 | /* nonblock mode is set or port is not enabled */ | ||
264 | self->flags |= ASYNC_NORMAL_ACTIVE; | ||
265 | IRDA_DEBUG(1, "%s(), O_NONBLOCK requested!\n", __FUNCTION__ ); | ||
266 | return 0; | ||
267 | } | ||
268 | |||
269 | if (tty->termios->c_cflag & CLOCAL) { | ||
270 | IRDA_DEBUG(1, "%s(), doing CLOCAL!\n", __FUNCTION__ ); | ||
271 | do_clocal = 1; | ||
272 | } | ||
273 | |||
274 | /* Wait for carrier detect and the line to become | ||
275 | * free (i.e., not in use by the callout). While we are in | ||
276 | * this loop, self->open_count is dropped by one, so that | ||
277 | * mgsl_close() knows when to free things. We restore it upon | ||
278 | * exit, either normal or abnormal. | ||
279 | */ | ||
280 | |||
281 | retval = 0; | ||
282 | add_wait_queue(&self->open_wait, &wait); | ||
283 | |||
284 | IRDA_DEBUG(2, "%s(%d):block_til_ready before block on %s open_count=%d\n", | ||
285 | __FILE__,__LINE__, tty->driver->name, self->open_count ); | ||
286 | |||
287 | /* As far as I can see, we protect open_count - Jean II */ | ||
288 | spin_lock_irqsave(&self->spinlock, flags); | ||
289 | if (!tty_hung_up_p(filp)) { | ||
290 | extra_count = 1; | ||
291 | self->open_count--; | ||
292 | } | ||
293 | spin_unlock_irqrestore(&self->spinlock, flags); | ||
294 | self->blocked_open++; | ||
295 | |||
296 | while (1) { | ||
297 | if (tty->termios->c_cflag & CBAUD) { | ||
298 | /* Here, we use to lock those two guys, but | ||
299 | * as ircomm_param_request() does it itself, | ||
300 | * I don't see the point (and I see the deadlock). | ||
301 | * Jean II */ | ||
302 | self->settings.dte |= IRCOMM_RTS + IRCOMM_DTR; | ||
303 | |||
304 | ircomm_param_request(self, IRCOMM_DTE, TRUE); | ||
305 | } | ||
306 | |||
307 | current->state = TASK_INTERRUPTIBLE; | ||
308 | |||
309 | if (tty_hung_up_p(filp) || | ||
310 | !test_bit(ASYNC_B_INITIALIZED, &self->flags)) { | ||
311 | retval = (self->flags & ASYNC_HUP_NOTIFY) ? | ||
312 | -EAGAIN : -ERESTARTSYS; | ||
313 | break; | ||
314 | } | ||
315 | |||
316 | /* | ||
317 | * Check if link is ready now. Even if CLOCAL is | ||
318 | * specified, we cannot return before the IrCOMM link is | ||
319 | * ready | ||
320 | */ | ||
321 | if (!test_bit(ASYNC_B_CLOSING, &self->flags) && | ||
322 | (do_clocal || (self->settings.dce & IRCOMM_CD)) && | ||
323 | self->state == IRCOMM_TTY_READY) | ||
324 | { | ||
325 | break; | ||
326 | } | ||
327 | |||
328 | if (signal_pending(current)) { | ||
329 | retval = -ERESTARTSYS; | ||
330 | break; | ||
331 | } | ||
332 | |||
333 | IRDA_DEBUG(1, "%s(%d):block_til_ready blocking on %s open_count=%d\n", | ||
334 | __FILE__,__LINE__, tty->driver->name, self->open_count ); | ||
335 | |||
336 | schedule(); | ||
337 | } | ||
338 | |||
339 | __set_current_state(TASK_RUNNING); | ||
340 | remove_wait_queue(&self->open_wait, &wait); | ||
341 | |||
342 | if (extra_count) { | ||
343 | /* ++ is not atomic, so this should be protected - Jean II */ | ||
344 | spin_lock_irqsave(&self->spinlock, flags); | ||
345 | self->open_count++; | ||
346 | spin_unlock_irqrestore(&self->spinlock, flags); | ||
347 | } | ||
348 | self->blocked_open--; | ||
349 | |||
350 | IRDA_DEBUG(1, "%s(%d):block_til_ready after blocking on %s open_count=%d\n", | ||
351 | __FILE__,__LINE__, tty->driver->name, self->open_count); | ||
352 | |||
353 | if (!retval) | ||
354 | self->flags |= ASYNC_NORMAL_ACTIVE; | ||
355 | |||
356 | return retval; | ||
357 | } | ||
358 | |||
359 | /* | ||
360 | * Function ircomm_tty_open (tty, filp) | ||
361 | * | ||
362 | * This routine is called when a particular tty device is opened. This | ||
363 | * routine is mandatory; if this routine is not filled in, the attempted | ||
364 | * open will fail with ENODEV. | ||
365 | */ | ||
366 | static int ircomm_tty_open(struct tty_struct *tty, struct file *filp) | ||
367 | { | ||
368 | struct ircomm_tty_cb *self; | ||
369 | unsigned int line; | ||
370 | unsigned long flags; | ||
371 | int ret; | ||
372 | |||
373 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); | ||
374 | |||
375 | line = tty->index; | ||
376 | if ((line < 0) || (line >= IRCOMM_TTY_PORTS)) { | ||
377 | return -ENODEV; | ||
378 | } | ||
379 | |||
380 | /* Check if instance already exists */ | ||
381 | self = hashbin_lock_find(ircomm_tty, line, NULL); | ||
382 | if (!self) { | ||
383 | /* No, so make new instance */ | ||
384 | self = kmalloc(sizeof(struct ircomm_tty_cb), GFP_KERNEL); | ||
385 | if (self == NULL) { | ||
386 | IRDA_ERROR("%s(), kmalloc failed!\n", __FUNCTION__); | ||
387 | return -ENOMEM; | ||
388 | } | ||
389 | memset(self, 0, sizeof(struct ircomm_tty_cb)); | ||
390 | |||
391 | self->magic = IRCOMM_TTY_MAGIC; | ||
392 | self->flow = FLOW_STOP; | ||
393 | |||
394 | self->line = line; | ||
395 | INIT_WORK(&self->tqueue, ircomm_tty_do_softint, self); | ||
396 | self->max_header_size = IRCOMM_TTY_HDR_UNINITIALISED; | ||
397 | self->max_data_size = IRCOMM_TTY_DATA_UNINITIALISED; | ||
398 | self->close_delay = 5*HZ/10; | ||
399 | self->closing_wait = 30*HZ; | ||
400 | |||
401 | /* Init some important stuff */ | ||
402 | init_timer(&self->watchdog_timer); | ||
403 | init_waitqueue_head(&self->open_wait); | ||
404 | init_waitqueue_head(&self->close_wait); | ||
405 | spin_lock_init(&self->spinlock); | ||
406 | |||
407 | /* | ||
408 | * Force TTY into raw mode by default which is usually what | ||
