Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /********************************************************************* |
6819bc2e | 2 | * |
1da177e4 LT |
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 | |
6819bc2e | 12 | * |
1da177e4 LT |
13 | * Copyright (c) 1999-2000 Dag Brattli, All Rights Reserved. |
14 | * Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com> | |
6819bc2e YH |
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 | |
1da177e4 | 19 | * the License, or (at your option) any later version. |
6819bc2e | 20 | * |
1da177e4 LT |
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. | |
6819bc2e YH |
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, | |
1da177e4 | 29 | * MA 02111-1307 USA |
6819bc2e | 30 | * |
1da177e4 LT |
31 | ********************************************************************/ |
32 | ||
1da177e4 LT |
33 | #include <linux/init.h> |
34 | #include <linux/module.h> | |
35 | #include <linux/fs.h> | |
36 | #include <linux/sched.h> | |
3d304176 | 37 | #include <linux/seq_file.h> |
1da177e4 LT |
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); | |
c4028958 | 65 | static void ircomm_tty_do_softint(struct work_struct *work); |
1da177e4 LT |
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); | |
6819bc2e | 73 | static void ircomm_tty_flow_indication(void *instance, void *sap, |
1da177e4 LT |
74 | LOCAL_FLOW cmd); |
75 | #ifdef CONFIG_PROC_FS | |
3d304176 | 76 | static const struct file_operations ircomm_tty_proc_fops; |
1da177e4 LT |
77 | #endif /* CONFIG_PROC_FS */ |
78 | static struct tty_driver *driver; | |
79 | ||
d76081f8 | 80 | static hashbin_t *ircomm_tty = NULL; |
1da177e4 | 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 | |
3d304176 | 101 | .proc_fops = &ircomm_tty_proc_fops, |
1da177e4 LT |
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; | |
6819bc2e | 116 | ircomm_tty = hashbin_new(HB_LOCK); |
1da177e4 | 117 | if (ircomm_tty == NULL) { |
0dc47877 | 118 | IRDA_ERROR("%s(), can't allocate hashbin!\n", __func__); |
1da177e4 LT |
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", | |
0dc47877 | 136 | __func__); |
1da177e4 LT |
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 | { | |
0dc47877 | 145 | IRDA_DEBUG(0, "%s()\n", __func__ ); |
1da177e4 LT |
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 | ||
0dc47877 | 166 | IRDA_DEBUG(4, "%s()\n", __func__ ); |
1da177e4 LT |
167 | |
168 | ret = tty_unregister_driver(driver); | |
6819bc2e YH |
169 | if (ret) { |
170 | IRDA_ERROR("%s(), failed to unregister driver\n", | |
0dc47877 | 171 | __func__); |
1da177e4 LT |
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 | * | |
6819bc2e | 182 | * |
1da177e4 LT |
183 | * |
184 | */ | |
185 | static int ircomm_tty_startup(struct ircomm_tty_cb *self) | |
186 | { | |
187 | notify_t notify; | |
188 | int ret = -ENODEV; | |
189 | ||
0dc47877 | 190 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 LT |
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)) { | |
0dc47877 | 197 | IRDA_DEBUG(2, "%s(), already open so break out!\n", __func__ ); |
1da177e4 LT |
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; | |
6819bc2e | 206 | notify.flow_indication = ircomm_tty_flow_indication; |
1da177e4 LT |
207 | |
208 | /* Use the ircomm_tty interface for these ones */ | |
6819bc2e | 209 | notify.disconnect_indication = ircomm_tty_disconnect_indication; |
1da177e4 | 210 | notify.connect_confirm = ircomm_tty_connect_confirm; |
6819bc2e | 211 | notify.connect_indication = ircomm_tty_connect_indication; |
1da177e4 LT |
212 | strlcpy(notify.name, "ircomm_tty", sizeof(notify.name)); |
213 | notify.instance = self; | |
214 | ||
215 | if (!self->ircomm) { | |
6819bc2e | 216 | self->ircomm = ircomm_open(¬ify, self->service_type, |
1da177e4 LT |
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) { | |
0dc47877 | 227 | IRDA_ERROR("%s(), error attaching cable!\n", __func__); |
1da177e4 LT |
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 | * | |
6819bc2e | 240 | * |
1da177e4 LT |
241 | * |
242 | */ | |
6819bc2e | 243 | static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self, |
1da177e4 LT |
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; | |
6819bc2e | 251 | |
0dc47877 | 252 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 LT |
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. | |
6819bc2e | 259 | */ |
1da177e4 LT |
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; | |
0dc47877 | 263 | IRDA_DEBUG(1, "%s(), O_NONBLOCK requested!\n", __func__ ); |
1da177e4 LT |
264 | return 0; |
265 | } | |
266 | ||
267 | if (tty->termios->c_cflag & CLOCAL) { | |
0dc47877 | 268 | IRDA_DEBUG(1, "%s(), doing CLOCAL!\n", __func__ ); |
1da177e4 LT |
269 | do_clocal = 1; |
270 | } | |
6819bc2e | 271 | |
1da177e4 LT |
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 | */ | |
6819bc2e | 278 | |
1da177e4 LT |
279 | retval = 0; |
280 | add_wait_queue(&self->open_wait, &wait); | |
6819bc2e | 281 | |
1da177e4 LT |
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++; | |
6819bc2e | 293 | |
1da177e4 LT |
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; | |
6819bc2e | 301 | |
1da177e4 LT |
302 | ircomm_param_request(self, IRCOMM_DTE, TRUE); |
303 | } | |
6819bc2e | 304 | |
1da177e4 | 305 | current->state = TASK_INTERRUPTIBLE; |
6819bc2e | 306 | |
1da177e4 LT |
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 | } | |
6819bc2e YH |
313 | |
314 | /* | |
1da177e4 LT |
315 | * Check if link is ready now. Even if CLOCAL is |
316 | * specified, we cannot return before the IrCOMM link is | |
6819bc2e | 317 | * ready |
1da177e4 | 318 | */ |
6819bc2e YH |
319 | if (!test_bit(ASYNC_B_CLOSING, &self->flags) && |
320 | (do_clocal || (self->settings.dce & IRCOMM_CD)) && | |
