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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> |
174cd4b1 | 35 | #include <linux/sched/signal.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 | ||
7c0f6ba6 | 43 | #include <linux/uaccess.h> |
1da177e4 LT |
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 */ | |
d41861ca | 223 | if (tty_port_initialized(&self->port)) { |
955a9d20 | 224 | pr_debug("%s(), already open so break out!\n", __func__); |
1da177e4 LT |
225 | return 0; |
226 | } | |
d41861ca | 227 | tty_port_set_initialized(&self->port, 1); |
1da177e4 LT |
228 | |
229 | /* Register with IrCOMM */ | |
230 | irda_notify_init(¬ify); | |
231 | /* These callbacks we must handle ourselves */ | |
232 | notify.data_indication = ircomm_tty_data_indication; | |
233 | notify.udata_indication = ircomm_tty_control_indication; | |
6819bc2e | 234 | notify.flow_indication = ircomm_tty_flow_indication; |
1da177e4 LT |
235 | |
236 | /* Use the ircomm_tty interface for these ones */ | |
6819bc2e | 237 | notify.disconnect_indication = ircomm_tty_disconnect_indication; |
1da177e4 | 238 | notify.connect_confirm = ircomm_tty_connect_confirm; |
6819bc2e | 239 | notify.connect_indication = ircomm_tty_connect_indication; |
1da177e4 LT |
240 | strlcpy(notify.name, "ircomm_tty", sizeof(notify.name)); |
241 | notify.instance = self; | |
242 | ||
243 | if (!self->ircomm) { | |
6819bc2e | 244 | self->ircomm = ircomm_open(¬ify, self->service_type, |
1da177e4 LT |
245 | self->line); |
246 | } | |
247 | if (!self->ircomm) | |
248 | goto err; | |
249 | ||
250 | self->slsap_sel = self->ircomm->slsap_sel; | |
251 | ||
252 | /* Connect IrCOMM link with remote device */ | |
253 | ret = ircomm_tty_attach_cable(self); | |
254 | if (ret < 0) { | |
6c91023d | 255 | net_err_ratelimited("%s(), error attaching cable!\n", __func__); |
1da177e4 LT |
256 | goto err; |
257 | } | |
258 | ||
259 | return 0; | |
260 | err: | |
d41861ca | 261 | tty_port_set_initialized(&self->port, 0); |
1da177e4 LT |
262 | return ret; |
263 | } | |
264 | ||
265 | /* | |
266 | * Function ircomm_block_til_ready (self, filp) | |
267 | * | |
6819bc2e | 268 | * |
1da177e4 LT |
269 | * |
270 | */ | |
6819bc2e | 271 | static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self, |
62f228ac | 272 | struct tty_struct *tty, struct file *filp) |
1da177e4 | 273 | { |
38c58032 | 274 | struct tty_port *port = &self->port; |
1da177e4 LT |
275 | DECLARE_WAITQUEUE(wait, current); |
276 | int retval; | |
a4ed2e73 | 277 | int do_clocal = 0; |
1da177e4 | 278 | unsigned long flags; |
6819bc2e | 279 | |
1da177e4 LT |
280 | /* |
281 | * If non-blocking mode is set, or the port is not enabled, | |
282 | * then make the check up front and then exit. | |
6819bc2e | 283 | */ |
18900ca6 | 284 | if (tty_io_error(tty)) { |
807c8d81 | 285 | tty_port_set_active(port, 1); |
f74861ca PH |
286 | return 0; |
287 | } | |
288 | ||
289 | if (filp->f_flags & O_NONBLOCK) { | |
290 | /* nonblock mode is set */ | |
9db276f8 | 291 | if (C_BAUD(tty)) |
f74861ca | 292 | tty_port_raise_dtr_rts(port); |
807c8d81 | 293 | tty_port_set_active(port, 1); |
955a9d20 | 294 | pr_debug("%s(), O_NONBLOCK requested!\n", __func__); |
1da177e4 LT |
295 | return 0; |
296 | } | |
297 | ||
9db276f8 | 298 | if (C_CLOCAL(tty)) { |
955a9d20 | 299 | pr_debug("%s(), doing CLOCAL!\n", __func__); |
1da177e4 LT |
300 | do_clocal = 1; |
301 | } | |
6819bc2e | 302 | |
1da177e4 LT |
303 | /* Wait for carrier detect and the line to become |
304 | * free (i.e., not in use by the callout). While we are in | |
38c58032 | 305 | * this loop, port->count is dropped by one, so that |
1da177e4 LT |
306 | * mgsl_close() knows when to free things. We restore it upon |
307 | * exit, either normal or abnormal. | |
308 | */ | |
6819bc2e | 309 | |
1da177e4 | 310 | retval = 0; |
38c58032 | 311 | add_wait_queue(&port->open_wait, &wait); |
6819bc2e | 312 | |
955a9d20 JP |
313 | pr_debug("%s(%d):block_til_ready before block on %s open_count=%d\n", |
314 | __FILE__, __LINE__, tty->driver->name, port->count); | |
1da177e4 | 315 | |
38c58032 | 316 | spin_lock_irqsave(&port->lock, flags); |
e359a4e3 | 317 | port->count--; |
38c58032 | 318 | port->blocked_open++; |
2f7c069b | 319 | spin_unlock_irqrestore(&port->lock, flags); |
6819bc2e | 320 | |
1da177e4 | 321 | while (1) { |
d41861ca | 322 | if (C_BAUD(tty) && tty_port_initialized(port)) |
0ba9ff84 | 323 | tty_port_raise_dtr_rts(port); |
6819bc2e | 324 | |
0b176ce3 | 325 | set_current_state(TASK_INTERRUPTIBLE); |
6819bc2e | 326 | |
d41861ca | 327 | if (tty_hung_up_p(filp) || !tty_port_initialized(port)) { |
38c58032 | 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 | */ |
fef062cb | 338 | if ((do_clocal || tty_port_carrier_raised(port)) && |
1da177e4 LT |
339 | self->state == IRCOMM_TTY_READY) |
340 | { | |
6819bc2e | 341 | break; |
1da177e4 | 342 | } |
6819bc2e | 343 | |
1da177e4 LT |
344 | if (signal_pending(current)) { |
345 | retval = -ERESTARTSYS; | |
346 | break; | |
347 | } | |
6819bc2e | 348 | |
955a9d20 JP |
349 | pr_debug("%s(%d):block_til_ready blocking on %s open_count=%d\n", |
350 | __FILE__, __LINE__, tty->driver->name, port->count); | |
6819bc2e | 351 | |
1da177e4 LT |
352 | schedule(); |
353 | } | |
6819bc2e | 354 | |
1da177e4 | 355 | __set_current_state(TASK_RUNNING); |