409 | * we want for IrCOMM and IrLPT. This way applications will | ||
410 | * not have to twiddle with printcap etc. | ||
411 | */ | ||
412 | tty->termios->c_iflag = 0; | ||
413 | tty->termios->c_oflag = 0; | ||
414 | |||
415 | /* Insert into hash */ | ||
416 | hashbin_insert(ircomm_tty, (irda_queue_t *) self, line, NULL); | ||
417 | } | ||
418 | /* ++ is not atomic, so this should be protected - Jean II */ | ||
419 | spin_lock_irqsave(&self->spinlock, flags); | ||
420 | self->open_count++; | ||
421 | |||
422 | tty->driver_data = self; | ||
423 | self->tty = tty; | ||
424 | spin_unlock_irqrestore(&self->spinlock, flags); | ||
425 | |||
426 | IRDA_DEBUG(1, "%s(), %s%d, count = %d\n", __FUNCTION__ , tty->driver->name, | ||
427 | self->line, self->open_count); | ||
428 | |||
429 | /* Not really used by us, but lets do it anyway */ | ||
430 | self->tty->low_latency = (self->flags & ASYNC_LOW_LATENCY) ? 1 : 0; | ||
431 | |||
432 | /* | ||
433 | * If the port is the middle of closing, bail out now | ||
434 | */ | ||
435 | if (tty_hung_up_p(filp) || | ||
436 | test_bit(ASYNC_B_CLOSING, &self->flags)) { | ||
437 | |||
438 | /* Hm, why are we blocking on ASYNC_CLOSING if we | ||
439 | * do return -EAGAIN/-ERESTARTSYS below anyway? | ||
440 | * IMHO it's either not needed in the first place | ||
441 | * or for some reason we need to make sure the async | ||
442 | * closing has been finished - if so, wouldn't we | ||
443 | * probably better sleep uninterruptible? | ||
444 | */ | ||
445 | |||
446 | if (wait_event_interruptible(self->close_wait, !test_bit(ASYNC_B_CLOSING, &self->flags))) { | ||
447 | IRDA_WARNING("%s - got signal while blocking on ASYNC_CLOSING!\n", | ||
448 | __FUNCTION__); | ||
449 | return -ERESTARTSYS; | ||
450 | } | ||
451 | |||
452 | #ifdef SERIAL_DO_RESTART | ||
453 | return ((self->flags & ASYNC_HUP_NOTIFY) ? | ||
454 | -EAGAIN : -ERESTARTSYS); | ||
455 | #else | ||
456 | return -EAGAIN; | ||
457 | #endif | ||
458 | } | ||
459 | |||
460 | /* Check if this is a "normal" ircomm device, or an irlpt device */ | ||
461 | if (line < 0x10) { | ||
462 | self->service_type = IRCOMM_3_WIRE | IRCOMM_9_WIRE; | ||
463 | self->settings.service_type = IRCOMM_9_WIRE; /* 9 wire as default */ | ||
464 | /* Jan Kiszka -> add DSR/RI -> Conform to IrCOMM spec */ | ||
465 | self->settings.dce = IRCOMM_CTS | IRCOMM_CD | IRCOMM_DSR | IRCOMM_RI; /* Default line settings */ | ||
466 | IRDA_DEBUG(2, "%s(), IrCOMM device\n", __FUNCTION__ ); | ||
467 | } else { | ||
468 | IRDA_DEBUG(2, "%s(), IrLPT device\n", __FUNCTION__ ); | ||
469 | self->service_type = IRCOMM_3_WIRE_RAW; | ||
470 | self->settings.service_type = IRCOMM_3_WIRE_RAW; /* Default */ | ||
471 | } | ||
472 | |||
473 | ret = ircomm_tty_startup(self); | ||
474 | if (ret) | ||
475 | return ret; | ||
476 | |||
477 | ret = ircomm_tty_block_til_ready(self, filp); | ||
478 | if (ret) { | ||
479 | IRDA_DEBUG(2, | ||
480 | "%s(), returning after block_til_ready with %d\n", __FUNCTION__ , | ||
481 | ret); | ||
482 | |||
483 | return ret; | ||
484 | } | ||
485 | return 0; | ||
486 | } | ||
487 | |||
488 | /* | ||
489 | * Function ircomm_tty_close (tty, filp) | ||
490 | * | ||
491 | * This routine is called when a particular tty device is closed. | ||
492 | * | ||
493 | */ | ||
494 | static void ircomm_tty_close(struct tty_struct *tty, struct file *filp) | ||
495 | { | ||
496 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | ||
497 | unsigned long flags; | ||
498 | |||
499 | IRDA_DEBUG(0, "%s()\n", __FUNCTION__ ); | ||
500 | |||
501 | if (!tty) | ||
502 | return; | ||
503 | |||
504 | IRDA_ASSERT(self != NULL, return;); | ||
505 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | ||
506 | |||
507 | spin_lock_irqsave(&self->spinlock, flags); | ||
508 | |||
509 | if (tty_hung_up_p(filp)) { | ||
510 | spin_unlock_irqrestore(&self->spinlock, flags); | ||
511 | |||
512 | IRDA_DEBUG(0, "%s(), returning 1\n", __FUNCTION__ ); | ||
513 | return; | ||
514 | } | ||
515 | |||
516 | if ((tty->count == 1) && (self->open_count != 1)) { | ||
517 | /* | ||
518 | * Uh, oh. tty->count is 1, which means that the tty | ||
519 | * structure will be freed. state->count should always | ||
520 | * be one in these conditions. If it's greater than | ||
521 | * one, we've got real problems, since it means the | ||
522 | * serial port won't be shutdown. | ||
523 | */ | ||
524 | IRDA_DEBUG(0, "%s(), bad serial port count; " | ||
525 | "tty->count is 1, state->count is %d\n", __FUNCTION__ , | ||
526 | self->open_count); | ||
527 | self->open_count = 1; | ||
528 | } | ||
529 | |||
530 | if (--self->open_count < 0) { | ||
531 | IRDA_ERROR("%s(), bad serial port count for ttys%d: %d\n", | ||
532 | __FUNCTION__, self->line, self->open_count); | ||
533 | self->open_count = 0; | ||
534 | } | ||
535 | if (self->open_count) { | ||
536 | spin_unlock_irqrestore(&self->spinlock, flags); | ||
537 | |||
538 | IRDA_DEBUG(0, "%s(), open count > 0\n", __FUNCTION__ ); | ||
539 | return; | ||
540 | } | ||
541 | |||
542 | /* Hum... Should be test_and_set_bit ??? - Jean II */ | ||
543 | set_bit(ASYNC_B_CLOSING, &self->flags); | ||
544 | |||
545 | /* We need to unlock here (we were unlocking at the end of this | ||
546 | * function), because tty_wait_until_sent() may schedule. | ||
547 | * I don't know if the rest should be protected somehow, | ||