1da177e4 LT |
321 | self->state == IRCOMM_TTY_READY) |
322 | { | |
6819bc2e | 323 | break; |
1da177e4 | 324 | } |
6819bc2e | 325 | |
1da177e4 LT |
326 | if (signal_pending(current)) { |
327 | retval = -ERESTARTSYS; | |
328 | break; | |
329 | } | |
6819bc2e | 330 | |
1da177e4 LT |
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 ); | |
6819bc2e | 333 | |
1da177e4 LT |
334 | schedule(); |
335 | } | |
6819bc2e | 336 | |
1da177e4 LT |
337 | __set_current_state(TASK_RUNNING); |
338 | remove_wait_queue(&self->open_wait, &wait); | |
6819bc2e | 339 | |
1da177e4 LT |
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--; | |
6819bc2e | 347 | |
1da177e4 LT |
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); | |
6819bc2e | 350 | |
1da177e4 LT |
351 | if (!retval) |
352 | self->flags |= ASYNC_NORMAL_ACTIVE; | |
6819bc2e YH |
353 | |
354 | return retval; | |
1da177e4 LT |
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 | ||
0dc47877 | 371 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 LT |
372 | |
373 | line = tty->index; | |
ad36b88e | 374 | if (line >= IRCOMM_TTY_PORTS) |
1da177e4 | 375 | return -ENODEV; |
1da177e4 LT |
376 | |
377 | /* Check if instance already exists */ | |
378 | self = hashbin_lock_find(ircomm_tty, line, NULL); | |
379 | if (!self) { | |
380 | /* No, so make new instance */ | |
0da974f4 | 381 | self = kzalloc(sizeof(struct ircomm_tty_cb), GFP_KERNEL); |
1da177e4 | 382 | if (self == NULL) { |
0dc47877 | 383 | IRDA_ERROR("%s(), kmalloc failed!\n", __func__); |
1da177e4 LT |
384 | return -ENOMEM; |
385 | } | |
6819bc2e | 386 | |
1da177e4 LT |
387 | self->magic = IRCOMM_TTY_MAGIC; |
388 | self->flow = FLOW_STOP; | |
389 | ||
390 | self->line = line; | |
c4028958 | 391 | INIT_WORK(&self->tqueue, ircomm_tty_do_softint); |
1da177e4 LT |
392 | self->max_header_size = IRCOMM_TTY_HDR_UNINITIALISED; |
393 | self->max_data_size = IRCOMM_TTY_DATA_UNINITIALISED; | |
394 | self->close_delay = 5*HZ/10; | |
395 | self->closing_wait = 30*HZ; | |
396 | ||
397 | /* Init some important stuff */ | |
398 | init_timer(&self->watchdog_timer); | |
399 | init_waitqueue_head(&self->open_wait); | |
6819bc2e | 400 | init_waitqueue_head(&self->close_wait); |
1da177e4 LT |
401 | spin_lock_init(&self->spinlock); |
402 | ||
6819bc2e | 403 | /* |
1da177e4 LT |
404 | * Force TTY into raw mode by default which is usually what |
405 | * we want for IrCOMM and IrLPT. This way applications will | |
6819bc2e | 406 | * not have to twiddle with printcap etc. |
ad36b88e AC |
407 | * |
408 | * Note this is completely usafe and doesn't work properly | |
1da177e4 LT |
409 | */ |
410 | tty->termios->c_iflag = 0; | |
411 | tty->termios->c_oflag = 0; | |
412 | ||
413 | /* Insert into hash */ | |
414 | hashbin_insert(ircomm_tty, (irda_queue_t *) self, line, NULL); | |
415 | } | |
416 | /* ++ is not atomic, so this should be protected - Jean II */ | |
417 | spin_lock_irqsave(&self->spinlock, flags); | |
418 | self->open_count++; | |
419 | ||
420 | tty->driver_data = self; | |
421 | self->tty = tty; | |
422 | spin_unlock_irqrestore(&self->spinlock, flags); | |
423 | ||
0dc47877 | 424 | IRDA_DEBUG(1, "%s(), %s%d, count = %d\n", __func__ , tty->driver->name, |
1da177e4 LT |
425 | self->line, self->open_count); |
426 | ||
427 | /* Not really used by us, but lets do it anyway */ | |
428 | self->tty->low_latency = (self->flags & ASYNC_LOW_LATENCY) ? 1 : 0; | |
429 | ||
430 | /* | |
431 | * If the port is the middle of closing, bail out now | |
432 | */ | |
433 | if (tty_hung_up_p(filp) || | |
434 | test_bit(ASYNC_B_CLOSING, &self->flags)) { | |
435 | ||
436 | /* Hm, why are we blocking on ASYNC_CLOSING if we | |
437 | * do return -EAGAIN/-ERESTARTSYS below anyway? | |
438 | * IMHO it's either not needed in the first place | |
439 | * or for some reason we need to make sure the async | |
440 | * closing has been finished - if so, wouldn't we | |
441 | * probably better sleep uninterruptible? | |
442 | */ | |
443 | ||
444 | if (wait_event_interruptible(self->close_wait, !test_bit(ASYNC_B_CLOSING, &self->flags))) { | |
445 | IRDA_WARNING("%s - got signal while blocking on ASYNC_CLOSING!\n", | |
0dc47877 | 446 | __func__); |
1da177e4 LT |
447 | return -ERESTARTSYS; |
448 | } | |
449 | ||
450 | #ifdef SERIAL_DO_RESTART | |
451 | return ((self->flags & ASYNC_HUP_NOTIFY) ? | |
452 | -EAGAIN : -ERESTARTSYS); | |
453 | #else | |
454 | return -EAGAIN; | |
455 | #endif | |
456 | } | |
457 | ||
458 | /* Check if this is a "normal" ircomm device, or an irlpt device */ | |
459 | if (line < 0x10) { | |
460 | self->service_type = IRCOMM_3_WIRE | IRCOMM_9_WIRE; | |
461 | self->settings.service_type = IRCOMM_9_WIRE; /* 9 wire as default */ | |
462 | /* Jan Kiszka -> add DSR/RI -> Conform to IrCOMM spec */ | |
463 | self->settings.dce = IRCOMM_CTS | IRCOMM_CD | IRCOMM_DSR | IRCOMM_RI; /* Default line settings */ | |
0dc47877 | 464 | IRDA_DEBUG(2, "%s(), IrCOMM device\n", __func__ ); |
1da177e4 | 465 | } else { |
0dc47877 | 466 | IRDA_DEBUG(2, "%s(), IrLPT device\n", __func__ ); |
1da177e4 LT |
467 | self->service_type = IRCOMM_3_WIRE_RAW; |
468 | self->settings.service_type = IRCOMM_3_WIRE_RAW; /* Default */ | |
469 | } | |
470 | ||
471 | ret = ircomm_tty_startup(self); | |
472 | if (ret) | |
473 | return ret; | |
474 | ||
475 | ret = ircomm_tty_block_til_ready(self, filp); | |
476 | if (ret) { | |
6819bc2e | 477 | IRDA_DEBUG(2, |
0dc47877 | 478 | "%s(), returning after block_til_ready with %d\n", __func__ , |
1da177e4 LT |
479 | ret); |
480 | ||
481 | return ret; | |
482 | } | |
483 | return 0; | |
484 | } | |
485 | ||
486 | /* | |
487 | * Function ircomm_tty_close (tty, filp) | |
488 | * | |
489 | * This routine is called when a particular tty device is closed. | |
490 | * | |
