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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 | |
27 | * along with this program; if not, write to the Free Software | |
28 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
1da177e4 | 29 | * MA 02111-1307 USA |
6819bc2e | 30 | * |
1da177e4 LT |
31 | ********************************************************************/ |
32 | ||
1da177e4 LT |
33 | #include <linux/init.h> |
34 | #include <linux/module.h> | |
35 | #include <linux/fs.h> | |
5a0e3ad6 | 36 | #include <linux/slab.h> |
1da177e4 | 37 | #include <linux/sched.h> |
3d304176 | 38 | #include <linux/seq_file.h> |
1da177e4 LT |
39 | #include <linux/termios.h> |
40 | #include <linux/tty.h> | |
cbfd1526 | 41 | #include <linux/tty_flip.h> |
1da177e4 LT |
42 | #include <linux/interrupt.h> |
43 | #include <linux/device.h> /* for MODULE_ALIAS_CHARDEV_MAJOR */ | |
44 | ||
45 | #include <asm/uaccess.h> | |
46 | ||
47 | #include <net/irda/irda.h> | |
48 | #include <net/irda/irmod.h> | |
49 | ||
50 | #include <net/irda/ircomm_core.h> | |
51 | #include <net/irda/ircomm_param.h> | |
52 | #include <net/irda/ircomm_tty_attach.h> | |
53 | #include <net/irda/ircomm_tty.h> | |
54 | ||
9c650ffc JS |
55 | static int ircomm_tty_install(struct tty_driver *driver, |
56 | struct tty_struct *tty); | |
1da177e4 LT |
57 | static int ircomm_tty_open(struct tty_struct *tty, struct file *filp); |
58 | static void ircomm_tty_close(struct tty_struct * tty, struct file *filp); | |
59 | static int ircomm_tty_write(struct tty_struct * tty, | |
60 | const unsigned char *buf, int count); | |
61 | static int ircomm_tty_write_room(struct tty_struct *tty); | |
62 | static void ircomm_tty_throttle(struct tty_struct *tty); | |
63 | static void ircomm_tty_unthrottle(struct tty_struct *tty); | |
64 | static int ircomm_tty_chars_in_buffer(struct tty_struct *tty); | |
65 | static void ircomm_tty_flush_buffer(struct tty_struct *tty); | |
66 | static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch); | |
67 | static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout); | |
68 | static void ircomm_tty_hangup(struct tty_struct *tty); | |
c4028958 | 69 | static void ircomm_tty_do_softint(struct work_struct *work); |
1da177e4 LT |
70 | static void ircomm_tty_shutdown(struct ircomm_tty_cb *self); |
71 | static void ircomm_tty_stop(struct tty_struct *tty); | |
72 | ||
73 | static int ircomm_tty_data_indication(void *instance, void *sap, | |
74 | struct sk_buff *skb); | |
75 | static int ircomm_tty_control_indication(void *instance, void *sap, | |
76 | struct sk_buff *skb); | |
6819bc2e | 77 | static void ircomm_tty_flow_indication(void *instance, void *sap, |
1da177e4 LT |
78 | LOCAL_FLOW cmd); |
79 | #ifdef CONFIG_PROC_FS | |
3d304176 | 80 | static const struct file_operations ircomm_tty_proc_fops; |
1da177e4 LT |
81 | #endif /* CONFIG_PROC_FS */ |
82 | static struct tty_driver *driver; | |
83 | ||
d76081f8 | 84 | static hashbin_t *ircomm_tty = NULL; |
1da177e4 | 85 | |
b68e31d0 | 86 | static const struct tty_operations ops = { |
9c650ffc | 87 | .install = ircomm_tty_install, |
1da177e4 LT |
88 | .open = ircomm_tty_open, |
89 | .close = ircomm_tty_close, | |
90 | .write = ircomm_tty_write, | |
91 | .write_room = ircomm_tty_write_room, | |
