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 | |
d3770509 | 27 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
6819bc2e | 28 | * |
1da177e4 LT |
29 | ********************************************************************/ |
30 | ||
1da177e4 LT |
31 | #include <linux/init.h> |
32 | #include <linux/module.h> | |
33 | #include <linux/fs.h> | |
5a0e3ad6 | 34 | #include <linux/slab.h> |
1da177e4 | 35 | #include <linux/sched.h> |
3d304176 | 36 | #include <linux/seq_file.h> |
1da177e4 LT |
37 | #include <linux/termios.h> |
38 | #include <linux/tty.h> | |
cbfd1526 | 39 | #include <linux/tty_flip.h> |
1da177e4 LT |
40 | #include <linux/interrupt.h> |
41 | #include <linux/device.h> /* for MODULE_ALIAS_CHARDEV_MAJOR */ | |
42 | ||
43 | #include <asm/uaccess.h> | |
44 | ||
45 | #include <net/irda/irda.h> | |
46 | #include <net/irda/irmod.h> | |
47 | ||
48 | #include <net/irda/ircomm_core.h> | |
49 | #include <net/irda/ircomm_param.h> | |
50 | #include <net/irda/ircomm_tty_attach.h> | |
51 | #include <net/irda/ircomm_tty.h> | |
52 | ||
9c650ffc JS |
53 | static int ircomm_tty_install(struct tty_driver *driver, |
54 | struct tty_struct *tty); | |
1da177e4 LT |
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 = { |
9c650ffc | 85 | .install = ircomm_tty_install, |
1da177e4 LT |
86 | .open = ircomm_tty_open, |
87 | .close = ircomm_tty_close, | |
88 | .write = ircomm_tty_write, | |
89 | .write_room = ircomm_tty_write_room, | |
90 | .chars_in_buffer = ircomm_tty_chars_in_buffer, | |
91 | .flush_buffer = ircomm_tty_flush_buffer, | |
92 | .ioctl = ircomm_tty_ioctl, /* ircomm_tty_ioctl.c */ | |
93 | .tiocmget = ircomm_tty_tiocmget, /* ircomm_tty_ioctl.c */ | |
94 | .tiocmset = ircomm_tty_tiocmset, /* ircomm_tty_ioctl.c */ | |
95 | .throttle = ircomm_tty_throttle, | |
96 | .unthrottle = ircomm_tty_unthrottle, | |
97 | .send_xchar = ircomm_tty_send_xchar, | |
98 | .set_termios = ircomm_tty_set_termios, | |
99 | .stop = ircomm_tty_stop, | |
100 | .start = ircomm_tty_start, | |
101 | .hangup = ircomm_tty_hangup, | |
102 | .wait_until_sent = ircomm_tty_wait_until_sent, | |
103 | #ifdef CONFIG_PROC_FS | |
3d304176 | 104 | .proc_fops = &ircomm_tty_proc_fops, |
1da177e4 LT |
105 | #endif /* CONFIG_PROC_FS */ |
106 | }; | |
107 | ||
0ba9ff84 JS |
108 | static void ircomm_port_raise_dtr_rts(struct tty_port *port, int raise) |
109 | { | |
110 | struct ircomm_tty_cb *self = container_of(port, struct ircomm_tty_cb, | |
111 | port); | |
112 | /* | |
113 | * Here, we use to lock those two guys, but as ircomm_param_request() | |
114 | * does it itself, I don't see the point (and I see the deadlock). | |
115 | * Jean II | |
116 | */ | |
117 | if (raise) | |
118 | self->settings.dte |= IRCOMM_RTS | IRCOMM_DTR; | |
119 | else | |
120 | self->settings.dte &= ~(IRCOMM_RTS | IRCOMM_DTR); | |
121 | ||
122 | ircomm_param_request(self, IRCOMM_DTE, TRUE); | |
123 | } | |
124 | ||
125 | static int ircomm_port_carrier_raised(struct tty_port *port) | |
126 | { | |
127 | struct ircomm_tty_cb *self = container_of(port, struct ircomm_tty_cb, | |
128 | port); | |
129 | return self->settings.dce & IRCOMM_CD; | |
130 | } | |
131 | ||
132 | static const struct tty_port_operations ircomm_port_ops = { | |
133 | .dtr_rts = ircomm_port_raise_dtr_rts, | |
134 | .carrier_raised = ircomm_port_carrier_raised, | |
135 | }; | |
136 | ||
1da177e4 LT |
137 | /* |
138 | * Function ircomm_tty_init() | |
139 | * | |
140 | * Init IrCOMM TTY layer/driver | |
141 | * | |
142 | */ | |
143 | static int __init ircomm_tty_init(void) | |
144 | { | |
145 | driver = alloc_tty_driver(IRCOMM_TTY_PORTS); | |
146 | if (!driver) | |
147 | return -ENOMEM; | |
6819bc2e | 148 | ircomm_tty = hashbin_new(HB_LOCK); |
1da177e4 | 149 | if (ircomm_tty == NULL) { |
6c91023d JP |
150 | net_err_ratelimited("%s(), can't allocate hashbin!\n", |
151 | __func__); | |
1da177e4 LT |
152 | put_tty_driver(driver); |
153 | return -ENOMEM; | |
154 | } | |
155 | ||
1da177e4 LT |
156 | driver->driver_name = "ircomm"; |
157 | driver->name = "ircomm"; | |
1da177e4 LT |
158 | driver->major = IRCOMM_TTY_MAJOR; |
159 | driver->minor_start = IRCOMM_TTY_MINOR; | |
160 | driver->type = TTY_DRIVER_TYPE_SERIAL; | |
161 | driver->subtype = SERIAL_TYPE_NORMAL; | |
162 | driver->init_termios = tty_std_termios; | |
163 | driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; | |
164 | driver->flags = TTY_DRIVER_REAL_RAW; | |
165 | tty_set_operations(driver, &ops); | |
166 | if (tty_register_driver(driver)) { | |
6c91023d JP |
167 | net_err_ratelimited("%s(): Couldn't register serial driver\n", |
168 | __func__); | |
1da177e4 LT |
169 | put_tty_driver(driver); |
170 | return -1; | |
171 | } | |
172 | return 0; | |
173 | } | |
174 | ||
175 | static void __exit __ircomm_tty_cleanup(struct ircomm_tty_cb *self) | |
176 | { | |
0dc47877 | 177 | IRDA_DEBUG(0, "%s()\n", __func__ ); |
1da177e4 LT |
178 | |
179 | IRDA_ASSERT(self != NULL, return;); | |
180 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
181 | ||
182 | ircomm_tty_shutdown(self); | |
183 | ||
184 | self->magic = 0; | |
191c5f10 | 185 | tty_port_destroy(&self->port); |
1da177e4 LT |
186 | kfree(self); |
187 | } | |
188 | ||
189 | /* | |
190 | * Function ircomm_tty_cleanup () | |
191 | * | |
192 | * Remove IrCOMM TTY layer/driver | |
193 | * | |
194 | */ | |
195 | static void __exit ircomm_tty_cleanup(void) | |
196 | { | |
197 | int ret; | |
198 | ||
0dc47877 | 199 | IRDA_DEBUG(4, "%s()\n", __func__ ); |
1da177e4 LT |
200 | |
201 | ret = tty_unregister_driver(driver); | |
6819bc2e | 202 | if (ret) { |
6c91023d JP |
203 | net_err_ratelimited("%s(), failed to unregister driver\n", |
204 | __func__); | |
1da177e4 LT |
205 | return; |
206 | } | |
207 | ||
208 | hashbin_delete(ircomm_tty, (FREE_FUNC) __ircomm_tty_cleanup); | |
209 | put_tty_driver(driver); | |
210 | } | |
211 | ||
212 | /* | |
213 | * Function ircomm_startup (self) | |
214 | * | |
6819bc2e | 215 | * |
1da177e4 LT |
216 | * |
217 | */ | |
218 | static int ircomm_tty_startup(struct ircomm_tty_cb *self) | |
219 | { | |
220 | notify_t notify; | |
221 | int ret = -ENODEV; | |
222 | ||
0dc47877 | 223 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 LT |
224 | |
225 | IRDA_ASSERT(self != NULL, return -1;); | |
226 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
227 | ||
228 | /* Check if already open */ | |
849d5a99 | 229 | if (test_and_set_bit(ASYNCB_INITIALIZED, &self->port.flags)) { |
