]>
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, |
1da177e4 LT |
245 | struct file *filp) |
246 | { | |
247 | DECLARE_WAITQUEUE(wait, current); | |
248 | int retval; | |
249 | int do_clocal = 0, extra_count = 0; | |
250 | unsigned long flags; | |
251 | struct tty_struct *tty; | |
6819bc2e | 252 | |
0dc47877 | 253 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 LT |
254 | |
255 | tty = self->tty; | |
256 | ||
257 | /* | |
258 | * If non-blocking mode is set, or the port is not enabled, | |
259 | * then make the check up front and then exit. | |
6819bc2e | 260 | */ |
1da177e4 LT |
261 | if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){ |
262 | /* nonblock mode is set or port is not enabled */ | |
849d5a99 | 263 | self->port.flags |= ASYNC_NORMAL_ACTIVE; |
0dc47877 | 264 | IRDA_DEBUG(1, "%s(), O_NONBLOCK requested!\n", __func__ ); |
1da177e4 LT |
265 | return 0; |
266 | } | |
267 | ||
268 | if (tty->termios->c_cflag & CLOCAL) { | |
0dc47877 | 269 | IRDA_DEBUG(1, "%s(), doing CLOCAL!\n", __func__ ); |
1da177e4 LT |
270 | do_clocal = 1; |
271 | } | |
6819bc2e | 272 | |
1da177e4 LT |
273 | /* Wait for carrier detect and the line to become |
274 | * free (i.e., not in use by the callout). While we are in | |
580d27b4 | 275 | * this loop, self->port.count is dropped by one, so that |
1da177e4 LT |
276 | * mgsl_close() knows when to free things. We restore it upon |
277 | * exit, either normal or abnormal. | |
278 | */ | |
6819bc2e | 279 | |
1da177e4 | 280 | retval = 0; |
a3cc9fcf | 281 | add_wait_queue(&self->port.open_wait, &wait); |
6819bc2e | 282 | |
1da177e4 | 283 | IRDA_DEBUG(2, "%s(%d):block_til_ready before block on %s open_count=%d\n", |
580d27b4 | 284 | __FILE__, __LINE__, tty->driver->name, self->port.count); |
1da177e4 | 285 | |
e673927d | 286 | spin_lock_irqsave(&self->port.lock, flags); |
1da177e4 LT |
287 | if (!tty_hung_up_p(filp)) { |
288 | extra_count = 1; | |
580d27b4 | 289 | self->port.count--; |
1da177e4 | 290 | } |
e673927d | 291 | spin_unlock_irqrestore(&self->port.lock, flags); |
580d27b4 | 292 | self->port.blocked_open++; |
6819bc2e | 293 | |
1da177e4 LT |
294 | while (1) { |
295 | if (tty->termios->c_cflag & CBAUD) { | |
296 | /* Here, we use to lock those two guys, but | |
297 | * as ircomm_param_request() does it itself, | |
298 | * I don't see the point (and I see the deadlock). | |
299 | * Jean II */ | |
300 | self->settings.dte |= IRCOMM_RTS + IRCOMM_DTR; | |
6819bc2e | 301 | |
1da177e4 LT |
302 | ircomm_param_request(self, IRCOMM_DTE, TRUE); |
303 | } | |
6819bc2e | 304 | |
1da177e4 | 305 | current->state = TASK_INTERRUPTIBLE; |
6819bc2e | 306 | |
1da177e4 | 307 | if (tty_hung_up_p(filp) || |
849d5a99 JS |
308 | !test_bit(ASYNCB_INITIALIZED, &self->port.flags)) { |
309 | retval = (self->port.flags & ASYNC_HUP_NOTIFY) ? | |
1da177e4 LT |
310 | -EAGAIN : -ERESTARTSYS; |
311 | break; | |
312 | } | |
6819bc2e YH |
313 | |
314 | /* | |
1da177e4 LT |
315 | * Check if link is ready now. Even if CLOCAL is |
316 | * specified, we cannot return before the IrCOMM link is | |
6819bc2e | 317 | * ready |
1da177e4 | 318 | */ |
849d5a99 | 319 | if (!test_bit(ASYNCB_CLOSING, &self->port.flags) && |
6819bc2e | 320 | (do_clocal || (self->settings.dce & IRCOMM_CD)) && |
1da177e4 LT |
321 | self->state == IRCOMM_TTY_READY) |
322 | { | |
6819bc2e | 323 | break; |
1da177e4 | 324 | } |
6819bc2e | 325 | |
1da177e4 LT |
326 | if (signal_pending(current)) { |
327 | retval = -ERESTARTSYS; | |
328 | break; | |
329 | } | |
6819bc2e | 330 | |
1da177e4 | 331 | IRDA_DEBUG(1, "%s(%d):block_til_ready blocking on %s open_count=%d\n", |
580d27b4 | 332 | __FILE__, __LINE__, tty->driver->name, self->port.count); |
6819bc2e | 333 | |
1da177e4 LT |
334 | schedule(); |
335 | } | |
6819bc2e | 336 | |
1da177e4 | 337 | __set_current_state(TASK_RUNNING); |
a3cc9fcf | 338 | remove_wait_queue(&self->port.open_wait, &wait); |
6819bc2e | 339 | |
1da177e4 LT |
340 | if (extra_count) { |
341 | /* ++ is not atomic, so this should be protected - Jean II */ | |
e673927d | 342 | spin_lock_irqsave(&self->port.lock, flags); |
580d27b4 | 343 | self->port.count++; |
e673927d | 344 | spin_unlock_irqrestore(&self->port.lock, flags); |
1da177e4 | 345 | } |
580d27b4 | 346 | self->port.blocked_open--; |
6819bc2e | 347 | |
1da177e4 | 348 | IRDA_DEBUG(1, "%s(%d):block_til_ready after blocking on %s open_count=%d\n", |
580d27b4 | 349 | __FILE__, __LINE__, tty->driver->name, self->port.count); |
6819bc2e | 350 | |
1da177e4 | 351 | if (!retval) |
849d5a99 | 352 | self->port.flags |= ASYNC_NORMAL_ACTIVE; |
6819bc2e YH |
353 | |
354 | return retval; | |
1da177e4 LT |
355 | } |
356 | ||
357 | /* | |
358 | * Function ircomm_tty_open (tty, filp) | |
359 | * | |
360 | * This routine is called when a particular tty device is opened. This | |
361 | * routine is mandatory; if this routine is not filled in, the attempted | |
362 | * open will fail with ENODEV. | |
363 | */ | |
364 | static int ircomm_tty_open(struct tty_struct *tty, struct file *filp) | |
365 | { | |
366 | struct ircomm_tty_cb *self; | |
410235fd | 367 | unsigned int line = tty->index; |
1da177e4 LT |
368 | unsigned long flags; |
369 | int ret; | |
370 | ||
0dc47877 | 371 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 | 372 | |
1da177e4 LT |
373 | /* Check if instance already exists */ |
374 | self = hashbin_lock_find(ircomm_tty, line, NULL); | |
375 | if (!self) { | |
376 | /* No, so make new instance */ | |
0da974f4 | 377 | self = kzalloc(sizeof(struct ircomm_tty_cb), GFP_KERNEL); |
1da177e4 | 378 | if (self == NULL) { |
0dc47877 | 379 | IRDA_ERROR("%s(), kmalloc failed!\n", __func__); |
