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 | ||
1da177e4 LT |
125 | driver->driver_name = "ircomm"; |
126 | driver->name = "ircomm"; | |
1da177e4 LT |
127 | driver->major = IRCOMM_TTY_MAJOR; |
128 | driver->minor_start = IRCOMM_TTY_MINOR; | |
129 | driver->type = TTY_DRIVER_TYPE_SERIAL; | |
130 | driver->subtype = SERIAL_TYPE_NORMAL; | |
131 | driver->init_termios = tty_std_termios; | |
132 | driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; | |
133 | driver->flags = TTY_DRIVER_REAL_RAW; | |
134 | tty_set_operations(driver, &ops); | |
135 | if (tty_register_driver(driver)) { | |
136 | IRDA_ERROR("%s(): Couldn't register serial driver\n", | |
0dc47877 | 137 | __func__); |
1da177e4 LT |
138 | put_tty_driver(driver); |
139 | return -1; | |
140 | } | |
141 | return 0; | |
142 | } | |
143 | ||
144 | static void __exit __ircomm_tty_cleanup(struct ircomm_tty_cb *self) | |
145 | { | |
0dc47877 | 146 | IRDA_DEBUG(0, "%s()\n", __func__ ); |
1da177e4 LT |
147 | |
148 | IRDA_ASSERT(self != NULL, return;); | |
149 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
150 | ||
151 | ircomm_tty_shutdown(self); | |
152 | ||
153 | self->magic = 0; | |
154 | kfree(self); | |
155 | } | |
156 | ||
157 | /* | |
158 | * Function ircomm_tty_cleanup () | |
159 | * | |
160 | * Remove IrCOMM TTY layer/driver | |
161 | * | |
162 | */ | |
163 | static void __exit ircomm_tty_cleanup(void) | |
164 | { | |
165 | int ret; | |
166 | ||
0dc47877 | 167 | IRDA_DEBUG(4, "%s()\n", __func__ ); |
1da177e4 LT |
168 | |
169 | ret = tty_unregister_driver(driver); | |
6819bc2e YH |
170 | if (ret) { |
171 | IRDA_ERROR("%s(), failed to unregister driver\n", | |
0dc47877 | 172 | __func__); |
1da177e4 LT |
173 | return; |
174 | } | |
175 | ||
176 | hashbin_delete(ircomm_tty, (FREE_FUNC) __ircomm_tty_cleanup); | |
177 | put_tty_driver(driver); | |
178 | } | |
179 | ||
180 | /* | |
181 | * Function ircomm_startup (self) | |
182 | * | |
6819bc2e | 183 | * |
1da177e4 LT |
184 | * |
185 | */ | |
186 | static int ircomm_tty_startup(struct ircomm_tty_cb *self) | |
187 | { | |
188 | notify_t notify; | |
189 | int ret = -ENODEV; | |
190 | ||
0dc47877 | 191 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 LT |
192 | |
193 | IRDA_ASSERT(self != NULL, return -1;); | |
194 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
195 | ||
196 | /* Check if already open */ | |
849d5a99 | 197 | if (test_and_set_bit(ASYNCB_INITIALIZED, &self->port.flags)) { |
0dc47877 | 198 | IRDA_DEBUG(2, "%s(), already open so break out!\n", __func__ ); |
1da177e4 LT |
199 | return 0; |
200 | } | |
201 | ||
202 | /* Register with IrCOMM */ | |
203 | irda_notify_init(¬ify); | |
204 | /* These callbacks we must handle ourselves */ | |
205 | notify.data_indication = ircomm_tty_data_indication; | |
206 | notify.udata_indication = ircomm_tty_control_indication; | |
6819bc2e | 207 | notify.flow_indication = ircomm_tty_flow_indication; |
1da177e4 LT |
208 | |
209 | /* Use the ircomm_tty interface for these ones */ | |
6819bc2e | 210 | notify.disconnect_indication = ircomm_tty_disconnect_indication; |
1da177e4 | 211 | notify.connect_confirm = ircomm_tty_connect_confirm; |
6819bc2e | 212 | notify.connect_indication = ircomm_tty_connect_indication; |
1da177e4 LT |
213 | strlcpy(notify.name, "ircomm_tty", sizeof(notify.name)); |
214 | notify.instance = self; | |
215 | ||
216 | if (!self->ircomm) { | |
6819bc2e | 217 | self->ircomm = ircomm_open(¬ify, self->service_type, |
1da177e4 LT |
218 | self->line); |
219 | } | |
220 | if (!self->ircomm) | |
221 | goto err; | |
222 | ||
223 | self->slsap_sel = self->ircomm->slsap_sel; | |
224 | ||
225 | /* Connect IrCOMM link with remote device */ | |
226 | ret = ircomm_tty_attach_cable(self); | |
227 | if (ret < 0) { | |
0dc47877 | 228 | IRDA_ERROR("%s(), error attaching cable!\n", __func__); |
1da177e4 LT |
229 | goto err; |
230 | } | |
231 | ||
232 | return 0; | |
233 | err: | |
849d5a99 | 234 | clear_bit(ASYNCB_INITIALIZED, &self->port.flags); |
1da177e4 LT |
235 | return ret; |
236 | } | |
237 | ||
238 | /* | |
239 | * Function ircomm_block_til_ready (self, filp) | |
240 | * | |
6819bc2e | 241 | * |
1da177e4 LT |
242 | * |
243 | */ | |
6819bc2e | 244 | static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self, |
62f228ac | 245 | struct tty_struct *tty, struct file *filp) |
1da177e4 LT |
246 | { |
247 | DECLARE_WAITQUEUE(wait, current); | |
248 | int retval; | |
249 | int do_clocal = 0, extra_count = 0; | |
250 | unsigned long flags; | |
6819bc2e | 251 | |
0dc47877 | 252 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 | 253 | |
1da177e4 LT |
254 | /* |
255 | * If non-blocking mode is set, or the port is not enabled, | |
256 | * then make the check up front and then exit. | |
6819bc2e | 257 | */ |
1da177e4 LT |
258 | if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){ |
259 | /* nonblock mode is set or port is not enabled */ | |
849d5a99 | 260 | self->port.flags |= ASYNC_NORMAL_ACTIVE; |
0dc47877 | 261 | IRDA_DEBUG(1, "%s(), O_NONBLOCK requested!\n", __func__ ); |
1da177e4 LT |
262 | return 0; |
263 | } | |
264 | ||
265 | if (tty->termios->c_cflag & CLOCAL) { | |
0dc47877 | 266 | IRDA_DEBUG(1, "%s(), doing CLOCAL!\n", __func__ ); |
1da177e4 LT |
267 | do_clocal = 1; |
268 | } | |
6819bc2e | 269 | |
1da177e4 LT |
270 | /* Wait for carrier detect and the line to become |
271 | * free (i.e., not in use by the callout). While we are in | |
580d27b4 | 272 | * this loop, self->port.count is dropped by one, so that |
1da177e4 LT |
273 | * mgsl_close() knows when to free things. We restore it upon |
274 | * exit, either normal or abnormal. | |
275 | */ | |
6819bc2e | 276 | |
1da177e4 | 277 | retval = 0; |
a3cc9fcf | 278 | add_wait_queue(&self->port.open_wait, &wait); |
6819bc2e | 279 | |
1da177e4 | 280 | IRDA_DEBUG(2, "%s(%d):block_til_ready before block on %s open_count=%d\n", |
580d27b4 | 281 | __FILE__, __LINE__, tty->driver->name, self->port.count); |
1da177e4 | 282 | |
e673927d | 283 | spin_lock_irqsave(&self->port.lock, flags); |