491 | */ | |
492 | static void ircomm_tty_close(struct tty_struct *tty, struct file *filp) | |
493 | { | |
494 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
495 | unsigned long flags; | |
496 | ||
0dc47877 | 497 | IRDA_DEBUG(0, "%s()\n", __func__ ); |
1da177e4 LT |
498 | |
499 | if (!tty) | |
500 | return; | |
501 | ||
502 | IRDA_ASSERT(self != NULL, return;); | |
503 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
504 | ||
505 | spin_lock_irqsave(&self->spinlock, flags); | |
506 | ||
507 | if (tty_hung_up_p(filp)) { | |
508 | spin_unlock_irqrestore(&self->spinlock, flags); | |
509 | ||
0dc47877 | 510 | IRDA_DEBUG(0, "%s(), returning 1\n", __func__ ); |
1da177e4 LT |
511 | return; |
512 | } | |
513 | ||
514 | if ((tty->count == 1) && (self->open_count != 1)) { | |
515 | /* | |
516 | * Uh, oh. tty->count is 1, which means that the tty | |
517 | * structure will be freed. state->count should always | |
518 | * be one in these conditions. If it's greater than | |
519 | * one, we've got real problems, since it means the | |
520 | * serial port won't be shutdown. | |
521 | */ | |
522 | IRDA_DEBUG(0, "%s(), bad serial port count; " | |
0dc47877 | 523 | "tty->count is 1, state->count is %d\n", __func__ , |
1da177e4 LT |
524 | self->open_count); |
525 | self->open_count = 1; | |
526 | } | |
527 | ||
528 | if (--self->open_count < 0) { | |
529 | IRDA_ERROR("%s(), bad serial port count for ttys%d: %d\n", | |
0dc47877 | 530 | __func__, self->line, self->open_count); |
1da177e4 LT |
531 | self->open_count = 0; |
532 | } | |
533 | if (self->open_count) { | |
534 | spin_unlock_irqrestore(&self->spinlock, flags); | |
535 | ||
0dc47877 | 536 | IRDA_DEBUG(0, "%s(), open count > 0\n", __func__ ); |
1da177e4 LT |
537 | return; |
538 | } | |
539 | ||
540 | /* Hum... Should be test_and_set_bit ??? - Jean II */ | |
541 | set_bit(ASYNC_B_CLOSING, &self->flags); | |
542 | ||
543 | /* We need to unlock here (we were unlocking at the end of this | |
544 | * function), because tty_wait_until_sent() may schedule. | |
545 | * I don't know if the rest should be protected somehow, | |
546 | * so someone should check. - Jean II */ | |
547 | spin_unlock_irqrestore(&self->spinlock, flags); | |
548 | ||
549 | /* | |
6819bc2e | 550 | * Now we wait for the transmit buffer to clear; and we notify |
1da177e4 LT |
551 | * the line discipline to only process XON/XOFF characters. |
552 | */ | |
553 | tty->closing = 1; | |
554 | if (self->closing_wait != ASYNC_CLOSING_WAIT_NONE) | |
555 | tty_wait_until_sent(tty, self->closing_wait); | |
556 | ||
557 | ircomm_tty_shutdown(self); | |
558 | ||
f34d7a5b AC |
559 | tty_driver_flush_buffer(tty); |
560 | tty_ldisc_flush(tty); | |
1da177e4 LT |
561 | |
562 | tty->closing = 0; | |
563 | self->tty = NULL; | |
564 | ||
565 | if (self->blocked_open) { | |
121caf57 NA |
566 | if (self->close_delay) |
567 | schedule_timeout_interruptible(self->close_delay); | |
1da177e4 LT |
568 | wake_up_interruptible(&self->open_wait); |
569 | } | |
570 | ||
571 | self->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING); | |
572 | wake_up_interruptible(&self->close_wait); | |
573 | } | |
574 | ||
575 | /* | |
576 | * Function ircomm_tty_flush_buffer (tty) | |
577 | * | |
6819bc2e | 578 | * |
1da177e4 LT |
579 | * |
580 | */ | |
581 | static void ircomm_tty_flush_buffer(struct tty_struct *tty) | |
582 | { | |
583 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
584 | ||
585 | IRDA_ASSERT(self != NULL, return;); | |
586 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
587 | ||
6819bc2e YH |
588 | /* |
589 | * Let do_softint() do this to avoid race condition with | |
590 | * do_softint() ;-) | |
1da177e4 LT |
591 | */ |
592 | schedule_work(&self->tqueue); | |
593 | } | |
594 | ||
595 | /* | |
c4028958 | 596 | * Function ircomm_tty_do_softint (work) |
1da177e4 LT |
597 | * |
598 | * We use this routine to give the write wakeup to the user at at a | |
6819bc2e | 599 | * safe time (as fast as possible after write have completed). This |
1da177e4 LT |
600 | * can be compared to the Tx interrupt. |
601 | */ | |
c4028958 | 602 | static void ircomm_tty_do_softint(struct work_struct *work) |
1da177e4 | 603 | { |
c4028958 DH |
604 | struct ircomm_tty_cb *self = |
605 | container_of(work, struct ircomm_tty_cb, tqueue); | |
1da177e4 LT |
606 | struct tty_struct *tty; |
607 | unsigned long flags; | |
608 | struct sk_buff *skb, *ctrl_skb; | |
609 | ||
0dc47877 | 610 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 LT |
611 | |
612 | if (!self || self->magic != IRCOMM_TTY_MAGIC) | |
613 | return; | |
614 | ||
615 | tty = self->tty; | |
616 | if (!tty) | |
617 | return; | |
618 | ||
619 | /* Unlink control buffer */ | |
620 | spin_lock_irqsave(&self->spinlock, flags); | |
621 | ||
622 | ctrl_skb = self->ctrl_skb; | |
623 | self->ctrl_skb = NULL; | |
624 | ||
625 | spin_unlock_irqrestore(&self->spinlock, flags); | |
626 | ||
627 | /* Flush control buffer if any */ | |
628 | if(ctrl_skb) { | |
629 | if(self->flow == FLOW_START) | |
630 | ircomm_control_request(self->ircomm, ctrl_skb); | |
631 | /* Drop reference count - see ircomm_ttp_data_request(). */ | |
632 | dev_kfree_skb(ctrl_skb); | |
633 | } | |
634 | ||
635 | if (tty->hw_stopped) | |
636 | return; | |
637 | ||
638 | /* Unlink transmit buffer */ | |
639 | spin_lock_irqsave(&self->spinlock, flags); | |
6819bc2e | 640 | |
1da177e4 LT |
641 | skb = self->tx_skb; |
642 | self->tx_skb = NULL; | |
643 | ||
644 | spin_unlock_irqrestore(&self->spinlock, flags); | |
645 | ||
646 | /* Flush transmit buffer if any */ | |
647 | if (skb) { | |
648 | ircomm_tty_do_event(self, IRCOMM_TTY_DATA_REQUEST, skb, NULL); | |
649 | /* Drop reference count - see ircomm_ttp_data_request(). */ | |
650 | dev_kfree_skb(skb); | |
