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> | |
5a0e3ad6 | 36 | #include <linux/slab.h> |
1da177e4 | 37 | #include <linux/sched.h> |
3d304176 | 38 | #include <linux/seq_file.h> |
1da177e4 LT |
39 | #include <linux/termios.h> |
40 | #include <linux/tty.h> | |
cbfd1526 | 41 | #include <linux/tty_flip.h> |
1da177e4 LT |
42 | #include <linux/interrupt.h> |
43 | #include <linux/device.h> /* for MODULE_ALIAS_CHARDEV_MAJOR */ | |
44 | ||
45 | #include <asm/uaccess.h> | |
46 | ||
47 | #include <net/irda/irda.h> | |
48 | #include <net/irda/irmod.h> | |
49 | ||
50 | #include <net/irda/ircomm_core.h> | |
51 | #include <net/irda/ircomm_param.h> | |
52 | #include <net/irda/ircomm_tty_attach.h> | |
53 | #include <net/irda/ircomm_tty.h> | |
54 | ||
55 | static int ircomm_tty_open(struct tty_struct *tty, struct file *filp); | |
56 | static void ircomm_tty_close(struct tty_struct * tty, struct file *filp); | |
57 | static int ircomm_tty_write(struct tty_struct * tty, | |
58 | const unsigned char *buf, int count); | |
59 | static int ircomm_tty_write_room(struct tty_struct *tty); | |
60 | static void ircomm_tty_throttle(struct tty_struct *tty); | |
61 | static void ircomm_tty_unthrottle(struct tty_struct *tty); | |
62 | static int ircomm_tty_chars_in_buffer(struct tty_struct *tty); | |
63 | static void ircomm_tty_flush_buffer(struct tty_struct *tty); | |
64 | static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch); | |
65 | static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout); | |
66 | static void ircomm_tty_hangup(struct tty_struct *tty); | |
c4028958 | 67 | static void ircomm_tty_do_softint(struct work_struct *work); |
1da177e4 LT |
68 | static void ircomm_tty_shutdown(struct ircomm_tty_cb *self); |
69 | static void ircomm_tty_stop(struct tty_struct *tty); | |
70 | ||
71 | static int ircomm_tty_data_indication(void *instance, void *sap, | |
72 | struct sk_buff *skb); | |
73 | static int ircomm_tty_control_indication(void *instance, void *sap, | |
74 | struct sk_buff *skb); | |
6819bc2e | 75 | static void ircomm_tty_flow_indication(void *instance, void *sap, |
1da177e4 LT |
76 | LOCAL_FLOW cmd); |
77 | #ifdef CONFIG_PROC_FS | |
3d304176 | 78 | static const struct file_operations ircomm_tty_proc_fops; |
1da177e4 LT |
79 | #endif /* CONFIG_PROC_FS */ |
80 | static struct tty_driver *driver; | |
81 | ||
d76081f8 | 82 | static hashbin_t *ircomm_tty = NULL; |
1da177e4 | 83 | |
b68e31d0 | 84 | static const struct tty_operations ops = { |
1da177e4 LT |
85 | .open = ircomm_tty_open, |
86 | .close = ircomm_tty_close, | |
87 | .write = ircomm_tty_write, | |
88 | .write_room = ircomm_tty_write_room, | |
89 | .chars_in_buffer = ircomm_tty_chars_in_buffer, | |
90 | .flush_buffer = ircomm_tty_flush_buffer, | |
91 | .ioctl = ircomm_tty_ioctl, /* ircomm_tty_ioctl.c */ | |
92 | .tiocmget = ircomm_tty_tiocmget, /* ircomm_tty_ioctl.c */ | |
93 | .tiocmset = ircomm_tty_tiocmset, /* ircomm_tty_ioctl.c */ | |
94 | .throttle = ircomm_tty_throttle, | |
95 | .unthrottle = ircomm_tty_unthrottle, | |
96 | .send_xchar = ircomm_tty_send_xchar, | |
97 | .set_termios = ircomm_tty_set_termios, | |
98 | .stop = ircomm_tty_stop, | |
99 | .start = ircomm_tty_start, | |
100 | .hangup = ircomm_tty_hangup, | |
101 | .wait_until_sent = ircomm_tty_wait_until_sent, | |
102 | #ifdef CONFIG_PROC_FS | |
3d304176 | 103 | .proc_fops = &ircomm_tty_proc_fops, |
1da177e4 LT |
104 | #endif /* CONFIG_PROC_FS */ |
105 | }; | |
106 | ||
107 | /* | |
108 | * Function ircomm_tty_init() | |
109 | * | |
110 | * Init IrCOMM TTY layer/driver | |
111 | * | |
112 | */ | |
113 | static int __init ircomm_tty_init(void) | |
114 | { | |
115 | driver = alloc_tty_driver(IRCOMM_TTY_PORTS); | |
116 | if (!driver) | |
117 | return -ENOMEM; | |
6819bc2e | 118 | ircomm_tty = hashbin_new(HB_LOCK); |
1da177e4 | 119 | if (ircomm_tty == NULL) { |
0dc47877 | 120 | IRDA_ERROR("%s(), can't allocate hashbin!\n", __func__); |
1da177e4 LT |
121 | put_tty_driver(driver); |
122 | return -ENOMEM; | |
123 | } | |
124 | ||
125 | driver->owner = THIS_MODULE; | |
126 | driver->driver_name = "ircomm"; | |
127 | driver->name = "ircomm"; | |
1da177e4 LT |
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", | |
0dc47877 | 138 | __func__); |
1da177e4 LT |
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 | { | |
0dc47877 | 147 | IRDA_DEBUG(0, "%s()\n", __func__ ); |
1da177e4 LT |
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 | ||
0dc47877 | 168 | IRDA_DEBUG(4, "%s()\n", __func__ ); |
1da177e4 LT |
169 | |
170 | ret = tty_unregister_driver(driver); | |
6819bc2e YH |
171 | if (ret) { |
172 | IRDA_ERROR("%s(), failed to unregister driver\n", | |
0dc47877 | 173 | __func__); |
1da177e4 LT |
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 | * | |
6819bc2e | 184 | * |
1da177e4 LT |
185 | * |
186 | */ | |
187 | static int ircomm_tty_startup(struct ircomm_tty_cb *self) | |
188 | { | |
189 | notify_t notify; | |
190 | int ret = -ENODEV; | |
191 | ||
0dc47877 | 192 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 LT |
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)) { | |
0dc47877 | 199 | IRDA_DEBUG(2, "%s(), already open so break out!\n", __func__ ); |
1da177e4 LT |
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; | |
6819bc2e | 208 | notify.flow_indication = ircomm_tty_flow_indication; |
1da177e4 LT |
209 | |
210 | /* Use the ircomm_tty interface for these ones */ | |
6819bc2e | 211 | notify.disconnect_indication = ircomm_tty_disconnect_indication; |
1da177e4 | 212 | notify.connect_confirm = ircomm_tty_connect_confirm; |
6819bc2e | 213 | notify.connect_indication = ircomm_tty_connect_indication; |
1da177e4 LT |