1da177e4 LT |
284 | if (!tty_hung_up_p(filp)) { |
285 | extra_count = 1; | |
580d27b4 | 286 | self->port.count--; |
1da177e4 | 287 | } |
e673927d | 288 | spin_unlock_irqrestore(&self->port.lock, flags); |
580d27b4 | 289 | self->port.blocked_open++; |
6819bc2e | 290 | |
1da177e4 LT |
291 | while (1) { |
292 | if (tty->termios->c_cflag & CBAUD) { | |
293 | /* Here, we use to lock those two guys, but | |
294 | * as ircomm_param_request() does it itself, | |
295 | * I don't see the point (and I see the deadlock). | |
296 | * Jean II */ | |
297 | self->settings.dte |= IRCOMM_RTS + IRCOMM_DTR; | |
6819bc2e | 298 | |
1da177e4 LT |
299 | ircomm_param_request(self, IRCOMM_DTE, TRUE); |
300 | } | |
6819bc2e | 301 | |
1da177e4 | 302 | current->state = TASK_INTERRUPTIBLE; |
6819bc2e | 303 | |
1da177e4 | 304 | if (tty_hung_up_p(filp) || |
849d5a99 JS |
305 | !test_bit(ASYNCB_INITIALIZED, &self->port.flags)) { |
306 | retval = (self->port.flags & ASYNC_HUP_NOTIFY) ? | |
1da177e4 LT |
307 | -EAGAIN : -ERESTARTSYS; |
308 | break; | |
309 | } | |
6819bc2e YH |
310 | |
311 | /* | |
1da177e4 LT |
312 | * Check if link is ready now. Even if CLOCAL is |
313 | * specified, we cannot return before the IrCOMM link is | |
6819bc2e | 314 | * ready |
1da177e4 | 315 | */ |
849d5a99 | 316 | if (!test_bit(ASYNCB_CLOSING, &self->port.flags) && |
6819bc2e | 317 | (do_clocal || (self->settings.dce & IRCOMM_CD)) && |
1da177e4 LT |
318 | self->state == IRCOMM_TTY_READY) |
319 | { | |
6819bc2e | 320 | break; |
1da177e4 | 321 | } |
6819bc2e | 322 | |
1da177e4 LT |
323 | if (signal_pending(current)) { |
324 | retval = -ERESTARTSYS; | |
325 | break; | |
326 | } | |
6819bc2e | 327 | |
1da177e4 | 328 | IRDA_DEBUG(1, "%s(%d):block_til_ready blocking on %s open_count=%d\n", |
580d27b4 | 329 | __FILE__, __LINE__, tty->driver->name, self->port.count); |
6819bc2e | 330 | |
1da177e4 LT |
331 | schedule(); |
332 | } | |
6819bc2e | 333 | |
1da177e4 | 334 | __set_current_state(TASK_RUNNING); |
a3cc9fcf | 335 | remove_wait_queue(&self->port.open_wait, &wait); |
6819bc2e | 336 | |
1da177e4 LT |
337 | if (extra_count) { |
338 | /* ++ is not atomic, so this should be protected - Jean II */ | |
e673927d | 339 | spin_lock_irqsave(&self->port.lock, flags); |
580d27b4 | 340 | self->port.count++; |
e673927d | 341 | spin_unlock_irqrestore(&self->port.lock, flags); |
1da177e4 | 342 | } |
580d27b4 | 343 | self->port.blocked_open--; |
6819bc2e | 344 | |
1da177e4 | 345 | IRDA_DEBUG(1, "%s(%d):block_til_ready after blocking on %s open_count=%d\n", |
580d27b4 | 346 | __FILE__, __LINE__, tty->driver->name, self->port.count); |
6819bc2e | 347 | |
1da177e4 | 348 | if (!retval) |
849d5a99 | 349 | self->port.flags |= ASYNC_NORMAL_ACTIVE; |
6819bc2e YH |
350 | |
351 | return retval; | |
1da177e4 LT |
352 | } |
353 | ||
354 | /* | |
355 | * Function ircomm_tty_open (tty, filp) | |
356 | * | |
357 | * This routine is called when a particular tty device is opened. This | |
358 | * routine is mandatory; if this routine is not filled in, the attempted | |
359 | * open will fail with ENODEV. | |
360 | */ | |
361 | static int ircomm_tty_open(struct tty_struct *tty, struct file *filp) | |
362 | { | |
363 | struct ircomm_tty_cb *self; | |
410235fd | 364 | unsigned int line = tty->index; |
1da177e4 LT |
365 | unsigned long flags; |
366 | int ret; | |
367 | ||
0dc47877 | 368 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 | 369 | |
1da177e4 LT |
370 | /* Check if instance already exists */ |
371 | self = hashbin_lock_find(ircomm_tty, line, NULL); | |
372 | if (!self) { | |
373 | /* No, so make new instance */ | |
0da974f4 | 374 | self = kzalloc(sizeof(struct ircomm_tty_cb), GFP_KERNEL); |
1da177e4 | 375 | if (self == NULL) { |
0dc47877 | 376 | IRDA_ERROR("%s(), kmalloc failed!\n", __func__); |
1da177e4 LT |
377 | return -ENOMEM; |
378 | } | |
6819bc2e | 379 | |
a3cc9fcf | 380 | tty_port_init(&self->port); |
1da177e4 LT |
381 | self->magic = IRCOMM_TTY_MAGIC; |
382 | self->flow = FLOW_STOP; | |
383 | ||
384 | self->line = line; | |
c4028958 | 385 | INIT_WORK(&self->tqueue, ircomm_tty_do_softint); |
1da177e4 LT |
386 | self->max_header_size = IRCOMM_TTY_HDR_UNINITIALISED; |
387 | self->max_data_size = IRCOMM_TTY_DATA_UNINITIALISED; | |
1da177e4 LT |
388 | |
389 | /* Init some important stuff */ | |
390 | init_timer(&self->watchdog_timer); | |
1da177e4 LT |
391 | spin_lock_init(&self->spinlock); |
392 | ||
6819bc2e | 393 | /* |
1da177e4 LT |
394 | * Force TTY into raw mode by default which is usually what |
395 | * we want for IrCOMM and IrLPT. This way applications will | |
6819bc2e | 396 | * not have to twiddle with printcap etc. |
ad36b88e AC |
397 | * |
398 | * Note this is completely usafe and doesn't work properly | |
1da177e4 LT |
399 | */ |
400 | tty->termios->c_iflag = 0; | |
401 | tty->termios->c_oflag = 0; | |
402 | ||
403 | /* Insert into hash */ | |
a3cc9fcf | 404 | /* FIXME there is a window from find to here */ |
1da177e4 LT |
405 | hashbin_insert(ircomm_tty, (irda_queue_t *) self, line, NULL); |
406 | } | |
407 | /* ++ is not atomic, so this should be protected - Jean II */ | |
e673927d | 408 | spin_lock_irqsave(&self->port.lock, flags); |
580d27b4 | 409 | self->port.count++; |
1da177e4 LT |
410 | |
411 | tty->driver_data = self; | |
e673927d | 412 | spin_unlock_irqrestore(&self->port.lock, flags); |
62f228ac | 413 | tty_port_tty_set(&self->port, tty); |
1da177e4 | 414 | |
0dc47877 | 415 | IRDA_DEBUG(1, "%s(), %s%d, count = %d\n", __func__ , tty->driver->name, |
580d27b4 | 416 | self->line, self->port.count); |
1da177e4 LT |
417 | |
418 | /* Not really used by us, but lets do it anyway */ | |
849d5a99 | 419 | tty->low_latency = (self->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0; |
1da177e4 LT |
420 | |
421 | /* | |
422 | * If the port is the middle of closing, bail out now | |
423 | */ | |
424 | if (tty_hung_up_p(filp) || | |
849d5a99 | 425 | test_bit(ASYNCB_CLOSING, &self->port.flags)) { |
1da177e4 LT |
426 | |
427 | /* Hm, why are we blocking on ASYNC_CLOSING if we | |