548 | * so someone should check. - Jean II */ | ||
549 | spin_unlock_irqrestore(&self->spinlock, flags); | ||
550 | |||
551 | /* | ||
552 | * Now we wait for the transmit buffer to clear; and we notify | ||
553 | * the line discipline to only process XON/XOFF characters. | ||
554 | */ | ||
555 | tty->closing = 1; | ||
556 | if (self->closing_wait != ASYNC_CLOSING_WAIT_NONE) | ||
557 | tty_wait_until_sent(tty, self->closing_wait); | ||
558 | |||
559 | ircomm_tty_shutdown(self); | ||
560 | |||
561 | if (tty->driver->flush_buffer) | ||
562 | tty->driver->flush_buffer(tty); | ||
563 | if (tty->ldisc.flush_buffer) | ||
564 | tty->ldisc.flush_buffer(tty); | ||
565 | |||
566 | tty->closing = 0; | ||
567 | self->tty = NULL; | ||
568 | |||
569 | if (self->blocked_open) { | ||
570 | if (self->close_delay) { | ||
571 | current->state = TASK_INTERRUPTIBLE; | ||
572 | schedule_timeout(self->close_delay); | ||
573 | } | ||
574 | wake_up_interruptible(&self->open_wait); | ||
575 | } | ||
576 | |||
577 | self->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING); | ||
578 | wake_up_interruptible(&self->close_wait); | ||
579 | } | ||
580 | |||
581 | /* | ||
582 | * Function ircomm_tty_flush_buffer (tty) | ||
583 | * | ||
584 | * | ||
585 | * | ||
586 | */ | ||
587 | static void ircomm_tty_flush_buffer(struct tty_struct *tty) | ||
588 | { | ||
589 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | ||
590 | |||
591 | IRDA_ASSERT(self != NULL, return;); | ||
592 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | ||
593 | |||
594 | /* | ||
595 | * Let do_softint() do this to avoid race condition with | ||
596 | * do_softint() ;-) | ||
597 | */ | ||
598 | schedule_work(&self->tqueue); | ||
599 | } | ||
600 | |||
601 | /* | ||
602 | * Function ircomm_tty_do_softint (private_) | ||
603 | * | ||
604 | * We use this routine to give the write wakeup to the user at at a | ||
605 | * safe time (as fast as possible after write have completed). This | ||
606 | * can be compared to the Tx interrupt. | ||
607 | */ | ||
608 | static void ircomm_tty_do_softint(void *private_) | ||
609 | { | ||
610 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) private_; | ||
611 | struct tty_struct *tty; | ||
612 | unsigned long flags; | ||
613 | struct sk_buff *skb, *ctrl_skb; | ||
614 | |||
615 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); | ||
616 | |||
617 | if (!self || self->magic != IRCOMM_TTY_MAGIC) | ||
618 | return; | ||
619 | |||
620 | tty = self->tty; | ||
621 | if (!tty) | ||
622 | return; | ||
623 | |||
624 | /* Unlink control buffer */ | ||
625 | spin_lock_irqsave(&self->spinlock, flags); | ||
626 | |||
627 | ctrl_skb = self->ctrl_skb; | ||
628 | self->ctrl_skb = NULL; | ||
629 | |||
630 | spin_unlock_irqrestore(&self->spinlock, flags); | ||
631 | |||
632 | /* Flush control buffer if any */ | ||
633 | if(ctrl_skb) { | ||
634 | if(self->flow == FLOW_START) | ||
635 | ircomm_control_request(self->ircomm, ctrl_skb); | ||
636 | /* Drop reference count - see ircomm_ttp_data_request(). */ | ||
637 | dev_kfree_skb(ctrl_skb); | ||
638 | } | ||
639 | |||
640 | if (tty->hw_stopped) | ||
641 | return; | ||
642 | |||
643 | /* Unlink transmit buffer */ | ||
644 | spin_lock_irqsave(&self->spinlock, flags); | ||
645 | |||
646 | skb = self->tx_skb; | ||
647 | self->tx_skb = NULL; | ||
648 | |||
649 | spin_unlock_irqrestore(&self->spinlock, flags); | ||
650 | |||
651 | /* Flush transmit buffer if any */ | ||
652 | if (skb) { | ||
653 | ircomm_tty_do_event(self, IRCOMM_TTY_DATA_REQUEST, skb, NULL); | ||
654 | /* Drop reference count - see ircomm_ttp_data_request(). */ | ||
655 | dev_kfree_skb(skb); | ||
656 | } | ||
657 | |||
658 | /* Check if user (still) wants to be waken up */ | ||
659 | if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && | ||
660 | tty->ldisc.write_wakeup) | ||
661 | { | ||
662 | (tty->ldisc.write_wakeup)(tty); | ||
663 | } | ||
664 | wake_up_interruptible(&tty->write_wait); | ||
665 | } | ||
666 | |||
667 | /* | ||
668 | * Function ircomm_tty_write (tty, buf, count) | ||
669 | * | ||
670 | * This routine is called by the kernel to write a series of characters | ||
671 | * to the tty device. The characters may come from user space or kernel | ||
672 | * space. This routine will return the number of characters actually | ||
673 | * accepted for writing. This routine is mandatory. | ||
674 | */ | ||
675 | static int ircomm_tty_write(struct tty_struct *tty, | ||
676 | const unsigned char *buf, int count) | ||
677 | { | ||
678 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | ||
679 | unsigned long flags; | ||
680 | struct sk_buff *skb; | ||
681 | int tailroom = 0; | ||
682 | int len = 0; | ||
683 | int size; | ||
684 | |||
685 | IRDA_DEBUG(2, "%s(), count=%d, hw_stopped=%d\n", __FUNCTION__ , count, | ||
686 | tty->hw_stopped); | ||
687 | |||
688 | IRDA_ASSERT(self != NULL, return -1;); | ||
689 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | ||
690 | |||
691 | /* We may receive packets from the TTY even before we have finished | ||
692 | * our setup. Not cool. | ||
693 | * The problem is that we don't know the final header and data size | ||
694 | * to create the proper skb, so any skb we would create would have | ||
695 | * bogus header and data size, so need care. | ||
696 | * We use a bogus header size to safely detect this condition. | ||