214 | strlcpy(notify.name, "ircomm_tty", sizeof(notify.name)); |
215 | notify.instance = self; | |
216 | ||
217 | if (!self->ircomm) { | |
6819bc2e | 218 | self->ircomm = ircomm_open(¬ify, self->service_type, |
1da177e4 LT |
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) { | |
0dc47877 | 229 | IRDA_ERROR("%s(), error attaching cable!\n", __func__); |
1da177e4 LT |
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 | * | |
6819bc2e | 242 | * |
1da177e4 LT |
243 | * |
244 | */ | |
6819bc2e | 245 | static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self, |
1da177e4 LT |
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; | |
6819bc2e | 253 | |
0dc47877 | 254 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 LT |
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. | |
6819bc2e | 261 | */ |
1da177e4 LT |
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; | |
0dc47877 | 265 | IRDA_DEBUG(1, "%s(), O_NONBLOCK requested!\n", __func__ ); |
1da177e4 LT |
266 | return 0; |
267 | } | |
268 | ||
269 | if (tty->termios->c_cflag & CLOCAL) { | |
0dc47877 | 270 | IRDA_DEBUG(1, "%s(), doing CLOCAL!\n", __func__ ); |
1da177e4 LT |
271 | do_clocal = 1; |
272 | } | |
6819bc2e | 273 | |
1da177e4 LT |
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 | */ | |
6819bc2e | 280 | |
1da177e4 LT |
281 | retval = 0; |
282 | add_wait_queue(&self->open_wait, &wait); | |
6819bc2e | 283 | |
1da177e4 LT |
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++; | |
6819bc2e | 295 | |
1da177e4 LT |
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; | |
6819bc2e | 303 | |
1da177e4 LT |
304 | ircomm_param_request(self, IRCOMM_DTE, TRUE); |
305 | } | |
6819bc2e | 306 | |
1da177e4 | 307 | current->state = TASK_INTERRUPTIBLE; |
6819bc2e | 308 | |
1da177e4 LT |
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 | } | |
6819bc2e YH |
315 | |
316 | /* | |
1da177e4 LT |
317 | * Check if link is ready now. Even if CLOCAL is |
318 | * specified, we cannot return before the IrCOMM link is | |
6819bc2e | 319 | * ready |
1da177e4 | 320 | */ |
6819bc2e YH |
321 | if (!test_bit(ASYNC_B_CLOSING, &self->flags) && |
322 | (do_clocal || (self->settings.dce & IRCOMM_CD)) && | |
1da177e4 LT |
323 | self->state == IRCOMM_TTY_READY) |
324 | { | |
6819bc2e | 325 | break; |
1da177e4 | 326 | } |
6819bc2e | 327 | |
1da177e4 LT |
328 | if (signal_pending(current)) { |
329 | retval = -ERESTARTSYS; | |
330 | break; | |
331 | } | |
6819bc2e | 332 | |
1da177e4 LT |
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 ); | |
6819bc2e | 335 | |
1da177e4 LT |
336 | schedule(); |
337 | } | |
6819bc2e | 338 | |
1da177e4 LT |
339 | __set_current_state(TASK_RUNNING); |
340 | remove_wait_queue(&self->open_wait, &wait); | |
6819bc2e | 341 | |
1da177e4 LT |
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--; | |
6819bc2e | 349 | |
1da177e4 LT |
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); | |
6819bc2e | 352 | |
1da177e4 LT |
353 | if (!retval) |
354 | self->flags |= ASYNC_NORMAL_ACTIVE; | |
6819bc2e YH |
355 | |
356 | return retval; | |
1da177e4 LT |
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 | ||
0dc47877 | 373 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 LT |
374 | |
375 | line = tty->index; | |
ad36b88e | 376 | if (line >= IRCOMM_TTY_PORTS) |
1da177e4 | 377 | return -ENODEV; |
1da177e4 LT |
378 | |
379 | /* Check if instance already exists */ | |
380 | self = hashbin_lock_find(ircomm_tty, line, NULL); | |
381 | if (!self) { | |
382 | /* No, so make new instance */ | |
0da974f4 | 383 | self = kzalloc(sizeof(struct ircomm_tty_cb), GFP_KERNEL); |
1da177e4 | 384 | if (self == NULL) { |
0dc47877 | 385 | IRDA_ERROR("%s(), kmalloc failed!\n", __func__); |
1da177e4 LT |
386 | return -ENOMEM; |
387 | } | |
6819bc2e | 388 | |
1da177e4 LT |
389 | self->magic = IRCOMM_TTY_MAGIC; |
390 | self->flow = FLOW_STOP; | |
391 | ||
392 | self->line = line; | |
c4028958 | 393 | INIT_WORK(&self->tqueue, ircomm_tty_do_softint); |
1da177e4 LT |
394 | self->max_header_size = IRCOMM_TTY_HDR_UNINITIALISED; |
395 | self->max_data_size = IRCOMM_TTY_DATA_UNINITIALISED; | |
396 | self->close_delay = 5*HZ/10; | |
397 | self->closing_wait = 30*HZ; | |
398 | ||
399 | /* Init some important stuff */ | |
400 | init_timer(&self->watchdog_timer); | |
401 | init_waitqueue_head(&self->open_wait); | |
6819bc2e | 402 | init_waitqueue_head(&self->close_wait); |
1da177e4 LT |
403 | spin_lock_init(&self->spinlock); |
404 | ||
6819bc2e | 405 | /* |
1da177e4 LT |
406 | * Force TTY into raw mode by default which is usually what |
407 | * we want for IrCOMM and IrLPT. This way applications will | |
6819bc2e | 408 | * not have to twiddle with printcap etc. |
ad36b88e AC |
409 | * |
410 | * Note this is completely usafe and doesn't work properly | |
1da177e4 LT |
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 | ||
0dc47877 | 426 | IRDA_DEBUG(1, "%s(), %s%d, count = %d\n", __func__ , tty->driver->name, |
1da177e4 LT |
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", | |
0dc47877 | 448 | __func__); |
1da177e4 LT |
449 | return -ERESTARTSYS; |
450 | } | |
451 | ||
452 | #ifdef SERIAL_DO_RESTART | |
a02cec21 ED |
453 | return (self->flags & ASYNC_HUP_NOTIFY) ? |
454 | -EAGAIN : -ERESTARTSYS; | |
1da177e4 LT |
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 */ | |
0dc47877 | 466 | IRDA_DEBUG(2, "%s(), IrCOMM device\n", __func__ ); |
1da177e4 | 467 | } else { |
0dc47877 | 468 | IRDA_DEBUG(2, "%s(), IrLPT device\n", __func__ ); |
1da177e4 LT |
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) { | |
6819bc2e | 479 | IRDA_DEBUG(2, |
0dc47877 | 480 | "%s(), returning after block_til_ready with %d\n", __func__ , |
1da177e4 LT |