428 | * do return -EAGAIN/-ERESTARTSYS below anyway? | |
429 | * IMHO it's either not needed in the first place | |
430 | * or for some reason we need to make sure the async | |
431 | * closing has been finished - if so, wouldn't we | |
432 | * probably better sleep uninterruptible? | |
433 | */ | |
434 | ||
a3cc9fcf | 435 | if (wait_event_interruptible(self->port.close_wait, |
849d5a99 | 436 | !test_bit(ASYNCB_CLOSING, &self->port.flags))) { |
1da177e4 | 437 | IRDA_WARNING("%s - got signal while blocking on ASYNC_CLOSING!\n", |
0dc47877 | 438 | __func__); |
1da177e4 LT |
439 | return -ERESTARTSYS; |
440 | } | |
441 | ||
442 | #ifdef SERIAL_DO_RESTART | |
849d5a99 | 443 | return (self->port.flags & ASYNC_HUP_NOTIFY) ? |
a02cec21 | 444 | -EAGAIN : -ERESTARTSYS; |
1da177e4 LT |
445 | #else |
446 | return -EAGAIN; | |
447 | #endif | |
448 | } | |
449 | ||
450 | /* Check if this is a "normal" ircomm device, or an irlpt device */ | |
451 | if (line < 0x10) { | |
452 | self->service_type = IRCOMM_3_WIRE | IRCOMM_9_WIRE; | |
453 | self->settings.service_type = IRCOMM_9_WIRE; /* 9 wire as default */ | |
454 | /* Jan Kiszka -> add DSR/RI -> Conform to IrCOMM spec */ | |
455 | self->settings.dce = IRCOMM_CTS | IRCOMM_CD | IRCOMM_DSR | IRCOMM_RI; /* Default line settings */ | |
0dc47877 | 456 | IRDA_DEBUG(2, "%s(), IrCOMM device\n", __func__ ); |
1da177e4 | 457 | } else { |
0dc47877 | 458 | IRDA_DEBUG(2, "%s(), IrLPT device\n", __func__ ); |
1da177e4 LT |
459 | self->service_type = IRCOMM_3_WIRE_RAW; |
460 | self->settings.service_type = IRCOMM_3_WIRE_RAW; /* Default */ | |
461 | } | |
462 | ||
463 | ret = ircomm_tty_startup(self); | |
464 | if (ret) | |
465 | return ret; | |
466 | ||
62f228ac | 467 | ret = ircomm_tty_block_til_ready(self, tty, filp); |
1da177e4 | 468 | if (ret) { |
6819bc2e | 469 | IRDA_DEBUG(2, |
0dc47877 | 470 | "%s(), returning after block_til_ready with %d\n", __func__ , |
1da177e4 LT |
471 | ret); |
472 | ||
473 | return ret; | |
474 | } | |
475 | return 0; | |
476 | } | |
477 | ||
478 | /* | |
479 | * Function ircomm_tty_close (tty, filp) | |
480 | * | |
481 | * This routine is called when a particular tty device is closed. | |
482 | * | |
483 | */ | |
484 | static void ircomm_tty_close(struct tty_struct *tty, struct file *filp) | |
485 | { | |
486 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
487 | unsigned long flags; | |
488 | ||
0dc47877 | 489 | IRDA_DEBUG(0, "%s()\n", __func__ ); |
1da177e4 | 490 | |
1da177e4 LT |
491 | IRDA_ASSERT(self != NULL, return;); |
492 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
493 | ||
e673927d | 494 | spin_lock_irqsave(&self->port.lock, flags); |
1da177e4 LT |
495 | |
496 | if (tty_hung_up_p(filp)) { | |
e673927d | 497 | spin_unlock_irqrestore(&self->port.lock, flags); |
1da177e4 | 498 | |
0dc47877 | 499 | IRDA_DEBUG(0, "%s(), returning 1\n", __func__ ); |
1da177e4 LT |
500 | return; |
501 | } | |
502 | ||
580d27b4 | 503 | if ((tty->count == 1) && (self->port.count != 1)) { |
1da177e4 LT |
504 | /* |
505 | * Uh, oh. tty->count is 1, which means that the tty | |
506 | * structure will be freed. state->count should always | |
507 | * be one in these conditions. If it's greater than | |
508 | * one, we've got real problems, since it means the | |
509 | * serial port won't be shutdown. | |
510 | */ | |
511 | IRDA_DEBUG(0, "%s(), bad serial port count; " | |
0dc47877 | 512 | "tty->count is 1, state->count is %d\n", __func__ , |
580d27b4 JS |
513 | self->port.count); |
514 | self->port.count = 1; | |
1da177e4 LT |
515 | } |
516 | ||
580d27b4 | 517 | if (--self->port.count < 0) { |
1da177e4 | 518 | IRDA_ERROR("%s(), bad serial port count for ttys%d: %d\n", |
580d27b4 JS |
519 | __func__, self->line, self->port.count); |
520 | self->port.count = 0; | |
1da177e4 | 521 | } |
580d27b4 | 522 | if (self->port.count) { |
e673927d | 523 | spin_unlock_irqrestore(&self->port.lock, flags); |
1da177e4 | 524 | |
0dc47877 | 525 | IRDA_DEBUG(0, "%s(), open count > 0\n", __func__ ); |
1da177e4 LT |
526 | return; |
527 | } | |
528 | ||
849d5a99 | 529 | set_bit(ASYNCB_CLOSING, &self->port.flags); |
1da177e4 | 530 | |
e673927d | 531 | spin_unlock_irqrestore(&self->port.lock, flags); |
1da177e4 LT |
532 | |
533 | /* | |
6819bc2e | 534 | * Now we wait for the transmit buffer to clear; and we notify |
1da177e4 LT |
535 | * the line discipline to only process XON/XOFF characters. |
536 | */ | |
537 | tty->closing = 1; | |
2a0213cb JS |
538 | if (self->port.closing_wait != ASYNC_CLOSING_WAIT_NONE) |
539 | tty_wait_until_sent_from_close(tty, self->port.closing_wait); | |
1da177e4 LT |
540 | |
541 | ircomm_tty_shutdown(self); | |
542 | ||
f34d7a5b AC |
543 | tty_driver_flush_buffer(tty); |
544 | tty_ldisc_flush(tty); | |
1da177e4 | 545 | |
e673927d | 546 | spin_lock_irqsave(&self->port.lock, flags); |
1da177e4 | 547 | tty->closing = 0; |
1da177e4 | 548 | |
580d27b4 | 549 | if (self->port.blocked_open) { |
e673927d JS |
550 | if (self->port.close_delay) { |
551 | spin_unlock_irqrestore(&self->port.lock, flags); | |
2a0213cb | 552 | schedule_timeout_interruptible(self->port.close_delay); |
e673927d JS |
553 | spin_lock_irqsave(&self->port.lock, flags); |
554 | } | |
a3cc9fcf | 555 | wake_up_interruptible(&self->port.open_wait); |
1da177e4 LT |
556 | } |
557 | ||
849d5a99 | 558 | self->port.flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING); |
e673927d | 559 | spin_unlock_irqrestore(&self->port.lock, flags); |
a3cc9fcf | 560 | wake_up_interruptible(&self->port.close_wait); |
62f228ac | 561 | tty_port_tty_set(&self->port, NULL); |
1da177e4 LT |
562 | } |
563 | ||
564 | /* | |
565 | * Function ircomm_tty_flush_buffer (tty) | |
566 | * | |
6819bc2e | 567 | * |
1da177e4 LT |
568 | * |
569 | */ | |
570 | static void ircomm_tty_flush_buffer(struct tty_struct *tty) | |
571 | { | |
572 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
573 | ||
574 | IRDA_ASSERT(self != NULL, return;); | |
575 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
576 | ||
6819bc2e YH |