697 | * Another problem is that hw_stopped was set to 0 way before it | ||
698 | * should be, so we would drop this skb. It should now be fixed. | ||
699 | * One option is to not accept data until we are properly setup. | ||
700 | * But, I suspect that when it happens, the ppp line discipline | ||
701 | * just "drops" the data, which might screw up connect scripts. | ||
702 | * The second option is to create a "safe skb", with large header | ||
703 | * and small size (see ircomm_tty_open() for values). | ||
704 | * We just need to make sure that when the real values get filled, | ||
705 | * we don't mess up the original "safe skb" (see tx_data_size). | ||
706 | * Jean II */ | ||
707 | if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) { | ||
708 | IRDA_DEBUG(1, "%s() : not initialised\n", __FUNCTION__); | ||
709 | #ifdef IRCOMM_NO_TX_BEFORE_INIT | ||
710 | /* We didn't consume anything, TTY will retry */ | ||
711 | return 0; | ||
712 | #endif | ||
713 | } | ||
714 | |||
715 | if (count < 1) | ||
716 | return 0; | ||
717 | |||
718 | /* Protect our manipulation of self->tx_skb and related */ | ||
719 | spin_lock_irqsave(&self->spinlock, flags); | ||
720 | |||
721 | /* Fetch current transmit buffer */ | ||
722 | skb = self->tx_skb; | ||
723 | |||
724 | /* | ||
725 | * Send out all the data we get, possibly as multiple fragmented | ||
726 | * frames, but this will only happen if the data is larger than the | ||
727 | * max data size. The normal case however is just the opposite, and | ||
728 | * this function may be called multiple times, and will then actually | ||
729 | * defragment the data and send it out as one packet as soon as | ||
730 | * possible, but at a safer point in time | ||
731 | */ | ||
732 | while (count) { | ||
733 | size = count; | ||
734 | |||
735 | /* Adjust data size to the max data size */ | ||
736 | if (size > self->max_data_size) | ||
737 | size = self->max_data_size; | ||
738 | |||
739 | /* | ||
740 | * Do we already have a buffer ready for transmit, or do | ||
741 | * we need to allocate a new frame | ||
742 | */ | ||
743 | if (skb) { | ||
744 | /* | ||
745 | * Any room for more data at the end of the current | ||
746 | * transmit buffer? Cannot use skb_tailroom, since | ||
747 | * dev_alloc_skb gives us a larger skb than we | ||
748 | * requested | ||
749 | * Note : use tx_data_size, because max_data_size | ||
750 | * may have changed and we don't want to overwrite | ||
751 | * the skb. - Jean II | ||
752 | */ | ||
753 | if ((tailroom = (self->tx_data_size - skb->len)) > 0) { | ||
754 | /* Adjust data to tailroom */ | ||
755 | if (size > tailroom) | ||
756 | size = tailroom; | ||
757 | } else { | ||
758 | /* | ||
759 | * Current transmit frame is full, so break | ||
760 | * out, so we can send it as soon as possible | ||
761 | */ | ||
762 | break; | ||
763 | } | ||
764 | } else { | ||
765 | /* Prepare a full sized frame */ | ||
766 | skb = dev_alloc_skb(self->max_data_size+ | ||
767 | self->max_header_size); | ||
768 | if (!skb) { | ||
769 | spin_unlock_irqrestore(&self->spinlock, flags); | ||
770 | return -ENOBUFS; | ||
771 | } | ||
772 | skb_reserve(skb, self->max_header_size); | ||
773 | self->tx_skb = skb; | ||
774 | /* Remember skb size because max_data_size may | ||
775 | * change later on - Jean II */ | ||
776 | self->tx_data_size = self->max_data_size; | ||
777 | } | ||
778 | |||
779 | /* Copy data */ | ||
780 | memcpy(skb_put(skb,size), buf + len, size); | ||
781 | |||
782 | count -= size; | ||
783 | len += size; | ||
784 | } | ||
785 | |||
786 | spin_unlock_irqrestore(&self->spinlock, flags); | ||
787 | |||
788 | /* | ||
789 | * Schedule a new thread which will transmit the frame as soon | ||
790 | * as possible, but at a safe point in time. We do this so the | ||
791 | * "user" can give us data multiple times, as PPP does (because of | ||
792 | * its 256 byte tx buffer). We will then defragment and send out | ||
793 | * all this data as one single packet. | ||
794 | */ | ||
795 | schedule_work(&self->tqueue); | ||
796 | |||
797 | return len; | ||
798 | } | ||
799 | |||
800 | /* | ||
801 | * Function ircomm_tty_write_room (tty) | ||
802 | * | ||
803 | * This routine returns the numbers of characters the tty driver will | ||
804 | * accept for queuing to be written. This number is subject to change as | ||
805 | * output buffers get emptied, or if the output flow control is acted. | ||
806 | */ | ||
807 | static int ircomm_tty_write_room(struct tty_struct *tty) | ||
808 | { | ||
809 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | ||
810 | unsigned long flags; | ||
811 | int ret; | ||
812 | |||
813 | IRDA_ASSERT(self != NULL, return -1;); | ||
814 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | ||
815 | |||
816 | #ifdef IRCOMM_NO_TX_BEFORE_INIT | ||
817 | /* max_header_size tells us if the channel is initialised or not. */ | ||
818 | if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) | ||
819 | /* Don't bother us yet */ | ||
820 | return 0; | ||
821 | #endif | ||
822 | |||
823 | /* Check if we are allowed to transmit any data. | ||
824 | * hw_stopped is the regular flow control. | ||
825 | * Jean II */ | ||
826 | if (tty->hw_stopped) | ||
827 | ret = 0; | ||
828 | else { | ||
829 | spin_lock_irqsave(&self->spinlock, flags); | ||
830 | if (self->tx_skb) | ||
