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 | { | |
1da177e4 LT |
177 | IRDA_ASSERT(self != NULL, return;); |
178 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
179 | ||
180 | ircomm_tty_shutdown(self); | |
181 | ||
182 | self->magic = 0; | |
191c5f10 | 183 | tty_port_destroy(&self->port); |
1da177e4 LT |
184 | kfree(self); |
185 | } | |
186 | ||
187 | /* | |
188 | * Function ircomm_tty_cleanup () | |
189 | * | |
190 | * Remove IrCOMM TTY layer/driver | |
191 | * | |
192 | */ | |
193 | static void __exit ircomm_tty_cleanup(void) | |
194 | { | |
195 | int ret; | |
196 | ||
1da177e4 | 197 | ret = tty_unregister_driver(driver); |
6819bc2e | 198 | if (ret) { |
6c91023d JP |
199 | net_err_ratelimited("%s(), failed to unregister driver\n", |
200 | __func__); | |
1da177e4 LT |
201 | return; |
202 | } | |
203 | ||
204 | hashbin_delete(ircomm_tty, (FREE_FUNC) __ircomm_tty_cleanup); | |
205 | put_tty_driver(driver); | |
206 | } | |
207 | ||
208 | /* | |
209 | * Function ircomm_startup (self) | |
210 | * | |
6819bc2e | 211 | * |
1da177e4 LT |
212 | * |
213 | */ | |
214 | static int ircomm_tty_startup(struct ircomm_tty_cb *self) | |
215 | { | |
216 | notify_t notify; | |
217 | int ret = -ENODEV; | |
218 | ||
1da177e4 LT |
219 | IRDA_ASSERT(self != NULL, return -1;); |
220 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
221 | ||
222 | /* Check if already open */ | |
849d5a99 | 223 | if (test_and_set_bit(ASYNCB_INITIALIZED, &self->port.flags)) { |
955a9d20 | 224 | pr_debug("%s(), already open so break out!\n", __func__); |
1da177e4 LT |
225 | return 0; |
226 | } | |
227 | ||
228 | /* Register with IrCOMM */ | |
229 | irda_notify_init(¬ify); | |
230 | /* These callbacks we must handle ourselves */ | |
231 | notify.data_indication = ircomm_tty_data_indication; | |
232 | notify.udata_indication = ircomm_tty_control_indication; | |
6819bc2e | 233 | notify.flow_indication = ircomm_tty_flow_indication; |
1da177e4 LT |
234 | |
235 | /* Use the ircomm_tty interface for these ones */ | |
6819bc2e | 236 | notify.disconnect_indication = ircomm_tty_disconnect_indication; |
1da177e4 | 237 | notify.connect_confirm = ircomm_tty_connect_confirm; |
6819bc2e | 238 | notify.connect_indication = ircomm_tty_connect_indication; |
1da177e4 LT |
239 | strlcpy(notify.name, "ircomm_tty", sizeof(notify.name)); |
240 | notify.instance = self; | |
241 | ||
242 | if (!self->ircomm) { | |
6819bc2e | 243 | self->ircomm = ircomm_open(¬ify, self->service_type, |
1da177e4 LT |
244 | self->line); |
245 | } | |
246 | if (!self->ircomm) | |
247 | goto err; | |
248 | ||
249 | self->slsap_sel = self->ircomm->slsap_sel; | |
250 | ||
251 | /* Connect IrCOMM link with remote device */ | |
252 | ret = ircomm_tty_attach_cable(self); | |
253 | if (ret < 0) { | |
6c91023d | 254 | net_err_ratelimited("%s(), error attaching cable!\n", __func__); |
1da177e4 LT |
255 | goto err; |
256 | } | |
257 | ||
258 | return 0; | |
259 | err: | |
849d5a99 | 260 | clear_bit(ASYNCB_INITIALIZED, &self->port.flags); |
1da177e4 LT |
261 | return ret; |
262 | } | |
263 | ||
264 | /* | |
265 | * Function ircomm_block_til_ready (self, filp) | |
266 | * | |
6819bc2e | 267 | * |
1da177e4 LT |
268 | * |
269 | */ | |
6819bc2e | 270 | static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self, |
62f228ac | 271 | struct tty_struct *tty, struct file *filp) |
1da177e4 | 272 | { |
38c58032 | 273 | struct tty_port *port = &self->port; |
1da177e4 LT |
274 | DECLARE_WAITQUEUE(wait, current); |
275 | int retval; | |
a4ed2e73 | 276 | int do_clocal = 0; |
1da177e4 | 277 | unsigned long flags; |
6819bc2e | 278 | |
1da177e4 LT |
279 | /* |
280 | * If non-blocking mode is set, or the port is not enabled, | |
281 | * then make the check up front and then exit. | |
6819bc2e | 282 | */ |
f74861ca PH |
283 | if (test_bit(TTY_IO_ERROR, &tty->flags)) { |
284 | port->flags |= ASYNC_NORMAL_ACTIVE; | |
285 | return 0; | |
286 | } | |
287 | ||
288 | if (filp->f_flags & O_NONBLOCK) { | |
289 | /* nonblock mode is set */ | |
290 | if (tty->termios.c_cflag & CBAUD) | |
291 | tty_port_raise_dtr_rts(port); | |
38c58032 | 292 | port->flags |= ASYNC_NORMAL_ACTIVE; |
955a9d20 | 293 | pr_debug("%s(), O_NONBLOCK requested!\n", __func__); |
1da177e4 LT |
294 | return 0; |
295 | } | |
296 | ||
adc8d746 | 297 | if (tty->termios.c_cflag & CLOCAL) { |
955a9d20 | 298 | pr_debug("%s(), doing CLOCAL!\n", __func__); |
1da177e4 LT |
299 | do_clocal = 1; |
300 | } | |
6819bc2e | 301 | |
1da177e4 LT |
302 | /* Wait for carrier detect and the line to become |
303 | * free (i.e., not in use by the callout). While we are in | |
38c58032 | 304 | * this loop, port->count is dropped by one, so that |
1da177e4 LT |
305 | * mgsl_close() knows when to free things. We restore it upon |
306 | * exit, either normal or abnormal. | |
307 | */ | |
6819bc2e | 308 | |
1da177e4 | 309 | retval = 0; |
38c58032 | 310 | add_wait_queue(&port->open_wait, &wait); |
6819bc2e | 311 | |
955a9d20 JP |
312 | pr_debug("%s(%d):block_til_ready before block on %s open_count=%d\n", |
313 | __FILE__, __LINE__, tty->driver->name, port->count); | |
1da177e4 | 314 | |
38c58032 | 315 | spin_lock_irqsave(&port->lock, flags); |
e359a4e3 | 316 | port->count--; |
38c58032 | 317 | port->blocked_open++; |
2f7c069b | 318 | spin_unlock_irqrestore(&port->lock, flags); |
6819bc2e | 319 | |
1da177e4 | 320 | while (1) { |
e1c969f7 | 321 | if (C_BAUD(tty) && test_bit(ASYNCB_INITIALIZED, &port->flags)) |
0ba9ff84 | 322 | tty_port_raise_dtr_rts(port); |
6819bc2e | 323 | |
0b176ce3 | 324 | set_current_state(TASK_INTERRUPTIBLE); |
6819bc2e | 325 | |
1da177e4 | 326 | if (tty_hung_up_p(filp) || |
38c58032 JS |