1da177e4 LT |
380 | return -ENOMEM; |
381 | } | |
6819bc2e | 382 | |
a3cc9fcf | 383 | tty_port_init(&self->port); |
1da177e4 LT |
384 | self->magic = IRCOMM_TTY_MAGIC; |
385 | self->flow = FLOW_STOP; | |
386 | ||
387 | self->line = line; | |
c4028958 | 388 | INIT_WORK(&self->tqueue, ircomm_tty_do_softint); |
1da177e4 LT |
389 | self->max_header_size = IRCOMM_TTY_HDR_UNINITIALISED; |
390 | self->max_data_size = IRCOMM_TTY_DATA_UNINITIALISED; | |
1da177e4 LT |
391 | |
392 | /* Init some important stuff */ | |
393 | init_timer(&self->watchdog_timer); | |
1da177e4 LT |
394 | spin_lock_init(&self->spinlock); |
395 | ||
6819bc2e | 396 | /* |
1da177e4 LT |
397 | * Force TTY into raw mode by default which is usually what |
398 | * we want for IrCOMM and IrLPT. This way applications will | |
6819bc2e | 399 | * not have to twiddle with printcap etc. |
ad36b88e AC |
400 | * |
401 | * Note this is completely usafe and doesn't work properly | |
1da177e4 LT |
402 | */ |
403 | tty->termios->c_iflag = 0; | |
404 | tty->termios->c_oflag = 0; | |
405 | ||
406 | /* Insert into hash */ | |
a3cc9fcf | 407 | /* FIXME there is a window from find to here */ |
1da177e4 LT |
408 | hashbin_insert(ircomm_tty, (irda_queue_t *) self, line, NULL); |
409 | } | |
410 | /* ++ is not atomic, so this should be protected - Jean II */ | |
e673927d | 411 | spin_lock_irqsave(&self->port.lock, flags); |
580d27b4 | 412 | self->port.count++; |
1da177e4 LT |
413 | |
414 | tty->driver_data = self; | |
415 | self->tty = tty; | |
e673927d | 416 | spin_unlock_irqrestore(&self->port.lock, flags); |
1da177e4 | 417 | |
0dc47877 | 418 | IRDA_DEBUG(1, "%s(), %s%d, count = %d\n", __func__ , tty->driver->name, |
580d27b4 | 419 | self->line, self->port.count); |
1da177e4 LT |
420 | |
421 | /* Not really used by us, but lets do it anyway */ | |
849d5a99 | 422 | tty->low_latency = (self->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0; |
1da177e4 LT |
423 | |
424 | /* | |
425 | * If the port is the middle of closing, bail out now | |
426 | */ | |
427 | if (tty_hung_up_p(filp) || | |
849d5a99 | 428 | test_bit(ASYNCB_CLOSING, &self->port.flags)) { |
1da177e4 LT |
429 | |
430 | /* Hm, why are we blocking on ASYNC_CLOSING if we | |
431 | * do return -EAGAIN/-ERESTARTSYS below anyway? | |
432 | * IMHO it's either not needed in the first place | |
433 | * or for some reason we need to make sure the async | |
434 | * closing has been finished - if so, wouldn't we | |
435 | * probably better sleep uninterruptible? | |
436 | */ | |
437 | ||
a3cc9fcf | 438 | if (wait_event_interruptible(self->port.close_wait, |
849d5a99 | 439 | !test_bit(ASYNCB_CLOSING, &self->port.flags))) { |
1da177e4 | 440 | IRDA_WARNING("%s - got signal while blocking on ASYNC_CLOSING!\n", |
0dc47877 | 441 | __func__); |
1da177e4 LT |
442 | return -ERESTARTSYS; |
443 | } | |
444 | ||
445 | #ifdef SERIAL_DO_RESTART | |
849d5a99 | 446 | return (self->port.flags & ASYNC_HUP_NOTIFY) ? |
a02cec21 | 447 | -EAGAIN : -ERESTARTSYS; |
1da177e4 LT |
448 | #else |
449 | return -EAGAIN; | |
450 | #endif | |
451 | } | |
452 | ||
453 | /* Check if this is a "normal" ircomm device, or an irlpt device */ | |
454 | if (line < 0x10) { | |
455 | self->service_type = IRCOMM_3_WIRE | IRCOMM_9_WIRE; | |
456 | self->settings.service_type = IRCOMM_9_WIRE; /* 9 wire as default */ | |
457 | /* Jan Kiszka -> add DSR/RI -> Conform to IrCOMM spec */ | |
458 | self->settings.dce = IRCOMM_CTS | IRCOMM_CD | IRCOMM_DSR | IRCOMM_RI; /* Default line settings */ | |
0dc47877 | 459 | IRDA_DEBUG(2, "%s(), IrCOMM device\n", __func__ ); |
1da177e4 | 460 | } else { |
0dc47877 | 461 | IRDA_DEBUG(2, "%s(), IrLPT device\n", __func__ ); |
1da177e4 LT |
462 | self->service_type = IRCOMM_3_WIRE_RAW; |
463 | self->settings.service_type = IRCOMM_3_WIRE_RAW; /* Default */ | |
464 | } | |
465 | ||
466 | ret = ircomm_tty_startup(self); | |
467 | if (ret) | |
468 | return ret; | |
469 | ||
470 | ret = ircomm_tty_block_til_ready(self, filp); | |
471 | if (ret) { | |
6819bc2e | 472 | IRDA_DEBUG(2, |
0dc47877 | 473 | "%s(), returning after block_til_ready with %d\n", __func__ , |
1da177e4 LT |
474 | ret); |
475 | ||
476 | return ret; | |
477 | } | |
478 | return 0; | |
479 | } | |
480 | ||
481 | /* | |
482 | * Function ircomm_tty_close (tty, filp) | |
483 | * | |
484 | * This routine is called when a particular tty device is closed. | |
485 | * | |
486 | */ | |
487 | static void ircomm_tty_close(struct tty_struct *tty, struct file *filp) | |
488 | { | |
489 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
490 | unsigned long flags; | |
491 | ||
0dc47877 | 492 | IRDA_DEBUG(0, "%s()\n", __func__ ); |
1da177e4 | 493 | |
1da177e4 LT |
494 | IRDA_ASSERT(self != NULL, return;); |
495 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
496 | ||
e673927d | 497 | spin_lock_irqsave(&self->port.lock, flags); |
1da177e4 LT |
498 | |
499 | if (tty_hung_up_p(filp)) { | |
e673927d | 500 | spin_unlock_irqrestore(&self->port.lock, flags); |
1da177e4 | 501 | |
0dc47877 | 502 | IRDA_DEBUG(0, "%s(), returning 1\n", __func__ ); |
1da177e4 LT |
503 | return; |
504 | } | |
505 | ||
580d27b4 | 506 | if ((tty->count == 1) && (self->port.count != 1)) { |
1da177e4 LT |
507 | /* |
508 | * Uh, oh. tty->count is 1, which means that the tty | |
509 | * structure will be freed. state->count should always | |
510 | * be one in these conditions. If it's greater than | |
511 | * one, we've got real problems, since it means the | |
512 | * serial port won't be shutdown. | |
513 | */ | |
514 | IRDA_DEBUG(0, "%s(), bad serial port count; " | |