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 | ||
0dc47877 | 499 | IRDA_DEBUG(0, "%s()\n", __func__ ); |
1da177e4 | 500 | |
1da177e4 LT |
501 | IRDA_ASSERT(self != NULL, return;); |
502 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
503 | ||
504 | spin_lock_irqsave(&self->spinlock, flags); | |
505 | ||
506 | if (tty_hung_up_p(filp)) { | |
507 | spin_unlock_irqrestore(&self->spinlock, flags); | |
508 | ||
0dc47877 | 509 | IRDA_DEBUG(0, "%s(), returning 1\n", __func__ ); |
1da177e4 LT |
510 | return; |
511 | } | |
512 | ||
513 | if ((tty->count == 1) && (self->open_count != 1)) { | |
514 | /* | |
515 | * Uh, oh. tty->count is 1, which means that the tty | |
516 | * structure will be freed. state->count should always | |
517 | * be one in these conditions. If it's greater than | |
518 | * one, we've got real problems, since it means the | |
519 | * serial port won't be shutdown. | |
520 | */ | |
521 | IRDA_DEBUG(0, "%s(), bad serial port count; " | |
0dc47877 | 522 | "tty->count is 1, state->count is %d\n", __func__ , |
1da177e4 LT |
523 | self->open_count); |
524 | self->open_count = 1; | |
525 | } | |
526 | ||
527 | if (--self->open_count < 0) { | |
528 | IRDA_ERROR("%s(), bad serial port count for ttys%d: %d\n", | |
0dc47877 | 529 | __func__, self->line, self->open_count); |
1da177e4 LT |
530 | self->open_count = 0; |
531 | } | |
532 | if (self->open_count) { | |
533 | spin_unlock_irqrestore(&self->spinlock, flags); | |
534 | ||
0dc47877 | 535 | IRDA_DEBUG(0, "%s(), open count > 0\n", __func__ ); |
1da177e4 LT |
536 | return; |
537 | } | |
538 | ||
539 | /* Hum... Should be test_and_set_bit ??? - Jean II */ | |
540 | set_bit(ASYNC_B_CLOSING, &self->flags); | |
541 | ||
542 | /* We need to unlock here (we were unlocking at the end of this | |
543 | * function), because tty_wait_until_sent() may schedule. | |
544 | * I don't know if the rest should be protected somehow, | |
545 | * so someone should check. - Jean II */ | |
546 | spin_unlock_irqrestore(&self->spinlock, flags); | |
547 | ||
548 | /* | |
6819bc2e | 549 | * Now we wait for the transmit buffer to clear; and we notify |
1da177e4 LT |
550 | * the line discipline to only process XON/XOFF characters. |
551 | */ | |
552 | tty->closing = 1; | |
553 | if (self->closing_wait != ASYNC_CLOSING_WAIT_NONE) | |
554 | tty_wait_until_sent(tty, self->closing_wait); | |
555 | ||
556 | ircomm_tty_shutdown(self); | |
557 | ||
f34d7a5b AC |
558 | tty_driver_flush_buffer(tty); |
559 | tty_ldisc_flush(tty); | |
1da177e4 LT |
560 | |
561 | tty->closing = 0; | |
562 | self->tty = NULL; | |
563 | ||
564 | if (self->blocked_open) { | |
121caf57 NA |
565 | if (self->close_delay) |
566 | schedule_timeout_interruptible(self->close_delay); | |
1da177e4 LT |
567 | wake_up_interruptible(&self->open_wait); |
568 | } | |
569 | ||
570 | self->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING); | |
571 | wake_up_interruptible(&self->close_wait); | |
572 | } | |
573 | ||
574 | /* | |
575 | * Function ircomm_tty_flush_buffer (tty) | |
576 | * | |
6819bc2e | 577 | * |
1da177e4 LT |
578 | * |
579 | */ | |
580 | static void ircomm_tty_flush_buffer(struct tty_struct *tty) | |
581 | { | |
582 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
583 | ||
584 | IRDA_ASSERT(self != NULL, return;); | |
585 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
586 | ||
6819bc2e YH |
587 | /* |
588 | * Let do_softint() do this to avoid race condition with | |
589 | * do_softint() ;-) | |
1da177e4 LT |
590 | */ |
591 | schedule_work(&self->tqueue); | |
592 | } | |
593 | ||
594 | /* | |
c4028958 | 595 | * Function ircomm_tty_do_softint (work) |
1da177e4 LT |
596 | * |
597 | * We use this routine to give the write wakeup to the user at at a | |
6819bc2e | 598 | * safe time (as fast as possible after write have completed). This |
1da177e4 LT |
599 | * can be compared to the Tx interrupt. |
600 | */ | |
c4028958 | 601 | static void ircomm_tty_do_softint(struct work_struct *work) |
1da177e4 | 602 | { |
c4028958 DH |
603 | struct ircomm_tty_cb *self = |
604 | container_of(work, struct ircomm_tty_cb, tqueue); | |
1da177e4 LT |
605 | struct tty_struct *tty; |
606 | unsigned long flags; | |
607 | struct sk_buff *skb, *ctrl_skb; | |
608 | ||
0dc47877 | 609 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 LT |
610 | |
611 | if (!self || self->magic != IRCOMM_TTY_MAGIC) | |
612 | return; | |
613 | ||
614 | tty = self->tty; | |
615 | if (!tty) | |
616 | return; | |
617 | ||
618 | /* Unlink control buffer */ | |
619 | spin_lock_irqsave(&self->spinlock, flags); | |
620 | ||
621 | ctrl_skb = self->ctrl_skb; | |
622 | self->ctrl_skb = NULL; | |
623 | ||
624 | spin_unlock_irqrestore(&self->spinlock, flags); | |
625 | ||
626 | /* Flush control buffer if any */ | |
627 | if(ctrl_skb) { | |
628 | if(self->flow == FLOW_START) | |
629 | ircomm_control_request(self->ircomm, ctrl_skb); | |
630 | /* Drop reference count - see ircomm_ttp_data_request(). */ | |
631 | dev_kfree_skb(ctrl_skb); | |
632 | } | |
633 | ||
634 | if (tty->hw_stopped) | |
635 | return; | |
636 | ||
637 | /* Unlink transmit buffer */ | |
638 | spin_lock_irqsave(&self->spinlock, flags); | |
6819bc2e | 639 | |
1da177e4 LT |
640 | skb = self->tx_skb; |
641 | self->tx_skb = NULL; | |
642 | ||
643 | spin_unlock_irqrestore(&self->spinlock, flags); | |
644 | ||
645 | /* Flush transmit buffer if any */ | |
646 | if (skb) { | |
647 | ircomm_tty_do_event(self, IRCOMM_TTY_DATA_REQUEST, skb, NULL); | |
648 | /* Drop reference count - see ircomm_ttp_data_request(). */ | |
649 | dev_kfree_skb(skb); | |
650 | } | |
6819bc2e | 651 | |
1da177e4 | 652 | /* Check if user (still) wants to be waken up */ |