327 | !test_bit(ASYNCB_INITIALIZED, &port->flags)) { |
328 | retval = (port->flags & ASYNC_HUP_NOTIFY) ? | |
1da177e4 LT |
329 | -EAGAIN : -ERESTARTSYS; |
330 | break; | |
331 | } | |
6819bc2e YH |
332 | |
333 | /* | |
1da177e4 LT |
334 | * Check if link is ready now. Even if CLOCAL is |
335 | * specified, we cannot return before the IrCOMM link is | |
6819bc2e | 336 | * ready |
1da177e4 | 337 | */ |
38c58032 | 338 | if (!test_bit(ASYNCB_CLOSING, &port->flags) && |
0ba9ff84 | 339 | (do_clocal || tty_port_carrier_raised(port)) && |
1da177e4 LT |
340 | self->state == IRCOMM_TTY_READY) |
341 | { | |
6819bc2e | 342 | break; |
1da177e4 | 343 | } |
6819bc2e | 344 | |
1da177e4 LT |
345 | if (signal_pending(current)) { |
346 | retval = -ERESTARTSYS; | |
347 | break; | |
348 | } | |
6819bc2e | 349 | |
955a9d20 JP |
350 | pr_debug("%s(%d):block_til_ready blocking on %s open_count=%d\n", |
351 | __FILE__, __LINE__, tty->driver->name, port->count); | |
6819bc2e | 352 | |
1da177e4 LT |
353 | schedule(); |
354 | } | |
6819bc2e | 355 | |
1da177e4 | 356 | __set_current_state(TASK_RUNNING); |
38c58032 | 357 | remove_wait_queue(&port->open_wait, &wait); |
6819bc2e | 358 | |
a4ed2e73 PH |
359 | spin_lock_irqsave(&port->lock, flags); |
360 | if (!tty_hung_up_p(filp)) | |
38c58032 | 361 | port->count++; |
38c58032 | 362 | port->blocked_open--; |
2f7c069b | 363 | spin_unlock_irqrestore(&port->lock, flags); |
6819bc2e | 364 | |
955a9d20 JP |
365 | pr_debug("%s(%d):block_til_ready after blocking on %s open_count=%d\n", |
366 | __FILE__, __LINE__, tty->driver->name, port->count); | |
6819bc2e | 367 | |
1da177e4 | 368 | if (!retval) |
38c58032 | 369 | port->flags |= ASYNC_NORMAL_ACTIVE; |
6819bc2e YH |
370 | |
371 | return retval; | |
1da177e4 LT |
372 | } |
373 | ||
9c650ffc JS |
374 | |
375 | static int ircomm_tty_install(struct tty_driver *driver, struct tty_struct *tty) | |
1da177e4 LT |
376 | { |
377 | struct ircomm_tty_cb *self; | |
410235fd | 378 | unsigned int line = tty->index; |
1da177e4 | 379 | |
1da177e4 LT |
380 | /* Check if instance already exists */ |
381 | self = hashbin_lock_find(ircomm_tty, line, NULL); | |
382 | if (!self) { | |
383 | /* No, so make new instance */ | |
0da974f4 | 384 | self = kzalloc(sizeof(struct ircomm_tty_cb), GFP_KERNEL); |
6c91023d | 385 | if (self == NULL) |
1da177e4 | 386 | return -ENOMEM; |
6819bc2e | 387 | |
a3cc9fcf | 388 | tty_port_init(&self->port); |
0ba9ff84 | 389 | self->port.ops = &ircomm_port_ops; |
1da177e4 LT |
390 | self->magic = IRCOMM_TTY_MAGIC; |
391 | self->flow = FLOW_STOP; | |
392 | ||
393 | self->line = line; | |
c4028958 | 394 | INIT_WORK(&self->tqueue, ircomm_tty_do_softint); |
1da177e4 LT |
395 | self->max_header_size = IRCOMM_TTY_HDR_UNINITIALISED; |
396 | self->max_data_size = IRCOMM_TTY_DATA_UNINITIALISED; | |
1da177e4 LT |
397 | |
398 | /* Init some important stuff */ | |
399 | init_timer(&self->watchdog_timer); | |
1da177e4 LT |
400 | spin_lock_init(&self->spinlock); |
401 | ||
6819bc2e | 402 | /* |
1da177e4 LT |
403 | * Force TTY into raw mode by default which is usually what |
404 | * we want for IrCOMM and IrLPT. This way applications will | |
6819bc2e | 405 | * not have to twiddle with printcap etc. |
ad36b88e AC |
406 | * |
407 | * Note this is completely usafe and doesn't work properly | |
1da177e4 | 408 | */ |
adc8d746 AC |
409 | tty->termios.c_iflag = 0; |
410 | tty->termios.c_oflag = 0; | |
1da177e4 LT |
411 | |
412 | /* Insert into hash */ | |
413 | hashbin_insert(ircomm_tty, (irda_queue_t *) self, line, NULL); | |
414 | } | |
9c650ffc | 415 | |
6f560125 SL |
416 | tty->driver_data = self; |
417 | ||
9c650ffc JS |
418 | return tty_port_install(&self->port, driver, tty); |
419 | } | |
420 | ||
421 | /* | |
422 | * Function ircomm_tty_open (tty, filp) | |
423 | * | |
424 | * This routine is called when a particular tty device is opened. This | |
425 | * routine is mandatory; if this routine is not filled in, the attempted | |
426 | * open will fail with ENODEV. | |
427 | */ | |
428 | static int ircomm_tty_open(struct tty_struct *tty, struct file *filp) | |
429 | { | |
430 | struct ircomm_tty_cb *self = tty->driver_data; | |
431 | unsigned long flags; | |
432 | int ret; | |
433 | ||
1da177e4 | 434 | /* ++ is not atomic, so this should be protected - Jean II */ |
e673927d | 435 | spin_lock_irqsave(&self->port.lock, flags); |
580d27b4 | 436 | self->port.count++; |
e673927d | 437 | spin_unlock_irqrestore(&self->port.lock, flags); |
62f228ac | 438 | tty_port_tty_set(&self->port, tty); |
1da177e4 | 439 | |
955a9d20 JP |
440 | pr_debug("%s(), %s%d, count = %d\n", __func__ , tty->driver->name, |
441 | self->line, self->port.count); | |
1da177e4 LT |
442 | |
443 | /* Not really used by us, but lets do it anyway */ | |
d6c53c0e | 444 | self->port.low_latency = (self->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0; |
1da177e4 LT |
445 | |
446 | /* | |
447 | * If the port is the middle of closing, bail out now | |
448 | */ | |
e359a4e3 | 449 | if (test_bit(ASYNCB_CLOSING, &self->port.flags)) { |
1da177e4 LT |
450 | |
451 | /* Hm, why are we blocking on ASYNC_CLOSING if we | |
452 | * do return -EAGAIN/-ERESTARTSYS below anyway? | |
453 | * IMHO it's either not needed in the first place | |
454 | * or for some reason we need to make sure the async | |
455 | * closing has been finished - if so, wouldn't we | |
456 | * probably better sleep uninterruptible? | |
457 | */ | |
458 | ||
a3cc9fcf | 459 | if (wait_event_interruptible(self->port.close_wait, |
849d5a99 | 460 | !test_bit(ASYNCB_CLOSING, &self->port.flags))) { |
6c91023d JP |
461 | net_warn_ratelimited("%s - got signal while blocking on ASYNC_CLOSING!\n", |