0dc47877 | 515 | "tty->count is 1, state->count is %d\n", __func__ , |
580d27b4 JS |
516 | self->port.count); |
517 | self->port.count = 1; | |
1da177e4 LT |
518 | } |
519 | ||
580d27b4 | 520 | if (--self->port.count < 0) { |
1da177e4 | 521 | IRDA_ERROR("%s(), bad serial port count for ttys%d: %d\n", |
580d27b4 JS |
522 | __func__, self->line, self->port.count); |
523 | self->port.count = 0; | |
1da177e4 | 524 | } |
580d27b4 | 525 | if (self->port.count) { |
e673927d | 526 | spin_unlock_irqrestore(&self->port.lock, flags); |
1da177e4 | 527 | |
0dc47877 | 528 | IRDA_DEBUG(0, "%s(), open count > 0\n", __func__ ); |
1da177e4 LT |
529 | return; |
530 | } | |
531 | ||
849d5a99 | 532 | set_bit(ASYNCB_CLOSING, &self->port.flags); |
1da177e4 | 533 | |
e673927d | 534 | spin_unlock_irqrestore(&self->port.lock, flags); |
1da177e4 LT |
535 | |
536 | /* | |
6819bc2e | 537 | * Now we wait for the transmit buffer to clear; and we notify |
1da177e4 LT |
538 | * the line discipline to only process XON/XOFF characters. |
539 | */ | |
540 | tty->closing = 1; | |
2a0213cb JS |
541 | if (self->port.closing_wait != ASYNC_CLOSING_WAIT_NONE) |
542 | tty_wait_until_sent_from_close(tty, self->port.closing_wait); | |
1da177e4 LT |
543 | |
544 | ircomm_tty_shutdown(self); | |
545 | ||
f34d7a5b AC |
546 | tty_driver_flush_buffer(tty); |
547 | tty_ldisc_flush(tty); | |
1da177e4 | 548 | |
e673927d | 549 | spin_lock_irqsave(&self->port.lock, flags); |
1da177e4 LT |
550 | tty->closing = 0; |
551 | self->tty = NULL; | |
552 | ||
580d27b4 | 553 | if (self->port.blocked_open) { |
e673927d JS |
554 | if (self->port.close_delay) { |
555 | spin_unlock_irqrestore(&self->port.lock, flags); | |
2a0213cb | 556 | schedule_timeout_interruptible(self->port.close_delay); |
e673927d JS |
557 | spin_lock_irqsave(&self->port.lock, flags); |
558 | } | |
a3cc9fcf | 559 | wake_up_interruptible(&self->port.open_wait); |
1da177e4 LT |
560 | } |
561 | ||
849d5a99 | 562 | self->port.flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING); |
e673927d | 563 | spin_unlock_irqrestore(&self->port.lock, flags); |
a3cc9fcf | 564 | wake_up_interruptible(&self->port.close_wait); |
1da177e4 LT |
565 | } |
566 | ||
567 | /* | |
568 | * Function ircomm_tty_flush_buffer (tty) | |
569 | * | |
6819bc2e | 570 | * |
1da177e4 LT |
571 | * |
572 | */ | |
573 | static void ircomm_tty_flush_buffer(struct tty_struct *tty) | |
574 | { | |
575 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
576 | ||
577 | IRDA_ASSERT(self != NULL, return;); | |
578 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
579 | ||
6819bc2e YH |
580 | /* |
581 | * Let do_softint() do this to avoid race condition with | |
582 | * do_softint() ;-) | |
1da177e4 LT |
583 | */ |
584 | schedule_work(&self->tqueue); | |
585 | } | |
586 | ||
587 | /* | |
c4028958 | 588 | * Function ircomm_tty_do_softint (work) |
1da177e4 LT |
589 | * |
590 | * We use this routine to give the write wakeup to the user at at a | |
6819bc2e | 591 | * safe time (as fast as possible after write have completed). This |
1da177e4 LT |
592 | * can be compared to the Tx interrupt. |
593 | */ | |
c4028958 | 594 | static void ircomm_tty_do_softint(struct work_struct *work) |
1da177e4 | 595 | { |
c4028958 DH |
596 | struct ircomm_tty_cb *self = |
597 | container_of(work, struct ircomm_tty_cb, tqueue); | |
1da177e4 LT |
598 | struct tty_struct *tty; |
599 | unsigned long flags; | |
600 | struct sk_buff *skb, *ctrl_skb; | |
601 | ||
0dc47877 | 602 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 LT |
603 | |
604 | if (!self || self->magic != IRCOMM_TTY_MAGIC) | |
605 | return; | |
606 | ||
607 | tty = self->tty; | |
608 | if (!tty) | |
609 | return; | |
610 | ||
611 | /* Unlink control buffer */ | |
612 | spin_lock_irqsave(&self->spinlock, flags); | |
613 | ||
614 | ctrl_skb = self->ctrl_skb; | |
615 | self->ctrl_skb = NULL; | |
616 | ||
617 | spin_unlock_irqrestore(&self->spinlock, flags); | |
618 | ||
619 | /* Flush control buffer if any */ | |
620 | if(ctrl_skb) { | |
621 | if(self->flow == FLOW_START) | |
622 | ircomm_control_request(self->ircomm, ctrl_skb); | |
623 | /* Drop reference count - see ircomm_ttp_data_request(). */ | |
624 | dev_kfree_skb(ctrl_skb); | |
625 | } | |
626 | ||
627 | if (tty->hw_stopped) | |
628 | return; | |
629 | ||
630 | /* Unlink transmit buffer */ | |
631 | spin_lock_irqsave(&self->spinlock, flags); | |
6819bc2e | 632 | |
1da177e4 LT |
633 | skb = self->tx_skb; |
634 | self->tx_skb = NULL; | |
635 | ||
636 | spin_unlock_irqrestore(&self->spinlock, flags); | |
637 | ||
638 | /* Flush transmit buffer if any */ | |
639 | if (skb) { | |
640 | ircomm_tty_do_event(self, IRCOMM_TTY_DATA_REQUEST, skb, NULL); | |
641 | /* Drop reference count - see ircomm_ttp_data_request(). */ | |
642 | dev_kfree_skb(skb); | |
643 | } | |
6819bc2e | 644 | |
1da177e4 | 645 | /* Check if user (still) wants to be waken up */ |
a352def2 | 646 | tty_wakeup(tty); |
1da177e4 LT |
647 | } |
648 | ||
649 | /* | |
650 | * Function ircomm_tty_write (tty, buf, count) | |
651 | * | |
652 | * This routine is called by the kernel to write a series of characters | |
653 | * to the tty device. The characters may come from user space or kernel | |
654 | * space. This routine will return the number of characters actually | |
655 | * accepted for writing. This routine is mandatory. | |
656 | */ | |
657 | static int ircomm_tty_write(struct tty_struct *tty, | |
658 | const unsigned char *buf, int count) | |
659 | { | |
660 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
661 | unsigned long flags; | |
662 | struct sk_buff *skb; | |