651 | } | |
6819bc2e | 652 | |
1da177e4 | 653 | /* Check if user (still) wants to be waken up */ |
a352def2 | 654 | tty_wakeup(tty); |
1da177e4 LT |
655 | } |
656 | ||
657 | /* | |
658 | * Function ircomm_tty_write (tty, buf, count) | |
659 | * | |
660 | * This routine is called by the kernel to write a series of characters | |
661 | * to the tty device. The characters may come from user space or kernel | |
662 | * space. This routine will return the number of characters actually | |
663 | * accepted for writing. This routine is mandatory. | |
664 | */ | |
665 | static int ircomm_tty_write(struct tty_struct *tty, | |
666 | const unsigned char *buf, int count) | |
667 | { | |
668 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
669 | unsigned long flags; | |
670 | struct sk_buff *skb; | |
671 | int tailroom = 0; | |
672 | int len = 0; | |
673 | int size; | |
674 | ||
0dc47877 | 675 | IRDA_DEBUG(2, "%s(), count=%d, hw_stopped=%d\n", __func__ , count, |
1da177e4 LT |
676 | tty->hw_stopped); |
677 | ||
678 | IRDA_ASSERT(self != NULL, return -1;); | |
679 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
680 | ||
681 | /* We may receive packets from the TTY even before we have finished | |
682 | * our setup. Not cool. | |
683 | * The problem is that we don't know the final header and data size | |
684 | * to create the proper skb, so any skb we would create would have | |
685 | * bogus header and data size, so need care. | |
686 | * We use a bogus header size to safely detect this condition. | |
687 | * Another problem is that hw_stopped was set to 0 way before it | |
688 | * should be, so we would drop this skb. It should now be fixed. | |
689 | * One option is to not accept data until we are properly setup. | |
690 | * But, I suspect that when it happens, the ppp line discipline | |
691 | * just "drops" the data, which might screw up connect scripts. | |
692 | * The second option is to create a "safe skb", with large header | |
693 | * and small size (see ircomm_tty_open() for values). | |
694 | * We just need to make sure that when the real values get filled, | |
695 | * we don't mess up the original "safe skb" (see tx_data_size). | |
696 | * Jean II */ | |
697 | if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) { | |
0dc47877 | 698 | IRDA_DEBUG(1, "%s() : not initialised\n", __func__); |
1da177e4 LT |
699 | #ifdef IRCOMM_NO_TX_BEFORE_INIT |
700 | /* We didn't consume anything, TTY will retry */ | |
701 | return 0; | |
702 | #endif | |
703 | } | |
704 | ||
705 | if (count < 1) | |
706 | return 0; | |
707 | ||
708 | /* Protect our manipulation of self->tx_skb and related */ | |
709 | spin_lock_irqsave(&self->spinlock, flags); | |
710 | ||
711 | /* Fetch current transmit buffer */ | |
712 | skb = self->tx_skb; | |
713 | ||
6819bc2e | 714 | /* |
1da177e4 LT |
715 | * Send out all the data we get, possibly as multiple fragmented |
716 | * frames, but this will only happen if the data is larger than the | |
717 | * max data size. The normal case however is just the opposite, and | |
718 | * this function may be called multiple times, and will then actually | |
6819bc2e | 719 | * defragment the data and send it out as one packet as soon as |
1da177e4 LT |
720 | * possible, but at a safer point in time |
721 | */ | |
722 | while (count) { | |
723 | size = count; | |
724 | ||
725 | /* Adjust data size to the max data size */ | |
726 | if (size > self->max_data_size) | |
727 | size = self->max_data_size; | |
6819bc2e YH |
728 | |
729 | /* | |
1da177e4 | 730 | * Do we already have a buffer ready for transmit, or do |
6819bc2e | 731 | * we need to allocate a new frame |
1da177e4 | 732 | */ |
6819bc2e YH |
733 | if (skb) { |
734 | /* | |
735 | * Any room for more data at the end of the current | |
1da177e4 | 736 | * transmit buffer? Cannot use skb_tailroom, since |
6819bc2e | 737 | * dev_alloc_skb gives us a larger skb than we |
1da177e4 LT |
738 | * requested |
739 | * Note : use tx_data_size, because max_data_size | |
740 | * may have changed and we don't want to overwrite | |
741 | * the skb. - Jean II | |
742 | */ | |
743 | if ((tailroom = (self->tx_data_size - skb->len)) > 0) { | |
744 | /* Adjust data to tailroom */ | |
745 | if (size > tailroom) | |
746 | size = tailroom; | |
747 | } else { | |
6819bc2e YH |
748 | /* |
749 | * Current transmit frame is full, so break | |
1da177e4 LT |
750 | * out, so we can send it as soon as possible |
751 | */ | |
752 | break; | |
753 | } | |
754 | } else { | |
755 | /* Prepare a full sized frame */ | |
485fb2c9 SO |
756 | skb = alloc_skb(self->max_data_size+ |
757 | self->max_header_size, | |
758 | GFP_ATOMIC); | |
1da177e4 LT |
759 | if (!skb) { |
760 | spin_unlock_irqrestore(&self->spinlock, flags); | |
761 | return -ENOBUFS; | |
762 | } | |
763 | skb_reserve(skb, self->max_header_size); | |
764 | self->tx_skb = skb; | |
765 | /* Remember skb size because max_data_size may | |
766 | * change later on - Jean II */ | |
767 | self->tx_data_size = self->max_data_size; | |
768 | } | |
769 | ||
770 | /* Copy data */ | |
771 | memcpy(skb_put(skb,size), buf + len, size); | |
772 | ||
773 | count -= size; | |
774 | len += size; | |
775 | } | |
776 | ||
777 | spin_unlock_irqrestore(&self->spinlock, flags); | |
778 | ||
6819bc2e | 779 | /* |
1da177e4 LT |
780 | * Schedule a new thread which will transmit the frame as soon |
781 | * as possible, but at a safe point in time. We do this so the | |
782 | * "user" can give us data multiple times, as PPP does (because of | |
783 | * its 256 byte tx buffer). We will then defragment and send out | |
6819bc2e | 784 | * all this data as one single packet. |
1da177e4 LT |
785 | */ |
786 | schedule_work(&self->tqueue); | |
6819bc2e | 787 | |
1da177e4 LT |
788 | return len; |