462 | __func__); | |
1da177e4 LT |
463 | return -ERESTARTSYS; |
464 | } | |
465 | ||
466 | #ifdef SERIAL_DO_RESTART | |
849d5a99 | 467 | return (self->port.flags & ASYNC_HUP_NOTIFY) ? |
a02cec21 | 468 | -EAGAIN : -ERESTARTSYS; |
1da177e4 LT |
469 | #else |
470 | return -EAGAIN; | |
471 | #endif | |
472 | } | |
473 | ||
474 | /* Check if this is a "normal" ircomm device, or an irlpt device */ | |
9c650ffc | 475 | if (self->line < 0x10) { |
1da177e4 LT |
476 | self->service_type = IRCOMM_3_WIRE | IRCOMM_9_WIRE; |
477 | self->settings.service_type = IRCOMM_9_WIRE; /* 9 wire as default */ | |
478 | /* Jan Kiszka -> add DSR/RI -> Conform to IrCOMM spec */ | |
479 | self->settings.dce = IRCOMM_CTS | IRCOMM_CD | IRCOMM_DSR | IRCOMM_RI; /* Default line settings */ | |
955a9d20 | 480 | pr_debug("%s(), IrCOMM device\n", __func__); |
1da177e4 | 481 | } else { |
955a9d20 | 482 | pr_debug("%s(), IrLPT device\n", __func__); |
1da177e4 LT |
483 | self->service_type = IRCOMM_3_WIRE_RAW; |
484 | self->settings.service_type = IRCOMM_3_WIRE_RAW; /* Default */ | |
485 | } | |
486 | ||
487 | ret = ircomm_tty_startup(self); | |
488 | if (ret) | |
489 | return ret; | |
490 | ||
62f228ac | 491 | ret = ircomm_tty_block_til_ready(self, tty, filp); |
1da177e4 | 492 | if (ret) { |
955a9d20 JP |
493 | pr_debug("%s(), returning after block_til_ready with %d\n", |
494 | __func__, ret); | |
1da177e4 LT |
495 | |
496 | return ret; | |
497 | } | |
498 | return 0; | |
499 | } | |
500 | ||
501 | /* | |
502 | * Function ircomm_tty_close (tty, filp) | |
503 | * | |
504 | * This routine is called when a particular tty device is closed. | |
505 | * | |
506 | */ | |
507 | static void ircomm_tty_close(struct tty_struct *tty, struct file *filp) | |
508 | { | |
509 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
38c58032 | 510 | struct tty_port *port = &self->port; |
1da177e4 | 511 | |
1da177e4 LT |
512 | IRDA_ASSERT(self != NULL, return;); |
513 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
514 | ||
c0e78650 | 515 | if (tty_port_close_start(port, tty, filp) == 0) |
1da177e4 | 516 | return; |
1da177e4 LT |
517 | |
518 | ircomm_tty_shutdown(self); | |
519 | ||
f34d7a5b | 520 | tty_driver_flush_buffer(tty); |
1da177e4 | 521 | |
a1e84403 | 522 | tty_port_close_end(port, tty); |
38c58032 | 523 | tty_port_tty_set(port, NULL); |
1da177e4 LT |
524 | } |
525 | ||
526 | /* | |
527 | * Function ircomm_tty_flush_buffer (tty) | |
528 | * | |
6819bc2e | 529 | * |
1da177e4 LT |
530 | * |
531 | */ | |
532 | static void ircomm_tty_flush_buffer(struct tty_struct *tty) | |
533 | { | |
534 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
535 | ||
536 | IRDA_ASSERT(self != NULL, return;); | |
537 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
538 | ||
6819bc2e YH |
539 | /* |
540 | * Let do_softint() do this to avoid race condition with | |
541 | * do_softint() ;-) | |
1da177e4 LT |
542 | */ |
543 | schedule_work(&self->tqueue); | |
544 | } | |
545 | ||
546 | /* | |
c4028958 | 547 | * Function ircomm_tty_do_softint (work) |
1da177e4 LT |
548 | * |
549 | * We use this routine to give the write wakeup to the user at at a | |
6819bc2e | 550 | * safe time (as fast as possible after write have completed). This |
1da177e4 LT |
551 | * can be compared to the Tx interrupt. |
552 | */ | |
c4028958 | 553 | static void ircomm_tty_do_softint(struct work_struct *work) |
1da177e4 | 554 | { |
c4028958 DH |
555 | struct ircomm_tty_cb *self = |
556 | container_of(work, struct ircomm_tty_cb, tqueue); | |
1da177e4 LT |
557 | struct tty_struct *tty; |
558 | unsigned long flags; | |
559 | struct sk_buff *skb, *ctrl_skb; | |
560 | ||
1da177e4 LT |
561 | if (!self || self->magic != IRCOMM_TTY_MAGIC) |
562 | return; | |
563 | ||
62f228ac | 564 | tty = tty_port_tty_get(&self->port); |
1da177e4 LT |
565 | if (!tty) |
566 | return; | |
567 | ||
568 | /* Unlink control buffer */ | |
569 | spin_lock_irqsave(&self->spinlock, flags); | |
570 | ||
571 | ctrl_skb = self->ctrl_skb; | |
572 | self->ctrl_skb = NULL; | |
573 | ||
574 | spin_unlock_irqrestore(&self->spinlock, flags); | |
575 | ||
576 | /* Flush control buffer if any */ | |
577 | if(ctrl_skb) { | |
578 | if(self->flow == FLOW_START) | |
579 | ircomm_control_request(self->ircomm, ctrl_skb); | |
580 | /* Drop reference count - see ircomm_ttp_data_request(). */ | |
581 | dev_kfree_skb(ctrl_skb); | |
582 | } | |
583 | ||
584 | if (tty->hw_stopped) | |
62f228ac | 585 | goto put; |
1da177e4 LT |
586 | |
587 | /* Unlink transmit buffer */ | |
588 | spin_lock_irqsave(&self->spinlock, flags); | |
6819bc2e | 589 | |
1da177e4 LT |
590 | skb = self->tx_skb; |
591 | self->tx_skb = NULL; | |
592 | ||
593 | spin_unlock_irqrestore(&self->spinlock, flags); | |
594 | ||
595 | /* Flush transmit buffer if any */ | |
596 | if (skb) { | |
597 | ircomm_tty_do_event(self, IRCOMM_TTY_DATA_REQUEST, skb, NULL); | |
598 | /* Drop reference count - see ircomm_ttp_data_request(). */ | |
599 | dev_kfree_skb(skb); | |
600 | } | |
6819bc2e | 601 | |
1da177e4 | 602 | /* Check if user (still) wants to be waken up */ |
a352def2 | 603 | tty_wakeup(tty); |
62f228ac JS |
604 | put: |
605 | tty_kref_put(tty); | |
1da177e4 LT |
606 | } |
607 | ||
608 | /* | |
609 | * Function ircomm_tty_write (tty, buf, count) | |
610 | * | |
611 | * This routine is called by the kernel to write a series of characters | |
612 | * to the tty device. The characters may come from user space or kernel | |
613 | * space. This routine will return the number of characters actually | |
614 | * accepted for writing. This routine is mandatory. | |
615 | */ | |
616 | static int ircomm_tty_write(struct tty_struct *tty, | |