663 | int tailroom = 0; | |
664 | int len = 0; | |
665 | int size; | |
666 | ||
0dc47877 | 667 | IRDA_DEBUG(2, "%s(), count=%d, hw_stopped=%d\n", __func__ , count, |
1da177e4 LT |
668 | tty->hw_stopped); |
669 | ||
670 | IRDA_ASSERT(self != NULL, return -1;); | |
671 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
672 | ||
673 | /* We may receive packets from the TTY even before we have finished | |
674 | * our setup. Not cool. | |
675 | * The problem is that we don't know the final header and data size | |
676 | * to create the proper skb, so any skb we would create would have | |
677 | * bogus header and data size, so need care. | |
678 | * We use a bogus header size to safely detect this condition. | |
679 | * Another problem is that hw_stopped was set to 0 way before it | |
680 | * should be, so we would drop this skb. It should now be fixed. | |
681 | * One option is to not accept data until we are properly setup. | |
682 | * But, I suspect that when it happens, the ppp line discipline | |
683 | * just "drops" the data, which might screw up connect scripts. | |
684 | * The second option is to create a "safe skb", with large header | |
685 | * and small size (see ircomm_tty_open() for values). | |
686 | * We just need to make sure that when the real values get filled, | |
687 | * we don't mess up the original "safe skb" (see tx_data_size). | |
688 | * Jean II */ | |
689 | if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) { | |
0dc47877 | 690 | IRDA_DEBUG(1, "%s() : not initialised\n", __func__); |
1da177e4 LT |
691 | #ifdef IRCOMM_NO_TX_BEFORE_INIT |
692 | /* We didn't consume anything, TTY will retry */ | |
693 | return 0; | |
694 | #endif | |
695 | } | |
696 | ||
697 | if (count < 1) | |
698 | return 0; | |
699 | ||
700 | /* Protect our manipulation of self->tx_skb and related */ | |
701 | spin_lock_irqsave(&self->spinlock, flags); | |
702 | ||
703 | /* Fetch current transmit buffer */ | |
704 | skb = self->tx_skb; | |
705 | ||
6819bc2e | 706 | /* |
1da177e4 LT |
707 | * Send out all the data we get, possibly as multiple fragmented |
708 | * frames, but this will only happen if the data is larger than the | |
709 | * max data size. The normal case however is just the opposite, and | |
710 | * this function may be called multiple times, and will then actually | |
6819bc2e | 711 | * defragment the data and send it out as one packet as soon as |
1da177e4 LT |
712 | * possible, but at a safer point in time |
713 | */ | |
714 | while (count) { | |
715 | size = count; | |
716 | ||
717 | /* Adjust data size to the max data size */ | |
718 | if (size > self->max_data_size) | |
719 | size = self->max_data_size; | |
6819bc2e YH |
720 | |
721 | /* | |
1da177e4 | 722 | * Do we already have a buffer ready for transmit, or do |
6819bc2e | 723 | * we need to allocate a new frame |
1da177e4 | 724 | */ |
6819bc2e YH |
725 | if (skb) { |
726 | /* | |
727 | * Any room for more data at the end of the current | |
1da177e4 | 728 | * transmit buffer? Cannot use skb_tailroom, since |
6819bc2e | 729 | * dev_alloc_skb gives us a larger skb than we |
1da177e4 LT |
730 | * requested |
731 | * Note : use tx_data_size, because max_data_size | |
732 | * may have changed and we don't want to overwrite | |
733 | * the skb. - Jean II | |
734 | */ | |
735 | if ((tailroom = (self->tx_data_size - skb->len)) > 0) { | |
736 | /* Adjust data to tailroom */ | |
737 | if (size > tailroom) | |
738 | size = tailroom; | |
739 | } else { | |
6819bc2e YH |
740 | /* |
741 | * Current transmit frame is full, so break | |
1da177e4 LT |
742 | * out, so we can send it as soon as possible |
743 | */ | |
744 | break; | |
745 | } | |
746 | } else { | |
747 | /* Prepare a full sized frame */ | |
485fb2c9 SO |
748 | skb = alloc_skb(self->max_data_size+ |
749 | self->max_header_size, | |
750 | GFP_ATOMIC); | |
1da177e4 LT |
751 | if (!skb) { |
752 | spin_unlock_irqrestore(&self->spinlock, flags); | |
753 | return -ENOBUFS; | |
754 | } | |
755 | skb_reserve(skb, self->max_header_size); | |
756 | self->tx_skb = skb; | |
757 | /* Remember skb size because max_data_size may | |
758 | * change later on - Jean II */ | |
759 | self->tx_data_size = self->max_data_size; | |
760 | } | |
761 | ||
762 | /* Copy data */ | |
763 | memcpy(skb_put(skb,size), buf + len, size); | |
764 | ||
765 | count -= size; | |
766 | len += size; | |
767 | } | |
768 | ||
769 | spin_unlock_irqrestore(&self->spinlock, flags); | |
770 | ||
6819bc2e | 771 | /* |
1da177e4 LT |
772 | * Schedule a new thread which will transmit the frame as soon |
773 | * as possible, but at a safe point in time. We do this so the | |
774 | * "user" can give us data multiple times, as PPP does (because of | |
775 | * its 256 byte tx buffer). We will then defragment and send out | |
6819bc2e | 776 | * all this data as one single packet. |
1da177e4 LT |
777 | */ |
778 | schedule_work(&self->tqueue); | |
6819bc2e | 779 | |
1da177e4 LT |
780 | return len; |
781 | } | |
782 | ||
783 | /* | |
784 | * Function ircomm_tty_write_room (tty) | |
785 | * | |
786 | * This routine returns the numbers of characters the tty driver will | |
787 | * accept for queuing to be written. This number is subject to change as | |
788 | * output buffers get emptied, or if the output flow control is acted. | |
789 | */ | |
790 | static int ircomm_tty_write_room(struct tty_struct *tty) | |
791 | { | |
792 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
793 | unsigned long flags; | |
794 | int ret; | |
795 | ||
796 | IRDA_ASSERT(self != NULL, return -1;); | |
797 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
798 | ||