38c58032 | 356 | remove_wait_queue(&port->open_wait, &wait); |
6819bc2e | 357 | |
a4ed2e73 PH |
358 | spin_lock_irqsave(&port->lock, flags); |
359 | if (!tty_hung_up_p(filp)) | |
38c58032 | 360 | port->count++; |
38c58032 | 361 | port->blocked_open--; |
2f7c069b | 362 | spin_unlock_irqrestore(&port->lock, flags); |
6819bc2e | 363 | |
955a9d20 JP |
364 | pr_debug("%s(%d):block_til_ready after blocking on %s open_count=%d\n", |
365 | __FILE__, __LINE__, tty->driver->name, port->count); | |
6819bc2e | 366 | |
1da177e4 | 367 | if (!retval) |
807c8d81 | 368 | tty_port_set_active(port, 1); |
6819bc2e YH |
369 | |
370 | return retval; | |
1da177e4 LT |
371 | } |
372 | ||
9c650ffc JS |
373 | |
374 | static int ircomm_tty_install(struct tty_driver *driver, struct tty_struct *tty) | |
1da177e4 LT |
375 | { |
376 | struct ircomm_tty_cb *self; | |
410235fd | 377 | unsigned int line = tty->index; |
1da177e4 | 378 | |
1da177e4 LT |
379 | /* Check if instance already exists */ |
380 | self = hashbin_lock_find(ircomm_tty, line, NULL); | |
381 | if (!self) { | |
382 | /* No, so make new instance */ | |
0da974f4 | 383 | self = kzalloc(sizeof(struct ircomm_tty_cb), GFP_KERNEL); |
6c91023d | 384 | if (self == NULL) |
1da177e4 | 385 | return -ENOMEM; |
6819bc2e | 386 | |
a3cc9fcf | 387 | tty_port_init(&self->port); |
0ba9ff84 | 388 | self->port.ops = &ircomm_port_ops; |
1da177e4 LT |
389 | self->magic = IRCOMM_TTY_MAGIC; |
390 | self->flow = FLOW_STOP; | |
391 | ||
392 | self->line = line; | |
c4028958 | 393 | INIT_WORK(&self->tqueue, ircomm_tty_do_softint); |
1da177e4 LT |
394 | self->max_header_size = IRCOMM_TTY_HDR_UNINITIALISED; |
395 | self->max_data_size = IRCOMM_TTY_DATA_UNINITIALISED; | |
1da177e4 LT |
396 | |
397 | /* Init some important stuff */ | |
398 | init_timer(&self->watchdog_timer); | |
1da177e4 LT |
399 | spin_lock_init(&self->spinlock); |
400 | ||
6819bc2e | 401 | /* |
1da177e4 LT |
402 | * Force TTY into raw mode by default which is usually what |
403 | * we want for IrCOMM and IrLPT. This way applications will | |
6819bc2e | 404 | * not have to twiddle with printcap etc. |
ad36b88e AC |
405 | * |
406 | * Note this is completely usafe and doesn't work properly | |
1da177e4 | 407 | */ |
adc8d746 AC |
408 | tty->termios.c_iflag = 0; |
409 | tty->termios.c_oflag = 0; | |
1da177e4 LT |
410 | |
411 | /* Insert into hash */ | |
412 | hashbin_insert(ircomm_tty, (irda_queue_t *) self, line, NULL); | |
413 | } | |
9c650ffc | 414 | |
6f560125 SL |
415 | tty->driver_data = self; |
416 | ||
9c650ffc JS |
417 | return tty_port_install(&self->port, driver, tty); |
418 | } | |
419 | ||
420 | /* | |
421 | * Function ircomm_tty_open (tty, filp) | |
422 | * | |
423 | * This routine is called when a particular tty device is opened. This | |
424 | * routine is mandatory; if this routine is not filled in, the attempted | |
425 | * open will fail with ENODEV. | |
426 | */ | |
427 | static int ircomm_tty_open(struct tty_struct *tty, struct file *filp) | |
428 | { | |
429 | struct ircomm_tty_cb *self = tty->driver_data; | |
430 | unsigned long flags; | |
431 | int ret; | |
432 | ||
1da177e4 | 433 | /* ++ is not atomic, so this should be protected - Jean II */ |
e673927d | 434 | spin_lock_irqsave(&self->port.lock, flags); |
580d27b4 | 435 | self->port.count++; |
e673927d | 436 | spin_unlock_irqrestore(&self->port.lock, flags); |
62f228ac | 437 | tty_port_tty_set(&self->port, tty); |
1da177e4 | 438 | |
955a9d20 JP |
439 | pr_debug("%s(), %s%d, count = %d\n", __func__ , tty->driver->name, |
440 | self->line, self->port.count); | |
1da177e4 LT |
441 | |
442 | /* Not really used by us, but lets do it anyway */ | |
d6c53c0e | 443 | self->port.low_latency = (self->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0; |
1da177e4 | 444 | |
1da177e4 | 445 | /* Check if this is a "normal" ircomm device, or an irlpt device */ |
9c650ffc | 446 | if (self->line < 0x10) { |
1da177e4 LT |
447 | self->service_type = IRCOMM_3_WIRE | IRCOMM_9_WIRE; |
448 | self->settings.service_type = IRCOMM_9_WIRE; /* 9 wire as default */ | |
449 | /* Jan Kiszka -> add DSR/RI -> Conform to IrCOMM spec */ | |
450 | self->settings.dce = IRCOMM_CTS | IRCOMM_CD | IRCOMM_DSR | IRCOMM_RI; /* Default line settings */ | |
955a9d20 | 451 | pr_debug("%s(), IrCOMM device\n", __func__); |
1da177e4 | 452 | } else { |
955a9d20 | 453 | pr_debug("%s(), IrLPT device\n", __func__); |
1da177e4 LT |
454 | self->service_type = IRCOMM_3_WIRE_RAW; |
455 | self->settings.service_type = IRCOMM_3_WIRE_RAW; /* Default */ | |
456 | } | |
457 | ||
458 | ret = ircomm_tty_startup(self); | |
459 | if (ret) | |
460 | return ret; | |
461 | ||
62f228ac | 462 | ret = ircomm_tty_block_til_ready(self, tty, filp); |
1da177e4 | 463 | if (ret) { |
955a9d20 JP |
464 | pr_debug("%s(), returning after block_til_ready with %d\n", |
465 | __func__, ret); | |
1da177e4 LT |
466 | |
467 | return ret; | |
468 | } | |
469 | return 0; | |
470 | } | |
471 | ||
472 | /* | |
473 | * Function ircomm_tty_close (tty, filp) | |
474 | * | |
475 | * This routine is called when a particular tty device is closed. | |
476 | * | |
477 | */ | |
478 | static void ircomm_tty_close(struct tty_struct *tty, struct file *filp) | |
479 | { | |
480 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
38c58032 | 481 | struct tty_port *port = &self->port; |
1da177e4 | 482 | |
1da177e4 LT |