0dc47877 | 230 | IRDA_DEBUG(2, "%s(), already open so break out!\n", __func__ ); |
1da177e4 LT |
231 | return 0; |
232 | } | |
233 | ||
234 | /* Register with IrCOMM */ | |
235 | irda_notify_init(¬ify); | |
236 | /* These callbacks we must handle ourselves */ | |
237 | notify.data_indication = ircomm_tty_data_indication; | |
238 | notify.udata_indication = ircomm_tty_control_indication; | |
6819bc2e | 239 | notify.flow_indication = ircomm_tty_flow_indication; |
1da177e4 LT |
240 | |
241 | /* Use the ircomm_tty interface for these ones */ | |
6819bc2e | 242 | notify.disconnect_indication = ircomm_tty_disconnect_indication; |
1da177e4 | 243 | notify.connect_confirm = ircomm_tty_connect_confirm; |
6819bc2e | 244 | notify.connect_indication = ircomm_tty_connect_indication; |
1da177e4 LT |
245 | strlcpy(notify.name, "ircomm_tty", sizeof(notify.name)); |
246 | notify.instance = self; | |
247 | ||
248 | if (!self->ircomm) { | |
6819bc2e | 249 | self->ircomm = ircomm_open(¬ify, self->service_type, |
1da177e4 LT |
250 | self->line); |
251 | } | |
252 | if (!self->ircomm) | |
253 | goto err; | |
254 | ||
255 | self->slsap_sel = self->ircomm->slsap_sel; | |
256 | ||
257 | /* Connect IrCOMM link with remote device */ | |
258 | ret = ircomm_tty_attach_cable(self); | |
259 | if (ret < 0) { | |
6c91023d | 260 | net_err_ratelimited("%s(), error attaching cable!\n", __func__); |
1da177e4 LT |
261 | goto err; |
262 | } | |
263 | ||
264 | return 0; | |
265 | err: | |
849d5a99 | 266 | clear_bit(ASYNCB_INITIALIZED, &self->port.flags); |
1da177e4 LT |
267 | return ret; |
268 | } | |
269 | ||
270 | /* | |
271 | * Function ircomm_block_til_ready (self, filp) | |
272 | * | |
6819bc2e | 273 | * |
1da177e4 LT |
274 | * |
275 | */ | |
6819bc2e | 276 | static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self, |
62f228ac | 277 | struct tty_struct *tty, struct file *filp) |
1da177e4 | 278 | { |
38c58032 | 279 | struct tty_port *port = &self->port; |
1da177e4 LT |
280 | DECLARE_WAITQUEUE(wait, current); |
281 | int retval; | |
a4ed2e73 | 282 | int do_clocal = 0; |
1da177e4 | 283 | unsigned long flags; |
6819bc2e | 284 | |
0dc47877 | 285 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 | 286 | |
1da177e4 LT |
287 | /* |
288 | * If non-blocking mode is set, or the port is not enabled, | |
289 | * then make the check up front and then exit. | |
6819bc2e | 290 | */ |
f74861ca PH |
291 | if (test_bit(TTY_IO_ERROR, &tty->flags)) { |
292 | port->flags |= ASYNC_NORMAL_ACTIVE; | |
293 | return 0; | |
294 | } | |
295 | ||
296 | if (filp->f_flags & O_NONBLOCK) { | |
297 | /* nonblock mode is set */ | |
298 | if (tty->termios.c_cflag & CBAUD) | |
299 | tty_port_raise_dtr_rts(port); | |
38c58032 | 300 | port->flags |= ASYNC_NORMAL_ACTIVE; |
0dc47877 | 301 | IRDA_DEBUG(1, "%s(), O_NONBLOCK requested!\n", __func__ ); |
1da177e4 LT |
302 | return 0; |
303 | } | |
304 | ||
adc8d746 | 305 | if (tty->termios.c_cflag & CLOCAL) { |
0dc47877 | 306 | IRDA_DEBUG(1, "%s(), doing CLOCAL!\n", __func__ ); |
1da177e4 LT |
307 | do_clocal = 1; |
308 | } | |
6819bc2e | 309 | |
1da177e4 LT |
310 | /* Wait for carrier detect and the line to become |
311 | * free (i.e., not in use by the callout). While we are in | |
38c58032 | 312 | * this loop, port->count is dropped by one, so that |
1da177e4 LT |
313 | * mgsl_close() knows when to free things. We restore it upon |
314 | * exit, either normal or abnormal. | |
315 | */ | |
6819bc2e | 316 | |
1da177e4 | 317 | retval = 0; |
38c58032 | 318 | add_wait_queue(&port->open_wait, &wait); |
6819bc2e | 319 | |
1da177e4 | 320 | IRDA_DEBUG(2, "%s(%d):block_til_ready before block on %s open_count=%d\n", |
38c58032 | 321 | __FILE__, __LINE__, tty->driver->name, port->count); |
1da177e4 | 322 | |
38c58032 | 323 | spin_lock_irqsave(&port->lock, flags); |
e359a4e3 | 324 | port->count--; |
38c58032 | 325 | port->blocked_open++; |
2f7c069b | 326 | spin_unlock_irqrestore(&port->lock, flags); |
6819bc2e | 327 | |
1da177e4 | 328 | while (1) { |
e1c969f7 | 329 | if (C_BAUD(tty) && test_bit(ASYNCB_INITIALIZED, &port->flags)) |
0ba9ff84 | 330 | tty_port_raise_dtr_rts(port); |
6819bc2e | 331 | |
0b176ce3 | 332 | set_current_state(TASK_INTERRUPTIBLE); |
6819bc2e | 333 | |
1da177e4 | 334 | if (tty_hung_up_p(filp) || |
38c58032 JS |
335 | !test_bit(ASYNCB_INITIALIZED, &port->flags)) { |
336 | retval = (port->flags & ASYNC_HUP_NOTIFY) ? | |
1da177e4 LT |
337 | -EAGAIN : -ERESTARTSYS; |
338 | break; | |
339 | } | |
6819bc2e YH |
340 | |
341 | /* | |
1da177e4 LT |
342 | * Check if link is ready now. Even if CLOCAL is |
343 | * specified, we cannot return before the IrCOMM link is | |
6819bc2e | 344 | * ready |
1da177e4 | 345 | */ |
38c58032 | 346 | if (!test_bit(ASYNCB_CLOSING, &port->flags) && |
0ba9ff84 | 347 | (do_clocal || tty_port_carrier_raised(port)) && |
1da177e4 LT |
348 | self->state == IRCOMM_TTY_READY) |
349 | { | |
6819bc2e | 350 | break; |
1da177e4 | 351 | } |
6819bc2e | 352 | |
1da177e4 LT |
353 | if (signal_pending(current)) { |
354 | retval = -ERESTARTSYS; | |
355 | break; | |
356 | } | |
6819bc2e | 357 | |
1da177e4 | 358 | IRDA_DEBUG(1, "%s(%d):block_til_ready blocking on %s open_count=%d\n", |
38c58032 | 359 | __FILE__, __LINE__, tty->driver->name, port->count); |
6819bc2e | 360 | |
1da177e4 LT |
361 | schedule(); |
362 | } | |
6819bc2e | 363 | |
1da177e4 | 364 | __set_current_state(TASK_RUNNING); |
38c58032 | 365 | remove_wait_queue(&port->open_wait, &wait); |
6819bc2e | 366 | |
a4ed2e73 PH |
367 | spin_lock_irqsave(&port->lock, flags); |
368 | if (!tty_hung_up_p(filp)) | |
38c58032 | 369 | port->count++; |
38c58032 | 370 | port->blocked_open--; |
2f7c069b | 371 | spin_unlock_irqrestore(&port->lock, flags); |
6819bc2e | 372 | |
1da177e4 | 373 | IRDA_DEBUG(1, "%s(%d):block_til_ready after blocking on %s open_count=%d\n", |
38c58032 | 374 | __FILE__, __LINE__, tty->driver->name, port->count); |
6819bc2e | 375 | |
1da177e4 | 376 | if (!retval) |
38c58032 | 377 | port->flags |= ASYNC_NORMAL_ACTIVE; |
6819bc2e YH |
378 | |
379 | return retval; | |
1da177e4 LT |
380 | } |
381 | ||
9c650ffc JS |
382 | |
383 | static int ircomm_tty_install(struct tty_driver *driver, struct tty_struct *tty) | |
1da177e4 LT |
384 | { |
385 | struct ircomm_tty_cb *self; | |
410235fd | 386 | unsigned int line = tty->index; |
1da177e4 | 387 | |
1da177e4 LT |
388 | /* Check if instance already exists */ |