a352def2 | 653 | tty_wakeup(tty); |
1da177e4 LT |
654 | } |
655 | ||
656 | /* | |
657 | * Function ircomm_tty_write (tty, buf, count) | |
658 | * | |
659 | * This routine is called by the kernel to write a series of characters | |
660 | * to the tty device. The characters may come from user space or kernel | |
661 | * space. This routine will return the number of characters actually | |
662 | * accepted for writing. This routine is mandatory. | |
663 | */ | |
664 | static int ircomm_tty_write(struct tty_struct *tty, | |
665 | const unsigned char *buf, int count) | |
666 | { | |
667 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
668 | unsigned long flags; | |
669 | struct sk_buff *skb; | |
670 | int tailroom = 0; | |
671 | int len = 0; | |
672 | int size; | |
673 | ||
0dc47877 | 674 | IRDA_DEBUG(2, "%s(), count=%d, hw_stopped=%d\n", __func__ , count, |
1da177e4 LT |
675 | tty->hw_stopped); |
676 | ||
677 | IRDA_ASSERT(self != NULL, return -1;); | |
678 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
679 | ||
680 | /* We may receive packets from the TTY even before we have finished | |
681 | * our setup. Not cool. | |
682 | * The problem is that we don't know the final header and data size | |
683 | * to create the proper skb, so any skb we would create would have | |
684 | * bogus header and data size, so need care. | |
685 | * We use a bogus header size to safely detect this condition. | |
686 | * Another problem is that hw_stopped was set to 0 way before it | |
687 | * should be, so we would drop this skb. It should now be fixed. | |
688 | * One option is to not accept data until we are properly setup. | |
689 | * But, I suspect that when it happens, the ppp line discipline | |
690 | * just "drops" the data, which might screw up connect scripts. | |
691 | * The second option is to create a "safe skb", with large header | |
692 | * and small size (see ircomm_tty_open() for values). | |
693 | * We just need to make sure that when the real values get filled, | |
694 | * we don't mess up the original "safe skb" (see tx_data_size). | |
695 | * Jean II */ | |
696 | if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) { | |
0dc47877 | 697 | IRDA_DEBUG(1, "%s() : not initialised\n", __func__); |
1da177e4 LT |
698 | #ifdef IRCOMM_NO_TX_BEFORE_INIT |
699 | /* We didn't consume anything, TTY will retry */ | |
700 | return 0; | |
701 | #endif | |
702 | } | |
703 | ||
704 | if (count < 1) | |
705 | return 0; | |
706 | ||
707 | /* Protect our manipulation of self->tx_skb and related */ | |
708 | spin_lock_irqsave(&self->spinlock, flags); | |
709 | ||
710 | /* Fetch current transmit buffer */ | |
711 | skb = self->tx_skb; | |
712 | ||
6819bc2e | 713 | /* |
1da177e4 LT |
714 | * Send out all the data we get, possibly as multiple fragmented |
715 | * frames, but this will only happen if the data is larger than the | |
716 | * max data size. The normal case however is just the opposite, and | |
717 | * this function may be called multiple times, and will then actually | |
6819bc2e | 718 | * defragment the data and send it out as one packet as soon as |
1da177e4 LT |
719 | * possible, but at a safer point in time |
720 | */ | |
721 | while (count) { | |
722 | size = count; | |
723 | ||
724 | /* Adjust data size to the max data size */ | |
725 | if (size > self->max_data_size) | |
726 | size = self->max_data_size; | |
6819bc2e YH |
727 | |
728 | /* | |
1da177e4 | 729 | * Do we already have a buffer ready for transmit, or do |
6819bc2e | 730 | * we need to allocate a new frame |
1da177e4 | 731 | */ |
6819bc2e YH |
732 | if (skb) { |
733 | /* | |
734 | * Any room for more data at the end of the current | |
1da177e4 | 735 | * transmit buffer? Cannot use skb_tailroom, since |
6819bc2e | 736 | * dev_alloc_skb gives us a larger skb than we |
1da177e4 LT |
737 | * requested |
738 | * Note : use tx_data_size, because max_data_size | |
739 | * may have changed and we don't want to overwrite | |
740 | * the skb. - Jean II | |
741 | */ | |
742 | if ((tailroom = (self->tx_data_size - skb->len)) > 0) { | |
743 | /* Adjust data to tailroom */ | |
744 | if (size > tailroom) | |
745 | size = tailroom; | |
746 | } else { | |
6819bc2e YH |
747 | /* |
748 | * Current transmit frame is full, so break | |
1da177e4 LT |
749 | * out, so we can send it as soon as possible |
750 | */ | |
751 | break; | |
752 | } | |
753 | } else { | |
754 | /* Prepare a full sized frame */ | |
485fb2c9 SO |
755 | skb = alloc_skb(self->max_data_size+ |
756 | self->max_header_size, | |
757 | GFP_ATOMIC); | |
1da177e4 LT |
758 | if (!skb) { |
759 | spin_unlock_irqrestore(&self->spinlock, flags); | |
760 | return -ENOBUFS; | |
761 | } | |
762 | skb_reserve(skb, self->max_header_size); | |
763 | self->tx_skb = skb; | |
764 | /* Remember skb size because max_data_size may | |
765 | * change later on - Jean II */ | |
766 | self->tx_data_size = self->max_data_size; | |
767 | } | |
768 | ||
769 | /* Copy data */ | |
770 | memcpy(skb_put(skb,size), buf + len, size); | |
771 | ||
772 | count -= size; | |
773 | len += size; | |
774 | } | |
775 | ||
776 | spin_unlock_irqrestore(&self->spinlock, flags); | |
777 | ||
6819bc2e | 778 | /* |
1da177e4 LT |
779 | * Schedule a new thread which will transmit the frame as soon |
780 | * as possible, but at a safe point in time. We do this so the | |
781 | * "user" can give us data multiple times, as PPP does (because of | |
782 | * its 256 byte tx buffer). We will then defragment and send out | |
6819bc2e | 783 | * all this data as one single packet. |
1da177e4 LT |
784 | */ |
785 | schedule_work(&self->tqueue); | |
6819bc2e | 786 | |
1da177e4 LT |
787 | return len; |
788 | } | |
789 | ||
790 | /* | |