483 | IRDA_ASSERT(self != NULL, return;); |
484 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
485 | ||
c0e78650 | 486 | if (tty_port_close_start(port, tty, filp) == 0) |
1da177e4 | 487 | return; |
1da177e4 LT |
488 | |
489 | ircomm_tty_shutdown(self); | |
490 | ||
f34d7a5b | 491 | tty_driver_flush_buffer(tty); |
1da177e4 | 492 | |
a1e84403 | 493 | tty_port_close_end(port, tty); |
38c58032 | 494 | tty_port_tty_set(port, NULL); |
1da177e4 LT |
495 | } |
496 | ||
497 | /* | |
498 | * Function ircomm_tty_flush_buffer (tty) | |
499 | * | |
6819bc2e | 500 | * |
1da177e4 LT |
501 | * |
502 | */ | |
503 | static void ircomm_tty_flush_buffer(struct tty_struct *tty) | |
504 | { | |
505 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
506 | ||
507 | IRDA_ASSERT(self != NULL, return;); | |
508 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
509 | ||
6819bc2e YH |
510 | /* |
511 | * Let do_softint() do this to avoid race condition with | |
512 | * do_softint() ;-) | |
1da177e4 LT |
513 | */ |
514 | schedule_work(&self->tqueue); | |
515 | } | |
516 | ||
517 | /* | |
c4028958 | 518 | * Function ircomm_tty_do_softint (work) |
1da177e4 LT |
519 | * |
520 | * We use this routine to give the write wakeup to the user at at a | |
6819bc2e | 521 | * safe time (as fast as possible after write have completed). This |
1da177e4 LT |
522 | * can be compared to the Tx interrupt. |
523 | */ | |
c4028958 | 524 | static void ircomm_tty_do_softint(struct work_struct *work) |
1da177e4 | 525 | { |
c4028958 DH |
526 | struct ircomm_tty_cb *self = |
527 | container_of(work, struct ircomm_tty_cb, tqueue); | |
1da177e4 LT |
528 | struct tty_struct *tty; |
529 | unsigned long flags; | |
530 | struct sk_buff *skb, *ctrl_skb; | |
531 | ||
1da177e4 LT |
532 | if (!self || self->magic != IRCOMM_TTY_MAGIC) |
533 | return; | |
534 | ||
62f228ac | 535 | tty = tty_port_tty_get(&self->port); |
1da177e4 LT |
536 | if (!tty) |
537 | return; | |
538 | ||
539 | /* Unlink control buffer */ | |
540 | spin_lock_irqsave(&self->spinlock, flags); | |
541 | ||
542 | ctrl_skb = self->ctrl_skb; | |
543 | self->ctrl_skb = NULL; | |
544 | ||
545 | spin_unlock_irqrestore(&self->spinlock, flags); | |
546 | ||
547 | /* Flush control buffer if any */ | |
548 | if(ctrl_skb) { | |
549 | if(self->flow == FLOW_START) | |
550 | ircomm_control_request(self->ircomm, ctrl_skb); | |
551 | /* Drop reference count - see ircomm_ttp_data_request(). */ | |
552 | dev_kfree_skb(ctrl_skb); | |
553 | } | |
554 | ||
555 | if (tty->hw_stopped) | |
62f228ac | 556 | goto put; |
1da177e4 LT |
557 | |
558 | /* Unlink transmit buffer */ | |
559 | spin_lock_irqsave(&self->spinlock, flags); | |
6819bc2e | 560 | |
1da177e4 LT |
561 | skb = self->tx_skb; |
562 | self->tx_skb = NULL; | |
563 | ||
564 | spin_unlock_irqrestore(&self->spinlock, flags); | |
565 | ||
566 | /* Flush transmit buffer if any */ | |
567 | if (skb) { | |
568 | ircomm_tty_do_event(self, IRCOMM_TTY_DATA_REQUEST, skb, NULL); | |
569 | /* Drop reference count - see ircomm_ttp_data_request(). */ | |
570 | dev_kfree_skb(skb); | |
571 | } | |
6819bc2e | 572 | |
1da177e4 | 573 | /* Check if user (still) wants to be waken up */ |
a352def2 | 574 | tty_wakeup(tty); |
62f228ac JS |
575 | put: |
576 | tty_kref_put(tty); | |
1da177e4 LT |
577 | } |
578 | ||
579 | /* | |
580 | * Function ircomm_tty_write (tty, buf, count) | |
581 | * | |
582 | * This routine is called by the kernel to write a series of characters | |
583 | * to the tty device. The characters may come from user space or kernel | |
584 | * space. This routine will return the number of characters actually | |
585 | * accepted for writing. This routine is mandatory. | |
586 | */ | |
587 | static int ircomm_tty_write(struct tty_struct *tty, | |
588 | const unsigned char *buf, int count) | |
589 | { | |
590 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
591 | unsigned long flags; | |
592 | struct sk_buff *skb; | |
593 | int tailroom = 0; | |
594 | int len = 0; | |
595 | int size; | |
596 | ||
955a9d20 JP |
597 | pr_debug("%s(), count=%d, hw_stopped=%d\n", __func__ , count, |
598 | tty->hw_stopped); | |
1da177e4 LT |
599 | |
600 | IRDA_ASSERT(self != NULL, return -1;); | |
601 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
602 | ||
603 | /* We may receive packets from the TTY even before we have finished | |
604 | * our setup. Not cool. | |
605 | * The problem is that we don't know the final header and data size | |
606 | * to create the proper skb, so any skb we would create would have | |
607 | * bogus header and data size, so need care. | |
608 | * We use a bogus header size to safely detect this condition. | |
609 | * Another problem is that hw_stopped was set to 0 way before it | |
610 | * should be, so we would drop this skb. It should now be fixed. | |
611 | * One option is to not accept data until we are properly setup. | |
612 | * But, I suspect that when it happens, the ppp line discipline | |
613 | * just "drops" the data, which might screw up connect scripts. | |
614 | * The second option is to create a "safe skb", with large header | |
615 | * and small size (see ircomm_tty_open() for values). | |
616 | * We just need to make sure that when the real values get filled, | |
617 | * we don't mess up the original "safe skb" (see tx_data_size). | |
618 | * Jean II */ | |