617 | const unsigned char *buf, int count) | |
618 | { | |
619 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
620 | unsigned long flags; | |
621 | struct sk_buff *skb; | |
622 | int tailroom = 0; | |
623 | int len = 0; | |
624 | int size; | |
625 | ||
955a9d20 JP |
626 | pr_debug("%s(), count=%d, hw_stopped=%d\n", __func__ , count, |
627 | tty->hw_stopped); | |
1da177e4 LT |
628 | |
629 | IRDA_ASSERT(self != NULL, return -1;); | |
630 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
631 | ||
632 | /* We may receive packets from the TTY even before we have finished | |
633 | * our setup. Not cool. | |
634 | * The problem is that we don't know the final header and data size | |
635 | * to create the proper skb, so any skb we would create would have | |
636 | * bogus header and data size, so need care. | |
637 | * We use a bogus header size to safely detect this condition. | |
638 | * Another problem is that hw_stopped was set to 0 way before it | |
639 | * should be, so we would drop this skb. It should now be fixed. | |
640 | * One option is to not accept data until we are properly setup. | |
641 | * But, I suspect that when it happens, the ppp line discipline | |
642 | * just "drops" the data, which might screw up connect scripts. | |
643 | * The second option is to create a "safe skb", with large header | |
644 | * and small size (see ircomm_tty_open() for values). | |
645 | * We just need to make sure that when the real values get filled, | |
646 | * we don't mess up the original "safe skb" (see tx_data_size). | |
647 | * Jean II */ | |
648 | if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) { | |
955a9d20 | 649 | pr_debug("%s() : not initialised\n", __func__); |
1da177e4 LT |
650 | #ifdef IRCOMM_NO_TX_BEFORE_INIT |
651 | /* We didn't consume anything, TTY will retry */ | |
652 | return 0; | |
653 | #endif | |
654 | } | |
655 | ||
656 | if (count < 1) | |
657 | return 0; | |
658 | ||
659 | /* Protect our manipulation of self->tx_skb and related */ | |
660 | spin_lock_irqsave(&self->spinlock, flags); | |
661 | ||
662 | /* Fetch current transmit buffer */ | |
663 | skb = self->tx_skb; | |
664 | ||
6819bc2e | 665 | /* |
1da177e4 LT |
666 | * Send out all the data we get, possibly as multiple fragmented |
667 | * frames, but this will only happen if the data is larger than the | |
668 | * max data size. The normal case however is just the opposite, and | |
669 | * this function may be called multiple times, and will then actually | |
6819bc2e | 670 | * defragment the data and send it out as one packet as soon as |
1da177e4 LT |
671 | * possible, but at a safer point in time |
672 | */ | |
673 | while (count) { | |
674 | size = count; | |
675 | ||
676 | /* Adjust data size to the max data size */ | |
677 | if (size > self->max_data_size) | |
678 | size = self->max_data_size; | |
6819bc2e YH |
679 | |
680 | /* | |
1da177e4 | 681 | * Do we already have a buffer ready for transmit, or do |
6819bc2e | 682 | * we need to allocate a new frame |
1da177e4 | 683 | */ |
6819bc2e YH |
684 | if (skb) { |
685 | /* | |
686 | * Any room for more data at the end of the current | |
1da177e4 | 687 | * transmit buffer? Cannot use skb_tailroom, since |
6819bc2e | 688 | * dev_alloc_skb gives us a larger skb than we |
1da177e4 LT |
689 | * requested |
690 | * Note : use tx_data_size, because max_data_size | |
691 | * may have changed and we don't want to overwrite | |
692 | * the skb. - Jean II | |
693 | */ | |
694 | if ((tailroom = (self->tx_data_size - skb->len)) > 0) { | |
695 | /* Adjust data to tailroom */ | |
696 | if (size > tailroom) | |
697 | size = tailroom; | |
698 | } else { | |
6819bc2e YH |
699 | /* |
700 | * Current transmit frame is full, so break | |
1da177e4 LT |
701 | * out, so we can send it as soon as possible |
702 | */ | |
703 | break; | |
704 | } | |
705 | } else { | |
706 | /* Prepare a full sized frame */ | |
485fb2c9 SO |
707 | skb = alloc_skb(self->max_data_size+ |
708 | self->max_header_size, | |
709 | GFP_ATOMIC); | |
1da177e4 LT |
710 | if (!skb) { |
711 | spin_unlock_irqrestore(&self->spinlock, flags); | |
712 | return -ENOBUFS; | |
713 | } | |
714 | skb_reserve(skb, self->max_header_size); | |
715 | self->tx_skb = skb; | |
716 | /* Remember skb size because max_data_size may | |
717 | * change later on - Jean II */ | |
718 | self->tx_data_size = self->max_data_size; | |
719 | } | |
720 | ||
721 | /* Copy data */ | |
722 | memcpy(skb_put(skb,size), buf + len, size); | |
723 | ||
724 | count -= size; | |
725 | len += size; | |
726 | } | |
727 | ||
728 | spin_unlock_irqrestore(&self->spinlock, flags); | |
729 | ||
6819bc2e | 730 | /* |
1da177e4 LT |
731 | * Schedule a new thread which will transmit the frame as soon |
732 | * as possible, but at a safe point in time. We do this so the | |
733 | * "user" can give us data multiple times, as PPP does (because of | |
734 | * its 256 byte tx buffer). We will then defragment and send out | |
6819bc2e | 735 | * all this data as one single packet. |
1da177e4 LT |
736 | */ |
737 | schedule_work(&self->tqueue); | |
6819bc2e | 738 | |
1da177e4 LT |
739 | return len; |
740 | } | |
741 | ||
742 | /* | |
743 | * Function ircomm_tty_write_room (tty) | |
744 | * | |
745 | * This routine returns the numbers of characters the tty driver will | |
746 | * accept for queuing to be written. This number is subject to change as | |
747 | * output buffers get emptied, or if the output flow control is acted. | |
748 | */ | |
749 | static int ircomm_tty_write_room(struct tty_struct *tty) | |
750 | { | |
751 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
752 | unsigned long flags; | |