791 | * Function ircomm_tty_write_room (tty) | |
792 | * | |
793 | * This routine returns the numbers of characters the tty driver will | |
794 | * accept for queuing to be written. This number is subject to change as | |
795 | * output buffers get emptied, or if the output flow control is acted. | |
796 | */ | |
797 | static int ircomm_tty_write_room(struct tty_struct *tty) | |
798 | { | |
799 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
800 | unsigned long flags; | |
801 | int ret; | |
802 | ||
803 | IRDA_ASSERT(self != NULL, return -1;); | |
804 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
805 | ||
806 | #ifdef IRCOMM_NO_TX_BEFORE_INIT | |
807 | /* max_header_size tells us if the channel is initialised or not. */ | |
808 | if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) | |
809 | /* Don't bother us yet */ | |
810 | return 0; | |
811 | #endif | |
812 | ||
813 | /* Check if we are allowed to transmit any data. | |
814 | * hw_stopped is the regular flow control. | |
815 | * Jean II */ | |
816 | if (tty->hw_stopped) | |
817 | ret = 0; | |
818 | else { | |
819 | spin_lock_irqsave(&self->spinlock, flags); | |
820 | if (self->tx_skb) | |
821 | ret = self->tx_data_size - self->tx_skb->len; | |
822 | else | |
823 | ret = self->max_data_size; | |
824 | spin_unlock_irqrestore(&self->spinlock, flags); | |
825 | } | |
0dc47877 | 826 | IRDA_DEBUG(2, "%s(), ret=%d\n", __func__ , ret); |
1da177e4 LT |
827 | |
828 | return ret; | |
829 | } | |
830 | ||
831 | /* | |
832 | * Function ircomm_tty_wait_until_sent (tty, timeout) | |
833 | * | |
834 | * This routine waits until the device has written out all of the | |
835 | * characters in its transmitter FIFO. | |
836 | */ | |
837 | static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout) | |
838 | { | |
839 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
840 | unsigned long orig_jiffies, poll_time; | |
841 | unsigned long flags; | |
6819bc2e | 842 | |
0dc47877 | 843 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 LT |
844 | |
845 | IRDA_ASSERT(self != NULL, return;); | |
846 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
847 | ||
848 | orig_jiffies = jiffies; | |
849 | ||
850 | /* Set poll time to 200 ms */ | |
851 | poll_time = IRDA_MIN(timeout, msecs_to_jiffies(200)); | |
852 | ||
853 | spin_lock_irqsave(&self->spinlock, flags); | |
854 | while (self->tx_skb && self->tx_skb->len) { | |
855 | spin_unlock_irqrestore(&self->spinlock, flags); | |
121caf57 | 856 | schedule_timeout_interruptible(poll_time); |
1da177e4 LT |
857 | spin_lock_irqsave(&self->spinlock, flags); |
858 | if (signal_pending(current)) | |
859 | break; | |
860 | if (timeout && time_after(jiffies, orig_jiffies + timeout)) | |
861 | break; | |
862 | } | |
863 | spin_unlock_irqrestore(&self->spinlock, flags); | |
864 | current->state = TASK_RUNNING; | |
865 | } | |
866 | ||
867 | /* | |
868 | * Function ircomm_tty_throttle (tty) | |
869 | * | |
870 | * This routine notifies the tty driver that input buffers for the line | |
871 | * discipline are close to full, and it should somehow signal that no | |
6819bc2e | 872 | * more characters should be sent to the tty. |
1da177e4 LT |
873 | */ |
874 | static void ircomm_tty_throttle(struct tty_struct *tty) | |
875 | { | |
876 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
877 | ||
0dc47877 | 878 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 LT |
879 | |
880 | IRDA_ASSERT(self != NULL, return;); | |
881 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
882 | ||
883 | /* Software flow control? */ | |
884 | if (I_IXOFF(tty)) | |
885 | ircomm_tty_send_xchar(tty, STOP_CHAR(tty)); | |
6819bc2e | 886 | |
1da177e4 LT |
887 | /* Hardware flow control? */ |
888 | if (tty->termios->c_cflag & CRTSCTS) { | |
889 | self->settings.dte &= ~IRCOMM_RTS; | |
890 | self->settings.dte |= IRCOMM_DELTA_RTS; | |
6819bc2e | 891 | |
1da177e4 LT |
892 | ircomm_param_request(self, IRCOMM_DTE, TRUE); |
893 | } | |
894 | ||
6819bc2e | 895 | ircomm_flow_request(self->ircomm, FLOW_STOP); |
1da177e4 LT |
896 | } |
897 | ||
898 | /* | |
899 | * Function ircomm_tty_unthrottle (tty) | |
900 | * | |
901 | * This routine notifies the tty drivers that it should signals that | |
902 | * characters can now be sent to the tty without fear of overrunning the | |
903 | * input buffers of the line disciplines. | |
904 | */ | |
905 | static void ircomm_tty_unthrottle(struct tty_struct *tty) | |
906 | { | |
907 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
908 | ||
0dc47877 | 909 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 LT |
910 | |
911 | IRDA_ASSERT(self != NULL, return;); | |
912 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
913 | ||
914 | /* Using software flow control? */ | |
915 | if (I_IXOFF(tty)) { | |
916 | ircomm_tty_send_xchar(tty, START_CHAR(tty)); | |
917 | } | |
918 | ||
919 | /* Using hardware flow control? */ | |
920 | if (tty->termios->c_cflag & CRTSCTS) { | |
921 | self->settings.dte |= (IRCOMM_RTS|IRCOMM_DELTA_RTS); | |
922 | ||
923 | ircomm_param_request(self, IRCOMM_DTE, TRUE); | |
0dc47877 | 924 | IRDA_DEBUG(1, "%s(), FLOW_START\n", __func__ ); |
1da177e4 | 925 | } |
6819bc2e | 926 | ircomm_flow_request(self->ircomm, FLOW_START); |
1da177e4 LT |
927 | } |
928 | ||
929 | /* | |
930 | * Function ircomm_tty_chars_in_buffer (tty) | |
931 | * | |
932 | * Indicates if there are any data in the buffer | |
933 | * | |
934 | */ | |
935 | static int ircomm_tty_chars_in_buffer(struct tty_struct *tty) | |
936 | { | |
937 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
938 | unsigned long flags; | |
939 | int len = 0; | |
940 | ||
941 | IRDA_ASSERT(self != NULL, return -1;); | |