389 | self = hashbin_lock_find(ircomm_tty, line, NULL); | |
390 | if (!self) { | |
391 | /* No, so make new instance */ | |
0da974f4 | 392 | self = kzalloc(sizeof(struct ircomm_tty_cb), GFP_KERNEL); |
6c91023d | 393 | if (self == NULL) |
1da177e4 | 394 | return -ENOMEM; |
6819bc2e | 395 | |
a3cc9fcf | 396 | tty_port_init(&self->port); |
0ba9ff84 | 397 | self->port.ops = &ircomm_port_ops; |
1da177e4 LT |
398 | self->magic = IRCOMM_TTY_MAGIC; |
399 | self->flow = FLOW_STOP; | |
400 | ||
401 | self->line = line; | |
c4028958 | 402 | INIT_WORK(&self->tqueue, ircomm_tty_do_softint); |
1da177e4 LT |
403 | self->max_header_size = IRCOMM_TTY_HDR_UNINITIALISED; |
404 | self->max_data_size = IRCOMM_TTY_DATA_UNINITIALISED; | |
1da177e4 LT |
405 | |
406 | /* Init some important stuff */ | |
407 | init_timer(&self->watchdog_timer); | |
1da177e4 LT |
408 | spin_lock_init(&self->spinlock); |
409 | ||
6819bc2e | 410 | /* |
1da177e4 LT |
411 | * Force TTY into raw mode by default which is usually what |
412 | * we want for IrCOMM and IrLPT. This way applications will | |
6819bc2e | 413 | * not have to twiddle with printcap etc. |
ad36b88e AC |
414 | * |
415 | * Note this is completely usafe and doesn't work properly | |
1da177e4 | 416 | */ |
adc8d746 AC |
417 | tty->termios.c_iflag = 0; |
418 | tty->termios.c_oflag = 0; | |
1da177e4 LT |
419 | |
420 | /* Insert into hash */ | |
421 | hashbin_insert(ircomm_tty, (irda_queue_t *) self, line, NULL); | |
422 | } | |
9c650ffc | 423 | |
6f560125 SL |
424 | tty->driver_data = self; |
425 | ||
9c650ffc JS |
426 | return tty_port_install(&self->port, driver, tty); |
427 | } | |
428 | ||
429 | /* | |
430 | * Function ircomm_tty_open (tty, filp) | |
431 | * | |
432 | * This routine is called when a particular tty device is opened. This | |
433 | * routine is mandatory; if this routine is not filled in, the attempted | |
434 | * open will fail with ENODEV. | |
435 | */ | |
436 | static int ircomm_tty_open(struct tty_struct *tty, struct file *filp) | |
437 | { | |
438 | struct ircomm_tty_cb *self = tty->driver_data; | |
439 | unsigned long flags; | |
440 | int ret; | |
441 | ||
442 | IRDA_DEBUG(2, "%s()\n", __func__ ); | |
443 | ||
1da177e4 | 444 | /* ++ is not atomic, so this should be protected - Jean II */ |
e673927d | 445 | spin_lock_irqsave(&self->port.lock, flags); |
580d27b4 | 446 | self->port.count++; |
e673927d | 447 | spin_unlock_irqrestore(&self->port.lock, flags); |
62f228ac | 448 | tty_port_tty_set(&self->port, tty); |
1da177e4 | 449 | |
0dc47877 | 450 | IRDA_DEBUG(1, "%s(), %s%d, count = %d\n", __func__ , tty->driver->name, |
580d27b4 | 451 | self->line, self->port.count); |
1da177e4 LT |
452 | |
453 | /* Not really used by us, but lets do it anyway */ | |
d6c53c0e | 454 | self->port.low_latency = (self->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0; |
1da177e4 LT |
455 | |
456 | /* | |
457 | * If the port is the middle of closing, bail out now | |
458 | */ | |
e359a4e3 | 459 | if (test_bit(ASYNCB_CLOSING, &self->port.flags)) { |
1da177e4 LT |
460 | |
461 | /* Hm, why are we blocking on ASYNC_CLOSING if we | |
462 | * do return -EAGAIN/-ERESTARTSYS below anyway? | |
463 | * IMHO it's either not needed in the first place | |
464 | * or for some reason we need to make sure the async | |
465 | * closing has been finished - if so, wouldn't we | |
466 | * probably better sleep uninterruptible? | |
467 | */ | |
468 | ||
a3cc9fcf | 469 | if (wait_event_interruptible(self->port.close_wait, |
849d5a99 | 470 | !test_bit(ASYNCB_CLOSING, &self->port.flags))) { |
6c91023d JP |
471 | net_warn_ratelimited("%s - got signal while blocking on ASYNC_CLOSING!\n", |
472 | __func__); | |
1da177e4 LT |
473 | return -ERESTARTSYS; |
474 | } | |
475 | ||
476 | #ifdef SERIAL_DO_RESTART | |
849d5a99 | 477 | return (self->port.flags & ASYNC_HUP_NOTIFY) ? |
a02cec21 | 478 | -EAGAIN : -ERESTARTSYS; |
1da177e4 LT |
479 | #else |
480 | return -EAGAIN; | |
481 | #endif | |
482 | } | |
483 | ||
484 | /* Check if this is a "normal" ircomm device, or an irlpt device */ | |
9c650ffc | 485 | if (self->line < 0x10) { |
1da177e4 LT |
486 | self->service_type = IRCOMM_3_WIRE | IRCOMM_9_WIRE; |
487 | self->settings.service_type = IRCOMM_9_WIRE; /* 9 wire as default */ | |
488 | /* Jan Kiszka -> add DSR/RI -> Conform to IrCOMM spec */ | |
489 | self->settings.dce = IRCOMM_CTS | IRCOMM_CD | IRCOMM_DSR | IRCOMM_RI; /* Default line settings */ | |
0dc47877 | 490 | IRDA_DEBUG(2, "%s(), IrCOMM device\n", __func__ ); |
1da177e4 | 491 | } else { |
0dc47877 | 492 | IRDA_DEBUG(2, "%s(), IrLPT device\n", __func__ ); |
1da177e4 LT |
493 | self->service_type = IRCOMM_3_WIRE_RAW; |
494 | self->settings.service_type = IRCOMM_3_WIRE_RAW; /* Default */ | |
495 | } | |
496 | ||
497 | ret = ircomm_tty_startup(self); | |
498 | if (ret) | |
499 | return ret; | |
500 | ||
62f228ac | 501 | ret = ircomm_tty_block_til_ready(self, tty, filp); |
1da177e4 | 502 | if (ret) { |
6819bc2e | 503 | IRDA_DEBUG(2, |
0dc47877 | 504 | "%s(), returning after block_til_ready with %d\n", __func__ , |
1da177e4 LT |
505 | ret); |
506 | ||
507 | return ret; | |
508 | } | |
509 | return 0; | |
510 | } | |
511 | ||
512 | /* | |
513 | * Function ircomm_tty_close (tty, filp) | |
514 | * | |
515 | * This routine is called when a particular tty device is closed. | |
516 | * | |
517 | */ | |
518 | static void ircomm_tty_close(struct tty_struct *tty, struct file *filp) | |
519 | { | |
520 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
38c58032 | 521 | struct tty_port *port = &self->port; |
1da177e4 | 522 | |
0dc47877 | 523 | IRDA_DEBUG(0, "%s()\n", __func__ ); |
1da177e4 | 524 | |
1da177e4 LT |
525 | IRDA_ASSERT(self != NULL, return;); |
526 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
527 | ||
c0e78650 | 528 | if (tty_port_close_start(port, tty, filp) == 0) |
1da177e4 | 529 | return; |
1da177e4 LT |
530 | |
531 | ircomm_tty_shutdown(self); | |
532 | ||
f34d7a5b | 533 | tty_driver_flush_buffer(tty); |
1da177e4 | 534 | |
a1e84403 | 535 | tty_port_close_end(port, tty); |
38c58032 | 536 | tty_port_tty_set(port, NULL); |
1da177e4 LT |
537 | } |
538 | ||
539 | /* | |
540 | * Function ircomm_tty_flush_buffer (tty) | |
541 | * | |
6819bc2e | 542 | * |
1da177e4 LT |
543 | * |
544 | */ | |
545 | static void ircomm_tty_flush_buffer(struct tty_struct *tty) | |
546 | { | |
547 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
548 | ||