789 | } | |
790 | ||
791 | /* | |
792 | * Function ircomm_tty_write_room (tty) | |
793 | * | |
794 | * This routine returns the numbers of characters the tty driver will | |
795 | * accept for queuing to be written. This number is subject to change as | |
796 | * output buffers get emptied, or if the output flow control is acted. | |
797 | */ | |
798 | static int ircomm_tty_write_room(struct tty_struct *tty) | |
799 | { | |
800 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
801 | unsigned long flags; | |
802 | int ret; | |
803 | ||
804 | IRDA_ASSERT(self != NULL, return -1;); | |
805 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
806 | ||
807 | #ifdef IRCOMM_NO_TX_BEFORE_INIT | |
808 | /* max_header_size tells us if the channel is initialised or not. */ | |
809 | if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) | |
810 | /* Don't bother us yet */ | |
811 | return 0; | |
812 | #endif | |
813 | ||
814 | /* Check if we are allowed to transmit any data. | |
815 | * hw_stopped is the regular flow control. | |
816 | * Jean II */ | |
817 | if (tty->hw_stopped) | |
818 | ret = 0; | |
819 | else { | |
820 | spin_lock_irqsave(&self->spinlock, flags); | |
821 | if (self->tx_skb) | |
822 | ret = self->tx_data_size - self->tx_skb->len; | |
823 | else | |
824 | ret = self->max_data_size; | |
825 | spin_unlock_irqrestore(&self->spinlock, flags); | |
826 | } | |
0dc47877 | 827 | IRDA_DEBUG(2, "%s(), ret=%d\n", __func__ , ret); |
1da177e4 LT |
828 | |
829 | return ret; | |
830 | } | |
831 | ||
832 | /* | |
833 | * Function ircomm_tty_wait_until_sent (tty, timeout) | |
834 | * | |
835 | * This routine waits until the device has written out all of the | |
836 | * characters in its transmitter FIFO. | |
837 | */ | |
838 | static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout) | |
839 | { | |
840 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
841 | unsigned long orig_jiffies, poll_time; | |
842 | unsigned long flags; | |
6819bc2e | 843 | |
0dc47877 | 844 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 LT |
845 | |
846 | IRDA_ASSERT(self != NULL, return;); | |
847 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
848 | ||
849 | orig_jiffies = jiffies; | |
850 | ||
851 | /* Set poll time to 200 ms */ | |
852 | poll_time = IRDA_MIN(timeout, msecs_to_jiffies(200)); | |
853 | ||
854 | spin_lock_irqsave(&self->spinlock, flags); | |
855 | while (self->tx_skb && self->tx_skb->len) { | |
856 | spin_unlock_irqrestore(&self->spinlock, flags); | |
121caf57 | 857 | schedule_timeout_interruptible(poll_time); |
1da177e4 LT |
858 | spin_lock_irqsave(&self->spinlock, flags); |
859 | if (signal_pending(current)) | |
860 | break; | |
861 | if (timeout && time_after(jiffies, orig_jiffies + timeout)) | |
862 | break; | |
863 | } | |
864 | spin_unlock_irqrestore(&self->spinlock, flags); | |
865 | current->state = TASK_RUNNING; | |
866 | } | |
867 | ||
868 | /* | |
869 | * Function ircomm_tty_throttle (tty) | |
870 | * | |
871 | * This routine notifies the tty driver that input buffers for the line | |
872 | * discipline are close to full, and it should somehow signal that no | |
6819bc2e | 873 | * more characters should be sent to the tty. |
1da177e4 LT |
874 | */ |
875 | static void ircomm_tty_throttle(struct tty_struct *tty) | |
876 | { | |
877 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
878 | ||
0dc47877 | 879 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 LT |
880 | |
881 | IRDA_ASSERT(self != NULL, return;); | |
882 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
883 | ||
884 | /* Software flow control? */ | |
885 | if (I_IXOFF(tty)) | |
886 | ircomm_tty_send_xchar(tty, STOP_CHAR(tty)); | |
6819bc2e | 887 | |
1da177e4 LT |
888 | /* Hardware flow control? */ |
889 | if (tty->termios->c_cflag & CRTSCTS) { | |
890 | self->settings.dte &= ~IRCOMM_RTS; | |
891 | self->settings.dte |= IRCOMM_DELTA_RTS; | |
6819bc2e | 892 | |
1da177e4 LT |
893 | ircomm_param_request(self, IRCOMM_DTE, TRUE); |
894 | } | |
895 | ||
6819bc2e | 896 | ircomm_flow_request(self->ircomm, FLOW_STOP); |
1da177e4 LT |
897 | } |
898 | ||
899 | /* | |
900 | * Function ircomm_tty_unthrottle (tty) | |
901 | * | |
902 | * This routine notifies the tty drivers that it should signals that | |
903 | * characters can now be sent to the tty without fear of overrunning the | |
904 | * input buffers of the line disciplines. | |
905 | */ | |
906 | static void ircomm_tty_unthrottle(struct tty_struct *tty) | |
907 | { | |
908 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
909 | ||
0dc47877 | 910 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 LT |
911 | |
912 | IRDA_ASSERT(self != NULL, return;); | |
913 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
914 | ||
915 | /* Using software flow control? */ | |
916 | if (I_IXOFF(tty)) { | |
917 | ircomm_tty_send_xchar(tty, START_CHAR(tty)); | |
918 | } | |
919 | ||
920 | /* Using hardware flow control? */ | |
921 | if (tty->termios->c_cflag & CRTSCTS) { | |
922 | self->settings.dte |= (IRCOMM_RTS|IRCOMM_DELTA_RTS); | |
923 | ||
924 | ircomm_param_request(self, IRCOMM_DTE, TRUE); | |
0dc47877 | 925 | IRDA_DEBUG(1, "%s(), FLOW_START\n", __func__ ); |
1da177e4 | 926 | } |
6819bc2e | 927 | ircomm_flow_request(self->ircomm, FLOW_START); |
1da177e4 LT |
928 | } |
929 | ||
930 | /* | |
931 | * Function ircomm_tty_chars_in_buffer (tty) | |
932 | * | |
933 | * Indicates if there are any data in the buffer | |
934 | * | |
935 | */ | |
936 | static int ircomm_tty_chars_in_buffer(struct tty_struct *tty) | |
937 | { | |
938 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
939 | unsigned long flags; | |
940 | int len = 0; | |
941 | ||
942 | IRDA_ASSERT(self != NULL, return -1;); | |