831 | ret = self->tx_data_size - self->tx_skb->len; | ||
832 | else | ||
833 | ret = self->max_data_size; | ||
834 | spin_unlock_irqrestore(&self->spinlock, flags); | ||
835 | } | ||
836 | IRDA_DEBUG(2, "%s(), ret=%d\n", __FUNCTION__ , ret); | ||
837 | |||
838 | return ret; | ||
839 | } | ||
840 | |||
841 | /* | ||
842 | * Function ircomm_tty_wait_until_sent (tty, timeout) | ||
843 | * | ||
844 | * This routine waits until the device has written out all of the | ||
845 | * characters in its transmitter FIFO. | ||
846 | */ | ||
847 | static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout) | ||
848 | { | ||
849 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | ||
850 | unsigned long orig_jiffies, poll_time; | ||
851 | unsigned long flags; | ||
852 | |||
853 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); | ||
854 | |||
855 | IRDA_ASSERT(self != NULL, return;); | ||
856 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | ||
857 | |||
858 | orig_jiffies = jiffies; | ||
859 | |||
860 | /* Set poll time to 200 ms */ | ||
861 | poll_time = IRDA_MIN(timeout, msecs_to_jiffies(200)); | ||
862 | |||
863 | spin_lock_irqsave(&self->spinlock, flags); | ||
864 | while (self->tx_skb && self->tx_skb->len) { | ||
865 | spin_unlock_irqrestore(&self->spinlock, flags); | ||
866 | current->state = TASK_INTERRUPTIBLE; | ||
867 | schedule_timeout(poll_time); | ||
868 | spin_lock_irqsave(&self->spinlock, flags); | ||
869 | if (signal_pending(current)) | ||
870 | break; | ||
871 | if (timeout && time_after(jiffies, orig_jiffies + timeout)) | ||
872 | break; | ||
873 | } | ||
874 | spin_unlock_irqrestore(&self->spinlock, flags); | ||
875 | current->state = TASK_RUNNING; | ||
876 | } | ||
877 | |||
878 | /* | ||
879 | * Function ircomm_tty_throttle (tty) | ||
880 | * | ||
881 | * This routine notifies the tty driver that input buffers for the line | ||
882 | * discipline are close to full, and it should somehow signal that no | ||
883 | * more characters should be sent to the tty. | ||
884 | */ | ||
885 | static void ircomm_tty_throttle(struct tty_struct *tty) | ||
886 | { | ||
887 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | ||
888 | |||
889 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); | ||
890 | |||
891 | IRDA_ASSERT(self != NULL, return;); | ||
892 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | ||
893 | |||
894 | /* Software flow control? */ | ||
895 | if (I_IXOFF(tty)) | ||
896 | ircomm_tty_send_xchar(tty, STOP_CHAR(tty)); | ||
897 | |||
898 | /* Hardware flow control? */ | ||
899 | if (tty->termios->c_cflag & CRTSCTS) { | ||
900 | self->settings.dte &= ~IRCOMM_RTS; | ||
901 | self->settings.dte |= IRCOMM_DELTA_RTS; | ||
902 | |||
903 | ircomm_param_request(self, IRCOMM_DTE, TRUE); | ||
904 | } | ||
905 | |||
906 | ircomm_flow_request(self->ircomm, FLOW_STOP); | ||
907 | } | ||
908 | |||
909 | /* | ||
910 | * Function ircomm_tty_unthrottle (tty) | ||
911 | * | ||
912 | * This routine notifies the tty drivers that it should signals that | ||
913 | * characters can now be sent to the tty without fear of overrunning the | ||
914 | * input buffers of the line disciplines. | ||
915 | */ | ||
916 | static void ircomm_tty_unthrottle(struct tty_struct *tty) | ||
917 | { | ||
918 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | ||
919 | |||
920 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); | ||
921 | |||
922 | IRDA_ASSERT(self != NULL, return;); | ||
923 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | ||
924 | |||
925 | /* Using software flow control? */ | ||
926 | if (I_IXOFF(tty)) { | ||
927 | ircomm_tty_send_xchar(tty, START_CHAR(tty)); | ||
928 | } | ||
929 | |||
930 | /* Using hardware flow control? */ | ||
931 | if (tty->termios->c_cflag & CRTSCTS) { | ||
932 | self->settings.dte |= (IRCOMM_RTS|IRCOMM_DELTA_RTS); | ||
933 | |||
934 | ircomm_param_request(self, IRCOMM_DTE, TRUE); | ||
935 | IRDA_DEBUG(1, "%s(), FLOW_START\n", __FUNCTION__ ); | ||
936 | } | ||
937 | ircomm_flow_request(self->ircomm, FLOW_START); | ||
938 | } | ||
939 | |||
940 | /* | ||
941 | * Function ircomm_tty_chars_in_buffer (tty) | ||
942 | * | ||
943 | * Indicates if there are any data in the buffer | ||
944 | * | ||
945 | */ | ||
946 | static int ircomm_tty_chars_in_buffer(struct tty_struct *tty) | ||
947 | { | ||
948 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | ||
949 | unsigned long flags; | ||
950 | int len = 0; | ||
951 | |||
952 | IRDA_ASSERT(self != NULL, return -1;); | ||
953 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | ||
954 | |||
955 | spin_lock_irqsave(&self->spinlock, flags); | ||
956 | |||
957 | if (self->tx_skb) | ||
958 | len = self->tx_skb->len; | ||
959 | |||
960 | spin_unlock_irqrestore(&self->spinlock, flags); | ||
961 | |||
962 | return len; | ||
963 | } | ||
964 | |||
965 | static void ircomm_tty_shutdown(struct ircomm_tty_cb *self) | ||
966 | { | ||
967 | unsigned long flags; | ||
968 | |||
969 | IRDA_ASSERT(self != NULL, return;); | ||
970 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | ||
971 | |||
972 | IRDA_DEBUG(0, "%s()\n", __FUNCTION__ ); | ||
973 | |||
974 | if (!test_and_clear_bit(ASYNC_B_INITIALIZED, &self->flags)) | ||
975 | return; | ||
976 | |||
977 | ircomm_tty_detach_cable(self); | ||
978 | |||
979 | spin_lock_irqsave(&self->spinlock, flags); | ||