549 | IRDA_ASSERT(self != NULL, return;); | |
550 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
551 | ||
6819bc2e YH |
552 | /* |
553 | * Let do_softint() do this to avoid race condition with | |
554 | * do_softint() ;-) | |
1da177e4 LT |
555 | */ |
556 | schedule_work(&self->tqueue); | |
557 | } | |
558 | ||
559 | /* | |
c4028958 | 560 | * Function ircomm_tty_do_softint (work) |
1da177e4 LT |
561 | * |
562 | * We use this routine to give the write wakeup to the user at at a | |
6819bc2e | 563 | * safe time (as fast as possible after write have completed). This |
1da177e4 LT |
564 | * can be compared to the Tx interrupt. |
565 | */ | |
c4028958 | 566 | static void ircomm_tty_do_softint(struct work_struct *work) |
1da177e4 | 567 | { |
c4028958 DH |
568 | struct ircomm_tty_cb *self = |
569 | container_of(work, struct ircomm_tty_cb, tqueue); | |
1da177e4 LT |
570 | struct tty_struct *tty; |
571 | unsigned long flags; | |
572 | struct sk_buff *skb, *ctrl_skb; | |
573 | ||
0dc47877 | 574 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 LT |
575 | |
576 | if (!self || self->magic != IRCOMM_TTY_MAGIC) | |
577 | return; | |
578 | ||
62f228ac | 579 | tty = tty_port_tty_get(&self->port); |
1da177e4 LT |
580 | if (!tty) |
581 | return; | |
582 | ||
583 | /* Unlink control buffer */ | |
584 | spin_lock_irqsave(&self->spinlock, flags); | |
585 | ||
586 | ctrl_skb = self->ctrl_skb; | |
587 | self->ctrl_skb = NULL; | |
588 | ||
589 | spin_unlock_irqrestore(&self->spinlock, flags); | |
590 | ||
591 | /* Flush control buffer if any */ | |
592 | if(ctrl_skb) { | |
593 | if(self->flow == FLOW_START) | |
594 | ircomm_control_request(self->ircomm, ctrl_skb); | |
595 | /* Drop reference count - see ircomm_ttp_data_request(). */ | |
596 | dev_kfree_skb(ctrl_skb); | |
597 | } | |
598 | ||
599 | if (tty->hw_stopped) | |
62f228ac | 600 | goto put; |
1da177e4 LT |
601 | |
602 | /* Unlink transmit buffer */ | |
603 | spin_lock_irqsave(&self->spinlock, flags); | |
6819bc2e | 604 | |
1da177e4 LT |
605 | skb = self->tx_skb; |
606 | self->tx_skb = NULL; | |
607 | ||
608 | spin_unlock_irqrestore(&self->spinlock, flags); | |
609 | ||
610 | /* Flush transmit buffer if any */ | |
611 | if (skb) { | |
612 | ircomm_tty_do_event(self, IRCOMM_TTY_DATA_REQUEST, skb, NULL); | |
613 | /* Drop reference count - see ircomm_ttp_data_request(). */ | |
614 | dev_kfree_skb(skb); | |
615 | } | |
6819bc2e | 616 | |
1da177e4 | 617 | /* Check if user (still) wants to be waken up */ |
a352def2 | 618 | tty_wakeup(tty); |
62f228ac JS |
619 | put: |
620 | tty_kref_put(tty); | |
1da177e4 LT |
621 | } |
622 | ||
623 | /* | |
624 | * Function ircomm_tty_write (tty, buf, count) | |
625 | * | |
626 | * This routine is called by the kernel to write a series of characters | |
627 | * to the tty device. The characters may come from user space or kernel | |
628 | * space. This routine will return the number of characters actually | |
629 | * accepted for writing. This routine is mandatory. | |
630 | */ | |
631 | static int ircomm_tty_write(struct tty_struct *tty, | |
632 | const unsigned char *buf, int count) | |
633 | { | |
634 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
635 | unsigned long flags; | |
636 | struct sk_buff *skb; | |
637 | int tailroom = 0; | |
638 | int len = 0; | |
639 | int size; | |
640 | ||
0dc47877 | 641 | IRDA_DEBUG(2, "%s(), count=%d, hw_stopped=%d\n", __func__ , count, |
1da177e4 LT |
642 | tty->hw_stopped); |
643 | ||
644 | IRDA_ASSERT(self != NULL, return -1;); | |
645 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
646 | ||
647 | /* We may receive packets from the TTY even before we have finished | |
648 | * our setup. Not cool. | |
649 | * The problem is that we don't know the final header and data size | |
650 | * to create the proper skb, so any skb we would create would have | |
651 | * bogus header and data size, so need care. | |
652 | * We use a bogus header size to safely detect this condition. | |
653 | * Another problem is that hw_stopped was set to 0 way before it | |
654 | * should be, so we would drop this skb. It should now be fixed. | |
655 | * One option is to not accept data until we are properly setup. | |
656 | * But, I suspect that when it happens, the ppp line discipline | |
657 | * just "drops" the data, which might screw up connect scripts. | |
658 | * The second option is to create a "safe skb", with large header | |
659 | * and small size (see ircomm_tty_open() for values). | |
660 | * We just need to make sure that when the real values get filled, | |
661 | * we don't mess up the original "safe skb" (see tx_data_size). | |
662 | * Jean II */ | |
663 | if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) { | |
0dc47877 | 664 | IRDA_DEBUG(1, "%s() : not initialised\n", __func__); |
1da177e4 LT |
665 | #ifdef IRCOMM_NO_TX_BEFORE_INIT |
666 | /* We didn't consume anything, TTY will retry */ | |
667 | return 0; | |
668 | #endif | |
669 | } | |
670 | ||
671 | if (count < 1) | |
672 | return 0; | |
673 | ||
674 | /* Protect our manipulation of self->tx_skb and related */ | |
675 | spin_lock_irqsave(&self->spinlock, flags); | |
676 | ||
677 | /* Fetch current transmit buffer */ | |
678 | skb = self->tx_skb; | |
679 | ||
6819bc2e | 680 | /* |
1da177e4 LT |
681 | * Send out all the data we get, possibly as multiple fragmented |
682 | * frames, but this will only happen if the data is larger than the | |
683 | * max data size. The normal case however is just the opposite, and | |
684 | * this function may be called multiple times, and will then actually | |
6819bc2e | 685 | * defragment the data and send it out as one packet as soon as |
1da177e4 LT |
686 | * possible, but at a safer point in time |
687 | */ | |
688 | while (count) { | |
689 | size = count; | |
690 | ||
691 | /* Adjust data size to the max data size */ | |
692 | if (size > self->max_data_size) | |
693 | size = self->max_data_size; | |
6819bc2e YH |
694 | |
695 | /* | |
1da177e4 | 696 | * Do we already have a buffer ready for transmit, or do |
6819bc2e | 697 | * we need to allocate a new frame |
1da177e4 | 698 | */ |
6819bc2e YH |
699 | if (skb) { |
700 | /* | |
701 | * Any room for more data at the end of the current | |
1da177e4 | 702 | * transmit buffer? Cannot use skb_tailroom, since |
6819bc2e | 703 | * dev_alloc_skb gives us a larger skb than we |
1da177e4 LT |
704 | * requested |
705 | * Note : use tx_data_size, because max_data_size | |