799 | #ifdef IRCOMM_NO_TX_BEFORE_INIT | |
800 | /* max_header_size tells us if the channel is initialised or not. */ | |
801 | if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) | |
802 | /* Don't bother us yet */ | |
803 | return 0; | |
804 | #endif | |
805 | ||
806 | /* Check if we are allowed to transmit any data. | |
807 | * hw_stopped is the regular flow control. | |
808 | * Jean II */ | |
809 | if (tty->hw_stopped) | |
810 | ret = 0; | |
811 | else { | |
812 | spin_lock_irqsave(&self->spinlock, flags); | |
813 | if (self->tx_skb) | |
814 | ret = self->tx_data_size - self->tx_skb->len; | |
815 | else | |
816 | ret = self->max_data_size; | |
817 | spin_unlock_irqrestore(&self->spinlock, flags); | |
818 | } | |
0dc47877 | 819 | IRDA_DEBUG(2, "%s(), ret=%d\n", __func__ , ret); |
1da177e4 LT |
820 | |
821 | return ret; | |
822 | } | |
823 | ||
824 | /* | |
825 | * Function ircomm_tty_wait_until_sent (tty, timeout) | |
826 | * | |
827 | * This routine waits until the device has written out all of the | |
828 | * characters in its transmitter FIFO. | |
829 | */ | |
830 | static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout) | |
831 | { | |
832 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
833 | unsigned long orig_jiffies, poll_time; | |
834 | unsigned long flags; | |
6819bc2e | 835 | |
0dc47877 | 836 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 LT |
837 | |
838 | IRDA_ASSERT(self != NULL, return;); | |
839 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
840 | ||
841 | orig_jiffies = jiffies; | |
842 | ||
843 | /* Set poll time to 200 ms */ | |
844 | poll_time = IRDA_MIN(timeout, msecs_to_jiffies(200)); | |
845 | ||
846 | spin_lock_irqsave(&self->spinlock, flags); | |
847 | while (self->tx_skb && self->tx_skb->len) { | |
848 | spin_unlock_irqrestore(&self->spinlock, flags); | |
121caf57 | 849 | schedule_timeout_interruptible(poll_time); |
1da177e4 LT |
850 | spin_lock_irqsave(&self->spinlock, flags); |
851 | if (signal_pending(current)) | |
852 | break; | |
853 | if (timeout && time_after(jiffies, orig_jiffies + timeout)) | |
854 | break; | |
855 | } | |
856 | spin_unlock_irqrestore(&self->spinlock, flags); | |
857 | current->state = TASK_RUNNING; | |
858 | } | |
859 | ||
860 | /* | |
861 | * Function ircomm_tty_throttle (tty) | |
862 | * | |
863 | * This routine notifies the tty driver that input buffers for the line | |
864 | * discipline are close to full, and it should somehow signal that no | |
6819bc2e | 865 | * more characters should be sent to the tty. |
1da177e4 LT |
866 | */ |
867 | static void ircomm_tty_throttle(struct tty_struct *tty) | |
868 | { | |
869 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
870 | ||
0dc47877 | 871 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 LT |
872 | |
873 | IRDA_ASSERT(self != NULL, return;); | |
874 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
875 | ||
876 | /* Software flow control? */ | |
877 | if (I_IXOFF(tty)) | |
878 | ircomm_tty_send_xchar(tty, STOP_CHAR(tty)); | |
6819bc2e | 879 | |
1da177e4 LT |
880 | /* Hardware flow control? */ |
881 | if (tty->termios->c_cflag & CRTSCTS) { | |
882 | self->settings.dte &= ~IRCOMM_RTS; | |
883 | self->settings.dte |= IRCOMM_DELTA_RTS; | |
6819bc2e | 884 | |
1da177e4 LT |
885 | ircomm_param_request(self, IRCOMM_DTE, TRUE); |
886 | } | |
887 | ||
6819bc2e | 888 | ircomm_flow_request(self->ircomm, FLOW_STOP); |
1da177e4 LT |
889 | } |
890 | ||
891 | /* | |
892 | * Function ircomm_tty_unthrottle (tty) | |
893 | * | |
894 | * This routine notifies the tty drivers that it should signals that | |
895 | * characters can now be sent to the tty without fear of overrunning the | |
896 | * input buffers of the line disciplines. | |
897 | */ | |
898 | static void ircomm_tty_unthrottle(struct tty_struct *tty) | |
899 | { | |
900 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
901 | ||
0dc47877 | 902 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 LT |
903 | |
904 | IRDA_ASSERT(self != NULL, return;); | |
905 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
906 | ||
907 | /* Using software flow control? */ | |
908 | if (I_IXOFF(tty)) { | |
909 | ircomm_tty_send_xchar(tty, START_CHAR(tty)); | |
910 | } | |
911 | ||
912 | /* Using hardware flow control? */ | |
913 | if (tty->termios->c_cflag & CRTSCTS) { | |
914 | self->settings.dte |= (IRCOMM_RTS|IRCOMM_DELTA_RTS); | |
915 | ||
916 | ircomm_param_request(self, IRCOMM_DTE, TRUE); | |
0dc47877 | 917 | IRDA_DEBUG(1, "%s(), FLOW_START\n", __func__ ); |
1da177e4 | 918 | } |
6819bc2e | 919 | ircomm_flow_request(self->ircomm, FLOW_START); |
1da177e4 LT |
920 | } |
921 | ||
922 | /* | |
923 | * Function ircomm_tty_chars_in_buffer (tty) | |
924 | * | |
925 | * Indicates if there are any data in the buffer | |
926 | * | |
927 | */ | |
928 | static int ircomm_tty_chars_in_buffer(struct tty_struct *tty) | |
929 | { | |
930 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
931 | unsigned long flags; | |
932 | int len = 0; | |
933 | ||
934 | IRDA_ASSERT(self != NULL, return -1;); | |
935 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
936 | ||
937 | spin_lock_irqsave(&self->spinlock, flags); | |
938 | ||
939 | if (self->tx_skb) | |
940 | len = self->tx_skb->len; | |
941 | ||
942 | spin_unlock_irqrestore(&self->spinlock, flags); | |
943 | ||
944 | return len; | |
945 | } | |
946 | ||
947 | static void ircomm_tty_shutdown(struct ircomm_tty_cb *self) | |
948 | { | |
949 | unsigned long flags; | |
950 | ||
951 | IRDA_ASSERT(self != NULL, return;); | |
952 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