619 | if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) { | |
955a9d20 | 620 | pr_debug("%s() : not initialised\n", __func__); |
1da177e4 LT |
621 | #ifdef IRCOMM_NO_TX_BEFORE_INIT |
622 | /* We didn't consume anything, TTY will retry */ | |
623 | return 0; | |
624 | #endif | |
625 | } | |
626 | ||
627 | if (count < 1) | |
628 | return 0; | |
629 | ||
630 | /* Protect our manipulation of self->tx_skb and related */ | |
631 | spin_lock_irqsave(&self->spinlock, flags); | |
632 | ||
633 | /* Fetch current transmit buffer */ | |
634 | skb = self->tx_skb; | |
635 | ||
6819bc2e | 636 | /* |
1da177e4 LT |
637 | * Send out all the data we get, possibly as multiple fragmented |
638 | * frames, but this will only happen if the data is larger than the | |
639 | * max data size. The normal case however is just the opposite, and | |
640 | * this function may be called multiple times, and will then actually | |
6819bc2e | 641 | * defragment the data and send it out as one packet as soon as |
1da177e4 LT |
642 | * possible, but at a safer point in time |
643 | */ | |
644 | while (count) { | |
645 | size = count; | |
646 | ||
647 | /* Adjust data size to the max data size */ | |
648 | if (size > self->max_data_size) | |
649 | size = self->max_data_size; | |
6819bc2e YH |
650 | |
651 | /* | |
1da177e4 | 652 | * Do we already have a buffer ready for transmit, or do |
6819bc2e | 653 | * we need to allocate a new frame |
1da177e4 | 654 | */ |
6819bc2e YH |
655 | if (skb) { |
656 | /* | |
657 | * Any room for more data at the end of the current | |
1da177e4 | 658 | * transmit buffer? Cannot use skb_tailroom, since |
6819bc2e | 659 | * dev_alloc_skb gives us a larger skb than we |
1da177e4 LT |
660 | * requested |
661 | * Note : use tx_data_size, because max_data_size | |
662 | * may have changed and we don't want to overwrite | |
663 | * the skb. - Jean II | |
664 | */ | |
665 | if ((tailroom = (self->tx_data_size - skb->len)) > 0) { | |
666 | /* Adjust data to tailroom */ | |
667 | if (size > tailroom) | |
668 | size = tailroom; | |
669 | } else { | |
6819bc2e YH |
670 | /* |
671 | * Current transmit frame is full, so break | |
1da177e4 LT |
672 | * out, so we can send it as soon as possible |
673 | */ | |
674 | break; | |
675 | } | |
676 | } else { | |
677 | /* Prepare a full sized frame */ | |
485fb2c9 SO |
678 | skb = alloc_skb(self->max_data_size+ |
679 | self->max_header_size, | |
680 | GFP_ATOMIC); | |
1da177e4 LT |
681 | if (!skb) { |
682 | spin_unlock_irqrestore(&self->spinlock, flags); | |
683 | return -ENOBUFS; | |
684 | } | |
685 | skb_reserve(skb, self->max_header_size); | |
686 | self->tx_skb = skb; | |
687 | /* Remember skb size because max_data_size may | |
688 | * change later on - Jean II */ | |
689 | self->tx_data_size = self->max_data_size; | |
690 | } | |
691 | ||
692 | /* Copy data */ | |
693 | memcpy(skb_put(skb,size), buf + len, size); | |
694 | ||
695 | count -= size; | |
696 | len += size; | |
697 | } | |
698 | ||
699 | spin_unlock_irqrestore(&self->spinlock, flags); | |
700 | ||
6819bc2e | 701 | /* |
1da177e4 LT |
702 | * Schedule a new thread which will transmit the frame as soon |
703 | * as possible, but at a safe point in time. We do this so the | |
704 | * "user" can give us data multiple times, as PPP does (because of | |
705 | * its 256 byte tx buffer). We will then defragment and send out | |
6819bc2e | 706 | * all this data as one single packet. |
1da177e4 LT |
707 | */ |
708 | schedule_work(&self->tqueue); | |
6819bc2e | 709 | |
1da177e4 LT |
710 | return len; |
711 | } | |
712 | ||
713 | /* | |
714 | * Function ircomm_tty_write_room (tty) | |
715 | * | |
716 | * This routine returns the numbers of characters the tty driver will | |
717 | * accept for queuing to be written. This number is subject to change as | |
718 | * output buffers get emptied, or if the output flow control is acted. | |
719 | */ | |
720 | static int ircomm_tty_write_room(struct tty_struct *tty) | |
721 | { | |
722 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
723 | unsigned long flags; | |
724 | int ret; | |
725 | ||
726 | IRDA_ASSERT(self != NULL, return -1;); | |
727 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
728 | ||
729 | #ifdef IRCOMM_NO_TX_BEFORE_INIT | |
730 | /* max_header_size tells us if the channel is initialised or not. */ | |
731 | if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) | |
732 | /* Don't bother us yet */ | |
733 | return 0; | |
734 | #endif | |
735 | ||
736 | /* Check if we are allowed to transmit any data. | |
737 | * hw_stopped is the regular flow control. | |
738 | * Jean II */ | |
739 | if (tty->hw_stopped) | |
740 | ret = 0; | |
741 | else { | |
742 | spin_lock_irqsave(&self->spinlock, flags); | |
743 | if (self->tx_skb) | |
744 | ret = self->tx_data_size - self->tx_skb->len; | |
745 | else | |
746 | ret = self->max_data_size; | |
747 | spin_unlock_irqrestore(&self->spinlock, flags); | |
748 | } | |
955a9d20 | 749 | pr_debug("%s(), ret=%d\n", __func__ , ret); |
1da177e4 LT |
750 | |
751 | return ret; | |
752 | } | |
753 | ||
754 | /* | |
755 | * Function ircomm_tty_wait_until_sent (tty, timeout) | |
756 | * | |
757 | * This routine waits until the device has written out all of the | |
758 | * characters in its transmitter FIFO. | |
759 | */ | |