753 | int ret; | |
754 | ||
755 | IRDA_ASSERT(self != NULL, return -1;); | |
756 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
757 | ||
758 | #ifdef IRCOMM_NO_TX_BEFORE_INIT | |
759 | /* max_header_size tells us if the channel is initialised or not. */ | |
760 | if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) | |
761 | /* Don't bother us yet */ | |
762 | return 0; | |
763 | #endif | |
764 | ||
765 | /* Check if we are allowed to transmit any data. | |
766 | * hw_stopped is the regular flow control. | |
767 | * Jean II */ | |
768 | if (tty->hw_stopped) | |
769 | ret = 0; | |
770 | else { | |
771 | spin_lock_irqsave(&self->spinlock, flags); | |
772 | if (self->tx_skb) | |
773 | ret = self->tx_data_size - self->tx_skb->len; | |
774 | else | |
775 | ret = self->max_data_size; | |
776 | spin_unlock_irqrestore(&self->spinlock, flags); | |
777 | } | |
955a9d20 | 778 | pr_debug("%s(), ret=%d\n", __func__ , ret); |
1da177e4 LT |
779 | |
780 | return ret; | |
781 | } | |
782 | ||
783 | /* | |
784 | * Function ircomm_tty_wait_until_sent (tty, timeout) | |
785 | * | |
786 | * This routine waits until the device has written out all of the | |
787 | * characters in its transmitter FIFO. | |
788 | */ | |
789 | static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout) | |
790 | { | |
791 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
792 | unsigned long orig_jiffies, poll_time; | |
793 | unsigned long flags; | |
6819bc2e | 794 | |
1da177e4 LT |
795 | IRDA_ASSERT(self != NULL, return;); |
796 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
797 | ||
798 | orig_jiffies = jiffies; | |
799 | ||
800 | /* Set poll time to 200 ms */ | |
801 | poll_time = IRDA_MIN(timeout, msecs_to_jiffies(200)); | |
802 | ||
803 | spin_lock_irqsave(&self->spinlock, flags); | |
804 | while (self->tx_skb && self->tx_skb->len) { | |
805 | spin_unlock_irqrestore(&self->spinlock, flags); | |
121caf57 | 806 | schedule_timeout_interruptible(poll_time); |
1da177e4 LT |
807 | spin_lock_irqsave(&self->spinlock, flags); |
808 | if (signal_pending(current)) | |
809 | break; | |
810 | if (timeout && time_after(jiffies, orig_jiffies + timeout)) | |
811 | break; | |
812 | } | |
813 | spin_unlock_irqrestore(&self->spinlock, flags); | |
814 | current->state = TASK_RUNNING; | |
815 | } | |
816 | ||
817 | /* | |
818 | * Function ircomm_tty_throttle (tty) | |
819 | * | |
820 | * This routine notifies the tty driver that input buffers for the line | |
821 | * discipline are close to full, and it should somehow signal that no | |
6819bc2e | 822 | * more characters should be sent to the tty. |
1da177e4 LT |
823 | */ |
824 | static void ircomm_tty_throttle(struct tty_struct *tty) | |
825 | { | |
826 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
827 | ||
1da177e4 LT |
828 | IRDA_ASSERT(self != NULL, return;); |
829 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
830 | ||
831 | /* Software flow control? */ | |
832 | if (I_IXOFF(tty)) | |
833 | ircomm_tty_send_xchar(tty, STOP_CHAR(tty)); | |
6819bc2e | 834 | |
1da177e4 | 835 | /* Hardware flow control? */ |
adc8d746 | 836 | if (tty->termios.c_cflag & CRTSCTS) { |
1da177e4 LT |
837 | self->settings.dte &= ~IRCOMM_RTS; |
838 | self->settings.dte |= IRCOMM_DELTA_RTS; | |
6819bc2e | 839 | |
1da177e4 LT |
840 | ircomm_param_request(self, IRCOMM_DTE, TRUE); |
841 | } | |
842 | ||
6819bc2e | 843 | ircomm_flow_request(self->ircomm, FLOW_STOP); |
1da177e4 LT |
844 | } |
845 | ||
846 | /* | |
847 | * Function ircomm_tty_unthrottle (tty) | |
848 | * | |
849 | * This routine notifies the tty drivers that it should signals that | |
850 | * characters can now be sent to the tty without fear of overrunning the | |
851 | * input buffers of the line disciplines. | |
852 | */ | |
853 | static void ircomm_tty_unthrottle(struct tty_struct *tty) | |
854 | { | |
855 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
856 | ||
1da177e4 LT |
857 | IRDA_ASSERT(self != NULL, return;); |
858 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
859 | ||
860 | /* Using software flow control? */ | |
861 | if (I_IXOFF(tty)) { | |
862 | ircomm_tty_send_xchar(tty, START_CHAR(tty)); | |
863 | } | |
864 | ||
865 | /* Using hardware flow control? */ | |
adc8d746 | 866 | if (tty->termios.c_cflag & CRTSCTS) { |
1da177e4 LT |
867 | self->settings.dte |= (IRCOMM_RTS|IRCOMM_DELTA_RTS); |
868 | ||
869 | ircomm_param_request(self, IRCOMM_DTE, TRUE); | |
955a9d20 | 870 | pr_debug("%s(), FLOW_START\n", __func__); |
1da177e4 | 871 | } |
6819bc2e | 872 | ircomm_flow_request(self->ircomm, FLOW_START); |
1da177e4 LT |
873 | } |
874 | ||
875 | /* | |
876 | * Function ircomm_tty_chars_in_buffer (tty) | |
877 | * | |
878 | * Indicates if there are any data in the buffer | |
879 | * | |
880 | */ | |
881 | static int ircomm_tty_chars_in_buffer(struct tty_struct *tty) | |
882 | { | |
883 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
884 | unsigned long flags; | |
885 | int len = 0; | |
886 | ||
887 | IRDA_ASSERT(self != NULL, return -1;); | |
888 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
889 | ||
890 | spin_lock_irqsave(&self->spinlock, flags); | |
891 | ||
892 | if (self->tx_skb) | |
893 | len = self->tx_skb->len; | |
894 | ||
895 | spin_unlock_irqrestore(&self->spinlock, flags); | |
896 | ||
897 | return len; | |
898 | } | |
899 | ||
900 | static void ircomm_tty_shutdown(struct ircomm_tty_cb *self) | |
901 | { | |
902 | unsigned long flags; | |
903 | ||
904 | IRDA_ASSERT(self != NULL, return;); | |
905 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
906 | ||
849d5a99 | 907 | if (!test_and_clear_bit(ASYNCB_INITIALIZED, &self->port.flags)) |