953 | ||
0dc47877 | 954 | IRDA_DEBUG(0, "%s()\n", __func__ ); |
1da177e4 | 955 | |
849d5a99 | 956 | if (!test_and_clear_bit(ASYNCB_INITIALIZED, &self->port.flags)) |
1da177e4 LT |
957 | return; |
958 | ||
959 | ircomm_tty_detach_cable(self); | |
960 | ||
961 | spin_lock_irqsave(&self->spinlock, flags); | |
962 | ||
963 | del_timer(&self->watchdog_timer); | |
6819bc2e | 964 | |
1da177e4 LT |
965 | /* Free parameter buffer */ |
966 | if (self->ctrl_skb) { | |
967 | dev_kfree_skb(self->ctrl_skb); | |
968 | self->ctrl_skb = NULL; | |
969 | } | |
970 | ||
971 | /* Free transmit buffer */ | |
972 | if (self->tx_skb) { | |
973 | dev_kfree_skb(self->tx_skb); | |
974 | self->tx_skb = NULL; | |
975 | } | |
976 | ||
977 | if (self->ircomm) { | |
978 | ircomm_close(self->ircomm); | |
979 | self->ircomm = NULL; | |
980 | } | |
981 | ||
982 | spin_unlock_irqrestore(&self->spinlock, flags); | |
983 | } | |
984 | ||
985 | /* | |
986 | * Function ircomm_tty_hangup (tty) | |
987 | * | |
988 | * This routine notifies the tty driver that it should hangup the tty | |
989 | * device. | |
6819bc2e | 990 | * |
1da177e4 LT |
991 | */ |
992 | static void ircomm_tty_hangup(struct tty_struct *tty) | |
993 | { | |
994 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
995 | unsigned long flags; | |
996 | ||
0dc47877 | 997 | IRDA_DEBUG(0, "%s()\n", __func__ ); |
1da177e4 LT |
998 | |
999 | IRDA_ASSERT(self != NULL, return;); | |
1000 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
1001 | ||
1da177e4 LT |
1002 | /* ircomm_tty_flush_buffer(tty); */ |
1003 | ircomm_tty_shutdown(self); | |
1004 | ||
e673927d | 1005 | spin_lock_irqsave(&self->port.lock, flags); |
849d5a99 | 1006 | self->port.flags &= ~ASYNC_NORMAL_ACTIVE; |
1da177e4 | 1007 | self->tty = NULL; |
580d27b4 | 1008 | self->port.count = 0; |
e673927d | 1009 | spin_unlock_irqrestore(&self->port.lock, flags); |
1da177e4 | 1010 | |
a3cc9fcf | 1011 | wake_up_interruptible(&self->port.open_wait); |
1da177e4 LT |
1012 | } |
1013 | ||
1014 | /* | |
1015 | * Function ircomm_tty_send_xchar (tty, ch) | |
1016 | * | |
1017 | * This routine is used to send a high-priority XON/XOFF character to | |
1018 | * the device. | |
1019 | */ | |
1020 | static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch) | |
1021 | { | |
0dc47877 | 1022 | IRDA_DEBUG(0, "%s(), not impl\n", __func__ ); |
1da177e4 LT |
1023 | } |
1024 | ||
1025 | /* | |
1026 | * Function ircomm_tty_start (tty) | |
1027 | * | |
1028 | * This routine notifies the tty driver that it resume sending | |
6819bc2e | 1029 | * characters to the tty device. |
1da177e4 LT |
1030 | */ |
1031 | void ircomm_tty_start(struct tty_struct *tty) | |
1032 | { | |
1033 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
1034 | ||
1035 | ircomm_flow_request(self->ircomm, FLOW_START); | |
1036 | } | |
1037 | ||
1038 | /* | |
1039 | * Function ircomm_tty_stop (tty) | |
1040 | * | |
1041 | * This routine notifies the tty driver that it should stop outputting | |
6819bc2e | 1042 | * characters to the tty device. |
1da177e4 | 1043 | */ |
6819bc2e | 1044 | static void ircomm_tty_stop(struct tty_struct *tty) |
1da177e4 LT |
1045 | { |
1046 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
1047 | ||
1048 | IRDA_ASSERT(self != NULL, return;); | |
1049 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
1050 | ||
1051 | ircomm_flow_request(self->ircomm, FLOW_STOP); | |
1052 | } | |
1053 | ||
1054 | /* | |
1055 | * Function ircomm_check_modem_status (self) | |
1056 | * | |
1057 | * Check for any changes in the DCE's line settings. This function should | |
1058 | * be called whenever the dce parameter settings changes, to update the | |
1059 | * flow control settings and other things | |
1060 | */ | |
1061 | void ircomm_tty_check_modem_status(struct ircomm_tty_cb *self) | |
1062 | { | |
1063 | struct tty_struct *tty; | |
1064 | int status; | |
1065 | ||
0dc47877 | 1066 | IRDA_DEBUG(0, "%s()\n", __func__ ); |
1da177e4 LT |
1067 | |
1068 | IRDA_ASSERT(self != NULL, return;); | |
1069 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
1070 | ||
1071 | tty = self->tty; | |
1072 | ||
1073 | status = self->settings.dce; | |
1074 | ||
1075 | if (status & IRCOMM_DCE_DELTA_ANY) { | |
1076 | /*wake_up_interruptible(&self->delta_msr_wait);*/ | |
1077 | } | |
849d5a99 | 1078 | if ((self->port.flags & ASYNC_CHECK_CD) && (status & IRCOMM_DELTA_CD)) { |
6819bc2e | 1079 | IRDA_DEBUG(2, |
0dc47877 | 1080 | "%s(), ircomm%d CD now %s...\n", __func__ , self->line, |
1da177e4 LT |
1081 | (status & IRCOMM_CD) ? "on" : "off"); |
1082 | ||
1083 | if (status & IRCOMM_CD) { | |
a3cc9fcf | 1084 | wake_up_interruptible(&self->port.open_wait); |
1da177e4 | 1085 | } else { |
6819bc2e | 1086 | IRDA_DEBUG(2, |
0dc47877 | 1087 | "%s(), Doing serial hangup..\n", __func__ ); |
1da177e4 LT |
1088 | if (tty) |
1089 | tty_hangup(tty); | |
1090 | ||
1091 | /* Hangup will remote the tty, so better break out */ | |
1092 | return; | |
1093 | } | |
1094 | } | |
849d5a99 | 1095 | if (self->port.flags & ASYNC_CTS_FLOW) { |
1da177e4 LT |
1096 | if (tty->hw_stopped) { |
1097 | if (status & IRCOMM_CTS) { | |
6819bc2e | 1098 | IRDA_DEBUG(2, |
0dc47877 | 1099 | "%s(), CTS tx start...\n", __func__ ); |
1da177e4 | 1100 | tty->hw_stopped = 0; |
6819bc2e | 1101 | |
1da177e4 | 1102 | /* Wake up processes blocked on open */ |
a3cc9fcf | 1103 | wake_up_interruptible(&self->port.open_wait); |
1da177e4 LT |
1104 | |
1105 | schedule_work(&self->tqueue); | |
1106 | return; | |
1107 | } | |
1108 | } else { | |
1109 | if (!(status & IRCOMM_CTS)) { | |
6819bc2e | 1110 | IRDA_DEBUG(2, |