760 | static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout) | |
761 | { | |
762 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
763 | unsigned long orig_jiffies, poll_time; | |
764 | unsigned long flags; | |
6819bc2e | 765 | |
1da177e4 LT |
766 | IRDA_ASSERT(self != NULL, return;); |
767 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
768 | ||
769 | orig_jiffies = jiffies; | |
770 | ||
771 | /* Set poll time to 200 ms */ | |
2c3fbe3c JH |
772 | poll_time = msecs_to_jiffies(200); |
773 | if (timeout) | |
774 | poll_time = min_t(unsigned long, timeout, poll_time); | |
1da177e4 LT |
775 | |
776 | spin_lock_irqsave(&self->spinlock, flags); | |
777 | while (self->tx_skb && self->tx_skb->len) { | |
778 | spin_unlock_irqrestore(&self->spinlock, flags); | |
121caf57 | 779 | schedule_timeout_interruptible(poll_time); |
1da177e4 LT |
780 | spin_lock_irqsave(&self->spinlock, flags); |
781 | if (signal_pending(current)) | |
782 | break; | |
783 | if (timeout && time_after(jiffies, orig_jiffies + timeout)) | |
784 | break; | |
785 | } | |
786 | spin_unlock_irqrestore(&self->spinlock, flags); | |
a948f8ce | 787 | __set_current_state(TASK_RUNNING); |
1da177e4 LT |
788 | } |
789 | ||
790 | /* | |
791 | * Function ircomm_tty_throttle (tty) | |
792 | * | |
793 | * This routine notifies the tty driver that input buffers for the line | |
794 | * discipline are close to full, and it should somehow signal that no | |
6819bc2e | 795 | * more characters should be sent to the tty. |
1da177e4 LT |
796 | */ |
797 | static void ircomm_tty_throttle(struct tty_struct *tty) | |
798 | { | |
799 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
800 | ||
1da177e4 LT |
801 | IRDA_ASSERT(self != NULL, return;); |
802 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
803 | ||
804 | /* Software flow control? */ | |
805 | if (I_IXOFF(tty)) | |
806 | ircomm_tty_send_xchar(tty, STOP_CHAR(tty)); | |
6819bc2e | 807 | |
1da177e4 | 808 | /* Hardware flow control? */ |
9db276f8 | 809 | if (C_CRTSCTS(tty)) { |
1da177e4 LT |
810 | self->settings.dte &= ~IRCOMM_RTS; |
811 | self->settings.dte |= IRCOMM_DELTA_RTS; | |
6819bc2e | 812 | |
1da177e4 LT |
813 | ircomm_param_request(self, IRCOMM_DTE, TRUE); |
814 | } | |
815 | ||
6819bc2e | 816 | ircomm_flow_request(self->ircomm, FLOW_STOP); |
1da177e4 LT |
817 | } |
818 | ||
819 | /* | |
820 | * Function ircomm_tty_unthrottle (tty) | |
821 | * | |
822 | * This routine notifies the tty drivers that it should signals that | |
823 | * characters can now be sent to the tty without fear of overrunning the | |
824 | * input buffers of the line disciplines. | |
825 | */ | |
826 | static void ircomm_tty_unthrottle(struct tty_struct *tty) | |
827 | { | |
828 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
829 | ||
1da177e4 LT |
830 | IRDA_ASSERT(self != NULL, return;); |
831 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
832 | ||
833 | /* Using software flow control? */ | |
9db276f8 | 834 | if (I_IXOFF(tty)) |
1da177e4 | 835 | ircomm_tty_send_xchar(tty, START_CHAR(tty)); |
1da177e4 LT |
836 | |
837 | /* Using hardware flow control? */ | |
9db276f8 | 838 | if (C_CRTSCTS(tty)) { |
1da177e4 LT |
839 | self->settings.dte |= (IRCOMM_RTS|IRCOMM_DELTA_RTS); |
840 | ||
841 | ircomm_param_request(self, IRCOMM_DTE, TRUE); | |
955a9d20 | 842 | pr_debug("%s(), FLOW_START\n", __func__); |
1da177e4 | 843 | } |
6819bc2e | 844 | ircomm_flow_request(self->ircomm, FLOW_START); |
1da177e4 LT |
845 | } |
846 | ||
847 | /* | |
848 | * Function ircomm_tty_chars_in_buffer (tty) | |
849 | * | |
850 | * Indicates if there are any data in the buffer | |
851 | * | |
852 | */ | |
853 | static int ircomm_tty_chars_in_buffer(struct tty_struct *tty) | |
854 | { | |
855 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
856 | unsigned long flags; | |
857 | int len = 0; | |
858 | ||
859 | IRDA_ASSERT(self != NULL, return -1;); | |
860 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
861 | ||
862 | spin_lock_irqsave(&self->spinlock, flags); | |
863 | ||
864 | if (self->tx_skb) | |
865 | len = self->tx_skb->len; | |
866 | ||
867 | spin_unlock_irqrestore(&self->spinlock, flags); | |
868 | ||
869 | return len; | |
870 | } | |
871 | ||
872 | static void ircomm_tty_shutdown(struct ircomm_tty_cb *self) | |
873 | { | |
874 | unsigned long flags; | |
875 | ||
876 | IRDA_ASSERT(self != NULL, return;); | |
877 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
878 | ||
d41861ca | 879 | if (!tty_port_initialized(&self->port)) |
1da177e4 | 880 | return; |
d41861ca | 881 | tty_port_set_initialized(&self->port, 0); |
1da177e4 LT |
882 | |
883 | ircomm_tty_detach_cable(self); | |
884 | ||
885 | spin_lock_irqsave(&self->spinlock, flags); | |
886 | ||
887 | del_timer(&self->watchdog_timer); | |
6819bc2e | 888 | |
1da177e4 LT |
889 | /* Free parameter buffer */ |
890 | if (self->ctrl_skb) { | |
891 | dev_kfree_skb(self->ctrl_skb); | |
892 | self->ctrl_skb = NULL; | |
893 | } | |
894 | ||
895 | /* Free transmit buffer */ | |
896 | if (self->tx_skb) { | |
897 | dev_kfree_skb(self->tx_skb); | |
898 | self->tx_skb = NULL; | |
899 | } | |
900 | ||
901 | if (self->ircomm) { | |
902 | ircomm_close(self->ircomm); | |
903 | self->ircomm = NULL; | |
904 | } | |
905 | ||
906 | spin_unlock_irqrestore(&self->spinlock, flags); | |
907 | } | |
908 | ||
909 | /* | |
910 | * Function ircomm_tty_hangup (tty) | |