1da177e4 LT |
908 | return; |
909 | ||
910 | ircomm_tty_detach_cable(self); | |
911 | ||
912 | spin_lock_irqsave(&self->spinlock, flags); | |
913 | ||
914 | del_timer(&self->watchdog_timer); | |
6819bc2e | 915 | |
1da177e4 LT |
916 | /* Free parameter buffer */ |
917 | if (self->ctrl_skb) { | |
918 | dev_kfree_skb(self->ctrl_skb); | |
919 | self->ctrl_skb = NULL; | |
920 | } | |
921 | ||
922 | /* Free transmit buffer */ | |
923 | if (self->tx_skb) { | |
924 | dev_kfree_skb(self->tx_skb); | |
925 | self->tx_skb = NULL; | |
926 | } | |
927 | ||
928 | if (self->ircomm) { | |
929 | ircomm_close(self->ircomm); | |
930 | self->ircomm = NULL; | |
931 | } | |
932 | ||
933 | spin_unlock_irqrestore(&self->spinlock, flags); | |
934 | } | |
935 | ||
936 | /* | |
937 | * Function ircomm_tty_hangup (tty) | |
938 | * | |
939 | * This routine notifies the tty driver that it should hangup the tty | |
940 | * device. | |
6819bc2e | 941 | * |
1da177e4 LT |
942 | */ |
943 | static void ircomm_tty_hangup(struct tty_struct *tty) | |
944 | { | |
945 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
38c58032 | 946 | struct tty_port *port = &self->port; |
1da177e4 LT |
947 | unsigned long flags; |
948 | ||
1da177e4 LT |
949 | IRDA_ASSERT(self != NULL, return;); |
950 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
951 | ||
1da177e4 LT |
952 | /* ircomm_tty_flush_buffer(tty); */ |
953 | ircomm_tty_shutdown(self); | |
954 | ||
38c58032 JS |
955 | spin_lock_irqsave(&port->lock, flags); |
956 | port->flags &= ~ASYNC_NORMAL_ACTIVE; | |
957 | if (port->tty) { | |
958 | set_bit(TTY_IO_ERROR, &port->tty->flags); | |
959 | tty_kref_put(port->tty); | |
62f228ac | 960 | } |
38c58032 JS |
961 | port->tty = NULL; |
962 | port->count = 0; | |
963 | spin_unlock_irqrestore(&port->lock, flags); | |
1da177e4 | 964 | |
38c58032 | 965 | wake_up_interruptible(&port->open_wait); |
1da177e4 LT |
966 | } |
967 | ||
968 | /* | |
969 | * Function ircomm_tty_send_xchar (tty, ch) | |
970 | * | |
971 | * This routine is used to send a high-priority XON/XOFF character to | |
972 | * the device. | |
973 | */ | |
974 | static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch) | |
975 | { | |
955a9d20 | 976 | pr_debug("%s(), not impl\n", __func__); |
1da177e4 LT |
977 | } |
978 | ||
979 | /* | |
980 | * Function ircomm_tty_start (tty) | |
981 | * | |
982 | * This routine notifies the tty driver that it resume sending | |
6819bc2e | 983 | * characters to the tty device. |
1da177e4 LT |
984 | */ |
985 | void ircomm_tty_start(struct tty_struct *tty) | |
986 | { | |
987 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
988 | ||
989 | ircomm_flow_request(self->ircomm, FLOW_START); | |
990 | } | |
991 | ||
992 | /* | |
993 | * Function ircomm_tty_stop (tty) | |
994 | * | |
995 | * This routine notifies the tty driver that it should stop outputting | |
6819bc2e | 996 | * characters to the tty device. |
1da177e4 | 997 | */ |
6819bc2e | 998 | static void ircomm_tty_stop(struct tty_struct *tty) |
1da177e4 LT |
999 | { |
1000 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
1001 | ||
1002 | IRDA_ASSERT(self != NULL, return;); | |
1003 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
1004 | ||
1005 | ircomm_flow_request(self->ircomm, FLOW_STOP); | |
1006 | } | |
1007 | ||
1008 | /* | |
1009 | * Function ircomm_check_modem_status (self) | |
1010 | * | |
1011 | * Check for any changes in the DCE's line settings. This function should | |
1012 | * be called whenever the dce parameter settings changes, to update the | |
1013 | * flow control settings and other things | |
1014 | */ | |
1015 | void ircomm_tty_check_modem_status(struct ircomm_tty_cb *self) | |
1016 | { | |
1017 | struct tty_struct *tty; | |
1018 | int status; | |
1019 | ||
1da177e4 LT |
1020 | IRDA_ASSERT(self != NULL, return;); |
1021 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
1022 | ||
62f228ac | 1023 | tty = tty_port_tty_get(&self->port); |
1da177e4 LT |
1024 | |
1025 | status = self->settings.dce; | |
1026 | ||
1027 | if (status & IRCOMM_DCE_DELTA_ANY) { | |
1028 | /*wake_up_interruptible(&self->delta_msr_wait);*/ | |
1029 | } | |
849d5a99 | 1030 | if ((self->port.flags & ASYNC_CHECK_CD) && (status & IRCOMM_DELTA_CD)) { |
955a9d20 JP |
1031 | pr_debug("%s(), ircomm%d CD now %s...\n", __func__ , self->line, |
1032 | (status & IRCOMM_CD) ? "on" : "off"); | |
1da177e4 LT |
1033 | |
1034 | if (status & IRCOMM_CD) { | |
a3cc9fcf | 1035 | wake_up_interruptible(&self->port.open_wait); |
1da177e4 | 1036 | } else { |
955a9d20 | 1037 | pr_debug("%s(), Doing serial hangup..\n", __func__); |
1da177e4 LT |
1038 | if (tty) |
1039 | tty_hangup(tty); | |
1040 | ||
1041 | /* Hangup will remote the tty, so better break out */ | |
62f228ac | 1042 | goto put; |
1da177e4 LT |
1043 | } |
1044 | } | |
f21ec3d2 | 1045 | if (tty && tty_port_cts_enabled(&self->port)) { |
1da177e4 LT |
1046 | if (tty->hw_stopped) { |
1047 | if (status & IRCOMM_CTS) { | |
955a9d20 | 1048 | pr_debug("%s(), CTS tx start...\n", __func__); |
1da177e4 | 1049 | tty->hw_stopped = 0; |
6819bc2e | 1050 | |
1da177e4 | 1051 | /* Wake up processes blocked on open */ |
a3cc9fcf | 1052 | wake_up_interruptible(&self->port.open_wait); |
1da177e4 LT |
1053 | |
1054 | schedule_work(&self->tqueue); | |
62f228ac | 1055 | goto put; |
1da177e4 LT |
1056 | } |
1057 | } else { | |
1058 | if (!(status & IRCOMM_CTS)) { | |
955a9d20 | 1059 | pr_debug("%s(), CTS tx stop...\n", __func__); |
1da177e4 LT |
1060 | tty->hw_stopped = 1; |
1061 | } | |
1062 | } | |
1063 | } | |
62f228ac JS |
1064 | put: |
1065 | tty_kref_put(tty); | |
1da177e4 LT |
1066 | } |
1067 | ||
1068 | /* | |