943 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
944 | ||
945 | spin_lock_irqsave(&self->spinlock, flags); | |
946 | ||
947 | if (self->tx_skb) | |
948 | len = self->tx_skb->len; | |
949 | ||
950 | spin_unlock_irqrestore(&self->spinlock, flags); | |
951 | ||
952 | return len; | |
953 | } | |
954 | ||
955 | static void ircomm_tty_shutdown(struct ircomm_tty_cb *self) | |
956 | { | |
957 | unsigned long flags; | |
958 | ||
959 | IRDA_ASSERT(self != NULL, return;); | |
960 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
961 | ||
0dc47877 | 962 | IRDA_DEBUG(0, "%s()\n", __func__ ); |
1da177e4 LT |
963 | |
964 | if (!test_and_clear_bit(ASYNC_B_INITIALIZED, &self->flags)) | |
965 | return; | |
966 | ||
967 | ircomm_tty_detach_cable(self); | |
968 | ||
969 | spin_lock_irqsave(&self->spinlock, flags); | |
970 | ||
971 | del_timer(&self->watchdog_timer); | |
6819bc2e | 972 | |
1da177e4 LT |
973 | /* Free parameter buffer */ |
974 | if (self->ctrl_skb) { | |
975 | dev_kfree_skb(self->ctrl_skb); | |
976 | self->ctrl_skb = NULL; | |
977 | } | |
978 | ||
979 | /* Free transmit buffer */ | |
980 | if (self->tx_skb) { | |
981 | dev_kfree_skb(self->tx_skb); | |
982 | self->tx_skb = NULL; | |
983 | } | |
984 | ||
985 | if (self->ircomm) { | |
986 | ircomm_close(self->ircomm); | |
987 | self->ircomm = NULL; | |
988 | } | |
989 | ||
990 | spin_unlock_irqrestore(&self->spinlock, flags); | |
991 | } | |
992 | ||
993 | /* | |
994 | * Function ircomm_tty_hangup (tty) | |
995 | * | |
996 | * This routine notifies the tty driver that it should hangup the tty | |
997 | * device. | |
6819bc2e | 998 | * |
1da177e4 LT |
999 | */ |
1000 | static void ircomm_tty_hangup(struct tty_struct *tty) | |
1001 | { | |
1002 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
1003 | unsigned long flags; | |
1004 | ||
0dc47877 | 1005 | IRDA_DEBUG(0, "%s()\n", __func__ ); |
1da177e4 LT |
1006 | |
1007 | IRDA_ASSERT(self != NULL, return;); | |
1008 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
1009 | ||
1010 | if (!tty) | |
1011 | return; | |
1012 | ||
1013 | /* ircomm_tty_flush_buffer(tty); */ | |
1014 | ircomm_tty_shutdown(self); | |
1015 | ||
1016 | /* I guess we need to lock here - Jean II */ | |
1017 | spin_lock_irqsave(&self->spinlock, flags); | |
1018 | self->flags &= ~ASYNC_NORMAL_ACTIVE; | |
1019 | self->tty = NULL; | |
1020 | self->open_count = 0; | |
1021 | spin_unlock_irqrestore(&self->spinlock, flags); | |
1022 | ||
1023 | wake_up_interruptible(&self->open_wait); | |
1024 | } | |
1025 | ||
1026 | /* | |
1027 | * Function ircomm_tty_send_xchar (tty, ch) | |
1028 | * | |
1029 | * This routine is used to send a high-priority XON/XOFF character to | |
1030 | * the device. | |
1031 | */ | |
1032 | static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch) | |
1033 | { | |
0dc47877 | 1034 | IRDA_DEBUG(0, "%s(), not impl\n", __func__ ); |
1da177e4 LT |
1035 | } |
1036 | ||
1037 | /* | |
1038 | * Function ircomm_tty_start (tty) | |
1039 | * | |
1040 | * This routine notifies the tty driver that it resume sending | |
6819bc2e | 1041 | * characters to the tty device. |
1da177e4 LT |
1042 | */ |
1043 | void ircomm_tty_start(struct tty_struct *tty) | |
1044 | { | |
1045 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
1046 | ||
1047 | ircomm_flow_request(self->ircomm, FLOW_START); | |
1048 | } | |
1049 | ||
1050 | /* | |
1051 | * Function ircomm_tty_stop (tty) | |
1052 | * | |
1053 | * This routine notifies the tty driver that it should stop outputting | |
6819bc2e | 1054 | * characters to the tty device. |
1da177e4 | 1055 | */ |
6819bc2e | 1056 | static void ircomm_tty_stop(struct tty_struct *tty) |
1da177e4 LT |
1057 | { |
1058 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
1059 | ||
1060 | IRDA_ASSERT(self != NULL, return;); | |
1061 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
1062 | ||
1063 | ircomm_flow_request(self->ircomm, FLOW_STOP); | |
1064 | } | |
1065 | ||
1066 | /* | |
1067 | * Function ircomm_check_modem_status (self) | |
1068 | * | |
1069 | * Check for any changes in the DCE's line settings. This function should | |
1070 | * be called whenever the dce parameter settings changes, to update the | |
1071 | * flow control settings and other things | |
1072 | */ | |
1073 | void ircomm_tty_check_modem_status(struct ircomm_tty_cb *self) | |
1074 | { | |
1075 | struct tty_struct *tty; | |
1076 | int status; | |
1077 | ||
0dc47877 | 1078 | IRDA_DEBUG(0, "%s()\n", __func__ ); |
1da177e4 LT |
1079 | |
1080 | IRDA_ASSERT(self != NULL, return;); | |
1081 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
1082 | ||
1083 | tty = self->tty; | |
1084 | ||
1085 | status = self->settings.dce; | |
1086 | ||
1087 | if (status & IRCOMM_DCE_DELTA_ANY) { | |
1088 | /*wake_up_interruptible(&self->delta_msr_wait);*/ | |
1089 | } | |
1090 | if ((self->flags & ASYNC_CHECK_CD) && (status & IRCOMM_DELTA_CD)) { | |
6819bc2e | 1091 | IRDA_DEBUG(2, |
0dc47877 | 1092 | "%s(), ircomm%d CD now %s...\n", __func__ , self->line, |
1da177e4 LT |
1093 | (status & IRCOMM_CD) ? "on" : "off"); |
1094 | ||
1095 | if (status & IRCOMM_CD) { | |
1096 | wake_up_interruptible(&self->open_wait); | |
1097 | } else { | |
6819bc2e | 1098 | IRDA_DEBUG(2, |
0dc47877 | 1099 | "%s(), Doing serial hangup..\n", __func__ ); |
1da177e4 LT |
1100 | if (tty) |
1101 | tty_hangup(tty); | |
1102 | ||
1103 | /* Hangup will remote the tty, so better break out */ | |
1104 | return; | |
1105 | } | |
1106 | } | |
1107 | if (self->flags & ASYNC_CTS_FLOW) { | |
1108 | if (tty->hw_stopped) { | |
1109 | if (status & IRCOMM_CTS) { | |
6819bc2e | 1110 | IRDA_DEBUG(2, |
0dc47877 | 1111 | "%s(), CTS tx start...\n", __func__ ); |
1da177e4 | 1112 | tty->hw_stopped = 0; |
6819bc2e | 1113 | |
1da177e4 LT |