911 | * | |
912 | * This routine notifies the tty driver that it should hangup the tty | |
913 | * device. | |
6819bc2e | 914 | * |
1da177e4 LT |
915 | */ |
916 | static void ircomm_tty_hangup(struct tty_struct *tty) | |
917 | { | |
918 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
38c58032 | 919 | struct tty_port *port = &self->port; |
1da177e4 LT |
920 | unsigned long flags; |
921 | ||
1da177e4 LT |
922 | IRDA_ASSERT(self != NULL, return;); |
923 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
924 | ||
1da177e4 LT |
925 | /* ircomm_tty_flush_buffer(tty); */ |
926 | ircomm_tty_shutdown(self); | |
927 | ||
38c58032 | 928 | spin_lock_irqsave(&port->lock, flags); |
38c58032 JS |
929 | if (port->tty) { |
930 | set_bit(TTY_IO_ERROR, &port->tty->flags); | |
931 | tty_kref_put(port->tty); | |
62f228ac | 932 | } |
38c58032 JS |
933 | port->tty = NULL; |
934 | port->count = 0; | |
935 | spin_unlock_irqrestore(&port->lock, flags); | |
807c8d81 | 936 | tty_port_set_active(port, 0); |
1da177e4 | 937 | |
38c58032 | 938 | wake_up_interruptible(&port->open_wait); |
1da177e4 LT |
939 | } |
940 | ||
941 | /* | |
942 | * Function ircomm_tty_send_xchar (tty, ch) | |
943 | * | |
944 | * This routine is used to send a high-priority XON/XOFF character to | |
945 | * the device. | |
946 | */ | |
947 | static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch) | |
948 | { | |
955a9d20 | 949 | pr_debug("%s(), not impl\n", __func__); |
1da177e4 LT |
950 | } |
951 | ||
952 | /* | |
953 | * Function ircomm_tty_start (tty) | |
954 | * | |
955 | * This routine notifies the tty driver that it resume sending | |
6819bc2e | 956 | * characters to the tty device. |
1da177e4 LT |
957 | */ |
958 | void ircomm_tty_start(struct tty_struct *tty) | |
959 | { | |
960 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
961 | ||
962 | ircomm_flow_request(self->ircomm, FLOW_START); | |
963 | } | |
964 | ||
965 | /* | |
966 | * Function ircomm_tty_stop (tty) | |
967 | * | |
968 | * This routine notifies the tty driver that it should stop outputting | |
6819bc2e | 969 | * characters to the tty device. |
1da177e4 | 970 | */ |
6819bc2e | 971 | static void ircomm_tty_stop(struct tty_struct *tty) |
1da177e4 LT |
972 | { |
973 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
974 | ||
975 | IRDA_ASSERT(self != NULL, return;); | |
976 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
977 | ||
978 | ircomm_flow_request(self->ircomm, FLOW_STOP); | |
979 | } | |
980 | ||
981 | /* | |
982 | * Function ircomm_check_modem_status (self) | |
983 | * | |
984 | * Check for any changes in the DCE's line settings. This function should | |
985 | * be called whenever the dce parameter settings changes, to update the | |
986 | * flow control settings and other things | |
987 | */ | |
988 | void ircomm_tty_check_modem_status(struct ircomm_tty_cb *self) | |
989 | { | |
990 | struct tty_struct *tty; | |
991 | int status; | |
992 | ||
1da177e4 LT |
993 | IRDA_ASSERT(self != NULL, return;); |
994 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
995 | ||
62f228ac | 996 | tty = tty_port_tty_get(&self->port); |
1da177e4 LT |
997 | |
998 | status = self->settings.dce; | |
999 | ||
1000 | if (status & IRCOMM_DCE_DELTA_ANY) { | |
1001 | /*wake_up_interruptible(&self->delta_msr_wait);*/ | |
1002 | } | |
2d68655d | 1003 | if (tty_port_check_carrier(&self->port) && (status & IRCOMM_DELTA_CD)) { |
955a9d20 JP |
1004 | pr_debug("%s(), ircomm%d CD now %s...\n", __func__ , self->line, |
1005 | (status & IRCOMM_CD) ? "on" : "off"); | |
1da177e4 LT |
1006 | |
1007 | if (status & IRCOMM_CD) { | |
a3cc9fcf | 1008 | wake_up_interruptible(&self->port.open_wait); |
1da177e4 | 1009 | } else { |
955a9d20 | 1010 | pr_debug("%s(), Doing serial hangup..\n", __func__); |
1da177e4 LT |
1011 | if (tty) |
1012 | tty_hangup(tty); | |
1013 | ||
1014 | /* Hangup will remote the tty, so better break out */ | |
62f228ac | 1015 | goto put; |
1da177e4 LT |
1016 | } |
1017 | } | |
f21ec3d2 | 1018 | if (tty && tty_port_cts_enabled(&self->port)) { |
1da177e4 LT |
1019 | if (tty->hw_stopped) { |
1020 | if (status & IRCOMM_CTS) { | |
955a9d20 | 1021 | pr_debug("%s(), CTS tx start...\n", __func__); |
1da177e4 | 1022 | tty->hw_stopped = 0; |
6819bc2e | 1023 | |
1da177e4 | 1024 | /* Wake up processes blocked on open */ |
a3cc9fcf | 1025 | wake_up_interruptible(&self->port.open_wait); |
1da177e4 LT |
1026 | |
1027 | schedule_work(&self->tqueue); | |
62f228ac | 1028 | goto put; |
1da177e4 LT |
1029 | } |
1030 | } else { | |
1031 | if (!(status & IRCOMM_CTS)) { | |
955a9d20 | 1032 | pr_debug("%s(), CTS tx stop...\n", __func__); |
1da177e4 LT |
1033 | tty->hw_stopped = 1; |
1034 | } | |
1035 | } | |
1036 | } | |
62f228ac JS |
1037 | put: |
1038 | tty_kref_put(tty); | |
1da177e4 LT |
1039 | } |
1040 | ||
1041 | /* | |
1042 | * Function ircomm_tty_data_indication (instance, sap, skb) | |
1043 | * | |
1044 | * Handle incoming data, and deliver it to the line discipline | |
1045 | * | |
1046 | */ | |
1047 | static int ircomm_tty_data_indication(void *instance, void *sap, | |
1048 | struct sk_buff *skb) | |
1049 | { | |
1050 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; | |
62f228ac | 1051 | struct tty_struct *tty; |
1da177e4 | 1052 | |
1da177e4 LT |
1053 | IRDA_ASSERT(self != NULL, return -1;); |