1069 | * Function ircomm_tty_data_indication (instance, sap, skb) | |
1070 | * | |
1071 | * Handle incoming data, and deliver it to the line discipline | |
1072 | * | |
1073 | */ | |
1074 | static int ircomm_tty_data_indication(void *instance, void *sap, | |
1075 | struct sk_buff *skb) | |
1076 | { | |
1077 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; | |
62f228ac | 1078 | struct tty_struct *tty; |
1da177e4 | 1079 | |
1da177e4 LT |
1080 | IRDA_ASSERT(self != NULL, return -1;); |
1081 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
1082 | IRDA_ASSERT(skb != NULL, return -1;); | |
1083 | ||
62f228ac JS |
1084 | tty = tty_port_tty_get(&self->port); |
1085 | if (!tty) { | |
955a9d20 | 1086 | pr_debug("%s(), no tty!\n", __func__); |
1da177e4 LT |
1087 | return 0; |
1088 | } | |
1089 | ||
6819bc2e | 1090 | /* |
1da177e4 LT |
1091 | * If we receive data when hardware is stopped then something is wrong. |
1092 | * We try to poll the peers line settings to check if we are up todate. | |
6819bc2e | 1093 | * Devices like WinCE can do this, and since they don't send any |
1da177e4 LT |
1094 | * params, we can just as well declare the hardware for running. |
1095 | */ | |
62f228ac | 1096 | if (tty->hw_stopped && (self->flow == FLOW_START)) { |
955a9d20 | 1097 | pr_debug("%s(), polling for line settings!\n", __func__); |
1da177e4 LT |
1098 | ircomm_param_request(self, IRCOMM_POLL, TRUE); |
1099 | ||
1100 | /* We can just as well declare the hardware for running */ | |
1101 | ircomm_tty_send_initial_parameters(self); | |
1102 | ircomm_tty_link_established(self); | |
1103 | } | |
2e124b4a | 1104 | tty_kref_put(tty); |
1da177e4 | 1105 | |
6819bc2e | 1106 | /* |
cbfd1526 AV |
1107 | * Use flip buffer functions since the code may be called from interrupt |
1108 | * context | |
1da177e4 | 1109 | */ |
05c7cd39 | 1110 | tty_insert_flip_string(&self->port, skb->data, skb->len); |
2e124b4a | 1111 | tty_flip_buffer_push(&self->port); |
1da177e4 LT |
1112 | |
1113 | /* No need to kfree_skb - see ircomm_ttp_data_indication() */ | |
1114 | ||
1115 | return 0; | |
1116 | } | |
1117 | ||
1118 | /* | |
1119 | * Function ircomm_tty_control_indication (instance, sap, skb) | |
1120 | * | |
1121 | * Parse all incoming parameters (easy!) | |
1122 | * | |
1123 | */ | |
1124 | static int ircomm_tty_control_indication(void *instance, void *sap, | |
1125 | struct sk_buff *skb) | |
1126 | { | |
1127 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; | |
1128 | int clen; | |
1129 | ||
1da177e4 LT |
1130 | IRDA_ASSERT(self != NULL, return -1;); |
1131 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
1132 | IRDA_ASSERT(skb != NULL, return -1;); | |
1133 | ||
1134 | clen = skb->data[0]; | |
1135 | ||
6819bc2e | 1136 | irda_param_extract_all(self, skb->data+1, IRDA_MIN(skb->len-1, clen), |
1da177e4 LT |
1137 | &ircomm_param_info); |
1138 | ||
1139 | /* No need to kfree_skb - see ircomm_control_indication() */ | |
1140 | ||
1141 | return 0; | |
1142 | } | |
1143 | ||
1144 | /* | |
1145 | * Function ircomm_tty_flow_indication (instance, sap, cmd) | |
1146 | * | |
1147 | * This function is called by IrTTP when it wants us to slow down the | |
1148 | * transmission of data. We just mark the hardware as stopped, and wait | |
1149 | * for IrTTP to notify us that things are OK again. | |
1150 | */ | |
6819bc2e | 1151 | static void ircomm_tty_flow_indication(void *instance, void *sap, |
1da177e4 LT |
1152 | LOCAL_FLOW cmd) |
1153 | { | |
1154 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; | |
1155 | struct tty_struct *tty; | |
1156 | ||
1157 | IRDA_ASSERT(self != NULL, return;); | |
1158 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
1159 | ||
62f228ac | 1160 | tty = tty_port_tty_get(&self->port); |
1da177e4 LT |
1161 | |
1162 | switch (cmd) { | |
1163 | case FLOW_START: | |
955a9d20 | 1164 | pr_debug("%s(), hw start!\n", __func__); |
62f228ac JS |
1165 | if (tty) |
1166 | tty->hw_stopped = 0; | |
1da177e4 LT |
1167 | |
1168 | /* ircomm_tty_do_softint will take care of the rest */ | |
1169 | schedule_work(&self->tqueue); | |
1170 | break; | |
1171 | default: /* If we get here, something is very wrong, better stop */ | |
1172 | case FLOW_STOP: | |
955a9d20 | 1173 | pr_debug("%s(), hw stopped!\n", __func__); |
62f228ac JS |
1174 | if (tty) |
1175 | tty->hw_stopped = 1; | |
1da177e4 LT |
1176 | break; |
1177 | } | |
62f228ac JS |
1178 | |
1179 | tty_kref_put(tty); | |
1da177e4 LT |
1180 | self->flow = cmd; |
1181 | } | |
1182 | ||
92b05e13 | 1183 | #ifdef CONFIG_PROC_FS |
3d304176 | 1184 | static void ircomm_tty_line_info(struct ircomm_tty_cb *self, struct seq_file *m) |
1da177e4 | 1185 | { |
62f228ac | 1186 | struct tty_struct *tty; |
3d304176 | 1187 | char sep; |
1da177e4 | 1188 | |
3d304176 | 1189 | seq_printf(m, "State: %s\n", ircomm_tty_state[self->state]); |
1da177e4 | 1190 | |
3d304176 | 1191 | seq_puts(m, "Service type: "); |
1da177e4 | 1192 | if (self->service_type & IRCOMM_9_WIRE) |
3d304176 | 1193 | seq_puts(m, "9_WIRE"); |
1da177e4 | 1194 | else if (self->service_type & IRCOMM_3_WIRE) |
3d304176 | 1195 | seq_puts(m, "3_WIRE"); |
1da177e4 | 1196 | else if (self->service_type & IRCOMM_3_WIRE_RAW) |
3d304176 | 1197 | seq_puts(m, "3_WIRE_RAW"); |
1da177e4 | 1198 | else |
3d304176 AD |
1199 | seq_puts(m, "No common service type!\n"); |
1200 | seq_putc(m, '\n'); | |
1201 | ||
1202 | seq_printf(m, "Port name: %s\n", self->settings.port_name); | |
1203 | ||
1204 | seq_printf(m, "DTE status:"); | |
1205 | sep = ' '; | |
1206 | if (self->settings.dte & IRCOMM_RTS) { | |
1207 | seq_printf(m, "%cRTS", sep); | |
1208 | sep = '|'; | |
1209 | } | |
1210 | if (self->settings.dte & IRCOMM_DTR) { | |