942 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
943 | ||
944 | spin_lock_irqsave(&self->spinlock, flags); | |
945 | ||
946 | if (self->tx_skb) | |
947 | len = self->tx_skb->len; | |
948 | ||
949 | spin_unlock_irqrestore(&self->spinlock, flags); | |
950 | ||
951 | return len; | |
952 | } | |
953 | ||
954 | static void ircomm_tty_shutdown(struct ircomm_tty_cb *self) | |
955 | { | |
956 | unsigned long flags; | |
957 | ||
958 | IRDA_ASSERT(self != NULL, return;); | |
959 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
960 | ||
0dc47877 | 961 | IRDA_DEBUG(0, "%s()\n", __func__ ); |
1da177e4 LT |
962 | |
963 | if (!test_and_clear_bit(ASYNC_B_INITIALIZED, &self->flags)) | |
964 | return; | |
965 | ||
966 | ircomm_tty_detach_cable(self); | |
967 | ||
968 | spin_lock_irqsave(&self->spinlock, flags); | |
969 | ||
970 | del_timer(&self->watchdog_timer); | |
6819bc2e | 971 | |
1da177e4 LT |
972 | /* Free parameter buffer */ |
973 | if (self->ctrl_skb) { | |
974 | dev_kfree_skb(self->ctrl_skb); | |
975 | self->ctrl_skb = NULL; | |
976 | } | |
977 | ||
978 | /* Free transmit buffer */ | |
979 | if (self->tx_skb) { | |
980 | dev_kfree_skb(self->tx_skb); | |
981 | self->tx_skb = NULL; | |
982 | } | |
983 | ||
984 | if (self->ircomm) { | |
985 | ircomm_close(self->ircomm); | |
986 | self->ircomm = NULL; | |
987 | } | |
988 | ||
989 | spin_unlock_irqrestore(&self->spinlock, flags); | |
990 | } | |
991 | ||
992 | /* | |
993 | * Function ircomm_tty_hangup (tty) | |
994 | * | |
995 | * This routine notifies the tty driver that it should hangup the tty | |
996 | * device. | |
6819bc2e | 997 | * |
1da177e4 LT |
998 | */ |
999 | static void ircomm_tty_hangup(struct tty_struct *tty) | |
1000 | { | |
1001 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
1002 | unsigned long flags; | |
1003 | ||
0dc47877 | 1004 | IRDA_DEBUG(0, "%s()\n", __func__ ); |
1da177e4 LT |
1005 | |
1006 | IRDA_ASSERT(self != NULL, return;); | |
1007 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
1008 | ||
1da177e4 LT |
1009 | /* ircomm_tty_flush_buffer(tty); */ |
1010 | ircomm_tty_shutdown(self); | |
1011 | ||
1012 | /* I guess we need to lock here - Jean II */ | |
1013 | spin_lock_irqsave(&self->spinlock, flags); | |
1014 | self->flags &= ~ASYNC_NORMAL_ACTIVE; | |
1015 | self->tty = NULL; | |
1016 | self->open_count = 0; | |
1017 | spin_unlock_irqrestore(&self->spinlock, flags); | |
1018 | ||
1019 | wake_up_interruptible(&self->open_wait); | |
1020 | } | |
1021 | ||
1022 | /* | |
1023 | * Function ircomm_tty_send_xchar (tty, ch) | |
1024 | * | |
1025 | * This routine is used to send a high-priority XON/XOFF character to | |
1026 | * the device. | |
1027 | */ | |
1028 | static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch) | |
1029 | { | |
0dc47877 | 1030 | IRDA_DEBUG(0, "%s(), not impl\n", __func__ ); |
1da177e4 LT |
1031 | } |
1032 | ||
1033 | /* | |
1034 | * Function ircomm_tty_start (tty) | |
1035 | * | |
1036 | * This routine notifies the tty driver that it resume sending | |
6819bc2e | 1037 | * characters to the tty device. |
1da177e4 LT |
1038 | */ |
1039 | void ircomm_tty_start(struct tty_struct *tty) | |
1040 | { | |
1041 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
1042 | ||
1043 | ircomm_flow_request(self->ircomm, FLOW_START); | |
1044 | } | |
1045 | ||
1046 | /* | |
1047 | * Function ircomm_tty_stop (tty) | |
1048 | * | |
1049 | * This routine notifies the tty driver that it should stop outputting | |
6819bc2e | 1050 | * characters to the tty device. |
1da177e4 | 1051 | */ |
6819bc2e | 1052 | static void ircomm_tty_stop(struct tty_struct *tty) |
1da177e4 LT |
1053 | { |
1054 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
1055 | ||
1056 | IRDA_ASSERT(self != NULL, return;); | |
1057 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
1058 | ||
1059 | ircomm_flow_request(self->ircomm, FLOW_STOP); | |
1060 | } | |
1061 | ||
1062 | /* | |
1063 | * Function ircomm_check_modem_status (self) | |
1064 | * | |
1065 | * Check for any changes in the DCE's line settings. This function should | |
1066 | * be called whenever the dce parameter settings changes, to update the | |
1067 | * flow control settings and other things | |
1068 | */ | |
1069 | void ircomm_tty_check_modem_status(struct ircomm_tty_cb *self) | |
1070 | { | |
1071 | struct tty_struct *tty; | |
1072 | int status; | |
1073 | ||
0dc47877 | 1074 | IRDA_DEBUG(0, "%s()\n", __func__ ); |
1da177e4 LT |
1075 | |
1076 | IRDA_ASSERT(self != NULL, return;); | |
1077 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
1078 | ||
1079 | tty = self->tty; | |
1080 | ||
1081 | status = self->settings.dce; | |
1082 | ||
1083 | if (status & IRCOMM_DCE_DELTA_ANY) { | |
1084 | /*wake_up_interruptible(&self->delta_msr_wait);*/ | |
1085 | } | |
1086 | if ((self->flags & ASYNC_CHECK_CD) && (status & IRCOMM_DELTA_CD)) { | |
6819bc2e | 1087 | IRDA_DEBUG(2, |
0dc47877 | 1088 | "%s(), ircomm%d CD now %s...\n", __func__ , self->line, |
1da177e4 LT |
1089 | (status & IRCOMM_CD) ? "on" : "off"); |
1090 | ||
1091 | if (status & IRCOMM_CD) { | |
1092 | wake_up_interruptible(&self->open_wait); | |
1093 | } else { | |
6819bc2e | 1094 | IRDA_DEBUG(2, |
0dc47877 | 1095 | "%s(), Doing serial hangup..\n", __func__ ); |
1da177e4 LT |
1096 | if (tty) |
1097 | tty_hangup(tty); | |
1098 | ||
1099 | /* Hangup will remote the tty, so better break out */ | |
1100 | return; | |
1101 | } | |
1102 | } | |
1103 | if (self->flags & ASYNC_CTS_FLOW) { | |
1104 | if (tty->hw_stopped) { | |
1105 | if (status & IRCOMM_CTS) { | |
6819bc2e | 1106 | IRDA_DEBUG(2, |
0dc47877 | 1107 | "%s(), CTS tx start...\n", __func__ ); |
1da177e4 | 1108 | tty->hw_stopped = 0; |