706 | * may have changed and we don't want to overwrite | |
707 | * the skb. - Jean II | |
708 | */ | |
709 | if ((tailroom = (self->tx_data_size - skb->len)) > 0) { | |
710 | /* Adjust data to tailroom */ | |
711 | if (size > tailroom) | |
712 | size = tailroom; | |
713 | } else { | |
6819bc2e YH |
714 | /* |
715 | * Current transmit frame is full, so break | |
1da177e4 LT |
716 | * out, so we can send it as soon as possible |
717 | */ | |
718 | break; | |
719 | } | |
720 | } else { | |
721 | /* Prepare a full sized frame */ | |
485fb2c9 SO |
722 | skb = alloc_skb(self->max_data_size+ |
723 | self->max_header_size, | |
724 | GFP_ATOMIC); | |
1da177e4 LT |
725 | if (!skb) { |
726 | spin_unlock_irqrestore(&self->spinlock, flags); | |
727 | return -ENOBUFS; | |
728 | } | |
729 | skb_reserve(skb, self->max_header_size); | |
730 | self->tx_skb = skb; | |
731 | /* Remember skb size because max_data_size may | |
732 | * change later on - Jean II */ | |
733 | self->tx_data_size = self->max_data_size; | |
734 | } | |
735 | ||
736 | /* Copy data */ | |
737 | memcpy(skb_put(skb,size), buf + len, size); | |
738 | ||
739 | count -= size; | |
740 | len += size; | |
741 | } | |
742 | ||
743 | spin_unlock_irqrestore(&self->spinlock, flags); | |
744 | ||
6819bc2e | 745 | /* |
1da177e4 LT |
746 | * Schedule a new thread which will transmit the frame as soon |
747 | * as possible, but at a safe point in time. We do this so the | |
748 | * "user" can give us data multiple times, as PPP does (because of | |
749 | * its 256 byte tx buffer). We will then defragment and send out | |
6819bc2e | 750 | * all this data as one single packet. |
1da177e4 LT |
751 | */ |
752 | schedule_work(&self->tqueue); | |
6819bc2e | 753 | |
1da177e4 LT |
754 | return len; |
755 | } | |
756 | ||
757 | /* | |
758 | * Function ircomm_tty_write_room (tty) | |
759 | * | |
760 | * This routine returns the numbers of characters the tty driver will | |
761 | * accept for queuing to be written. This number is subject to change as | |
762 | * output buffers get emptied, or if the output flow control is acted. | |
763 | */ | |
764 | static int ircomm_tty_write_room(struct tty_struct *tty) | |
765 | { | |
766 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
767 | unsigned long flags; | |
768 | int ret; | |
769 | ||
770 | IRDA_ASSERT(self != NULL, return -1;); | |
771 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
772 | ||
773 | #ifdef IRCOMM_NO_TX_BEFORE_INIT | |
774 | /* max_header_size tells us if the channel is initialised or not. */ | |
775 | if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) | |
776 | /* Don't bother us yet */ | |
777 | return 0; | |
778 | #endif | |
779 | ||
780 | /* Check if we are allowed to transmit any data. | |
781 | * hw_stopped is the regular flow control. | |
782 | * Jean II */ | |
783 | if (tty->hw_stopped) | |
784 | ret = 0; | |
785 | else { | |
786 | spin_lock_irqsave(&self->spinlock, flags); | |
787 | if (self->tx_skb) | |
788 | ret = self->tx_data_size - self->tx_skb->len; | |
789 | else | |
790 | ret = self->max_data_size; | |
791 | spin_unlock_irqrestore(&self->spinlock, flags); | |
792 | } | |
0dc47877 | 793 | IRDA_DEBUG(2, "%s(), ret=%d\n", __func__ , ret); |
1da177e4 LT |
794 | |
795 | return ret; | |
796 | } | |
797 | ||
798 | /* | |
799 | * Function ircomm_tty_wait_until_sent (tty, timeout) | |
800 | * | |
801 | * This routine waits until the device has written out all of the | |
802 | * characters in its transmitter FIFO. | |
803 | */ | |
804 | static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout) | |
805 | { | |
806 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
807 | unsigned long orig_jiffies, poll_time; | |
808 | unsigned long flags; | |
6819bc2e | 809 | |
0dc47877 | 810 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 LT |
811 | |
812 | IRDA_ASSERT(self != NULL, return;); | |
813 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
814 | ||
815 | orig_jiffies = jiffies; | |
816 | ||
817 | /* Set poll time to 200 ms */ | |
818 | poll_time = IRDA_MIN(timeout, msecs_to_jiffies(200)); | |
819 | ||
820 | spin_lock_irqsave(&self->spinlock, flags); | |
821 | while (self->tx_skb && self->tx_skb->len) { | |
822 | spin_unlock_irqrestore(&self->spinlock, flags); | |
121caf57 | 823 | schedule_timeout_interruptible(poll_time); |
1da177e4 LT |
824 | spin_lock_irqsave(&self->spinlock, flags); |
825 | if (signal_pending(current)) | |
826 | break; | |
827 | if (timeout && time_after(jiffies, orig_jiffies + timeout)) | |
828 | break; | |
829 | } | |
830 | spin_unlock_irqrestore(&self->spinlock, flags); | |
831 | current->state = TASK_RUNNING; | |
832 | } | |
833 | ||
834 | /* | |
835 | * Function ircomm_tty_throttle (tty) | |
836 | * | |
837 | * This routine notifies the tty driver that input buffers for the line | |
838 | * discipline are close to full, and it should somehow signal that no | |
6819bc2e | 839 | * more characters should be sent to the tty. |
1da177e4 LT |
840 | */ |
841 | static void ircomm_tty_throttle(struct tty_struct *tty) | |
842 | { | |
843 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
844 | ||
0dc47877 | 845 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 LT |
846 | |
847 | IRDA_ASSERT(self != NULL, return;); | |
848 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
849 | ||
850 | /* Software flow control? */ | |
851 | if (I_IXOFF(tty)) | |
852 | ircomm_tty_send_xchar(tty, STOP_CHAR(tty)); | |
6819bc2e | 853 | |
1da177e4 | 854 | /* Hardware flow control? */ |
adc8d746 | 855 | if (tty->termios.c_cflag & CRTSCTS) { |
1da177e4 LT |
856 | self->settings.dte &= ~IRCOMM_RTS; |
857 | self->settings.dte |= IRCOMM_DELTA_RTS; | |
6819bc2e | 858 | |
1da177e4 LT |
859 | ircomm_param_request(self, IRCOMM_DTE, TRUE); |
860 | } | |
861 | ||
6819bc2e | 862 | ircomm_flow_request(self->ircomm, FLOW_STOP); |
1da177e4 LT |
863 | } |
864 | ||
865 | /* | |
866 | * Function ircomm_tty_unthrottle (tty) | |
867 | * | |
868 | * This routine notifies the tty drivers that it should signals that | |
869 | * characters can now be sent to the tty without fear of overrunning the | |
870 | * input buffers of the line disciplines. | |
871 | */ | |
872 | static void ircomm_tty_unthrottle(struct tty_struct *tty) | |
873 | { | |
874 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
875 | ||
0dc47877 | 876 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 LT |