980 | |||
981 | del_timer(&self->watchdog_timer); | ||
982 | |||
983 | /* Free parameter buffer */ | ||
984 | if (self->ctrl_skb) { | ||
985 | dev_kfree_skb(self->ctrl_skb); | ||
986 | self->ctrl_skb = NULL; | ||
987 | } | ||
988 | |||
989 | /* Free transmit buffer */ | ||
990 | if (self->tx_skb) { | ||
991 | dev_kfree_skb(self->tx_skb); | ||
992 | self->tx_skb = NULL; | ||
993 | } | ||
994 | |||
995 | if (self->ircomm) { | ||
996 | ircomm_close(self->ircomm); | ||
997 | self->ircomm = NULL; | ||
998 | } | ||
999 | |||
1000 | spin_unlock_irqrestore(&self->spinlock, flags); | ||
1001 | } | ||
1002 | |||
1003 | /* | ||
1004 | * Function ircomm_tty_hangup (tty) | ||
1005 | * | ||
1006 | * This routine notifies the tty driver that it should hangup the tty | ||
1007 | * device. | ||
1008 | * | ||
1009 | */ | ||
1010 | static void ircomm_tty_hangup(struct tty_struct *tty) | ||
1011 | { | ||
1012 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | ||
1013 | unsigned long flags; | ||
1014 | |||
1015 | IRDA_DEBUG(0, "%s()\n", __FUNCTION__ ); | ||
1016 | |||
1017 | IRDA_ASSERT(self != NULL, return;); | ||
1018 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | ||
1019 | |||
1020 | if (!tty) | ||
1021 | return; | ||
1022 | |||
1023 | /* ircomm_tty_flush_buffer(tty); */ | ||
1024 | ircomm_tty_shutdown(self); | ||
1025 | |||
1026 | /* I guess we need to lock here - Jean II */ | ||
1027 | spin_lock_irqsave(&self->spinlock, flags); | ||
1028 | self->flags &= ~ASYNC_NORMAL_ACTIVE; | ||
1029 | self->tty = NULL; | ||
1030 | self->open_count = 0; | ||
1031 | spin_unlock_irqrestore(&self->spinlock, flags); | ||
1032 | |||
1033 | wake_up_interruptible(&self->open_wait); | ||
1034 | } | ||
1035 | |||
1036 | /* | ||
1037 | * Function ircomm_tty_send_xchar (tty, ch) | ||
1038 | * | ||
1039 | * This routine is used to send a high-priority XON/XOFF character to | ||
1040 | * the device. | ||
1041 | */ | ||
1042 | static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch) | ||
1043 | { | ||
1044 | IRDA_DEBUG(0, "%s(), not impl\n", __FUNCTION__ ); | ||
1045 | } | ||
1046 | |||
1047 | /* | ||
1048 | * Function ircomm_tty_start (tty) | ||
1049 | * | ||
1050 | * This routine notifies the tty driver that it resume sending | ||
1051 | * characters to the tty device. | ||
1052 | */ | ||
1053 | void ircomm_tty_start(struct tty_struct *tty) | ||
1054 | { | ||
1055 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | ||
1056 | |||
1057 | ircomm_flow_request(self->ircomm, FLOW_START); | ||
1058 | } | ||
1059 | |||
1060 | /* | ||
1061 | * Function ircomm_tty_stop (tty) | ||
1062 | * | ||
1063 | * This routine notifies the tty driver that it should stop outputting | ||
1064 | * characters to the tty device. | ||
1065 | */ | ||
1066 | static void ircomm_tty_stop(struct tty_struct *tty) | ||
1067 | { | ||
1068 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | ||
1069 | |||
1070 | IRDA_ASSERT(self != NULL, return;); | ||
1071 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | ||
1072 | |||
1073 | ircomm_flow_request(self->ircomm, FLOW_STOP); | ||
1074 | } | ||
1075 | |||
1076 | /* | ||
1077 | * Function ircomm_check_modem_status (self) | ||
1078 | * | ||
1079 | * Check for any changes in the DCE's line settings. This function should | ||
1080 | * be called whenever the dce parameter settings changes, to update the | ||
1081 | * flow control settings and other things | ||
1082 | */ | ||
1083 | void ircomm_tty_check_modem_status(struct ircomm_tty_cb *self) | ||
1084 | { | ||
1085 | struct tty_struct *tty; | ||
1086 | int status; | ||
1087 | |||
1088 | IRDA_DEBUG(0, "%s()\n", __FUNCTION__ ); | ||
1089 | |||
1090 | IRDA_ASSERT(self != NULL, return;); | ||
1091 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | ||
1092 | |||
1093 | tty = self->tty; | ||
1094 | |||
1095 | status = self->settings.dce; | ||
1096 | |||
1097 | if (status & IRCOMM_DCE_DELTA_ANY) { | ||
1098 | /*wake_up_interruptible(&self->delta_msr_wait);*/ | ||
1099 | } | ||
1100 | if ((self->flags & ASYNC_CHECK_CD) && (status & IRCOMM_DELTA_CD)) { | ||
1101 | IRDA_DEBUG(2, | ||
1102 | "%s(), ircomm%d CD now %s...\n", __FUNCTION__ , self->line, | ||
1103 | (status & IRCOMM_CD) ? "on" : "off"); | ||
1104 | |||
1105 | if (status & IRCOMM_CD) { | ||
1106 | wake_up_interruptible(&self->open_wait); | ||
1107 | } else { | ||
1108 | IRDA_DEBUG(2, | ||
1109 | "%s(), Doing serial hangup..\n", __FUNCTION__ ); | ||
1110 | if (tty) | ||
1111 | tty_hangup(tty); | ||
1112 | |||
1113 | /* Hangup will remote the tty, so better break out */ | ||
1114 | return; | ||
1115 | } | ||
1116 | } | ||
1117 | if (self->flags & ASYNC_CTS_FLOW) { | ||
1118 | if (tty->hw_stopped) { | ||
1119 | if (status & IRCOMM_CTS) { | ||
1120 | IRDA_DEBUG(2, | ||
1121 | "%s(), CTS tx start...\n", __FUNCTION__ ); | ||
1122 | tty->hw_stopped = 0; | ||
1123 | |||
1124 | /* Wake up processes blocked on open */ | ||
1125 | wake_up_interruptible(&self->open_wait); | ||
1126 | |||
1127 | schedule_work(&self->tqueue); | ||
1128 | return; | ||
1129 | } | ||
1130 | } else { | ||
1131 | if (!(status & IRCOMM_CTS)) { | ||
1132 | IRDA_DEBUG(2, | ||
1133 | "%s(), CTS tx stop...\n", __FUNCTION__ ); | ||
1134 | tty->hw_stopped = 1; | ||
1135 | } | ||
1136 | } | ||
1137 | } | ||
1138 | } | ||
1139 | |||
1140 | /* | ||
1141 | * Function ircomm_tty_data_indication (instance, sap, skb) | ||