6819bc2e | 1109 | |
1da177e4 LT |
1110 | /* Wake up processes blocked on open */ |
1111 | wake_up_interruptible(&self->open_wait); | |
1112 | ||
1113 | schedule_work(&self->tqueue); | |
1114 | return; | |
1115 | } | |
1116 | } else { | |
1117 | if (!(status & IRCOMM_CTS)) { | |
6819bc2e | 1118 | IRDA_DEBUG(2, |
0dc47877 | 1119 | "%s(), CTS tx stop...\n", __func__ ); |
1da177e4 LT |
1120 | tty->hw_stopped = 1; |
1121 | } | |
1122 | } | |
1123 | } | |
1124 | } | |
1125 | ||
1126 | /* | |
1127 | * Function ircomm_tty_data_indication (instance, sap, skb) | |
1128 | * | |
1129 | * Handle incoming data, and deliver it to the line discipline | |
1130 | * | |
1131 | */ | |
1132 | static int ircomm_tty_data_indication(void *instance, void *sap, | |
1133 | struct sk_buff *skb) | |
1134 | { | |
1135 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; | |
1136 | ||
0dc47877 | 1137 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
6819bc2e | 1138 | |
1da177e4 LT |
1139 | IRDA_ASSERT(self != NULL, return -1;); |
1140 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
1141 | IRDA_ASSERT(skb != NULL, return -1;); | |
1142 | ||
1143 | if (!self->tty) { | |
0dc47877 | 1144 | IRDA_DEBUG(0, "%s(), no tty!\n", __func__ ); |
1da177e4 LT |
1145 | return 0; |
1146 | } | |
1147 | ||
6819bc2e | 1148 | /* |
1da177e4 LT |
1149 | * If we receive data when hardware is stopped then something is wrong. |
1150 | * We try to poll the peers line settings to check if we are up todate. | |
6819bc2e | 1151 | * Devices like WinCE can do this, and since they don't send any |
1da177e4 LT |
1152 | * params, we can just as well declare the hardware for running. |
1153 | */ | |
1154 | if (self->tty->hw_stopped && (self->flow == FLOW_START)) { | |
0dc47877 | 1155 | IRDA_DEBUG(0, "%s(), polling for line settings!\n", __func__ ); |
1da177e4 LT |
1156 | ircomm_param_request(self, IRCOMM_POLL, TRUE); |
1157 | ||
1158 | /* We can just as well declare the hardware for running */ | |
1159 | ircomm_tty_send_initial_parameters(self); | |
1160 | ircomm_tty_link_established(self); | |
1161 | } | |
1162 | ||
6819bc2e | 1163 | /* |
cbfd1526 AV |
1164 | * Use flip buffer functions since the code may be called from interrupt |
1165 | * context | |
1da177e4 | 1166 | */ |
cbfd1526 AV |
1167 | tty_insert_flip_string(self->tty, skb->data, skb->len); |
1168 | tty_flip_buffer_push(self->tty); | |
1da177e4 LT |
1169 | |
1170 | /* No need to kfree_skb - see ircomm_ttp_data_indication() */ | |
1171 | ||
1172 | return 0; | |
1173 | } | |
1174 | ||
1175 | /* | |
1176 | * Function ircomm_tty_control_indication (instance, sap, skb) | |
1177 | * | |
1178 | * Parse all incoming parameters (easy!) | |
1179 | * | |
1180 | */ | |
1181 | static int ircomm_tty_control_indication(void *instance, void *sap, | |
1182 | struct sk_buff *skb) | |
1183 | { | |
1184 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; | |
1185 | int clen; | |
1186 | ||
0dc47877 | 1187 | IRDA_DEBUG(4, "%s()\n", __func__ ); |
6819bc2e | 1188 | |
1da177e4 LT |
1189 | IRDA_ASSERT(self != NULL, return -1;); |
1190 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
1191 | IRDA_ASSERT(skb != NULL, return -1;); | |
1192 | ||
1193 | clen = skb->data[0]; | |
1194 | ||
6819bc2e | 1195 | irda_param_extract_all(self, skb->data+1, IRDA_MIN(skb->len-1, clen), |
1da177e4 LT |
1196 | &ircomm_param_info); |
1197 | ||
1198 | /* No need to kfree_skb - see ircomm_control_indication() */ | |
1199 | ||
1200 | return 0; | |
1201 | } | |
1202 | ||
1203 | /* | |
1204 | * Function ircomm_tty_flow_indication (instance, sap, cmd) | |
1205 | * | |
1206 | * This function is called by IrTTP when it wants us to slow down the | |
1207 | * transmission of data. We just mark the hardware as stopped, and wait | |
1208 | * for IrTTP to notify us that things are OK again. | |
1209 | */ | |
6819bc2e | 1210 | static void ircomm_tty_flow_indication(void *instance, void *sap, |
1da177e4 LT |
1211 | LOCAL_FLOW cmd) |
1212 | { | |
1213 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; | |
1214 | struct tty_struct *tty; | |
1215 | ||
1216 | IRDA_ASSERT(self != NULL, return;); | |
1217 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
1218 | ||
1219 | tty = self->tty; | |
1220 | ||
1221 | switch (cmd) { | |
1222 | case FLOW_START: | |
0dc47877 | 1223 | IRDA_DEBUG(2, "%s(), hw start!\n", __func__ ); |
1da177e4 LT |
1224 | tty->hw_stopped = 0; |
1225 | ||
1226 | /* ircomm_tty_do_softint will take care of the rest */ | |
1227 | schedule_work(&self->tqueue); | |
1228 | break; | |
1229 | default: /* If we get here, something is very wrong, better stop */ | |
1230 | case FLOW_STOP: | |
0dc47877 | 1231 | IRDA_DEBUG(2, "%s(), hw stopped!\n", __func__ ); |
1da177e4 LT |
1232 | tty->hw_stopped = 1; |
1233 | break; | |
1234 | } | |
1235 | self->flow = cmd; | |
1236 | } | |
1237 | ||
92b05e13 | 1238 | #ifdef CONFIG_PROC_FS |
3d304176 | 1239 | static void ircomm_tty_line_info(struct ircomm_tty_cb *self, struct seq_file *m) |
1da177e4 | 1240 | { |
3d304176 | 1241 | char sep; |
1da177e4 | 1242 | |
3d304176 | 1243 | seq_printf(m, "State: %s\n", ircomm_tty_state[self->state]); |
1da177e4 | 1244 | |
3d304176 | 1245 | seq_puts(m, "Service type: "); |
1da177e4 | 1246 | if (self->service_type & IRCOMM_9_WIRE) |
3d304176 | 1247 | seq_puts(m, "9_WIRE"); |
1da177e4 | 1248 | else if (self->service_type & IRCOMM_3_WIRE) |
3d304176 | 1249 | seq_puts(m, "3_WIRE"); |
1da177e4 | 1250 | else if (self->service_type & IRCOMM_3_WIRE_RAW) |
3d304176 | 1251 | seq_puts(m, "3_WIRE_RAW"); |
1da177e4 | 1252 | else |
3d304176 AD |
1253 | seq_puts(m, "No common service type!\n"); |
1254 | seq_putc(m, '\n'); | |
1255 | ||