577 | /* |
578 | * Let do_softint() do this to avoid race condition with | |
579 | * do_softint() ;-) | |
1da177e4 LT |
580 | */ |
581 | schedule_work(&self->tqueue); | |
582 | } | |
583 | ||
584 | /* | |
c4028958 | 585 | * Function ircomm_tty_do_softint (work) |
1da177e4 LT |
586 | * |
587 | * We use this routine to give the write wakeup to the user at at a | |
6819bc2e | 588 | * safe time (as fast as possible after write have completed). This |
1da177e4 LT |
589 | * can be compared to the Tx interrupt. |
590 | */ | |
c4028958 | 591 | static void ircomm_tty_do_softint(struct work_struct *work) |
1da177e4 | 592 | { |
c4028958 DH |
593 | struct ircomm_tty_cb *self = |
594 | container_of(work, struct ircomm_tty_cb, tqueue); | |
1da177e4 LT |
595 | struct tty_struct *tty; |
596 | unsigned long flags; | |
597 | struct sk_buff *skb, *ctrl_skb; | |
598 | ||
0dc47877 | 599 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 LT |
600 | |
601 | if (!self || self->magic != IRCOMM_TTY_MAGIC) | |
602 | return; | |
603 | ||
62f228ac | 604 | tty = tty_port_tty_get(&self->port); |
1da177e4 LT |
605 | if (!tty) |
606 | return; | |
607 | ||
608 | /* Unlink control buffer */ | |
609 | spin_lock_irqsave(&self->spinlock, flags); | |
610 | ||
611 | ctrl_skb = self->ctrl_skb; | |
612 | self->ctrl_skb = NULL; | |
613 | ||
614 | spin_unlock_irqrestore(&self->spinlock, flags); | |
615 | ||
616 | /* Flush control buffer if any */ | |
617 | if(ctrl_skb) { | |
618 | if(self->flow == FLOW_START) | |
619 | ircomm_control_request(self->ircomm, ctrl_skb); | |
620 | /* Drop reference count - see ircomm_ttp_data_request(). */ | |
621 | dev_kfree_skb(ctrl_skb); | |
622 | } | |
623 | ||
624 | if (tty->hw_stopped) | |
62f228ac | 625 | goto put; |
1da177e4 LT |
626 | |
627 | /* Unlink transmit buffer */ | |
628 | spin_lock_irqsave(&self->spinlock, flags); | |
6819bc2e | 629 | |
1da177e4 LT |
630 | skb = self->tx_skb; |
631 | self->tx_skb = NULL; | |
632 | ||
633 | spin_unlock_irqrestore(&self->spinlock, flags); | |
634 | ||
635 | /* Flush transmit buffer if any */ | |
636 | if (skb) { | |
637 | ircomm_tty_do_event(self, IRCOMM_TTY_DATA_REQUEST, skb, NULL); | |
638 | /* Drop reference count - see ircomm_ttp_data_request(). */ | |
639 | dev_kfree_skb(skb); | |
640 | } | |
6819bc2e | 641 | |
1da177e4 | 642 | /* Check if user (still) wants to be waken up */ |
a352def2 | 643 | tty_wakeup(tty); |
62f228ac JS |
644 | put: |
645 | tty_kref_put(tty); | |
1da177e4 LT |
646 | } |
647 | ||
648 | /* | |
649 | * Function ircomm_tty_write (tty, buf, count) | |
650 | * | |
651 | * This routine is called by the kernel to write a series of characters | |
652 | * to the tty device. The characters may come from user space or kernel | |
653 | * space. This routine will return the number of characters actually | |
654 | * accepted for writing. This routine is mandatory. | |
655 | */ | |
656 | static int ircomm_tty_write(struct tty_struct *tty, | |
657 | const unsigned char *buf, int count) | |
658 | { | |
659 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
660 | unsigned long flags; | |
661 | struct sk_buff *skb; | |
662 | int tailroom = 0; | |
663 | int len = 0; | |
664 | int size; | |
665 | ||
0dc47877 | 666 | IRDA_DEBUG(2, "%s(), count=%d, hw_stopped=%d\n", __func__ , count, |
1da177e4 LT |
667 | tty->hw_stopped); |
668 | ||
669 | IRDA_ASSERT(self != NULL, return -1;); | |
670 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
671 | ||
672 | /* We may receive packets from the TTY even before we have finished | |
673 | * our setup. Not cool. | |
674 | * The problem is that we don't know the final header and data size | |
675 | * to create the proper skb, so any skb we would create would have | |
676 | * bogus header and data size, so need care. | |
677 | * We use a bogus header size to safely detect this condition. | |
678 | * Another problem is that hw_stopped was set to 0 way before it | |
679 | * should be, so we would drop this skb. It should now be fixed. | |
680 | * One option is to not accept data until we are properly setup. | |
681 | * But, I suspect that when it happens, the ppp line discipline | |
682 | * just "drops" the data, which might screw up connect scripts. | |
683 | * The second option is to create a "safe skb", with large header | |
684 | * and small size (see ircomm_tty_open() for values). | |
685 | * We just need to make sure that when the real values get filled, | |
686 | * we don't mess up the original "safe skb" (see tx_data_size). | |
687 | * Jean II */ | |
688 | if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) { | |
0dc47877 | 689 | IRDA_DEBUG(1, "%s() : not initialised\n", __func__); |
1da177e4 LT |
690 | #ifdef IRCOMM_NO_TX_BEFORE_INIT |
691 | /* We didn't consume anything, TTY will retry */ | |
692 | return 0; | |
693 | #endif | |
694 | } | |
695 | ||
696 | if (count < 1) | |
697 | return 0; | |
698 | ||
699 | /* Protect our manipulation of self->tx_skb and related */ | |
700 | spin_lock_irqsave(&self->spinlock, flags); | |
701 | ||
702 | /* Fetch current transmit buffer */ | |
703 | skb = self->tx_skb; | |
704 | ||
6819bc2e | 705 | /* |
1da177e4 LT |
706 | * Send out all the data we get, possibly as multiple fragmented |
707 | * frames, but this will only happen if the data is larger than the | |
708 | * max data size. The normal case however is just the opposite, and | |
709 | * this function may be called multiple times, and will then actually | |
6819bc2e | 710 | * defragment the data and send it out as one packet as soon as |
1da177e4 LT |
711 | * possible, but at a safer point in time |
712 | */ | |
713 | while (count) { | |
714 | size = count; | |
715 | ||
716 | /* Adjust data size to the max data size */ | |
717 | if (size > self->max_data_size) | |
718 | size = self->max_data_size; | |
6819bc2e YH |
719 | |
720 | /* | |
1da177e4 | 721 | * Do we already have a buffer ready for transmit, or do |
6819bc2e | 722 | * we need to allocate a new frame |
1da177e4 | 723 | */ |
6819bc2e YH |
724 | if (skb) { |
725 | /* | |