92 | .chars_in_buffer = ircomm_tty_chars_in_buffer, | |
93 | .flush_buffer = ircomm_tty_flush_buffer, | |
94 | .ioctl = ircomm_tty_ioctl, /* ircomm_tty_ioctl.c */ | |
95 | .tiocmget = ircomm_tty_tiocmget, /* ircomm_tty_ioctl.c */ | |
96 | .tiocmset = ircomm_tty_tiocmset, /* ircomm_tty_ioctl.c */ | |
97 | .throttle = ircomm_tty_throttle, | |
98 | .unthrottle = ircomm_tty_unthrottle, | |
99 | .send_xchar = ircomm_tty_send_xchar, | |
100 | .set_termios = ircomm_tty_set_termios, | |
101 | .stop = ircomm_tty_stop, | |
102 | .start = ircomm_tty_start, | |
103 | .hangup = ircomm_tty_hangup, | |
104 | .wait_until_sent = ircomm_tty_wait_until_sent, | |
105 | #ifdef CONFIG_PROC_FS | |
3d304176 | 106 | .proc_fops = &ircomm_tty_proc_fops, |
1da177e4 LT |
107 | #endif /* CONFIG_PROC_FS */ |
108 | }; | |
109 | ||
0ba9ff84 JS |
110 | static void ircomm_port_raise_dtr_rts(struct tty_port *port, int raise) |
111 | { | |
112 | struct ircomm_tty_cb *self = container_of(port, struct ircomm_tty_cb, | |
113 | port); | |
114 | /* | |
115 | * Here, we use to lock those two guys, but as ircomm_param_request() | |
116 | * does it itself, I don't see the point (and I see the deadlock). | |
117 | * Jean II | |
118 | */ | |
119 | if (raise) | |
120 | self->settings.dte |= IRCOMM_RTS | IRCOMM_DTR; | |
121 | else | |
122 | self->settings.dte &= ~(IRCOMM_RTS | IRCOMM_DTR); | |
123 | ||
124 | ircomm_param_request(self, IRCOMM_DTE, TRUE); | |
125 | } | |
126 | ||
127 | static int ircomm_port_carrier_raised(struct tty_port *port) | |
128 | { | |
129 | struct ircomm_tty_cb *self = container_of(port, struct ircomm_tty_cb, | |
130 | port); | |
131 | return self->settings.dce & IRCOMM_CD; | |
132 | } | |
133 | ||
134 | static const struct tty_port_operations ircomm_port_ops = { | |
135 | .dtr_rts = ircomm_port_raise_dtr_rts, | |
136 | .carrier_raised = ircomm_port_carrier_raised, | |
137 | }; | |
138 | ||
1da177e4 LT |
139 | /* |
140 | * Function ircomm_tty_init() | |
141 | * | |
142 | * Init IrCOMM TTY layer/driver | |
143 | * | |
144 | */ | |
145 | static int __init ircomm_tty_init(void) | |
146 | { | |
147 | driver = alloc_tty_driver(IRCOMM_TTY_PORTS); | |
148 | if (!driver) | |
149 | return -ENOMEM; | |
6819bc2e | 150 | ircomm_tty = hashbin_new(HB_LOCK); |
1da177e4 | 151 | if (ircomm_tty == NULL) { |
0dc47877 | 152 | IRDA_ERROR("%s(), can't allocate hashbin!\n", __func__); |
1da177e4 LT |
153 | put_tty_driver(driver); |
154 | return -ENOMEM; | |
155 | } | |
156 | ||
1da177e4 LT |
157 | driver->driver_name = "ircomm"; |
158 | driver->name = "ircomm"; | |
1da177e4 LT |
159 | driver->major = IRCOMM_TTY_MAJOR; |
160 | driver->minor_start = IRCOMM_TTY_MINOR; | |
161 | driver->type = TTY_DRIVER_TYPE_SERIAL; | |
162 | driver->subtype = SERIAL_TYPE_NORMAL; | |
163 | driver->init_termios = tty_std_termios; | |
164 | driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; | |
165 | driver->flags = TTY_DRIVER_REAL_RAW; | |
166 | tty_set_operations(driver, &ops); | |
167 | if (tty_register_driver(driver)) { | |
168 | IRDA_ERROR("%s(): Couldn't register serial driver\n", | |
0dc47877 | 169 | __func__); |
1da177e4 LT |
170 | put_tty_driver(driver); |
171 | return -1; | |
172 | } | |
173 | return 0; | |
174 | } | |
175 | ||