877 | |
878 | IRDA_ASSERT(self != NULL, return;); | |
879 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
880 | ||
881 | /* Using software flow control? */ | |
882 | if (I_IXOFF(tty)) { | |
883 | ircomm_tty_send_xchar(tty, START_CHAR(tty)); | |
884 | } | |
885 | ||
886 | /* Using hardware flow control? */ | |
adc8d746 | 887 | if (tty->termios.c_cflag & CRTSCTS) { |
1da177e4 LT |
888 | self->settings.dte |= (IRCOMM_RTS|IRCOMM_DELTA_RTS); |
889 | ||
890 | ircomm_param_request(self, IRCOMM_DTE, TRUE); | |
0dc47877 | 891 | IRDA_DEBUG(1, "%s(), FLOW_START\n", __func__ ); |
1da177e4 | 892 | } |
6819bc2e | 893 | ircomm_flow_request(self->ircomm, FLOW_START); |
1da177e4 LT |
894 | } |
895 | ||
896 | /* | |
897 | * Function ircomm_tty_chars_in_buffer (tty) | |
898 | * | |
899 | * Indicates if there are any data in the buffer | |
900 | * | |
901 | */ | |
902 | static int ircomm_tty_chars_in_buffer(struct tty_struct *tty) | |
903 | { | |
904 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
905 | unsigned long flags; | |
906 | int len = 0; | |
907 | ||
908 | IRDA_ASSERT(self != NULL, return -1;); | |
909 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
910 | ||
911 | spin_lock_irqsave(&self->spinlock, flags); | |
912 | ||
913 | if (self->tx_skb) | |
914 | len = self->tx_skb->len; | |
915 | ||
916 | spin_unlock_irqrestore(&self->spinlock, flags); | |
917 | ||
918 | return len; | |
919 | } | |
920 | ||
921 | static void ircomm_tty_shutdown(struct ircomm_tty_cb *self) | |
922 | { | |
923 | unsigned long flags; | |
924 | ||
925 | IRDA_ASSERT(self != NULL, return;); | |
926 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
927 | ||
0dc47877 | 928 | IRDA_DEBUG(0, "%s()\n", __func__ ); |
1da177e4 | 929 | |
849d5a99 | 930 | if (!test_and_clear_bit(ASYNCB_INITIALIZED, &self->port.flags)) |
1da177e4 LT |
931 | return; |
932 | ||
933 | ircomm_tty_detach_cable(self); | |
934 | ||
935 | spin_lock_irqsave(&self->spinlock, flags); | |
936 | ||
937 | del_timer(&self->watchdog_timer); | |
6819bc2e | 938 | |
1da177e4 LT |
939 | /* Free parameter buffer */ |
940 | if (self->ctrl_skb) { | |
941 | dev_kfree_skb(self->ctrl_skb); | |
942 | self->ctrl_skb = NULL; | |
943 | } | |
944 | ||
945 | /* Free transmit buffer */ | |
946 | if (self->tx_skb) { | |
947 | dev_kfree_skb(self->tx_skb); | |
948 | self->tx_skb = NULL; | |
949 | } | |
950 | ||
951 | if (self->ircomm) { | |
952 | ircomm_close(self->ircomm); | |
953 | self->ircomm = NULL; | |
954 | } | |
955 | ||
956 | spin_unlock_irqrestore(&self->spinlock, flags); | |
957 | } | |
958 | ||
959 | /* | |
960 | * Function ircomm_tty_hangup (tty) | |
961 | * | |
962 | * This routine notifies the tty driver that it should hangup the tty | |
963 | * device. | |
6819bc2e | 964 | * |
1da177e4 LT |
965 | */ |
966 | static void ircomm_tty_hangup(struct tty_struct *tty) | |
967 | { | |
968 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
38c58032 | 969 | struct tty_port *port = &self->port; |
1da177e4 LT |
970 | unsigned long flags; |
971 | ||
0dc47877 | 972 | IRDA_DEBUG(0, "%s()\n", __func__ ); |
1da177e4 LT |
973 | |
974 | IRDA_ASSERT(self != NULL, return;); | |
975 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
976 | ||
1da177e4 LT |
977 | /* ircomm_tty_flush_buffer(tty); */ |
978 | ircomm_tty_shutdown(self); | |
979 | ||
38c58032 JS |
980 | spin_lock_irqsave(&port->lock, flags); |
981 | port->flags &= ~ASYNC_NORMAL_ACTIVE; | |
982 | if (port->tty) { | |
983 | set_bit(TTY_IO_ERROR, &port->tty->flags); | |
984 | tty_kref_put(port->tty); | |
62f228ac | 985 | } |
38c58032 JS |
986 | port->tty = NULL; |
987 | port->count = 0; | |
988 | spin_unlock_irqrestore(&port->lock, flags); | |
1da177e4 | 989 | |
38c58032 | 990 | wake_up_interruptible(&port->open_wait); |
1da177e4 LT |
991 | } |
992 | ||
993 | /* | |
994 | * Function ircomm_tty_send_xchar (tty, ch) | |
995 | * | |
996 | * This routine is used to send a high-priority XON/XOFF character to | |
997 | * the device. | |
998 | */ | |
999 | static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch) | |
1000 | { | |
0dc47877 | 1001 | IRDA_DEBUG(0, "%s(), not impl\n", __func__ ); |
1da177e4 LT |
1002 | } |
1003 | ||
1004 | /* | |
1005 | * Function ircomm_tty_start (tty) | |
1006 | * | |
1007 | * This routine notifies the tty driver that it resume sending | |
6819bc2e | 1008 | * characters to the tty device. |
1da177e4 LT |
1009 | */ |
1010 | void ircomm_tty_start(struct tty_struct *tty) | |
1011 | { | |
1012 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
1013 | ||
1014 | ircomm_flow_request(self->ircomm, FLOW_START); | |
1015 | } | |
1016 | ||
1017 | /* | |
1018 | * Function ircomm_tty_stop (tty) | |
1019 | * | |
1020 | * This routine notifies the tty driver that it should stop outputting | |
6819bc2e | 1021 | * characters to the tty device. |
1da177e4 | 1022 | */ |
6819bc2e | 1023 | static void ircomm_tty_stop(struct tty_struct *tty) |
1da177e4 LT |
1024 | { |
1025 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
1026 | ||
1027 | IRDA_ASSERT(self != NULL, return;); | |
1028 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
1029 | ||
1030 | ircomm_flow_request(self->ircomm, FLOW_STOP); | |
1031 | } | |
1032 | ||
1033 | /* | |
1034 | * Function ircomm_check_modem_status (self) | |
1035 | * | |
1036 | * Check for any changes in the DCE's line settings. This function should | |
1037 | * be called whenever the dce parameter settings changes, to update the | |
1038 | * flow control settings and other things | |
1039 | */ | |
1040 | void ircomm_tty_check_modem_status(struct ircomm_tty_cb *self) | |
1041 | { | |
1042 | struct tty_struct *tty; | |
1043 | int status; | |
1044 | ||
0dc47877 | 1045 | IRDA_DEBUG(0, "%s()\n", __func__ ); |
1da177e4 LT |
1046 | |
1047 | IRDA_ASSERT(self != NULL, return;); | |
1048 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
1049 | ||
62f228ac | 1050 | tty = tty_port_tty_get(&self->port); |
1da177e4 LT |
1051 | |
1052 | status = self->settings.dce; | |
1053 | ||
1054 | if (status & IRCOMM_DCE_DELTA_ANY) { | |
1055 | /*wake_up_interruptible(&self->delta_msr_wait);*/ | |
1056 | } | |
849d5a99 | 1057 | if ((self->port.flags & ASYNC_CHECK_CD) && (status & IRCOMM_DELTA_CD)) { |
6819bc2e | 1058 | IRDA_DEBUG(2, |
0dc47877 | 1059 | "%s(), ircomm%d CD now %s...\n", __func__ , self->line, |
1da177e4 LT |
1060 | (status & IRCOMM_CD) ? "on" : "off"); |
1061 | ||