726 | * Any room for more data at the end of the current | |
1da177e4 | 727 | * transmit buffer? Cannot use skb_tailroom, since |
6819bc2e | 728 | * dev_alloc_skb gives us a larger skb than we |
1da177e4 LT |
729 | * requested |
730 | * Note : use tx_data_size, because max_data_size | |
731 | * may have changed and we don't want to overwrite | |
732 | * the skb. - Jean II | |
733 | */ | |
734 | if ((tailroom = (self->tx_data_size - skb->len)) > 0) { | |
735 | /* Adjust data to tailroom */ | |
736 | if (size > tailroom) | |
737 | size = tailroom; | |
738 | } else { | |
6819bc2e YH |
739 | /* |
740 | * Current transmit frame is full, so break | |
1da177e4 LT |
741 | * out, so we can send it as soon as possible |
742 | */ | |
743 | break; | |
744 | } | |
745 | } else { | |
746 | /* Prepare a full sized frame */ | |
485fb2c9 SO |
747 | skb = alloc_skb(self->max_data_size+ |
748 | self->max_header_size, | |
749 | GFP_ATOMIC); | |
1da177e4 LT |
750 | if (!skb) { |
751 | spin_unlock_irqrestore(&self->spinlock, flags); | |
752 | return -ENOBUFS; | |
753 | } | |
754 | skb_reserve(skb, self->max_header_size); | |
755 | self->tx_skb = skb; | |
756 | /* Remember skb size because max_data_size may | |
757 | * change later on - Jean II */ | |
758 | self->tx_data_size = self->max_data_size; | |
759 | } | |
760 | ||
761 | /* Copy data */ | |
762 | memcpy(skb_put(skb,size), buf + len, size); | |
763 | ||
764 | count -= size; | |
765 | len += size; | |
766 | } | |
767 | ||
768 | spin_unlock_irqrestore(&self->spinlock, flags); | |
769 | ||
6819bc2e | 770 | /* |
1da177e4 LT |
771 | * Schedule a new thread which will transmit the frame as soon |
772 | * as possible, but at a safe point in time. We do this so the | |
773 | * "user" can give us data multiple times, as PPP does (because of | |
774 | * its 256 byte tx buffer). We will then defragment and send out | |
6819bc2e | 775 | * all this data as one single packet. |
1da177e4 LT |
776 | */ |
777 | schedule_work(&self->tqueue); | |
6819bc2e | 778 | |
1da177e4 LT |
779 | return len; |
780 | } | |
781 | ||
782 | /* | |
783 | * Function ircomm_tty_write_room (tty) | |
784 | * | |
785 | * This routine returns the numbers of characters the tty driver will | |
786 | * accept for queuing to be written. This number is subject to change as | |
787 | * output buffers get emptied, or if the output flow control is acted. | |
788 | */ | |
789 | static int ircomm_tty_write_room(struct tty_struct *tty) | |
790 | { | |
791 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
792 | unsigned long flags; | |
793 | int ret; | |
794 | ||
795 | IRDA_ASSERT(self != NULL, return -1;); | |
796 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
797 | ||
798 | #ifdef IRCOMM_NO_TX_BEFORE_INIT | |
799 | /* max_header_size tells us if the channel is initialised or not. */ | |
800 | if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) | |
801 | /* Don't bother us yet */ | |
802 | return 0; | |
803 | #endif | |
804 | ||
805 | /* Check if we are allowed to transmit any data. | |
806 | * hw_stopped is the regular flow control. | |
807 | * Jean II */ | |
808 | if (tty->hw_stopped) | |
809 | ret = 0; | |
810 | else { | |
811 | spin_lock_irqsave(&self->spinlock, flags); | |
812 | if (self->tx_skb) | |
813 | ret = self->tx_data_size - self->tx_skb->len; | |
814 | else | |
815 | ret = self->max_data_size; | |
816 | spin_unlock_irqrestore(&self->spinlock, flags); | |
817 | } | |
0dc47877 | 818 | IRDA_DEBUG(2, "%s(), ret=%d\n", __func__ , ret); |
1da177e4 LT |
819 | |
820 | return ret; | |
821 | } | |
822 | ||
823 | /* | |
824 | * Function ircomm_tty_wait_until_sent (tty, timeout) | |
825 | * | |
826 | * This routine waits until the device has written out all of the | |
827 | * characters in its transmitter FIFO. | |
828 | */ | |
829 | static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout) | |
830 | { | |
831 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
832 | unsigned long orig_jiffies, poll_time; | |
833 | unsigned long flags; | |
6819bc2e | 834 | |
0dc47877 | 835 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 LT |
836 | |
837 | IRDA_ASSERT(self != NULL, return;); | |
838 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
839 | ||
840 | orig_jiffies = jiffies; | |
841 | ||
842 | /* Set poll time to 200 ms */ | |
843 | poll_time = IRDA_MIN(timeout, msecs_to_jiffies(200)); | |
844 | ||
845 | spin_lock_irqsave(&self->spinlock, flags); | |
846 | while (self->tx_skb && self->tx_skb->len) { | |
847 | spin_unlock_irqrestore(&self->spinlock, flags); | |
121caf57 | 848 | schedule_timeout_interruptible(poll_time); |
1da177e4 LT |
849 | spin_lock_irqsave(&self->spinlock, flags); |
850 | if (signal_pending(current)) | |
851 | break; | |
852 | if (timeout && time_after(jiffies, orig_jiffies + timeout)) | |
853 | break; | |
854 | } | |
855 | spin_unlock_irqrestore(&self->spinlock, flags); | |
856 | current->state = TASK_RUNNING; | |
857 | } | |
858 | ||
859 | /* | |
860 | * Function ircomm_tty_throttle (tty) | |
861 | * | |
862 | * This routine notifies the tty driver that input buffers for the line | |
863 | * discipline are close to full, and it should somehow signal that no | |
6819bc2e | 864 | * more characters should be sent to the tty. |
1da177e4 LT |
865 | */ |
866 | static void ircomm_tty_throttle(struct tty_struct *tty) | |
867 | { | |
868 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
869 | ||
0dc47877 | 870 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 LT |
871 | |
872 | IRDA_ASSERT(self != NULL, return;); | |
873 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
874 | ||
875 | /* Software flow control? */ | |
876 | if (I_IXOFF(tty)) | |
877 | ircomm_tty_send_xchar(tty, STOP_CHAR(tty)); | |
6819bc2e | 878 | |
1da177e4 LT |
879 | /* Hardware flow control? */ |
880 | if (tty->termios->c_cflag & CRTSCTS) { | |
881 | self->settings.dte &= ~IRCOMM_RTS; | |
882 | self->settings.dte |= IRCOMM_DELTA_RTS; | |
6819bc2e | 883 | |
1da177e4 LT |
884 | ircomm_param_request(self, IRCOMM_DTE, TRUE); |