176 | static void __exit __ircomm_tty_cleanup(struct ircomm_tty_cb *self) | |
177 | { | |
0dc47877 | 178 | IRDA_DEBUG(0, "%s()\n", __func__ ); |
1da177e4 LT |
179 | |
180 | IRDA_ASSERT(self != NULL, return;); | |
181 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
182 | ||
183 | ircomm_tty_shutdown(self); | |
184 | ||
185 | self->magic = 0; | |
191c5f10 | 186 | tty_port_destroy(&self->port); |
1da177e4 LT |
187 | kfree(self); |
188 | } | |
189 | ||
190 | /* | |
191 | * Function ircomm_tty_cleanup () | |
192 | * | |
193 | * Remove IrCOMM TTY layer/driver | |
194 | * | |
195 | */ | |
196 | static void __exit ircomm_tty_cleanup(void) | |
197 | { | |
198 | int ret; | |
199 | ||
0dc47877 | 200 | IRDA_DEBUG(4, "%s()\n", __func__ ); |
1da177e4 LT |
201 | |
202 | ret = tty_unregister_driver(driver); | |
6819bc2e YH |
203 | if (ret) { |
204 | IRDA_ERROR("%s(), failed to unregister driver\n", | |
0dc47877 | 205 | __func__); |
1da177e4 LT |
206 | return; |
207 | } | |
208 | ||
209 | hashbin_delete(ircomm_tty, (FREE_FUNC) __ircomm_tty_cleanup); | |
210 | put_tty_driver(driver); | |
211 | } | |
212 | ||
213 | /* | |
214 | * Function ircomm_startup (self) | |
215 | * | |
6819bc2e | 216 | * |
1da177e4 LT |
217 | * |
218 | */ | |
219 | static int ircomm_tty_startup(struct ircomm_tty_cb *self) | |
220 | { | |
221 | notify_t notify; | |
222 | int ret = -ENODEV; | |
223 | ||
0dc47877 | 224 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 LT |
225 | |
226 | IRDA_ASSERT(self != NULL, return -1;); | |
227 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
228 | ||
229 | /* Check if already open */ | |
849d5a99 | 230 | if (test_and_set_bit(ASYNCB_INITIALIZED, &self->port.flags)) { |
0dc47877 | 231 | IRDA_DEBUG(2, "%s(), already open so break out!\n", __func__ ); |
1da177e4 LT |
232 | return 0; |
233 | } | |
234 | ||
235 | /* Register with IrCOMM */ | |
236 | irda_notify_init(¬ify); | |
237 | /* These callbacks we must handle ourselves */ | |
238 | notify.data_indication = ircomm_tty_data_indication; | |
239 | notify.udata_indication = ircomm_tty_control_indication; | |
6819bc2e | 240 | notify.flow_indication = ircomm_tty_flow_indication; |
1da177e4 LT |
241 | |
242 | /* Use the ircomm_tty interface for these ones */ | |
6819bc2e | 243 | notify.disconnect_indication = ircomm_tty_disconnect_indication; |
1da177e4 | 244 | notify.connect_confirm = ircomm_tty_connect_confirm; |
6819bc2e | 245 | notify.connect_indication = ircomm_tty_connect_indication; |
1da177e4 LT |
246 | strlcpy(notify.name, "ircomm_tty", sizeof(notify.name)); |
247 | notify.instance = self; | |
248 | ||
249 | if (!self->ircomm) { | |
6819bc2e | 250 | self->ircomm = ircomm_open(¬ify, self->service_type, |
1da177e4 LT |
251 | self->line); |
252 | } | |
253 | if (!self->ircomm) | |
254 | goto err; | |
255 | ||
256 | self->slsap_sel = self->ircomm->slsap_sel; | |
257 | ||
258 | /* Connect IrCOMM link with remote device */ | |
259 | ret = ircomm_tty_attach_cable(self); | |
260 | if (ret < 0) { | |
0dc47877 | 261 | IRDA_ERROR("%s(), error attaching cable!\n", __func__); |
1da177e4 LT |
262 | goto err; |
263 | } | |
264 | ||
265 | return 0; | |
266 | err: | |
849d5a99 | 267 | clear_bit(ASYNCB_INITIALIZED, &self->port.flags); |
1da177e4 LT |
268 | return ret; |
269 | } | |
270 | ||