0dc47877 | 1111 | "%s(), CTS tx stop...\n", __func__ ); |
1da177e4 LT |
1112 | tty->hw_stopped = 1; |
1113 | } | |
1114 | } | |
1115 | } | |
1116 | } | |
1117 | ||
1118 | /* | |
1119 | * Function ircomm_tty_data_indication (instance, sap, skb) | |
1120 | * | |
1121 | * Handle incoming data, and deliver it to the line discipline | |
1122 | * | |
1123 | */ | |
1124 | static int ircomm_tty_data_indication(void *instance, void *sap, | |
1125 | struct sk_buff *skb) | |
1126 | { | |
1127 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; | |
1128 | ||
0dc47877 | 1129 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
6819bc2e | 1130 | |
1da177e4 LT |
1131 | IRDA_ASSERT(self != NULL, return -1;); |
1132 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
1133 | IRDA_ASSERT(skb != NULL, return -1;); | |
1134 | ||
1135 | if (!self->tty) { | |
0dc47877 | 1136 | IRDA_DEBUG(0, "%s(), no tty!\n", __func__ ); |
1da177e4 LT |
1137 | return 0; |
1138 | } | |
1139 | ||
6819bc2e | 1140 | /* |
1da177e4 LT |
1141 | * If we receive data when hardware is stopped then something is wrong. |
1142 | * We try to poll the peers line settings to check if we are up todate. | |
6819bc2e | 1143 | * Devices like WinCE can do this, and since they don't send any |
1da177e4 LT |
1144 | * params, we can just as well declare the hardware for running. |
1145 | */ | |
1146 | if (self->tty->hw_stopped && (self->flow == FLOW_START)) { | |
0dc47877 | 1147 | IRDA_DEBUG(0, "%s(), polling for line settings!\n", __func__ ); |
1da177e4 LT |
1148 | ircomm_param_request(self, IRCOMM_POLL, TRUE); |
1149 | ||
1150 | /* We can just as well declare the hardware for running */ | |
1151 | ircomm_tty_send_initial_parameters(self); | |
1152 | ircomm_tty_link_established(self); | |
1153 | } | |
1154 | ||
6819bc2e | 1155 | /* |
cbfd1526 AV |
1156 | * Use flip buffer functions since the code may be called from interrupt |
1157 | * context | |
1da177e4 | 1158 | */ |
cbfd1526 AV |
1159 | tty_insert_flip_string(self->tty, skb->data, skb->len); |
1160 | tty_flip_buffer_push(self->tty); | |
1da177e4 LT |
1161 | |
1162 | /* No need to kfree_skb - see ircomm_ttp_data_indication() */ | |
1163 | ||
1164 | return 0; | |
1165 | } | |
1166 | ||
1167 | /* | |
1168 | * Function ircomm_tty_control_indication (instance, sap, skb) | |
1169 | * | |
1170 | * Parse all incoming parameters (easy!) | |
1171 | * | |
1172 | */ | |
1173 | static int ircomm_tty_control_indication(void *instance, void *sap, | |
1174 | struct sk_buff *skb) | |
1175 | { | |
1176 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; | |
1177 | int clen; | |
1178 | ||
0dc47877 | 1179 | IRDA_DEBUG(4, "%s()\n", __func__ ); |
6819bc2e | 1180 | |
1da177e4 LT |
1181 | IRDA_ASSERT(self != NULL, return -1;); |
1182 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
1183 | IRDA_ASSERT(skb != NULL, return -1;); | |
1184 | ||
1185 | clen = skb->data[0]; | |
1186 | ||
6819bc2e | 1187 | irda_param_extract_all(self, skb->data+1, IRDA_MIN(skb->len-1, clen), |
1da177e4 LT |
1188 | &ircomm_param_info); |
1189 | ||
1190 | /* No need to kfree_skb - see ircomm_control_indication() */ | |
1191 | ||
1192 | return 0; | |
1193 | } | |
1194 | ||
1195 | /* | |
1196 | * Function ircomm_tty_flow_indication (instance, sap, cmd) | |
1197 | * | |
1198 | * This function is called by IrTTP when it wants us to slow down the | |
1199 | * transmission of data. We just mark the hardware as stopped, and wait | |
1200 | * for IrTTP to notify us that things are OK again. | |
1201 | */ | |
6819bc2e | 1202 | static void ircomm_tty_flow_indication(void *instance, void *sap, |
1da177e4 LT |
1203 | LOCAL_FLOW cmd) |
1204 | { | |
1205 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; | |
1206 | struct tty_struct *tty; | |
1207 | ||
1208 | IRDA_ASSERT(self != NULL, return;); | |
1209 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
1210 | ||
1211 | tty = self->tty; | |
1212 | ||
1213 | switch (cmd) { | |
1214 | case FLOW_START: | |
0dc47877 | 1215 | IRDA_DEBUG(2, "%s(), hw start!\n", __func__ ); |
1da177e4 LT |
1216 | tty->hw_stopped = 0; |
1217 | ||
1218 | /* ircomm_tty_do_softint will take care of the rest */ | |
1219 | schedule_work(&self->tqueue); | |
1220 | break; | |
1221 | default: /* If we get here, something is very wrong, better stop */ | |
1222 | case FLOW_STOP: | |
0dc47877 | 1223 | IRDA_DEBUG(2, "%s(), hw stopped!\n", __func__ ); |
1da177e4 LT |
1224 | tty->hw_stopped = 1; |
1225 | break; | |
1226 | } | |
1227 | self->flow = cmd; | |
1228 | } | |
1229 | ||
92b05e13 | 1230 | #ifdef CONFIG_PROC_FS |
3d304176 | 1231 | static void ircomm_tty_line_info(struct ircomm_tty_cb *self, struct seq_file *m) |
1da177e4 | 1232 | { |
3d304176 | 1233 | char sep; |
1da177e4 | 1234 | |
3d304176 | 1235 | seq_printf(m, "State: %s\n", ircomm_tty_state[self->state]); |
1da177e4 | 1236 | |
3d304176 | 1237 | seq_puts(m, "Service type: "); |
1da177e4 | 1238 | if (self->service_type & IRCOMM_9_WIRE) |
3d304176 | 1239 | seq_puts(m, "9_WIRE"); |
1da177e4 | 1240 | else if (self->service_type & IRCOMM_3_WIRE) |
3d304176 | 1241 | seq_puts(m, "3_WIRE"); |
1da177e4 | 1242 | else if (self->service_type & IRCOMM_3_WIRE_RAW) |
3d304176 | 1243 | seq_puts(m, "3_WIRE_RAW"); |
1da177e4 | 1244 | else |
3d304176 AD |
1245 | seq_puts(m, "No common service type!\n"); |
1246 | seq_putc(m, '\n'); | |
1247 | ||
1248 | seq_printf(m, "Port name: %s\n", self->settings.port_name); | |
1249 | ||
1250 | seq_printf(m, "DTE status:"); | |
1251 | sep = ' '; | |
1252 | if (self->settings.dte & IRCOMM_RTS) { | |
1253 | seq_printf(m, "%cRTS", sep); | |
1254 | sep = '|'; | |
1255 | } | |