1114 | /* Wake up processes blocked on open */ |
1115 | wake_up_interruptible(&self->open_wait); | |
1116 | ||
1117 | schedule_work(&self->tqueue); | |
1118 | return; | |
1119 | } | |
1120 | } else { | |
1121 | if (!(status & IRCOMM_CTS)) { | |
6819bc2e | 1122 | IRDA_DEBUG(2, |
0dc47877 | 1123 | "%s(), CTS tx stop...\n", __func__ ); |
1da177e4 LT |
1124 | tty->hw_stopped = 1; |
1125 | } | |
1126 | } | |
1127 | } | |
1128 | } | |
1129 | ||
1130 | /* | |
1131 | * Function ircomm_tty_data_indication (instance, sap, skb) | |
1132 | * | |
1133 | * Handle incoming data, and deliver it to the line discipline | |
1134 | * | |
1135 | */ | |
1136 | static int ircomm_tty_data_indication(void *instance, void *sap, | |
1137 | struct sk_buff *skb) | |
1138 | { | |
1139 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; | |
a352def2 | 1140 | struct tty_ldisc *ld; |
1da177e4 | 1141 | |
0dc47877 | 1142 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
6819bc2e | 1143 | |
1da177e4 LT |
1144 | IRDA_ASSERT(self != NULL, return -1;); |
1145 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
1146 | IRDA_ASSERT(skb != NULL, return -1;); | |
1147 | ||
1148 | if (!self->tty) { | |
0dc47877 | 1149 | IRDA_DEBUG(0, "%s(), no tty!\n", __func__ ); |
1da177e4 LT |
1150 | return 0; |
1151 | } | |
1152 | ||
6819bc2e | 1153 | /* |
1da177e4 LT |
1154 | * If we receive data when hardware is stopped then something is wrong. |
1155 | * We try to poll the peers line settings to check if we are up todate. | |
6819bc2e | 1156 | * Devices like WinCE can do this, and since they don't send any |
1da177e4 LT |
1157 | * params, we can just as well declare the hardware for running. |
1158 | */ | |
1159 | if (self->tty->hw_stopped && (self->flow == FLOW_START)) { | |
0dc47877 | 1160 | IRDA_DEBUG(0, "%s(), polling for line settings!\n", __func__ ); |
1da177e4 LT |
1161 | ircomm_param_request(self, IRCOMM_POLL, TRUE); |
1162 | ||
1163 | /* We can just as well declare the hardware for running */ | |
1164 | ircomm_tty_send_initial_parameters(self); | |
1165 | ircomm_tty_link_established(self); | |
1166 | } | |
1167 | ||
6819bc2e | 1168 | /* |
1da177e4 | 1169 | * Just give it over to the line discipline. There is no need to |
6819bc2e | 1170 | * involve the flip buffers, since we are not running in an interrupt |
1da177e4 LT |
1171 | * handler |
1172 | */ | |
a352def2 AC |
1173 | |
1174 | ld = tty_ldisc_ref(self->tty); | |
1175 | if (ld) | |
1176 | ld->ops->receive_buf(self->tty, skb->data, NULL, skb->len); | |
1177 | tty_ldisc_deref(ld); | |
1da177e4 LT |
1178 | |
1179 | /* No need to kfree_skb - see ircomm_ttp_data_indication() */ | |
1180 | ||
1181 | return 0; | |
1182 | } | |
1183 | ||
1184 | /* | |
1185 | * Function ircomm_tty_control_indication (instance, sap, skb) | |
1186 | * | |
1187 | * Parse all incoming parameters (easy!) | |
1188 | * | |
1189 | */ | |
1190 | static int ircomm_tty_control_indication(void *instance, void *sap, | |
1191 | struct sk_buff *skb) | |
1192 | { | |
1193 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; | |
1194 | int clen; | |
1195 | ||
0dc47877 | 1196 | IRDA_DEBUG(4, "%s()\n", __func__ ); |
6819bc2e | 1197 | |
1da177e4 LT |
1198 | IRDA_ASSERT(self != NULL, return -1;); |
1199 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
1200 | IRDA_ASSERT(skb != NULL, return -1;); | |
1201 | ||
1202 | clen = skb->data[0]; | |
1203 | ||
6819bc2e | 1204 | irda_param_extract_all(self, skb->data+1, IRDA_MIN(skb->len-1, clen), |
1da177e4 LT |
1205 | &ircomm_param_info); |
1206 | ||
1207 | /* No need to kfree_skb - see ircomm_control_indication() */ | |
1208 | ||
1209 | return 0; | |
1210 | } | |
1211 | ||
1212 | /* | |
1213 | * Function ircomm_tty_flow_indication (instance, sap, cmd) | |
1214 | * | |
1215 | * This function is called by IrTTP when it wants us to slow down the | |
1216 | * transmission of data. We just mark the hardware as stopped, and wait | |
1217 | * for IrTTP to notify us that things are OK again. | |
1218 | */ | |
6819bc2e | 1219 | static void ircomm_tty_flow_indication(void *instance, void *sap, |
1da177e4 LT |
1220 | LOCAL_FLOW cmd) |
1221 | { | |
1222 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; | |
1223 | struct tty_struct *tty; | |
1224 | ||
1225 | IRDA_ASSERT(self != NULL, return;); | |
1226 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
1227 | ||
1228 | tty = self->tty; | |
1229 | ||
1230 | switch (cmd) { | |
1231 | case FLOW_START: | |
0dc47877 | 1232 | IRDA_DEBUG(2, "%s(), hw start!\n", __func__ ); |
1da177e4 LT |
1233 | tty->hw_stopped = 0; |
1234 | ||
1235 | /* ircomm_tty_do_softint will take care of the rest */ | |
1236 | schedule_work(&self->tqueue); | |
1237 | break; | |
1238 | default: /* If we get here, something is very wrong, better stop */ | |
1239 | case FLOW_STOP: | |
0dc47877 | 1240 | IRDA_DEBUG(2, "%s(), hw stopped!\n", __func__ ); |
1da177e4 LT |
1241 | tty->hw_stopped = 1; |
1242 | break; | |
1243 | } | |
1244 | self->flow = cmd; | |
1245 | } | |
1246 | ||
92b05e13 | 1247 | #ifdef CONFIG_PROC_FS |
3d304176 | 1248 | static void ircomm_tty_line_info(struct ircomm_tty_cb *self, struct seq_file *m) |
1da177e4 | 1249 | { |
3d304176 | 1250 | char sep; |
1da177e4 | 1251 | |
3d304176 | 1252 | seq_printf(m, "State: %s\n", ircomm_tty_state[self->state]); |
1da177e4 | 1253 | |
3d304176 | 1254 | seq_puts(m, "Service type: "); |
1da177e4 | 1255 | if (self->service_type & IRCOMM_9_WIRE) |
3d304176 | 1256 | seq_puts(m, "9_WIRE"); |
1da177e4 | 1257 | else if (self->service_type & IRCOMM_3_WIRE) |
3d304176 | 1258 | seq_puts(m, "3_WIRE"); |
1da177e4 | 1259 | else if (self->service_type & IRCOMM_3_WIRE_RAW) |
3d304176 | 1260 | seq_puts(m, "3_WIRE_RAW"); |
1da177e4 | 1261 | else |
3d304176 AD |
1262 | seq_puts(m, "No common service type!\n"); |