885 | } | |
886 | ||
6819bc2e | 887 | ircomm_flow_request(self->ircomm, FLOW_STOP); |
1da177e4 LT |
888 | } |
889 | ||
890 | /* | |
891 | * Function ircomm_tty_unthrottle (tty) | |
892 | * | |
893 | * This routine notifies the tty drivers that it should signals that | |
894 | * characters can now be sent to the tty without fear of overrunning the | |
895 | * input buffers of the line disciplines. | |
896 | */ | |
897 | static void ircomm_tty_unthrottle(struct tty_struct *tty) | |
898 | { | |
899 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
900 | ||
0dc47877 | 901 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 LT |
902 | |
903 | IRDA_ASSERT(self != NULL, return;); | |
904 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
905 | ||
906 | /* Using software flow control? */ | |
907 | if (I_IXOFF(tty)) { | |
908 | ircomm_tty_send_xchar(tty, START_CHAR(tty)); | |
909 | } | |
910 | ||
911 | /* Using hardware flow control? */ | |
912 | if (tty->termios->c_cflag & CRTSCTS) { | |
913 | self->settings.dte |= (IRCOMM_RTS|IRCOMM_DELTA_RTS); | |
914 | ||
915 | ircomm_param_request(self, IRCOMM_DTE, TRUE); | |
0dc47877 | 916 | IRDA_DEBUG(1, "%s(), FLOW_START\n", __func__ ); |
1da177e4 | 917 | } |
6819bc2e | 918 | ircomm_flow_request(self->ircomm, FLOW_START); |
1da177e4 LT |
919 | } |
920 | ||
921 | /* | |
922 | * Function ircomm_tty_chars_in_buffer (tty) | |
923 | * | |
924 | * Indicates if there are any data in the buffer | |
925 | * | |
926 | */ | |
927 | static int ircomm_tty_chars_in_buffer(struct tty_struct *tty) | |
928 | { | |
929 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
930 | unsigned long flags; | |
931 | int len = 0; | |
932 | ||
933 | IRDA_ASSERT(self != NULL, return -1;); | |
934 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
935 | ||
936 | spin_lock_irqsave(&self->spinlock, flags); | |
937 | ||
938 | if (self->tx_skb) | |
939 | len = self->tx_skb->len; | |
940 | ||
941 | spin_unlock_irqrestore(&self->spinlock, flags); | |
942 | ||
943 | return len; | |
944 | } | |
945 | ||
946 | static void ircomm_tty_shutdown(struct ircomm_tty_cb *self) | |
947 | { | |
948 | unsigned long flags; | |
949 | ||
950 | IRDA_ASSERT(self != NULL, return;); | |
951 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
952 | ||
0dc47877 | 953 | IRDA_DEBUG(0, "%s()\n", __func__ ); |
1da177e4 | 954 | |
849d5a99 | 955 | if (!test_and_clear_bit(ASYNCB_INITIALIZED, &self->port.flags)) |
1da177e4 LT |
956 | return; |
957 | ||
958 | ircomm_tty_detach_cable(self); | |
959 | ||
960 | spin_lock_irqsave(&self->spinlock, flags); | |
961 | ||
962 | del_timer(&self->watchdog_timer); | |
6819bc2e | 963 | |
1da177e4 LT |
964 | /* Free parameter buffer */ |
965 | if (self->ctrl_skb) { | |
966 | dev_kfree_skb(self->ctrl_skb); | |
967 | self->ctrl_skb = NULL; | |
968 | } | |
969 | ||
970 | /* Free transmit buffer */ | |
971 | if (self->tx_skb) { | |
972 | dev_kfree_skb(self->tx_skb); | |
973 | self->tx_skb = NULL; | |
974 | } | |
975 | ||
976 | if (self->ircomm) { | |
977 | ircomm_close(self->ircomm); | |
978 | self->ircomm = NULL; | |
979 | } | |
980 | ||
981 | spin_unlock_irqrestore(&self->spinlock, flags); | |
982 | } | |
983 | ||
984 | /* | |
985 | * Function ircomm_tty_hangup (tty) | |
986 | * | |
987 | * This routine notifies the tty driver that it should hangup the tty | |
988 | * device. | |
6819bc2e | 989 | * |
1da177e4 LT |
990 | */ |
991 | static void ircomm_tty_hangup(struct tty_struct *tty) | |
992 | { | |
993 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
994 | unsigned long flags; | |
995 | ||
0dc47877 | 996 | IRDA_DEBUG(0, "%s()\n", __func__ ); |
1da177e4 LT |
997 | |
998 | IRDA_ASSERT(self != NULL, return;); | |
999 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
1000 | ||
1da177e4 LT |
1001 | /* ircomm_tty_flush_buffer(tty); */ |
1002 | ircomm_tty_shutdown(self); | |
1003 | ||
e673927d | 1004 | spin_lock_irqsave(&self->port.lock, flags); |
849d5a99 | 1005 | self->port.flags &= ~ASYNC_NORMAL_ACTIVE; |
62f228ac JS |
1006 | if (self->port.tty) { |
1007 | set_bit(TTY_IO_ERROR, &self->port.tty->flags); | |
1008 | tty_kref_put(self->port.tty); | |
1009 | } | |
1010 | self->port.tty = NULL; | |
580d27b4 | 1011 | self->port.count = 0; |
e673927d | 1012 | spin_unlock_irqrestore(&self->port.lock, flags); |
1da177e4 | 1013 | |
a3cc9fcf | 1014 | wake_up_interruptible(&self->port.open_wait); |
1da177e4 LT |
1015 | } |
1016 | ||
1017 | /* | |
1018 | * Function ircomm_tty_send_xchar (tty, ch) | |
1019 | * | |
1020 | * This routine is used to send a high-priority XON/XOFF character to | |
1021 | * the device. | |
1022 | */ | |
1023 | static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch) | |
1024 | { | |
0dc47877 | 1025 | IRDA_DEBUG(0, "%s(), not impl\n", __func__ ); |
1da177e4 LT |
1026 | } |
1027 | ||
1028 | /* | |
1029 | * Function ircomm_tty_start (tty) | |
1030 | * | |
1031 | * This routine notifies the tty driver that it resume sending | |
6819bc2e | 1032 | * characters to the tty device. |
1da177e4 LT |
1033 | */ |
1034 | void ircomm_tty_start(struct tty_struct *tty) | |
1035 | { | |
1036 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
1037 | ||
1038 | ircomm_flow_request(self->ircomm, FLOW_START); | |
1039 | } | |
1040 | ||
1041 | /* | |
1042 | * Function ircomm_tty_stop (tty) | |
1043 | * | |
1044 | * This routine notifies the tty driver that it should stop outputting | |
6819bc2e | 1045 | * characters to the tty device. |
1da177e4 | 1046 | */ |
6819bc2e | 1047 | static void ircomm_tty_stop(struct tty_struct *tty) |
1da177e4 LT |
1048 | { |
1049 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
1050 | ||
1051 | IRDA_ASSERT(self != NULL, return;); | |
1052 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
1053 | ||
1054 | ircomm_flow_request(self->ircomm, FLOW_STOP); | |
1055 | } | |
1056 | ||
1057 | /* | |
1058 | * Function ircomm_check_modem_status (self) | |
1059 | * | |
1060 | * Check for any changes in the DCE's line settings. This function should | |