1142 | * | ||
1143 | * Handle incoming data, and deliver it to the line discipline | ||
1144 | * | ||
1145 | */ | ||
1146 | static int ircomm_tty_data_indication(void *instance, void *sap, | ||
1147 | struct sk_buff *skb) | ||
1148 | { | ||
1149 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; | ||
1150 | |||
1151 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); | ||
1152 | |||
1153 | IRDA_ASSERT(self != NULL, return -1;); | ||
1154 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | ||
1155 | IRDA_ASSERT(skb != NULL, return -1;); | ||
1156 | |||
1157 | if (!self->tty) { | ||
1158 | IRDA_DEBUG(0, "%s(), no tty!\n", __FUNCTION__ ); | ||
1159 | return 0; | ||
1160 | } | ||
1161 | |||
1162 | /* | ||
1163 | * If we receive data when hardware is stopped then something is wrong. | ||
1164 | * We try to poll the peers line settings to check if we are up todate. | ||
1165 | * Devices like WinCE can do this, and since they don't send any | ||
1166 | * params, we can just as well declare the hardware for running. | ||
1167 | */ | ||
1168 | if (self->tty->hw_stopped && (self->flow == FLOW_START)) { | ||
1169 | IRDA_DEBUG(0, "%s(), polling for line settings!\n", __FUNCTION__ ); | ||
1170 | ircomm_param_request(self, IRCOMM_POLL, TRUE); | ||
1171 | |||
1172 | /* We can just as well declare the hardware for running */ | ||
1173 | ircomm_tty_send_initial_parameters(self); | ||
1174 | ircomm_tty_link_established(self); | ||
1175 | } | ||
1176 | |||
1177 | /* | ||
1178 | * Just give it over to the line discipline. There is no need to | ||
1179 | * involve the flip buffers, since we are not running in an interrupt | ||
1180 | * handler | ||
1181 | */ | ||
1182 | self->tty->ldisc.receive_buf(self->tty, skb->data, NULL, skb->len); | ||
1183 | |||
1184 | /* No need to kfree_skb - see ircomm_ttp_data_indication() */ | ||
1185 | |||
1186 | return 0; | ||
1187 | } | ||
1188 | |||
1189 | /* | ||
1190 | * Function ircomm_tty_control_indication (instance, sap, skb) | ||
1191 | * | ||
1192 | * Parse all incoming parameters (easy!) | ||
1193 | * | ||
1194 | */ | ||
1195 | static int ircomm_tty_control_indication(void *instance, void *sap, | ||
1196 | struct sk_buff *skb) | ||
1197 | { | ||
1198 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; | ||
1199 | int clen; | ||
1200 | |||
1201 | IRDA_DEBUG(4, "%s()\n", __FUNCTION__ ); | ||
1202 | |||
1203 | IRDA_ASSERT(self != NULL, return -1;); | ||
1204 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | ||
1205 | IRDA_ASSERT(skb != NULL, return -1;); | ||
1206 | |||
1207 | clen = skb->data[0]; | ||
1208 | |||
1209 | irda_param_extract_all(self, skb->data+1, IRDA_MIN(skb->len-1, clen), | ||
1210 | &ircomm_param_info); | ||
1211 | |||
1212 | /* No need to kfree_skb - see ircomm_control_indication() */ | ||
1213 | |||
1214 | return 0; | ||
1215 | } | ||
1216 | |||
1217 | /* | ||
1218 | * Function ircomm_tty_flow_indication (instance, sap, cmd) | ||
1219 | * | ||
1220 | * This function is called by IrTTP when it wants us to slow down the | ||
1221 | * transmission of data. We just mark the hardware as stopped, and wait | ||
1222 | * for IrTTP to notify us that things are OK again. | ||
1223 | */ | ||
1224 | static void ircomm_tty_flow_indication(void *instance, void *sap, | ||
1225 | LOCAL_FLOW cmd) | ||
1226 | { | ||
1227 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; | ||
1228 | struct tty_struct *tty; | ||
1229 | |||
1230 | IRDA_ASSERT(self != NULL, return;); | ||
1231 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | ||
1232 | |||
1233 | tty = self->tty; | ||
1234 | |||
1235 | switch (cmd) { | ||
1236 | case FLOW_START: | ||
1237 | IRDA_DEBUG(2, "%s(), hw start!\n", __FUNCTION__ ); | ||
1238 | tty->hw_stopped = 0; | ||
1239 | |||
1240 | /* ircomm_tty_do_softint will take care of the rest */ | ||
1241 | schedule_work(&self->tqueue); | ||
1242 | break; | ||
1243 | default: /* If we get here, something is very wrong, better stop */ | ||
1244 | case FLOW_STOP: | ||
1245 | IRDA_DEBUG(2, "%s(), hw stopped!\n", __FUNCTION__ ); | ||
1246 | tty->hw_stopped = 1; | ||
1247 | break; | ||
1248 | } | ||
1249 | self->flow = cmd; | ||
1250 | } | ||
1251 | |||
1252 | static int ircomm_tty_line_info(struct ircomm_tty_cb *self, char *buf) | ||
1253 | { | ||
1254 | int ret=0; | ||
1255 | |||
1256 | ret += sprintf(buf+ret, "State: %s\n", ircomm_tty_state[self->state]); | ||
1257 | |||
1258 | ret += sprintf(buf+ret, "Service type: "); | ||
1259 | if (self->service_type & IRCOMM_9_WIRE) | ||
1260 | ret += sprintf(buf+ret, "9_WIRE"); | ||
1261 | else if (self->service_type & IRCOMM_3_WIRE) | ||
1262 | ret += sprintf(buf+ret, "3_WIRE"); | ||
1263 | else if (self->service_type & IRCOMM_3_WIRE_RAW) | ||
1264 | ret += sprintf(buf+ret, "3_WIRE_RAW"); | ||
1265 | else | ||
1266 | ret += sprintf(buf+ret, "No common service type!\n"); | ||
1267 | ret += sprintf(buf+ret, "\n"); | ||
1268 | |||
1269 | ret += sprintf(buf+ret, "Port name: %s\n", self->settings.port_name); | ||
1270 | |||
1271 | ret += sprintf(buf+ret, "DTE status: "); | ||
1272 | if (self->settings.dte & IRCOMM_RTS) | ||
1273 | ret += sprintf(buf+ret, "RTS|"); | ||
1274 | if (self->settings.dte & IRCOMM_DTR) | ||
1275 | ret += sprintf(buf+ret, "DTR|"); | ||
1276 | if (self->settings.dte) | ||
1277 | ret--; /* remove the last | */ | ||