1062 | if (status & IRCOMM_CD) { | |
a3cc9fcf | 1063 | wake_up_interruptible(&self->port.open_wait); |
1da177e4 | 1064 | } else { |
6819bc2e | 1065 | IRDA_DEBUG(2, |
0dc47877 | 1066 | "%s(), Doing serial hangup..\n", __func__ ); |
1da177e4 LT |
1067 | if (tty) |
1068 | tty_hangup(tty); | |
1069 | ||
1070 | /* Hangup will remote the tty, so better break out */ | |
62f228ac | 1071 | goto put; |
1da177e4 LT |
1072 | } |
1073 | } | |
f21ec3d2 | 1074 | if (tty && tty_port_cts_enabled(&self->port)) { |
1da177e4 LT |
1075 | if (tty->hw_stopped) { |
1076 | if (status & IRCOMM_CTS) { | |
6819bc2e | 1077 | IRDA_DEBUG(2, |
0dc47877 | 1078 | "%s(), CTS tx start...\n", __func__ ); |
1da177e4 | 1079 | tty->hw_stopped = 0; |
6819bc2e | 1080 | |
1da177e4 | 1081 | /* Wake up processes blocked on open */ |
a3cc9fcf | 1082 | wake_up_interruptible(&self->port.open_wait); |
1da177e4 LT |
1083 | |
1084 | schedule_work(&self->tqueue); | |
62f228ac | 1085 | goto put; |
1da177e4 LT |
1086 | } |
1087 | } else { | |
1088 | if (!(status & IRCOMM_CTS)) { | |
6819bc2e | 1089 | IRDA_DEBUG(2, |
0dc47877 | 1090 | "%s(), CTS tx stop...\n", __func__ ); |
1da177e4 LT |
1091 | tty->hw_stopped = 1; |
1092 | } | |
1093 | } | |
1094 | } | |
62f228ac JS |
1095 | put: |
1096 | tty_kref_put(tty); | |
1da177e4 LT |
1097 | } |
1098 | ||
1099 | /* | |
1100 | * Function ircomm_tty_data_indication (instance, sap, skb) | |
1101 | * | |
1102 | * Handle incoming data, and deliver it to the line discipline | |
1103 | * | |
1104 | */ | |
1105 | static int ircomm_tty_data_indication(void *instance, void *sap, | |
1106 | struct sk_buff *skb) | |
1107 | { | |
1108 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; | |
62f228ac | 1109 | struct tty_struct *tty; |
1da177e4 | 1110 | |
0dc47877 | 1111 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
6819bc2e | 1112 | |
1da177e4 LT |
1113 | IRDA_ASSERT(self != NULL, return -1;); |
1114 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
1115 | IRDA_ASSERT(skb != NULL, return -1;); | |
1116 | ||
62f228ac JS |
1117 | tty = tty_port_tty_get(&self->port); |
1118 | if (!tty) { | |
0dc47877 | 1119 | IRDA_DEBUG(0, "%s(), no tty!\n", __func__ ); |
1da177e4 LT |
1120 | return 0; |
1121 | } | |
1122 | ||
6819bc2e | 1123 | /* |
1da177e4 LT |
1124 | * If we receive data when hardware is stopped then something is wrong. |
1125 | * We try to poll the peers line settings to check if we are up todate. | |
6819bc2e | 1126 | * Devices like WinCE can do this, and since they don't send any |
1da177e4 LT |
1127 | * params, we can just as well declare the hardware for running. |
1128 | */ | |
62f228ac | 1129 | if (tty->hw_stopped && (self->flow == FLOW_START)) { |
0dc47877 | 1130 | IRDA_DEBUG(0, "%s(), polling for line settings!\n", __func__ ); |
1da177e4 LT |
1131 | ircomm_param_request(self, IRCOMM_POLL, TRUE); |
1132 | ||
1133 | /* We can just as well declare the hardware for running */ | |
1134 | ircomm_tty_send_initial_parameters(self); | |
1135 | ircomm_tty_link_established(self); | |
1136 | } | |
2e124b4a | 1137 | tty_kref_put(tty); |
1da177e4 | 1138 | |
6819bc2e | 1139 | /* |
cbfd1526 AV |
1140 | * Use flip buffer functions since the code may be called from interrupt |
1141 | * context | |
1da177e4 | 1142 | */ |
05c7cd39 | 1143 | tty_insert_flip_string(&self->port, skb->data, skb->len); |
2e124b4a | 1144 | tty_flip_buffer_push(&self->port); |
1da177e4 LT |
1145 | |
1146 | /* No need to kfree_skb - see ircomm_ttp_data_indication() */ | |
1147 | ||
1148 | return 0; | |
1149 | } | |
1150 | ||
1151 | /* | |
1152 | * Function ircomm_tty_control_indication (instance, sap, skb) | |
1153 | * | |
1154 | * Parse all incoming parameters (easy!) | |
1155 | * | |
1156 | */ | |
1157 | static int ircomm_tty_control_indication(void *instance, void *sap, | |
1158 | struct sk_buff *skb) | |
1159 | { | |
1160 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; | |
1161 | int clen; | |
1162 | ||
0dc47877 | 1163 | IRDA_DEBUG(4, "%s()\n", __func__ ); |
6819bc2e | 1164 | |
1da177e4 LT |
1165 | IRDA_ASSERT(self != NULL, return -1;); |
1166 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
1167 | IRDA_ASSERT(skb != NULL, return -1;); | |
1168 | ||
1169 | clen = skb->data[0]; | |
1170 | ||
6819bc2e | 1171 | irda_param_extract_all(self, skb->data+1, IRDA_MIN(skb->len-1, clen), |
1da177e4 LT |
1172 | &ircomm_param_info); |
1173 | ||
1174 | /* No need to kfree_skb - see ircomm_control_indication() */ | |
1175 | ||
1176 | return 0; | |
1177 | } | |
1178 | ||
1179 | /* | |
1180 | * Function ircomm_tty_flow_indication (instance, sap, cmd) | |
1181 | * | |
1182 | * This function is called by IrTTP when it wants us to slow down the | |
1183 | * transmission of data. We just mark the hardware as stopped, and wait | |
1184 | * for IrTTP to notify us that things are OK again. | |
1185 | */ | |
6819bc2e | 1186 | static void ircomm_tty_flow_indication(void *instance, void *sap, |
1da177e4 LT |
1187 | LOCAL_FLOW cmd) |
1188 | { | |
1189 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; | |
1190 | struct tty_struct *tty; | |
1191 | ||
1192 | IRDA_ASSERT(self != NULL, return;); | |
1193 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
1194 | ||
62f228ac | 1195 | tty = tty_port_tty_get(&self->port); |
1da177e4 LT |
1196 | |
1197 | switch (cmd) { | |
1198 | case FLOW_START: | |
0dc47877 | 1199 | IRDA_DEBUG(2, "%s(), hw start!\n", __func__ ); |
62f228ac JS |
1200 | if (tty) |
1201 | tty->hw_stopped = 0; | |
1da177e4 LT |
1202 | |
1203 | /* ircomm_tty_do_softint will take care of the rest */ | |
1204 | schedule_work(&self->tqueue); | |
1205 | break; | |
1206 | default: /* If we get here, something is very wrong, better stop */ | |
1207 | case FLOW_STOP: | |
0dc47877 | 1208 | IRDA_DEBUG(2, "%s(), hw stopped!\n", __func__ ); |
62f228ac JS |
1209 | if (tty) |
1210 | tty->hw_stopped = 1; | |
1da177e4 LT |
1211 | break; |
1212 | } | |
62f228ac JS |
1213 | |
1214 | tty_kref_put(tty); | |
1da177e4 LT |
1215 | self->flow = cmd; |
1216 | } | |
1217 | ||
92b05e13 | 1218 | #ifdef CONFIG_PROC_FS |
3d304176 | 1219 | static void ircomm_tty_line_info(struct ircomm_tty_cb *self, struct seq_file *m) |
1da177e4 | 1220 | { |
62f228ac | 1221 | struct tty_struct *tty; |
3d304176 | 1222 | char sep; |
1da177e4 | 1223 | |
3d304176 | 1224 | seq_printf(m, "State: %s\n", ircomm_tty_state[self->state]); |
1da177e4 | 1225 | |
3d304176 | 1226 | seq_puts(m, "Service type: "); |