1054 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
1055 | IRDA_ASSERT(skb != NULL, return -1;); | |
1056 | ||
62f228ac JS |
1057 | tty = tty_port_tty_get(&self->port); |
1058 | if (!tty) { | |
955a9d20 | 1059 | pr_debug("%s(), no tty!\n", __func__); |
1da177e4 LT |
1060 | return 0; |
1061 | } | |
1062 | ||
6819bc2e | 1063 | /* |
1da177e4 LT |
1064 | * If we receive data when hardware is stopped then something is wrong. |
1065 | * We try to poll the peers line settings to check if we are up todate. | |
6819bc2e | 1066 | * Devices like WinCE can do this, and since they don't send any |
1da177e4 LT |
1067 | * params, we can just as well declare the hardware for running. |
1068 | */ | |
62f228ac | 1069 | if (tty->hw_stopped && (self->flow == FLOW_START)) { |
955a9d20 | 1070 | pr_debug("%s(), polling for line settings!\n", __func__); |
1da177e4 LT |
1071 | ircomm_param_request(self, IRCOMM_POLL, TRUE); |
1072 | ||
1073 | /* We can just as well declare the hardware for running */ | |
1074 | ircomm_tty_send_initial_parameters(self); | |
1075 | ircomm_tty_link_established(self); | |
1076 | } | |
2e124b4a | 1077 | tty_kref_put(tty); |
1da177e4 | 1078 | |
6819bc2e | 1079 | /* |
cbfd1526 AV |
1080 | * Use flip buffer functions since the code may be called from interrupt |
1081 | * context | |
1da177e4 | 1082 | */ |
05c7cd39 | 1083 | tty_insert_flip_string(&self->port, skb->data, skb->len); |
2e124b4a | 1084 | tty_flip_buffer_push(&self->port); |
1da177e4 LT |
1085 | |
1086 | /* No need to kfree_skb - see ircomm_ttp_data_indication() */ | |
1087 | ||
1088 | return 0; | |
1089 | } | |
1090 | ||
1091 | /* | |
1092 | * Function ircomm_tty_control_indication (instance, sap, skb) | |
1093 | * | |
1094 | * Parse all incoming parameters (easy!) | |
1095 | * | |
1096 | */ | |
1097 | static int ircomm_tty_control_indication(void *instance, void *sap, | |
1098 | struct sk_buff *skb) | |
1099 | { | |
1100 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; | |
1101 | int clen; | |
1102 | ||
1da177e4 LT |
1103 | IRDA_ASSERT(self != NULL, return -1;); |
1104 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
1105 | IRDA_ASSERT(skb != NULL, return -1;); | |
1106 | ||
1107 | clen = skb->data[0]; | |
1108 | ||
6819bc2e | 1109 | irda_param_extract_all(self, skb->data+1, IRDA_MIN(skb->len-1, clen), |
1da177e4 LT |
1110 | &ircomm_param_info); |
1111 | ||
1112 | /* No need to kfree_skb - see ircomm_control_indication() */ | |
1113 | ||
1114 | return 0; | |
1115 | } | |
1116 | ||
1117 | /* | |
1118 | * Function ircomm_tty_flow_indication (instance, sap, cmd) | |
1119 | * | |
1120 | * This function is called by IrTTP when it wants us to slow down the | |
1121 | * transmission of data. We just mark the hardware as stopped, and wait | |
1122 | * for IrTTP to notify us that things are OK again. | |
1123 | */ | |
6819bc2e | 1124 | static void ircomm_tty_flow_indication(void *instance, void *sap, |
1da177e4 LT |
1125 | LOCAL_FLOW cmd) |
1126 | { | |
1127 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; | |
1128 | struct tty_struct *tty; | |
1129 | ||
1130 | IRDA_ASSERT(self != NULL, return;); | |
1131 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
1132 | ||
62f228ac | 1133 | tty = tty_port_tty_get(&self->port); |
1da177e4 LT |
1134 | |
1135 | switch (cmd) { | |
1136 | case FLOW_START: | |
955a9d20 | 1137 | pr_debug("%s(), hw start!\n", __func__); |
62f228ac JS |
1138 | if (tty) |
1139 | tty->hw_stopped = 0; | |
1da177e4 LT |
1140 | |
1141 | /* ircomm_tty_do_softint will take care of the rest */ | |
1142 | schedule_work(&self->tqueue); | |
1143 | break; | |
1144 | default: /* If we get here, something is very wrong, better stop */ | |
1145 | case FLOW_STOP: | |
955a9d20 | 1146 | pr_debug("%s(), hw stopped!\n", __func__); |
62f228ac JS |
1147 | if (tty) |
1148 | tty->hw_stopped = 1; | |
1da177e4 LT |
1149 | break; |
1150 | } | |
62f228ac JS |
1151 | |
1152 | tty_kref_put(tty); | |
1da177e4 LT |
1153 | self->flow = cmd; |
1154 | } | |
1155 | ||
92b05e13 | 1156 | #ifdef CONFIG_PROC_FS |
3d304176 | 1157 | static void ircomm_tty_line_info(struct ircomm_tty_cb *self, struct seq_file *m) |
1da177e4 | 1158 | { |
62f228ac | 1159 | struct tty_struct *tty; |
3d304176 | 1160 | char sep; |
1da177e4 | 1161 | |
3d304176 | 1162 | seq_printf(m, "State: %s\n", ircomm_tty_state[self->state]); |
1da177e4 | 1163 | |
3d304176 | 1164 | seq_puts(m, "Service type: "); |
1da177e4 | 1165 | if (self->service_type & IRCOMM_9_WIRE) |
3d304176 | 1166 | seq_puts(m, "9_WIRE"); |
1da177e4 | 1167 | else if (self->service_type & IRCOMM_3_WIRE) |
3d304176 | 1168 | seq_puts(m, "3_WIRE"); |
1da177e4 | 1169 | else if (self->service_type & IRCOMM_3_WIRE_RAW) |
3d304176 | 1170 | seq_puts(m, "3_WIRE_RAW"); |
1da177e4 | 1171 | else |
3d304176 AD |
1172 | seq_puts(m, "No common service type!\n"); |
1173 | seq_putc(m, '\n'); | |
1174 | ||
1175 | seq_printf(m, "Port name: %s\n", self->settings.port_name); | |
1176 | ||
1177 | seq_printf(m, "DTE status:"); | |
1178 | sep = ' '; | |
1179 | if (self->settings.dte & IRCOMM_RTS) { | |
1180 | seq_printf(m, "%cRTS", sep); | |
1181 | sep = '|'; | |
1182 | } | |
1183 | if (self->settings.dte & IRCOMM_DTR) { | |
1184 | seq_printf(m, "%cDTR", sep); | |
1185 | sep = '|'; | |
1186 | } | |
1187 | seq_putc(m, '\n'); | |
1188 | ||
1189 | seq_puts(m, "DCE status:"); | |