1211 | seq_printf(m, "%cDTR", sep); | |
1212 | sep = '|'; | |
1213 | } | |
1214 | seq_putc(m, '\n'); | |
1215 | ||
1216 | seq_puts(m, "DCE status:"); | |
1217 | sep = ' '; | |
1218 | if (self->settings.dce & IRCOMM_CTS) { | |
1219 | seq_printf(m, "%cCTS", sep); | |
1220 | sep = '|'; | |
1221 | } | |
1222 | if (self->settings.dce & IRCOMM_DSR) { | |
1223 | seq_printf(m, "%cDSR", sep); | |
1224 | sep = '|'; | |
1225 | } | |
1226 | if (self->settings.dce & IRCOMM_CD) { | |
1227 | seq_printf(m, "%cCD", sep); | |
1228 | sep = '|'; | |
1229 | } | |
1230 | if (self->settings.dce & IRCOMM_RI) { | |
1231 | seq_printf(m, "%cRI", sep); | |
1232 | sep = '|'; | |
1233 | } | |
1234 | seq_putc(m, '\n'); | |
1235 | ||
1236 | seq_puts(m, "Configuration: "); | |
1da177e4 | 1237 | if (!self->settings.null_modem) |
3d304176 | 1238 | seq_puts(m, "DTE <-> DCE\n"); |
1da177e4 | 1239 | else |
3d304176 AD |
1240 | seq_puts(m, "DTE <-> DTE (null modem emulation)\n"); |
1241 | ||
1242 | seq_printf(m, "Data rate: %d\n", self->settings.data_rate); | |
1243 | ||
1244 | seq_puts(m, "Flow control:"); | |
1245 | sep = ' '; | |
1246 | if (self->settings.flow_control & IRCOMM_XON_XOFF_IN) { | |
1247 | seq_printf(m, "%cXON_XOFF_IN", sep); | |
1248 | sep = '|'; | |
1249 | } | |
1250 | if (self->settings.flow_control & IRCOMM_XON_XOFF_OUT) { | |
1251 | seq_printf(m, "%cXON_XOFF_OUT", sep); | |
1252 | sep = '|'; | |
1253 | } | |
1254 | if (self->settings.flow_control & IRCOMM_RTS_CTS_IN) { | |
1255 | seq_printf(m, "%cRTS_CTS_IN", sep); | |
1256 | sep = '|'; | |
1257 | } | |
1258 | if (self->settings.flow_control & IRCOMM_RTS_CTS_OUT) { | |
1259 | seq_printf(m, "%cRTS_CTS_OUT", sep); | |
1260 | sep = '|'; | |
1261 | } | |
1262 | if (self->settings.flow_control & IRCOMM_DSR_DTR_IN) { | |
1263 | seq_printf(m, "%cDSR_DTR_IN", sep); | |
1264 | sep = '|'; | |
1265 | } | |
1266 | if (self->settings.flow_control & IRCOMM_DSR_DTR_OUT) { | |
1267 | seq_printf(m, "%cDSR_DTR_OUT", sep); | |
1268 | sep = '|'; | |
1269 | } | |
1270 | if (self->settings.flow_control & IRCOMM_ENQ_ACK_IN) { | |
1271 | seq_printf(m, "%cENQ_ACK_IN", sep); | |
1272 | sep = '|'; | |
1273 | } | |
1274 | if (self->settings.flow_control & IRCOMM_ENQ_ACK_OUT) { | |
1275 | seq_printf(m, "%cENQ_ACK_OUT", sep); | |
1276 | sep = '|'; | |
1277 | } | |
1278 | seq_putc(m, '\n'); | |
1279 | ||
1280 | seq_puts(m, "Flags:"); | |
1281 | sep = ' '; | |
f21ec3d2 | 1282 | if (tty_port_cts_enabled(&self->port)) { |
3d304176 AD |
1283 | seq_printf(m, "%cASYNC_CTS_FLOW", sep); |
1284 | sep = '|'; | |
1285 | } | |
849d5a99 | 1286 | if (self->port.flags & ASYNC_CHECK_CD) { |
3d304176 AD |
1287 | seq_printf(m, "%cASYNC_CHECK_CD", sep); |
1288 | sep = '|'; | |
1289 | } | |
849d5a99 | 1290 | if (self->port.flags & ASYNC_INITIALIZED) { |
3d304176 AD |
1291 | seq_printf(m, "%cASYNC_INITIALIZED", sep); |
1292 | sep = '|'; | |
1293 | } | |
849d5a99 | 1294 | if (self->port.flags & ASYNC_LOW_LATENCY) { |
3d304176 AD |
1295 | seq_printf(m, "%cASYNC_LOW_LATENCY", sep); |
1296 | sep = '|'; | |
1297 | } | |
849d5a99 | 1298 | if (self->port.flags & ASYNC_CLOSING) { |
3d304176 AD |
1299 | seq_printf(m, "%cASYNC_CLOSING", sep); |
1300 | sep = '|'; | |
1301 | } | |
849d5a99 | 1302 | if (self->port.flags & ASYNC_NORMAL_ACTIVE) { |
3d304176 AD |
1303 | seq_printf(m, "%cASYNC_NORMAL_ACTIVE", sep); |
1304 | sep = '|'; | |
1305 | } | |
1306 | seq_putc(m, '\n'); | |
1307 | ||
1308 | seq_printf(m, "Role: %s\n", self->client ? "client" : "server"); | |
580d27b4 | 1309 | seq_printf(m, "Open count: %d\n", self->port.count); |
3d304176 AD |
1310 | seq_printf(m, "Max data size: %d\n", self->max_data_size); |
1311 | seq_printf(m, "Max header size: %d\n", self->max_header_size); | |
6819bc2e | 1312 | |
62f228ac JS |
1313 | tty = tty_port_tty_get(&self->port); |
1314 | if (tty) { | |
3d304176 | 1315 | seq_printf(m, "Hardware: %s\n", |
62f228ac JS |
1316 | tty->hw_stopped ? "Stopped" : "Running"); |
1317 | tty_kref_put(tty); | |
1318 | } | |
1da177e4 LT |
1319 | } |
1320 | ||
3d304176 | 1321 | static int ircomm_tty_proc_show(struct seq_file *m, void *v) |
1da177e4 LT |
1322 | { |
1323 | struct ircomm_tty_cb *self; | |
1da177e4 LT |
1324 | unsigned long flags; |
1325 | ||
1326 | spin_lock_irqsave(&ircomm_tty->hb_spinlock, flags); | |
1327 | ||
1328 | self = (struct ircomm_tty_cb *) hashbin_get_first(ircomm_tty); | |
3d304176 | 1329 | while (self != NULL) { |
1da177e4 LT |
1330 | if (self->magic != IRCOMM_TTY_MAGIC) |
1331 | break; | |
1332 | ||
3d304176 | 1333 | ircomm_tty_line_info(self, m); |
1da177e4 | 1334 | self = (struct ircomm_tty_cb *) hashbin_get_next(ircomm_tty); |
6819bc2e | 1335 | } |
1da177e4 | 1336 | spin_unlock_irqrestore(&ircomm_tty->hb_spinlock, flags); |
3d304176 AD |
1337 | return 0; |
1338 | } | |
1da177e4 | 1339 | |
3d304176 AD |
1340 | static int ircomm_tty_proc_open(struct inode *inode, struct file *file) |
1341 | { | |
1342 | return single_open(file, ircomm_tty_proc_show, NULL); | |
1da177e4 | 1343 | } |
3d304176 AD |
1344 | |
1345 | static const struct file_operations ircomm_tty_proc_fops = { | |
1346 | .owner = THIS_MODULE, | |
1347 | .open = ircomm_tty_proc_open, | |
1348 | .read = seq_read, | |
1349 | .llseek = seq_lseek, | |
1350 | .release = single_release, | |
1351 | }; | |
1da177e4 LT |
1352 | #endif /* CONFIG_PROC_FS */ |
1353 | ||
1354 | MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>"); | |
1355 | MODULE_DESCRIPTION("IrCOMM serial TTY driver"); | |
1356 | MODULE_LICENSE("GPL"); | |
1357 | MODULE_ALIAS_CHARDEV_MAJOR(IRCOMM_TTY_MAJOR); | |
1358 | ||
1359 | module_init(ircomm_tty_init); | |
1360 | module_exit(ircomm_tty_cleanup); |