1061 | * be called whenever the dce parameter settings changes, to update the | |
1062 | * flow control settings and other things | |
1063 | */ | |
1064 | void ircomm_tty_check_modem_status(struct ircomm_tty_cb *self) | |
1065 | { | |
1066 | struct tty_struct *tty; | |
1067 | int status; | |
1068 | ||
0dc47877 | 1069 | IRDA_DEBUG(0, "%s()\n", __func__ ); |
1da177e4 LT |
1070 | |
1071 | IRDA_ASSERT(self != NULL, return;); | |
1072 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
1073 | ||
62f228ac | 1074 | tty = tty_port_tty_get(&self->port); |
1da177e4 LT |
1075 | |
1076 | status = self->settings.dce; | |
1077 | ||
1078 | if (status & IRCOMM_DCE_DELTA_ANY) { | |
1079 | /*wake_up_interruptible(&self->delta_msr_wait);*/ | |
1080 | } | |
849d5a99 | 1081 | if ((self->port.flags & ASYNC_CHECK_CD) && (status & IRCOMM_DELTA_CD)) { |
6819bc2e | 1082 | IRDA_DEBUG(2, |
0dc47877 | 1083 | "%s(), ircomm%d CD now %s...\n", __func__ , self->line, |
1da177e4 LT |
1084 | (status & IRCOMM_CD) ? "on" : "off"); |
1085 | ||
1086 | if (status & IRCOMM_CD) { | |
a3cc9fcf | 1087 | wake_up_interruptible(&self->port.open_wait); |
1da177e4 | 1088 | } else { |
6819bc2e | 1089 | IRDA_DEBUG(2, |
0dc47877 | 1090 | "%s(), Doing serial hangup..\n", __func__ ); |
1da177e4 LT |
1091 | if (tty) |
1092 | tty_hangup(tty); | |
1093 | ||
1094 | /* Hangup will remote the tty, so better break out */ | |
62f228ac | 1095 | goto put; |
1da177e4 LT |
1096 | } |
1097 | } | |
62f228ac | 1098 | if (tty && self->port.flags & ASYNC_CTS_FLOW) { |
1da177e4 LT |
1099 | if (tty->hw_stopped) { |
1100 | if (status & IRCOMM_CTS) { | |
6819bc2e | 1101 | IRDA_DEBUG(2, |
0dc47877 | 1102 | "%s(), CTS tx start...\n", __func__ ); |
1da177e4 | 1103 | tty->hw_stopped = 0; |
6819bc2e | 1104 | |
1da177e4 | 1105 | /* Wake up processes blocked on open */ |
a3cc9fcf | 1106 | wake_up_interruptible(&self->port.open_wait); |
1da177e4 LT |
1107 | |
1108 | schedule_work(&self->tqueue); | |
62f228ac | 1109 | goto put; |
1da177e4 LT |
1110 | } |
1111 | } else { | |
1112 | if (!(status & IRCOMM_CTS)) { | |
6819bc2e | 1113 | IRDA_DEBUG(2, |
0dc47877 | 1114 | "%s(), CTS tx stop...\n", __func__ ); |
1da177e4 LT |
1115 | tty->hw_stopped = 1; |
1116 | } | |
1117 | } | |
1118 | } | |
62f228ac JS |
1119 | put: |
1120 | tty_kref_put(tty); | |
1da177e4 LT |
1121 | } |
1122 | ||
1123 | /* | |
1124 | * Function ircomm_tty_data_indication (instance, sap, skb) | |
1125 | * | |
1126 | * Handle incoming data, and deliver it to the line discipline | |
1127 | * | |
1128 | */ | |
1129 | static int ircomm_tty_data_indication(void *instance, void *sap, | |
1130 | struct sk_buff *skb) | |
1131 | { | |
1132 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; | |
62f228ac | 1133 | struct tty_struct *tty; |
1da177e4 | 1134 | |
0dc47877 | 1135 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
6819bc2e | 1136 | |
1da177e4 LT |
1137 | IRDA_ASSERT(self != NULL, return -1;); |
1138 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
1139 | IRDA_ASSERT(skb != NULL, return -1;); | |
1140 | ||
62f228ac JS |
1141 | tty = tty_port_tty_get(&self->port); |
1142 | if (!tty) { | |
0dc47877 | 1143 | IRDA_DEBUG(0, "%s(), no tty!\n", __func__ ); |
1da177e4 LT |
1144 | return 0; |
1145 | } | |
1146 | ||
6819bc2e | 1147 | /* |
1da177e4 LT |
1148 | * If we receive data when hardware is stopped then something is wrong. |
1149 | * We try to poll the peers line settings to check if we are up todate. | |
6819bc2e | 1150 | * Devices like WinCE can do this, and since they don't send any |
1da177e4 LT |
1151 | * params, we can just as well declare the hardware for running. |
1152 | */ | |
62f228ac | 1153 | if (tty->hw_stopped && (self->flow == FLOW_START)) { |
0dc47877 | 1154 | IRDA_DEBUG(0, "%s(), polling for line settings!\n", __func__ ); |
1da177e4 LT |
1155 | ircomm_param_request(self, IRCOMM_POLL, TRUE); |
1156 | ||
1157 | /* We can just as well declare the hardware for running */ | |
1158 | ircomm_tty_send_initial_parameters(self); | |
1159 | ircomm_tty_link_established(self); | |
1160 | } | |
1161 | ||
6819bc2e | 1162 | /* |
cbfd1526 AV |
1163 | * Use flip buffer functions since the code may be called from interrupt |
1164 | * context | |
1da177e4 | 1165 | */ |
62f228ac JS |
1166 | tty_insert_flip_string(tty, skb->data, skb->len); |
1167 | tty_flip_buffer_push(tty); | |
1168 | tty_kref_put(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 | ||
62f228ac | 1219 | tty = tty_port_tty_get(&self->port); |
1da177e4 LT |
1220 | |
1221 | switch (cmd) { | |
1222 | case FLOW_START: | |
0dc47877 | 1223 | IRDA_DEBUG(2, "%s(), hw start!\n", __func__ ); |
62f228ac JS |
1224 | if (tty) |
1225 | tty->hw_stopped = 0; | |
1da177e4 LT |
1226 | |
1227 | /* ircomm_tty_do_softint will take care of the rest */ | |
1228 | schedule_work(&self->tqueue); | |
1229 | break; | |
1230 | default: /* If we get here, something is very wrong, better stop */ | |
1231 | case FLOW_STOP: | |
0dc47877 | 1232 | IRDA_DEBUG(2, "%s(), hw stopped!\n", __func__ ); |
62f228ac JS |
1233 | if (tty) |
1234 | tty->hw_stopped = 1; | |
1da177e4 LT |
1235 | break; |
1236 | } | |
62f228ac JS |
1237 | |
1238 | tty_kref_put(tty); | |
1da177e4 LT |
1239 | self->flow = cmd; |
1240 | } | |
1241 | ||
92b05e13 | 1242 | #ifdef CONFIG_PROC_FS |
3d304176 | 1243 | static void ircomm_tty_line_info(struct ircomm_tty_cb *self, struct seq_file *m) |
1da177e4 | 1244 | { |
62f228ac | 1245 | struct tty_struct *tty; |
3d304176 | 1246 | char sep; |
1da177e4 | 1247 | |
3d304176 | 1248 | seq_printf(m, "State: %s\n", ircomm_tty_state[self->state]); |
1da177e4 | 1249 | |
3d304176 | 1250 | seq_puts(m, "Service type: "); |
1da177e4 | 1251 | if (self->service_type & IRCOMM_9_WIRE) |
3d304176 | 1252 | seq_puts(m, "9_WIRE"); |
1da177e4 | 1253 | else if (self->service_type & IRCOMM_3_WIRE) |
3d304176 | 1254 | seq_puts(m, "3_WIRE"); |
1da177e4 | 1255 | else if (self->service_type & IRCOMM_3_WIRE_RAW) |
3d304176 | 1256 | seq_puts(m, "3_WIRE_RAW"); |
1da177e4 | 1257 | else |
3d304176 AD |
1258 | seq_puts(m, "No common service type!\n"); |