1190 | sep = ' '; | |
1191 | if (self->settings.dce & IRCOMM_CTS) { | |
1192 | seq_printf(m, "%cCTS", sep); | |
1193 | sep = '|'; | |
1194 | } | |
1195 | if (self->settings.dce & IRCOMM_DSR) { | |
1196 | seq_printf(m, "%cDSR", sep); | |
1197 | sep = '|'; | |
1198 | } | |
1199 | if (self->settings.dce & IRCOMM_CD) { | |
1200 | seq_printf(m, "%cCD", sep); | |
1201 | sep = '|'; | |
1202 | } | |
1203 | if (self->settings.dce & IRCOMM_RI) { | |
1204 | seq_printf(m, "%cRI", sep); | |
1205 | sep = '|'; | |
1206 | } | |
1207 | seq_putc(m, '\n'); | |
1208 | ||
1209 | seq_puts(m, "Configuration: "); | |
1da177e4 | 1210 | if (!self->settings.null_modem) |
3d304176 | 1211 | seq_puts(m, "DTE <-> DCE\n"); |
1da177e4 | 1212 | else |
3d304176 AD |
1213 | seq_puts(m, "DTE <-> DTE (null modem emulation)\n"); |
1214 | ||
1215 | seq_printf(m, "Data rate: %d\n", self->settings.data_rate); | |
1216 | ||
1217 | seq_puts(m, "Flow control:"); | |
1218 | sep = ' '; | |
1219 | if (self->settings.flow_control & IRCOMM_XON_XOFF_IN) { | |
1220 | seq_printf(m, "%cXON_XOFF_IN", sep); | |
1221 | sep = '|'; | |
1222 | } | |
1223 | if (self->settings.flow_control & IRCOMM_XON_XOFF_OUT) { | |
1224 | seq_printf(m, "%cXON_XOFF_OUT", sep); | |
1225 | sep = '|'; | |
1226 | } | |
1227 | if (self->settings.flow_control & IRCOMM_RTS_CTS_IN) { | |
1228 | seq_printf(m, "%cRTS_CTS_IN", sep); | |
1229 | sep = '|'; | |
1230 | } | |
1231 | if (self->settings.flow_control & IRCOMM_RTS_CTS_OUT) { | |
1232 | seq_printf(m, "%cRTS_CTS_OUT", sep); | |
1233 | sep = '|'; | |
1234 | } | |
1235 | if (self->settings.flow_control & IRCOMM_DSR_DTR_IN) { | |
1236 | seq_printf(m, "%cDSR_DTR_IN", sep); | |
1237 | sep = '|'; | |
1238 | } | |
1239 | if (self->settings.flow_control & IRCOMM_DSR_DTR_OUT) { | |
1240 | seq_printf(m, "%cDSR_DTR_OUT", sep); | |
1241 | sep = '|'; | |
1242 | } | |
1243 | if (self->settings.flow_control & IRCOMM_ENQ_ACK_IN) { | |
1244 | seq_printf(m, "%cENQ_ACK_IN", sep); | |
1245 | sep = '|'; | |
1246 | } | |
1247 | if (self->settings.flow_control & IRCOMM_ENQ_ACK_OUT) { | |
1248 | seq_printf(m, "%cENQ_ACK_OUT", sep); | |
1249 | sep = '|'; | |
1250 | } | |
1251 | seq_putc(m, '\n'); | |
1252 | ||
1253 | seq_puts(m, "Flags:"); | |
1254 | sep = ' '; | |
f21ec3d2 | 1255 | if (tty_port_cts_enabled(&self->port)) { |
3d304176 AD |
1256 | seq_printf(m, "%cASYNC_CTS_FLOW", sep); |
1257 | sep = '|'; | |
1258 | } | |
2d68655d | 1259 | if (tty_port_check_carrier(&self->port)) { |
3d304176 AD |
1260 | seq_printf(m, "%cASYNC_CHECK_CD", sep); |
1261 | sep = '|'; | |
1262 | } | |
d41861ca | 1263 | if (tty_port_initialized(&self->port)) { |
3d304176 AD |
1264 | seq_printf(m, "%cASYNC_INITIALIZED", sep); |
1265 | sep = '|'; | |
1266 | } | |
849d5a99 | 1267 | if (self->port.flags & ASYNC_LOW_LATENCY) { |
3d304176 AD |
1268 | seq_printf(m, "%cASYNC_LOW_LATENCY", sep); |
1269 | sep = '|'; | |
1270 | } | |
807c8d81 | 1271 | if (tty_port_active(&self->port)) { |
3d304176 AD |
1272 | seq_printf(m, "%cASYNC_NORMAL_ACTIVE", sep); |
1273 | sep = '|'; | |
1274 | } | |
1275 | seq_putc(m, '\n'); | |
1276 | ||
1277 | seq_printf(m, "Role: %s\n", self->client ? "client" : "server"); | |
580d27b4 | 1278 | seq_printf(m, "Open count: %d\n", self->port.count); |
3d304176 AD |
1279 | seq_printf(m, "Max data size: %d\n", self->max_data_size); |
1280 | seq_printf(m, "Max header size: %d\n", self->max_header_size); | |
6819bc2e | 1281 | |
62f228ac JS |
1282 | tty = tty_port_tty_get(&self->port); |
1283 | if (tty) { | |
3d304176 | 1284 | seq_printf(m, "Hardware: %s\n", |
62f228ac JS |
1285 | tty->hw_stopped ? "Stopped" : "Running"); |
1286 | tty_kref_put(tty); | |
1287 | } | |
1da177e4 LT |
1288 | } |
1289 | ||
3d304176 | 1290 | static int ircomm_tty_proc_show(struct seq_file *m, void *v) |
1da177e4 LT |
1291 | { |
1292 | struct ircomm_tty_cb *self; | |
1da177e4 LT |
1293 | unsigned long flags; |
1294 | ||
1295 | spin_lock_irqsave(&ircomm_tty->hb_spinlock, flags); | |
1296 | ||
1297 | self = (struct ircomm_tty_cb *) hashbin_get_first(ircomm_tty); | |
3d304176 | 1298 | while (self != NULL) { |
1da177e4 LT |
1299 | if (self->magic != IRCOMM_TTY_MAGIC) |
1300 | break; | |
1301 | ||
3d304176 | 1302 | ircomm_tty_line_info(self, m); |
1da177e4 | 1303 | self = (struct ircomm_tty_cb *) hashbin_get_next(ircomm_tty); |
6819bc2e | 1304 | } |
1da177e4 | 1305 | spin_unlock_irqrestore(&ircomm_tty->hb_spinlock, flags); |
3d304176 AD |
1306 | return 0; |
1307 | } | |
1da177e4 | 1308 | |
3d304176 AD |
1309 | static int ircomm_tty_proc_open(struct inode *inode, struct file *file) |
1310 | { | |
1311 | return single_open(file, ircomm_tty_proc_show, NULL); | |
1da177e4 | 1312 | } |
3d304176 AD |
1313 | |
1314 | static const struct file_operations ircomm_tty_proc_fops = { | |
1315 | .owner = THIS_MODULE, | |
1316 | .open = ircomm_tty_proc_open, | |
1317 | .read = seq_read, | |
1318 | .llseek = seq_lseek, | |
1319 | .release = single_release, | |
1320 | }; | |
1da177e4 LT |
1321 | #endif /* CONFIG_PROC_FS */ |
1322 | ||
1323 | MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>"); | |
1324 | MODULE_DESCRIPTION("IrCOMM serial TTY driver"); | |
1325 | MODULE_LICENSE("GPL"); | |
1326 | MODULE_ALIAS_CHARDEV_MAJOR(IRCOMM_TTY_MAJOR); | |
1327 | ||
1328 | module_init(ircomm_tty_init); | |
1329 | module_exit(ircomm_tty_cleanup); |