1263 | seq_putc(m, '\n'); | |
1264 | ||
1265 | seq_printf(m, "Port name: %s\n", self->settings.port_name); | |
1266 | ||
1267 | seq_printf(m, "DTE status:"); | |
1268 | sep = ' '; | |
1269 | if (self->settings.dte & IRCOMM_RTS) { | |
1270 | seq_printf(m, "%cRTS", sep); | |
1271 | sep = '|'; | |
1272 | } | |
1273 | if (self->settings.dte & IRCOMM_DTR) { | |
1274 | seq_printf(m, "%cDTR", sep); | |
1275 | sep = '|'; | |
1276 | } | |
1277 | seq_putc(m, '\n'); | |
1278 | ||
1279 | seq_puts(m, "DCE status:"); | |
1280 | sep = ' '; | |
1281 | if (self->settings.dce & IRCOMM_CTS) { | |
1282 | seq_printf(m, "%cCTS", sep); | |
1283 | sep = '|'; | |
1284 | } | |
1285 | if (self->settings.dce & IRCOMM_DSR) { | |
1286 | seq_printf(m, "%cDSR", sep); | |
1287 | sep = '|'; | |
1288 | } | |
1289 | if (self->settings.dce & IRCOMM_CD) { | |
1290 | seq_printf(m, "%cCD", sep); | |
1291 | sep = '|'; | |
1292 | } | |
1293 | if (self->settings.dce & IRCOMM_RI) { | |
1294 | seq_printf(m, "%cRI", sep); | |
1295 | sep = '|'; | |
1296 | } | |
1297 | seq_putc(m, '\n'); | |
1298 | ||
1299 | seq_puts(m, "Configuration: "); | |
1da177e4 | 1300 | if (!self->settings.null_modem) |
3d304176 | 1301 | seq_puts(m, "DTE <-> DCE\n"); |
1da177e4 | 1302 | else |
3d304176 AD |
1303 | seq_puts(m, "DTE <-> DTE (null modem emulation)\n"); |
1304 | ||
1305 | seq_printf(m, "Data rate: %d\n", self->settings.data_rate); | |
1306 | ||
1307 | seq_puts(m, "Flow control:"); | |
1308 | sep = ' '; | |
1309 | if (self->settings.flow_control & IRCOMM_XON_XOFF_IN) { | |
1310 | seq_printf(m, "%cXON_XOFF_IN", sep); | |
1311 | sep = '|'; | |
1312 | } | |
1313 | if (self->settings.flow_control & IRCOMM_XON_XOFF_OUT) { | |
1314 | seq_printf(m, "%cXON_XOFF_OUT", sep); | |
1315 | sep = '|'; | |
1316 | } | |
1317 | if (self->settings.flow_control & IRCOMM_RTS_CTS_IN) { | |
1318 | seq_printf(m, "%cRTS_CTS_IN", sep); | |
1319 | sep = '|'; | |
1320 | } | |
1321 | if (self->settings.flow_control & IRCOMM_RTS_CTS_OUT) { | |
1322 | seq_printf(m, "%cRTS_CTS_OUT", sep); | |
1323 | sep = '|'; | |
1324 | } | |
1325 | if (self->settings.flow_control & IRCOMM_DSR_DTR_IN) { | |
1326 | seq_printf(m, "%cDSR_DTR_IN", sep); | |
1327 | sep = '|'; | |
1328 | } | |
1329 | if (self->settings.flow_control & IRCOMM_DSR_DTR_OUT) { | |
1330 | seq_printf(m, "%cDSR_DTR_OUT", sep); | |
1331 | sep = '|'; | |
1332 | } | |
1333 | if (self->settings.flow_control & IRCOMM_ENQ_ACK_IN) { | |
1334 | seq_printf(m, "%cENQ_ACK_IN", sep); | |
1335 | sep = '|'; | |
1336 | } | |
1337 | if (self->settings.flow_control & IRCOMM_ENQ_ACK_OUT) { | |
1338 | seq_printf(m, "%cENQ_ACK_OUT", sep); | |
1339 | sep = '|'; | |
1340 | } | |
1341 | seq_putc(m, '\n'); | |
1342 | ||
1343 | seq_puts(m, "Flags:"); | |
1344 | sep = ' '; | |
1345 | if (self->flags & ASYNC_CTS_FLOW) { | |
1346 | seq_printf(m, "%cASYNC_CTS_FLOW", sep); | |
1347 | sep = '|'; | |
1348 | } | |
1349 | if (self->flags & ASYNC_CHECK_CD) { | |
1350 | seq_printf(m, "%cASYNC_CHECK_CD", sep); | |
1351 | sep = '|'; | |
1352 | } | |
1353 | if (self->flags & ASYNC_INITIALIZED) { | |
1354 | seq_printf(m, "%cASYNC_INITIALIZED", sep); | |
1355 | sep = '|'; | |
1356 | } | |
1357 | if (self->flags & ASYNC_LOW_LATENCY) { | |
1358 | seq_printf(m, "%cASYNC_LOW_LATENCY", sep); | |
1359 | sep = '|'; | |
1360 | } | |
1361 | if (self->flags & ASYNC_CLOSING) { | |
1362 | seq_printf(m, "%cASYNC_CLOSING", sep); | |
1363 | sep = '|'; | |
1364 | } | |
1365 | if (self->flags & ASYNC_NORMAL_ACTIVE) { | |
1366 | seq_printf(m, "%cASYNC_NORMAL_ACTIVE", sep); | |
1367 | sep = '|'; | |
1368 | } | |
1369 | seq_putc(m, '\n'); | |
1370 | ||
1371 | seq_printf(m, "Role: %s\n", self->client ? "client" : "server"); | |
1372 | seq_printf(m, "Open count: %d\n", self->open_count); | |
1373 | seq_printf(m, "Max data size: %d\n", self->max_data_size); | |
1374 | seq_printf(m, "Max header size: %d\n", self->max_header_size); | |
6819bc2e | 1375 | |
1da177e4 | 1376 | if (self->tty) |
3d304176 | 1377 | seq_printf(m, "Hardware: %s\n", |
1da177e4 | 1378 | self->tty->hw_stopped ? "Stopped" : "Running"); |
1da177e4 LT |
1379 | } |
1380 | ||
3d304176 | 1381 | static int ircomm_tty_proc_show(struct seq_file *m, void *v) |
1da177e4 LT |
1382 | { |
1383 | struct ircomm_tty_cb *self; | |
1da177e4 LT |
1384 | unsigned long flags; |
1385 | ||
1386 | spin_lock_irqsave(&ircomm_tty->hb_spinlock, flags); | |
1387 | ||
1388 | self = (struct ircomm_tty_cb *) hashbin_get_first(ircomm_tty); | |
3d304176 | 1389 | while (self != NULL) { |
1da177e4 LT |
1390 | if (self->magic != IRCOMM_TTY_MAGIC) |
1391 | break; | |
1392 | ||
3d304176 | 1393 | ircomm_tty_line_info(self, m); |
1da177e4 | 1394 | self = (struct ircomm_tty_cb *) hashbin_get_next(ircomm_tty); |
6819bc2e | 1395 | } |
1da177e4 | 1396 | spin_unlock_irqrestore(&ircomm_tty->hb_spinlock, flags); |
3d304176 AD |
1397 | return 0; |
1398 | } | |
1da177e4 | 1399 | |
3d304176 AD |
1400 | static int ircomm_tty_proc_open(struct inode *inode, struct file *file) |
1401 | { | |
1402 | return single_open(file, ircomm_tty_proc_show, NULL); | |
1da177e4 | 1403 | } |
3d304176 AD |
1404 | |
1405 | static const struct file_operations ircomm_tty_proc_fops = { | |
1406 | .owner = THIS_MODULE, | |
1407 | .open = ircomm_tty_proc_open, | |
1408 | .read = seq_read, | |
1409 | .llseek = seq_lseek, | |
1410 | .release = single_release, | |
1411 | }; | |
1da177e4 LT |
1412 | #endif /* CONFIG_PROC_FS */ |
1413 | ||
1414 | MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>"); | |
1415 | MODULE_DESCRIPTION("IrCOMM serial TTY driver"); | |
1416 | MODULE_LICENSE("GPL"); | |
1417 | MODULE_ALIAS_CHARDEV_MAJOR(IRCOMM_TTY_MAJOR); | |
1418 | ||
1419 | module_init(ircomm_tty_init); | |
1420 | module_exit(ircomm_tty_cleanup); |