1256 | if (self->settings.dte & IRCOMM_DTR) { | |
1257 | seq_printf(m, "%cDTR", sep); | |
1258 | sep = '|'; | |
1259 | } | |
1260 | seq_putc(m, '\n'); | |
1261 | ||
1262 | seq_puts(m, "DCE status:"); | |
1263 | sep = ' '; | |
1264 | if (self->settings.dce & IRCOMM_CTS) { | |
1265 | seq_printf(m, "%cCTS", sep); | |
1266 | sep = '|'; | |
1267 | } | |
1268 | if (self->settings.dce & IRCOMM_DSR) { | |
1269 | seq_printf(m, "%cDSR", sep); | |
1270 | sep = '|'; | |
1271 | } | |
1272 | if (self->settings.dce & IRCOMM_CD) { | |
1273 | seq_printf(m, "%cCD", sep); | |
1274 | sep = '|'; | |
1275 | } | |
1276 | if (self->settings.dce & IRCOMM_RI) { | |
1277 | seq_printf(m, "%cRI", sep); | |
1278 | sep = '|'; | |
1279 | } | |
1280 | seq_putc(m, '\n'); | |
1281 | ||
1282 | seq_puts(m, "Configuration: "); | |
1da177e4 | 1283 | if (!self->settings.null_modem) |
3d304176 | 1284 | seq_puts(m, "DTE <-> DCE\n"); |
1da177e4 | 1285 | else |
3d304176 AD |
1286 | seq_puts(m, "DTE <-> DTE (null modem emulation)\n"); |
1287 | ||
1288 | seq_printf(m, "Data rate: %d\n", self->settings.data_rate); | |
1289 | ||
1290 | seq_puts(m, "Flow control:"); | |
1291 | sep = ' '; | |
1292 | if (self->settings.flow_control & IRCOMM_XON_XOFF_IN) { | |
1293 | seq_printf(m, "%cXON_XOFF_IN", sep); | |
1294 | sep = '|'; | |
1295 | } | |
1296 | if (self->settings.flow_control & IRCOMM_XON_XOFF_OUT) { | |
1297 | seq_printf(m, "%cXON_XOFF_OUT", sep); | |
1298 | sep = '|'; | |
1299 | } | |
1300 | if (self->settings.flow_control & IRCOMM_RTS_CTS_IN) { | |
1301 | seq_printf(m, "%cRTS_CTS_IN", sep); | |
1302 | sep = '|'; | |
1303 | } | |
1304 | if (self->settings.flow_control & IRCOMM_RTS_CTS_OUT) { | |
1305 | seq_printf(m, "%cRTS_CTS_OUT", sep); | |
1306 | sep = '|'; | |
1307 | } | |
1308 | if (self->settings.flow_control & IRCOMM_DSR_DTR_IN) { | |
1309 | seq_printf(m, "%cDSR_DTR_IN", sep); | |
1310 | sep = '|'; | |
1311 | } | |
1312 | if (self->settings.flow_control & IRCOMM_DSR_DTR_OUT) { | |
1313 | seq_printf(m, "%cDSR_DTR_OUT", sep); | |
1314 | sep = '|'; | |
1315 | } | |
1316 | if (self->settings.flow_control & IRCOMM_ENQ_ACK_IN) { | |
1317 | seq_printf(m, "%cENQ_ACK_IN", sep); | |
1318 | sep = '|'; | |
1319 | } | |
1320 | if (self->settings.flow_control & IRCOMM_ENQ_ACK_OUT) { | |
1321 | seq_printf(m, "%cENQ_ACK_OUT", sep); | |
1322 | sep = '|'; | |
1323 | } | |
1324 | seq_putc(m, '\n'); | |
1325 | ||
1326 | seq_puts(m, "Flags:"); | |
1327 | sep = ' '; | |
849d5a99 | 1328 | if (self->port.flags & ASYNC_CTS_FLOW) { |
3d304176 AD |
1329 | seq_printf(m, "%cASYNC_CTS_FLOW", sep); |
1330 | sep = '|'; | |
1331 | } | |
849d5a99 | 1332 | if (self->port.flags & ASYNC_CHECK_CD) { |
3d304176 AD |
1333 | seq_printf(m, "%cASYNC_CHECK_CD", sep); |
1334 | sep = '|'; | |
1335 | } | |
849d5a99 | 1336 | if (self->port.flags & ASYNC_INITIALIZED) { |
3d304176 AD |
1337 | seq_printf(m, "%cASYNC_INITIALIZED", sep); |
1338 | sep = '|'; | |
1339 | } | |
849d5a99 | 1340 | if (self->port.flags & ASYNC_LOW_LATENCY) { |
3d304176 AD |
1341 | seq_printf(m, "%cASYNC_LOW_LATENCY", sep); |
1342 | sep = '|'; | |
1343 | } | |
849d5a99 | 1344 | if (self->port.flags & ASYNC_CLOSING) { |
3d304176 AD |
1345 | seq_printf(m, "%cASYNC_CLOSING", sep); |
1346 | sep = '|'; | |
1347 | } | |
849d5a99 | 1348 | if (self->port.flags & ASYNC_NORMAL_ACTIVE) { |
3d304176 AD |
1349 | seq_printf(m, "%cASYNC_NORMAL_ACTIVE", sep); |
1350 | sep = '|'; | |
1351 | } | |
1352 | seq_putc(m, '\n'); | |
1353 | ||
1354 | seq_printf(m, "Role: %s\n", self->client ? "client" : "server"); | |
580d27b4 | 1355 | seq_printf(m, "Open count: %d\n", self->port.count); |
3d304176 AD |
1356 | seq_printf(m, "Max data size: %d\n", self->max_data_size); |
1357 | seq_printf(m, "Max header size: %d\n", self->max_header_size); | |
6819bc2e | 1358 | |
1da177e4 | 1359 | if (self->tty) |
3d304176 | 1360 | seq_printf(m, "Hardware: %s\n", |
1da177e4 | 1361 | self->tty->hw_stopped ? "Stopped" : "Running"); |
1da177e4 LT |
1362 | } |
1363 | ||
3d304176 | 1364 | static int ircomm_tty_proc_show(struct seq_file *m, void *v) |
1da177e4 LT |
1365 | { |
1366 | struct ircomm_tty_cb *self; | |
1da177e4 LT |
1367 | unsigned long flags; |
1368 | ||
1369 | spin_lock_irqsave(&ircomm_tty->hb_spinlock, flags); | |
1370 | ||
1371 | self = (struct ircomm_tty_cb *) hashbin_get_first(ircomm_tty); | |
3d304176 | 1372 | while (self != NULL) { |
1da177e4 LT |
1373 | if (self->magic != IRCOMM_TTY_MAGIC) |
1374 | break; | |
1375 | ||
3d304176 | 1376 | ircomm_tty_line_info(self, m); |
1da177e4 | 1377 | self = (struct ircomm_tty_cb *) hashbin_get_next(ircomm_tty); |
6819bc2e | 1378 | } |
1da177e4 | 1379 | spin_unlock_irqrestore(&ircomm_tty->hb_spinlock, flags); |
3d304176 AD |
1380 | return 0; |
1381 | } | |
1da177e4 | 1382 | |
3d304176 AD |
1383 | static int ircomm_tty_proc_open(struct inode *inode, struct file *file) |
1384 | { | |
1385 | return single_open(file, ircomm_tty_proc_show, NULL); | |
1da177e4 | 1386 | } |
3d304176 AD |
1387 | |
1388 | static const struct file_operations ircomm_tty_proc_fops = { | |
1389 | .owner = THIS_MODULE, | |
1390 | .open = ircomm_tty_proc_open, | |
1391 | .read = seq_read, | |
1392 | .llseek = seq_lseek, | |
1393 | .release = single_release, | |
1394 | }; | |
1da177e4 LT |
1395 | #endif /* CONFIG_PROC_FS */ |
1396 | ||
1397 | MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>"); | |
1398 | MODULE_DESCRIPTION("IrCOMM serial TTY driver"); | |
1399 | MODULE_LICENSE("GPL"); | |
1400 | MODULE_ALIAS_CHARDEV_MAJOR(IRCOMM_TTY_MAJOR); | |
1401 | ||
1402 | module_init(ircomm_tty_init); | |
1403 | module_exit(ircomm_tty_cleanup); |