1256 | seq_printf(m, "Port name: %s\n", self->settings.port_name); | |
1257 | ||
1258 | seq_printf(m, "DTE status:"); | |
1259 | sep = ' '; | |
1260 | if (self->settings.dte & IRCOMM_RTS) { | |
1261 | seq_printf(m, "%cRTS", sep); | |
1262 | sep = '|'; | |
1263 | } | |
1264 | if (self->settings.dte & IRCOMM_DTR) { | |
1265 | seq_printf(m, "%cDTR", sep); | |
1266 | sep = '|'; | |
1267 | } | |
1268 | seq_putc(m, '\n'); | |
1269 | ||
1270 | seq_puts(m, "DCE status:"); | |
1271 | sep = ' '; | |
1272 | if (self->settings.dce & IRCOMM_CTS) { | |
1273 | seq_printf(m, "%cCTS", sep); | |
1274 | sep = '|'; | |
1275 | } | |
1276 | if (self->settings.dce & IRCOMM_DSR) { | |
1277 | seq_printf(m, "%cDSR", sep); | |
1278 | sep = '|'; | |
1279 | } | |
1280 | if (self->settings.dce & IRCOMM_CD) { | |
1281 | seq_printf(m, "%cCD", sep); | |
1282 | sep = '|'; | |
1283 | } | |
1284 | if (self->settings.dce & IRCOMM_RI) { | |
1285 | seq_printf(m, "%cRI", sep); | |
1286 | sep = '|'; | |
1287 | } | |
1288 | seq_putc(m, '\n'); | |
1289 | ||
1290 | seq_puts(m, "Configuration: "); | |
1da177e4 | 1291 | if (!self->settings.null_modem) |
3d304176 | 1292 | seq_puts(m, "DTE <-> DCE\n"); |
1da177e4 | 1293 | else |
3d304176 AD |
1294 | seq_puts(m, "DTE <-> DTE (null modem emulation)\n"); |
1295 | ||
1296 | seq_printf(m, "Data rate: %d\n", self->settings.data_rate); | |
1297 | ||
1298 | seq_puts(m, "Flow control:"); | |
1299 | sep = ' '; | |
1300 | if (self->settings.flow_control & IRCOMM_XON_XOFF_IN) { | |
1301 | seq_printf(m, "%cXON_XOFF_IN", sep); | |
1302 | sep = '|'; | |
1303 | } | |
1304 | if (self->settings.flow_control & IRCOMM_XON_XOFF_OUT) { | |
1305 | seq_printf(m, "%cXON_XOFF_OUT", sep); | |
1306 | sep = '|'; | |
1307 | } | |
1308 | if (self->settings.flow_control & IRCOMM_RTS_CTS_IN) { | |
1309 | seq_printf(m, "%cRTS_CTS_IN", sep); | |
1310 | sep = '|'; | |
1311 | } | |
1312 | if (self->settings.flow_control & IRCOMM_RTS_CTS_OUT) { | |
1313 | seq_printf(m, "%cRTS_CTS_OUT", sep); | |
1314 | sep = '|'; | |
1315 | } | |
1316 | if (self->settings.flow_control & IRCOMM_DSR_DTR_IN) { | |
1317 | seq_printf(m, "%cDSR_DTR_IN", sep); | |
1318 | sep = '|'; | |
1319 | } | |
1320 | if (self->settings.flow_control & IRCOMM_DSR_DTR_OUT) { | |
1321 | seq_printf(m, "%cDSR_DTR_OUT", sep); | |
1322 | sep = '|'; | |
1323 | } | |
1324 | if (self->settings.flow_control & IRCOMM_ENQ_ACK_IN) { | |
1325 | seq_printf(m, "%cENQ_ACK_IN", sep); | |
1326 | sep = '|'; | |
1327 | } | |
1328 | if (self->settings.flow_control & IRCOMM_ENQ_ACK_OUT) { | |
1329 | seq_printf(m, "%cENQ_ACK_OUT", sep); | |
1330 | sep = '|'; | |
1331 | } | |
1332 | seq_putc(m, '\n'); | |
1333 | ||
1334 | seq_puts(m, "Flags:"); | |
1335 | sep = ' '; | |
1336 | if (self->flags & ASYNC_CTS_FLOW) { | |
1337 | seq_printf(m, "%cASYNC_CTS_FLOW", sep); | |
1338 | sep = '|'; | |
1339 | } | |
1340 | if (self->flags & ASYNC_CHECK_CD) { | |
1341 | seq_printf(m, "%cASYNC_CHECK_CD", sep); | |
1342 | sep = '|'; | |
1343 | } | |
1344 | if (self->flags & ASYNC_INITIALIZED) { | |
1345 | seq_printf(m, "%cASYNC_INITIALIZED", sep); | |
1346 | sep = '|'; | |
1347 | } | |
1348 | if (self->flags & ASYNC_LOW_LATENCY) { | |
1349 | seq_printf(m, "%cASYNC_LOW_LATENCY", sep); | |
1350 | sep = '|'; | |
1351 | } | |
1352 | if (self->flags & ASYNC_CLOSING) { | |
1353 | seq_printf(m, "%cASYNC_CLOSING", sep); | |
1354 | sep = '|'; | |
1355 | } | |
1356 | if (self->flags & ASYNC_NORMAL_ACTIVE) { | |
1357 | seq_printf(m, "%cASYNC_NORMAL_ACTIVE", sep); | |
1358 | sep = '|'; | |
1359 | } | |
1360 | seq_putc(m, '\n'); | |
1361 | ||
1362 | seq_printf(m, "Role: %s\n", self->client ? "client" : "server"); | |
1363 | seq_printf(m, "Open count: %d\n", self->open_count); | |
1364 | seq_printf(m, "Max data size: %d\n", self->max_data_size); | |
1365 | seq_printf(m, "Max header size: %d\n", self->max_header_size); | |
6819bc2e | 1366 | |
1da177e4 | 1367 | if (self->tty) |
3d304176 | 1368 | seq_printf(m, "Hardware: %s\n", |
1da177e4 | 1369 | self->tty->hw_stopped ? "Stopped" : "Running"); |
1da177e4 LT |
1370 | } |
1371 | ||
3d304176 | 1372 | static int ircomm_tty_proc_show(struct seq_file *m, void *v) |
1da177e4 LT |
1373 | { |
1374 | struct ircomm_tty_cb *self; | |
1da177e4 LT |
1375 | unsigned long flags; |
1376 | ||
1377 | spin_lock_irqsave(&ircomm_tty->hb_spinlock, flags); | |
1378 | ||
1379 | self = (struct ircomm_tty_cb *) hashbin_get_first(ircomm_tty); | |
3d304176 | 1380 | while (self != NULL) { |
1da177e4 LT |
1381 | if (self->magic != IRCOMM_TTY_MAGIC) |
1382 | break; | |
1383 | ||
3d304176 | 1384 | ircomm_tty_line_info(self, m); |
1da177e4 | 1385 | self = (struct ircomm_tty_cb *) hashbin_get_next(ircomm_tty); |
6819bc2e | 1386 | } |
1da177e4 | 1387 | spin_unlock_irqrestore(&ircomm_tty->hb_spinlock, flags); |
3d304176 AD |
1388 | return 0; |
1389 | } | |
1da177e4 | 1390 | |
3d304176 AD |
1391 | static int ircomm_tty_proc_open(struct inode *inode, struct file *file) |
1392 | { | |
1393 | return single_open(file, ircomm_tty_proc_show, NULL); | |
1da177e4 | 1394 | } |
3d304176 AD |
1395 | |
1396 | static const struct file_operations ircomm_tty_proc_fops = { | |
1397 | .owner = THIS_MODULE, | |
1398 | .open = ircomm_tty_proc_open, | |
1399 | .read = seq_read, | |
1400 | .llseek = seq_lseek, | |
1401 | .release = single_release, | |
1402 | }; | |
1da177e4 LT |
1403 | #endif /* CONFIG_PROC_FS */ |
1404 | ||
1405 | MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>"); | |
1406 | MODULE_DESCRIPTION("IrCOMM serial TTY driver"); | |
1407 | MODULE_LICENSE("GPL"); | |
1408 | MODULE_ALIAS_CHARDEV_MAJOR(IRCOMM_TTY_MAJOR); | |
1409 | ||
1410 | module_init(ircomm_tty_init); | |
1411 | module_exit(ircomm_tty_cleanup); |