1da177e4 | 1227 | if (self->service_type & IRCOMM_9_WIRE) |
3d304176 | 1228 | seq_puts(m, "9_WIRE"); |
1da177e4 | 1229 | else if (self->service_type & IRCOMM_3_WIRE) |
3d304176 | 1230 | seq_puts(m, "3_WIRE"); |
1da177e4 | 1231 | else if (self->service_type & IRCOMM_3_WIRE_RAW) |
3d304176 | 1232 | seq_puts(m, "3_WIRE_RAW"); |
1da177e4 | 1233 | else |
3d304176 AD |
1234 | seq_puts(m, "No common service type!\n"); |
1235 | seq_putc(m, '\n'); | |
1236 | ||
1237 | seq_printf(m, "Port name: %s\n", self->settings.port_name); | |
1238 | ||
1239 | seq_printf(m, "DTE status:"); | |
1240 | sep = ' '; | |
1241 | if (self->settings.dte & IRCOMM_RTS) { | |
1242 | seq_printf(m, "%cRTS", sep); | |
1243 | sep = '|'; | |
1244 | } | |
1245 | if (self->settings.dte & IRCOMM_DTR) { | |
1246 | seq_printf(m, "%cDTR", sep); | |
1247 | sep = '|'; | |
1248 | } | |
1249 | seq_putc(m, '\n'); | |
1250 | ||
1251 | seq_puts(m, "DCE status:"); | |
1252 | sep = ' '; | |
1253 | if (self->settings.dce & IRCOMM_CTS) { | |
1254 | seq_printf(m, "%cCTS", sep); | |
1255 | sep = '|'; | |
1256 | } | |
1257 | if (self->settings.dce & IRCOMM_DSR) { | |
1258 | seq_printf(m, "%cDSR", sep); | |
1259 | sep = '|'; | |
1260 | } | |
1261 | if (self->settings.dce & IRCOMM_CD) { | |
1262 | seq_printf(m, "%cCD", sep); | |
1263 | sep = '|'; | |
1264 | } | |
1265 | if (self->settings.dce & IRCOMM_RI) { | |
1266 | seq_printf(m, "%cRI", sep); | |
1267 | sep = '|'; | |
1268 | } | |
1269 | seq_putc(m, '\n'); | |
1270 | ||
1271 | seq_puts(m, "Configuration: "); | |
1da177e4 | 1272 | if (!self->settings.null_modem) |
3d304176 | 1273 | seq_puts(m, "DTE <-> DCE\n"); |
1da177e4 | 1274 | else |
3d304176 AD |
1275 | seq_puts(m, "DTE <-> DTE (null modem emulation)\n"); |
1276 | ||
1277 | seq_printf(m, "Data rate: %d\n", self->settings.data_rate); | |
1278 | ||
1279 | seq_puts(m, "Flow control:"); | |
1280 | sep = ' '; | |
1281 | if (self->settings.flow_control & IRCOMM_XON_XOFF_IN) { | |
1282 | seq_printf(m, "%cXON_XOFF_IN", sep); | |
1283 | sep = '|'; | |
1284 | } | |
1285 | if (self->settings.flow_control & IRCOMM_XON_XOFF_OUT) { | |
1286 | seq_printf(m, "%cXON_XOFF_OUT", sep); | |
1287 | sep = '|'; | |
1288 | } | |
1289 | if (self->settings.flow_control & IRCOMM_RTS_CTS_IN) { | |
1290 | seq_printf(m, "%cRTS_CTS_IN", sep); | |
1291 | sep = '|'; | |
1292 | } | |
1293 | if (self->settings.flow_control & IRCOMM_RTS_CTS_OUT) { | |
1294 | seq_printf(m, "%cRTS_CTS_OUT", sep); | |
1295 | sep = '|'; | |
1296 | } | |
1297 | if (self->settings.flow_control & IRCOMM_DSR_DTR_IN) { | |
1298 | seq_printf(m, "%cDSR_DTR_IN", sep); | |
1299 | sep = '|'; | |
1300 | } | |
1301 | if (self->settings.flow_control & IRCOMM_DSR_DTR_OUT) { | |
1302 | seq_printf(m, "%cDSR_DTR_OUT", sep); | |
1303 | sep = '|'; | |
1304 | } | |
1305 | if (self->settings.flow_control & IRCOMM_ENQ_ACK_IN) { | |
1306 | seq_printf(m, "%cENQ_ACK_IN", sep); | |
1307 | sep = '|'; | |
1308 | } | |
1309 | if (self->settings.flow_control & IRCOMM_ENQ_ACK_OUT) { | |
1310 | seq_printf(m, "%cENQ_ACK_OUT", sep); | |
1311 | sep = '|'; | |
1312 | } | |
1313 | seq_putc(m, '\n'); | |
1314 | ||
1315 | seq_puts(m, "Flags:"); | |
1316 | sep = ' '; | |
f21ec3d2 | 1317 | if (tty_port_cts_enabled(&self->port)) { |
3d304176 AD |
1318 | seq_printf(m, "%cASYNC_CTS_FLOW", sep); |
1319 | sep = '|'; | |
1320 | } | |
849d5a99 | 1321 | if (self->port.flags & ASYNC_CHECK_CD) { |
3d304176 AD |
1322 | seq_printf(m, "%cASYNC_CHECK_CD", sep); |
1323 | sep = '|'; | |
1324 | } | |
849d5a99 | 1325 | if (self->port.flags & ASYNC_INITIALIZED) { |
3d304176 AD |
1326 | seq_printf(m, "%cASYNC_INITIALIZED", sep); |
1327 | sep = '|'; | |
1328 | } | |
849d5a99 | 1329 | if (self->port.flags & ASYNC_LOW_LATENCY) { |
3d304176 AD |
1330 | seq_printf(m, "%cASYNC_LOW_LATENCY", sep); |
1331 | sep = '|'; | |
1332 | } | |
849d5a99 | 1333 | if (self->port.flags & ASYNC_CLOSING) { |
3d304176 AD |
1334 | seq_printf(m, "%cASYNC_CLOSING", sep); |
1335 | sep = '|'; | |
1336 | } | |
849d5a99 | 1337 | if (self->port.flags & ASYNC_NORMAL_ACTIVE) { |
3d304176 AD |
1338 | seq_printf(m, "%cASYNC_NORMAL_ACTIVE", sep); |
1339 | sep = '|'; | |
1340 | } | |
1341 | seq_putc(m, '\n'); | |
1342 | ||
1343 | seq_printf(m, "Role: %s\n", self->client ? "client" : "server"); | |
580d27b4 | 1344 | seq_printf(m, "Open count: %d\n", self->port.count); |
3d304176 AD |
1345 | seq_printf(m, "Max data size: %d\n", self->max_data_size); |
1346 | seq_printf(m, "Max header size: %d\n", self->max_header_size); | |
6819bc2e | 1347 | |
62f228ac JS |
1348 | tty = tty_port_tty_get(&self->port); |
1349 | if (tty) { | |
3d304176 | 1350 | seq_printf(m, "Hardware: %s\n", |
62f228ac JS |
1351 | tty->hw_stopped ? "Stopped" : "Running"); |
1352 | tty_kref_put(tty); | |
1353 | } | |
1da177e4 LT |
1354 | } |
1355 | ||
3d304176 | 1356 | static int ircomm_tty_proc_show(struct seq_file *m, void *v) |
1da177e4 LT |
1357 | { |
1358 | struct ircomm_tty_cb *self; | |
1da177e4 LT |
1359 | unsigned long flags; |
1360 | ||
1361 | spin_lock_irqsave(&ircomm_tty->hb_spinlock, flags); | |
1362 | ||
1363 | self = (struct ircomm_tty_cb *) hashbin_get_first(ircomm_tty); | |
3d304176 | 1364 | while (self != NULL) { |
1da177e4 LT |
1365 | if (self->magic != IRCOMM_TTY_MAGIC) |
1366 | break; | |
1367 | ||
3d304176 | 1368 | ircomm_tty_line_info(self, m); |
1da177e4 | 1369 | self = (struct ircomm_tty_cb *) hashbin_get_next(ircomm_tty); |
6819bc2e | 1370 | } |
1da177e4 | 1371 | spin_unlock_irqrestore(&ircomm_tty->hb_spinlock, flags); |
3d304176 AD |
1372 | return 0; |
1373 | } | |
1da177e4 | 1374 | |
3d304176 AD |
1375 | static int ircomm_tty_proc_open(struct inode *inode, struct file *file) |
1376 | { | |
1377 | return single_open(file, ircomm_tty_proc_show, NULL); | |
1da177e4 | 1378 | } |
3d304176 AD |
1379 | |
1380 | static const struct file_operations ircomm_tty_proc_fops = { | |
1381 | .owner = THIS_MODULE, | |
1382 | .open = ircomm_tty_proc_open, | |
1383 | .read = seq_read, | |
1384 | .llseek = seq_lseek, | |
1385 | .release = single_release, | |
1386 | }; | |
1da177e4 LT |
1387 | #endif /* CONFIG_PROC_FS */ |
1388 | ||
1389 | MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>"); | |
1390 | MODULE_DESCRIPTION("IrCOMM serial TTY driver"); | |
1391 | MODULE_LICENSE("GPL"); | |
1392 | MODULE_ALIAS_CHARDEV_MAJOR(IRCOMM_TTY_MAJOR); | |
1393 | ||
1394 | module_init(ircomm_tty_init); | |
1395 | module_exit(ircomm_tty_cleanup); |