1278 | ret += sprintf(buf+ret, "\n"); | ||
1279 | |||
1280 | ret += sprintf(buf+ret, "DCE status: "); | ||
1281 | if (self->settings.dce & IRCOMM_CTS) | ||
1282 | ret += sprintf(buf+ret, "CTS|"); | ||
1283 | if (self->settings.dce & IRCOMM_DSR) | ||
1284 | ret += sprintf(buf+ret, "DSR|"); | ||
1285 | if (self->settings.dce & IRCOMM_CD) | ||
1286 | ret += sprintf(buf+ret, "CD|"); | ||
1287 | if (self->settings.dce & IRCOMM_RI) | ||
1288 | ret += sprintf(buf+ret, "RI|"); | ||
1289 | if (self->settings.dce) | ||
1290 | ret--; /* remove the last | */ | ||
1291 | ret += sprintf(buf+ret, "\n"); | ||
1292 | |||
1293 | ret += sprintf(buf+ret, "Configuration: "); | ||
1294 | if (!self->settings.null_modem) | ||
1295 | ret += sprintf(buf+ret, "DTE <-> DCE\n"); | ||
1296 | else | ||
1297 | ret += sprintf(buf+ret, | ||
1298 | "DTE <-> DTE (null modem emulation)\n"); | ||
1299 | |||
1300 | ret += sprintf(buf+ret, "Data rate: %d\n", self->settings.data_rate); | ||
1301 | |||
1302 | ret += sprintf(buf+ret, "Flow control: "); | ||
1303 | if (self->settings.flow_control & IRCOMM_XON_XOFF_IN) | ||
1304 | ret += sprintf(buf+ret, "XON_XOFF_IN|"); | ||
1305 | if (self->settings.flow_control & IRCOMM_XON_XOFF_OUT) | ||
1306 | ret += sprintf(buf+ret, "XON_XOFF_OUT|"); | ||
1307 | if (self->settings.flow_control & IRCOMM_RTS_CTS_IN) | ||
1308 | ret += sprintf(buf+ret, "RTS_CTS_IN|"); | ||
1309 | if (self->settings.flow_control & IRCOMM_RTS_CTS_OUT) | ||
1310 | ret += sprintf(buf+ret, "RTS_CTS_OUT|"); | ||
1311 | if (self->settings.flow_control & IRCOMM_DSR_DTR_IN) | ||
1312 | ret += sprintf(buf+ret, "DSR_DTR_IN|"); | ||
1313 | if (self->settings.flow_control & IRCOMM_DSR_DTR_OUT) | ||
1314 | ret += sprintf(buf+ret, "DSR_DTR_OUT|"); | ||
1315 | if (self->settings.flow_control & IRCOMM_ENQ_ACK_IN) | ||
1316 | ret += sprintf(buf+ret, "ENQ_ACK_IN|"); | ||
1317 | if (self->settings.flow_control & IRCOMM_ENQ_ACK_OUT) | ||
1318 | ret += sprintf(buf+ret, "ENQ_ACK_OUT|"); | ||
1319 | if (self->settings.flow_control) | ||
1320 | ret--; /* remove the last | */ | ||
1321 | ret += sprintf(buf+ret, "\n"); | ||
1322 | |||
1323 | ret += sprintf(buf+ret, "Flags: "); | ||
1324 | if (self->flags & ASYNC_CTS_FLOW) | ||
1325 | ret += sprintf(buf+ret, "ASYNC_CTS_FLOW|"); | ||
1326 | if (self->flags & ASYNC_CHECK_CD) | ||
1327 | ret += sprintf(buf+ret, "ASYNC_CHECK_CD|"); | ||
1328 | if (self->flags & ASYNC_INITIALIZED) | ||
1329 | ret += sprintf(buf+ret, "ASYNC_INITIALIZED|"); | ||
1330 | if (self->flags & ASYNC_LOW_LATENCY) | ||
1331 | ret += sprintf(buf+ret, "ASYNC_LOW_LATENCY|"); | ||
1332 | if (self->flags & ASYNC_CLOSING) | ||
1333 | ret += sprintf(buf+ret, "ASYNC_CLOSING|"); | ||
1334 | if (self->flags & ASYNC_NORMAL_ACTIVE) | ||
1335 | ret += sprintf(buf+ret, "ASYNC_NORMAL_ACTIVE|"); | ||
1336 | if (self->flags) | ||
1337 | ret--; /* remove the last | */ | ||
1338 | ret += sprintf(buf+ret, "\n"); | ||
1339 | |||
1340 | ret += sprintf(buf+ret, "Role: %s\n", self->client ? | ||
1341 | "client" : "server"); | ||
1342 | ret += sprintf(buf+ret, "Open count: %d\n", self->open_count); | ||
1343 | ret += sprintf(buf+ret, "Max data size: %d\n", self->max_data_size); | ||
1344 | ret += sprintf(buf+ret, "Max header size: %d\n", self->max_header_size); | ||
1345 | |||
1346 | if (self->tty) | ||
1347 | ret += sprintf(buf+ret, "Hardware: %s\n", | ||
1348 | self->tty->hw_stopped ? "Stopped" : "Running"); | ||
1349 | |||
1350 | ret += sprintf(buf+ret, "\n"); | ||
1351 | return ret; | ||
1352 | } | ||
1353 | |||
1354 | |||
1355 | /* | ||
1356 | * Function ircomm_tty_read_proc (buf, start, offset, len, eof, unused) | ||
1357 | * | ||
1358 | * | ||
1359 | * | ||
1360 | */ | ||
1361 | #ifdef CONFIG_PROC_FS | ||
1362 | static int ircomm_tty_read_proc(char *buf, char **start, off_t offset, int len, | ||
1363 | int *eof, void *unused) | ||
1364 | { | ||
1365 | struct ircomm_tty_cb *self; | ||
1366 | int count = 0, l; | ||
1367 | off_t begin = 0; | ||
1368 | unsigned long flags; | ||
1369 | |||
1370 | spin_lock_irqsave(&ircomm_tty->hb_spinlock, flags); | ||
1371 | |||
1372 | self = (struct ircomm_tty_cb *) hashbin_get_first(ircomm_tty); | ||
1373 | while ((self != NULL) && (count < 4000)) { | ||
1374 | if (self->magic != IRCOMM_TTY_MAGIC) | ||
1375 | break; | ||
1376 | |||
1377 | l = ircomm_tty_line_info(self, buf + count); | ||
1378 | count += l; | ||
1379 | if (count+begin > offset+len) | ||
1380 | goto done; | ||
1381 | if (count+begin < offset) { | ||
1382 | begin += count; | ||
1383 | count = 0; | ||
1384 | } | ||
1385 | |||
1386 | self = (struct ircomm_tty_cb *) hashbin_get_next(ircomm_tty); | ||
1387 | } | ||
1388 | *eof = 1; | ||
1389 | done: | ||
1390 | spin_unlock_irqrestore(&ircomm_tty->hb_spinlock, flags); | ||
1391 | |||
1392 | if (offset >= count+begin) | ||
1393 | return 0; | ||
1394 | *start = buf + (offset-begin); | ||
1395 | return ((len < begin+count-offset) ? len : begin+count-offset); | ||
1396 | } | ||
1397 | #endif /* CONFIG_PROC_FS */ | ||
1398 | |||
1399 | MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>"); | ||
1400 | MODULE_DESCRIPTION("IrCOMM serial TTY driver"); | ||
1401 | MODULE_LICENSE("GPL"); | ||
1402 | MODULE_ALIAS_CHARDEV_MAJOR(IRCOMM_TTY_MAJOR); | ||
1403 | |||
1404 | module_init(ircomm_tty_init); | ||
1405 | module_exit(ircomm_tty_cleanup); | ||