1259 | seq_putc(m, '\n'); | |
1260 | ||
1261 | seq_printf(m, "Port name: %s\n", self->settings.port_name); | |
1262 | ||
1263 | seq_printf(m, "DTE status:"); | |
1264 | sep = ' '; | |
1265 | if (self->settings.dte & IRCOMM_RTS) { | |
1266 | seq_printf(m, "%cRTS", sep); | |
1267 | sep = '|'; | |
1268 | } | |
1269 | if (self->settings.dte & IRCOMM_DTR) { | |
1270 | seq_printf(m, "%cDTR", sep); | |
1271 | sep = '|'; | |
1272 | } | |
1273 | seq_putc(m, '\n'); | |
1274 | ||
1275 | seq_puts(m, "DCE status:"); | |
1276 | sep = ' '; | |
1277 | if (self->settings.dce & IRCOMM_CTS) { | |
1278 | seq_printf(m, "%cCTS", sep); | |
1279 | sep = '|'; | |
1280 | } | |
1281 | if (self->settings.dce & IRCOMM_DSR) { | |
1282 | seq_printf(m, "%cDSR", sep); | |
1283 | sep = '|'; | |
1284 | } | |
1285 | if (self->settings.dce & IRCOMM_CD) { | |
1286 | seq_printf(m, "%cCD", sep); | |
1287 | sep = '|'; | |
1288 | } | |
1289 | if (self->settings.dce & IRCOMM_RI) { | |
1290 | seq_printf(m, "%cRI", sep); | |
1291 | sep = '|'; | |
1292 | } | |
1293 | seq_putc(m, '\n'); | |
1294 | ||
1295 | seq_puts(m, "Configuration: "); | |
1da177e4 | 1296 | if (!self->settings.null_modem) |
3d304176 | 1297 | seq_puts(m, "DTE <-> DCE\n"); |
1da177e4 | 1298 | else |
3d304176 AD |
1299 | seq_puts(m, "DTE <-> DTE (null modem emulation)\n"); |
1300 | ||
1301 | seq_printf(m, "Data rate: %d\n", self->settings.data_rate); | |
1302 | ||
1303 | seq_puts(m, "Flow control:"); | |
1304 | sep = ' '; | |
1305 | if (self->settings.flow_control & IRCOMM_XON_XOFF_IN) { | |
1306 | seq_printf(m, "%cXON_XOFF_IN", sep); | |
1307 | sep = '|'; | |
1308 | } | |
1309 | if (self->settings.flow_control & IRCOMM_XON_XOFF_OUT) { | |
1310 | seq_printf(m, "%cXON_XOFF_OUT", sep); | |
1311 | sep = '|'; | |
1312 | } | |
1313 | if (self->settings.flow_control & IRCOMM_RTS_CTS_IN) { | |
1314 | seq_printf(m, "%cRTS_CTS_IN", sep); | |
1315 | sep = '|'; | |
1316 | } | |
1317 | if (self->settings.flow_control & IRCOMM_RTS_CTS_OUT) { | |
1318 | seq_printf(m, "%cRTS_CTS_OUT", sep); | |
1319 | sep = '|'; | |
1320 | } | |
1321 | if (self->settings.flow_control & IRCOMM_DSR_DTR_IN) { | |
1322 | seq_printf(m, "%cDSR_DTR_IN", sep); | |
1323 | sep = '|'; | |
1324 | } | |
1325 | if (self->settings.flow_control & IRCOMM_DSR_DTR_OUT) { | |
1326 | seq_printf(m, "%cDSR_DTR_OUT", sep); | |
1327 | sep = '|'; | |
1328 | } | |
1329 | if (self->settings.flow_control & IRCOMM_ENQ_ACK_IN) { | |
1330 | seq_printf(m, "%cENQ_ACK_IN", sep); | |
1331 | sep = '|'; | |
1332 | } | |
1333 | if (self->settings.flow_control & IRCOMM_ENQ_ACK_OUT) { | |
1334 | seq_printf(m, "%cENQ_ACK_OUT", sep); | |
1335 | sep = '|'; | |
1336 | } | |
1337 | seq_putc(m, '\n'); | |
1338 | ||
1339 | seq_puts(m, "Flags:"); | |
1340 | sep = ' '; | |
849d5a99 | 1341 | if (self->port.flags & ASYNC_CTS_FLOW) { |
3d304176 AD |
1342 | seq_printf(m, "%cASYNC_CTS_FLOW", sep); |
1343 | sep = '|'; | |
1344 | } | |
849d5a99 | 1345 | if (self->port.flags & ASYNC_CHECK_CD) { |
3d304176 AD |
1346 | seq_printf(m, "%cASYNC_CHECK_CD", sep); |
1347 | sep = '|'; | |
1348 | } | |
849d5a99 | 1349 | if (self->port.flags & ASYNC_INITIALIZED) { |
3d304176 AD |
1350 | seq_printf(m, "%cASYNC_INITIALIZED", sep); |
1351 | sep = '|'; | |
1352 | } | |
849d5a99 | 1353 | if (self->port.flags & ASYNC_LOW_LATENCY) { |
3d304176 AD |
1354 | seq_printf(m, "%cASYNC_LOW_LATENCY", sep); |
1355 | sep = '|'; | |
1356 | } | |
849d5a99 | 1357 | if (self->port.flags & ASYNC_CLOSING) { |
3d304176 AD |
1358 | seq_printf(m, "%cASYNC_CLOSING", sep); |
1359 | sep = '|'; | |
1360 | } | |
849d5a99 | 1361 | if (self->port.flags & ASYNC_NORMAL_ACTIVE) { |
3d304176 AD |
1362 | seq_printf(m, "%cASYNC_NORMAL_ACTIVE", sep); |
1363 | sep = '|'; | |
1364 | } | |
1365 | seq_putc(m, '\n'); | |
1366 | ||
1367 | seq_printf(m, "Role: %s\n", self->client ? "client" : "server"); | |
580d27b4 | 1368 | seq_printf(m, "Open count: %d\n", self->port.count); |
3d304176 AD |
1369 | seq_printf(m, "Max data size: %d\n", self->max_data_size); |
1370 | seq_printf(m, "Max header size: %d\n", self->max_header_size); | |
6819bc2e | 1371 | |
62f228ac JS |
1372 | tty = tty_port_tty_get(&self->port); |
1373 | if (tty) { | |
3d304176 | 1374 | seq_printf(m, "Hardware: %s\n", |
62f228ac JS |
1375 | tty->hw_stopped ? "Stopped" : "Running"); |
1376 | tty_kref_put(tty); | |
1377 | } | |
1da177e4 LT |
1378 | } |
1379 | ||
3d304176 | 1380 | static int ircomm_tty_proc_show(struct seq_file *m, void *v) |
1da177e4 LT |
1381 | { |
1382 | struct ircomm_tty_cb *self; | |
1da177e4 LT |
1383 | unsigned long flags; |
1384 | ||
1385 | spin_lock_irqsave(&ircomm_tty->hb_spinlock, flags); | |
1386 | ||
1387 | self = (struct ircomm_tty_cb *) hashbin_get_first(ircomm_tty); | |
3d304176 | 1388 | while (self != NULL) { |
1da177e4 LT |
1389 | if (self->magic != IRCOMM_TTY_MAGIC) |
1390 | break; | |
1391 | ||
3d304176 | 1392 | ircomm_tty_line_info(self, m); |
1da177e4 | 1393 | self = (struct ircomm_tty_cb *) hashbin_get_next(ircomm_tty); |
6819bc2e | 1394 | } |
1da177e4 | 1395 | spin_unlock_irqrestore(&ircomm_tty->hb_spinlock, flags); |
3d304176 AD |
1396 | return 0; |
1397 | } | |
1da177e4 | 1398 | |
3d304176 AD |
1399 | static int ircomm_tty_proc_open(struct inode *inode, struct file *file) |
1400 | { | |
1401 | return single_open(file, ircomm_tty_proc_show, NULL); | |
1da177e4 | 1402 | } |
3d304176 AD |
1403 | |
1404 | static const struct file_operations ircomm_tty_proc_fops = { | |
1405 | .owner = THIS_MODULE, | |
1406 | .open = ircomm_tty_proc_open, | |
1407 | .read = seq_read, | |
1408 | .llseek = seq_lseek, | |
1409 | .release = single_release, | |
1410 | }; | |
1da177e4 LT |
1411 | #endif /* CONFIG_PROC_FS */ |
1412 | ||
1413 | MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>"); | |
1414 | MODULE_DESCRIPTION("IrCOMM serial TTY driver"); | |
1415 | MODULE_LICENSE("GPL"); | |
1416 | MODULE_ALIAS_CHARDEV_MAJOR(IRCOMM_TTY_MAJOR); | |
1417 | ||
1418 | module_init(ircomm_tty_init); | |
1419 | module_exit(ircomm_tty_cleanup); |