271 | /* | |
272 | * Function ircomm_block_til_ready (self, filp) | |
273 | * | |
6819bc2e | 274 | * |
1da177e4 LT |
275 | * |
276 | */ | |
6819bc2e | 277 | static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self, |
62f228ac | 278 | struct tty_struct *tty, struct file *filp) |
1da177e4 | 279 | { |
38c58032 | 280 | struct tty_port *port = &self->port; |
1da177e4 LT |
281 | DECLARE_WAITQUEUE(wait, current); |
282 | int retval; | |
a4ed2e73 | 283 | int do_clocal = 0; |
1da177e4 | 284 | unsigned long flags; |
6819bc2e | 285 | |
0dc47877 | 286 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 | 287 | |
1da177e4 LT |
288 | /* |
289 | * If non-blocking mode is set, or the port is not enabled, | |
290 | * then make the check up front and then exit. | |
6819bc2e | 291 | */ |
f74861ca PH |
292 | if (test_bit(TTY_IO_ERROR, &tty->flags)) { |
293 | port->flags |= ASYNC_NORMAL_ACTIVE; | |
294 | return 0; | |
295 | } | |
296 | ||
297 | if (filp->f_flags & O_NONBLOCK) { | |
298 | /* nonblock mode is set */ | |
299 | if (tty->termios.c_cflag & CBAUD) | |
300 | tty_port_raise_dtr_rts(port); | |
38c58032 | 301 | port->flags |= ASYNC_NORMAL_ACTIVE; |
0dc47877 | 302 | IRDA_DEBUG(1, "%s(), O_NONBLOCK requested!\n", __func__ ); |
1da177e4 LT |
303 | return 0; |
304 | } | |
305 | ||
adc8d746 | 306 | if (tty->termios.c_cflag & CLOCAL) { |
0dc47877 | 307 | IRDA_DEBUG(1, "%s(), doing CLOCAL!\n", __func__ ); |
1da177e4 LT |
308 | do_clocal = 1; |
309 | } | |
6819bc2e | 310 | |
1da177e4 LT |
311 | /* Wait for carrier detect and the line to become |
312 | * free (i.e., not in use by the callout). While we are in | |
38c58032 | 313 | * this loop, port->count is dropped by one, so that |
1da177e4 LT |
314 | * mgsl_close() knows when to free things. We restore it upon |
315 | * exit, either normal or abnormal. | |
316 | */ | |
6819bc2e | 317 | |
1da177e4 | 318 | retval = 0; |
38c58032 | 319 | add_wait_queue(&port->open_wait, &wait); |
6819bc2e | 320 | |
1da177e4 | 321 | IRDA_DEBUG(2, "%s(%d):block_til_ready before block on %s open_count=%d\n", |
38c58032 | 322 | __FILE__, __LINE__, tty->driver->name, port->count); |
1da177e4 | 323 | |
38c58032 | 324 | spin_lock_irqsave(&port->lock, flags); |
a4ed2e73 | 325 | if (!tty_hung_up_p(filp)) |
38c58032 | 326 | port->count--; |
38c58032 | 327 | port->blocked_open++; |
2f7c069b | 328 | spin_unlock_irqrestore(&port->lock, flags); |
6819bc2e | 329 | |
1da177e4 | 330 | while (1) { |
adc8d746 | 331 | if (tty->termios.c_cflag & CBAUD) |
0ba9ff84 | 332 | tty_port_raise_dtr_rts(port); |
6819bc2e | 333 | |
0b176ce3 | 334 | set_current_state(TASK_INTERRUPTIBLE); |
6819bc2e | 335 | |
1da177e4 | 336 | if (tty_hung_up_p(filp) || |
38c58032 JS |
337 | !test_bit(ASYNCB_INITIALIZED, &port->flags)) { |
338 | retval = (port->flags & ASYNC_HUP_NOTIFY) ? | |
1da177e4 LT |
339 | -EAGAIN : -ERESTARTSYS; |
340 | break; | |
341 | } | |
6819bc2e YH |
342 | |
343 | /* | |
1da177e4 LT |
344 | * Check if link is ready now. Even if CLOCAL is |
345 | * specified, we cannot return before the IrCOMM link is | |
6819bc2e | 346 | * ready |
1da177e4 | 347 | */ |
38c58032 | 348 | if (!test_bit(ASYNCB_CLOSING, &port->flags) && |
0ba9ff84 | 349 | (do_clocal || tty_port_carrier_raised(port)) && |
1da177e4 LT |
350 | self->state == IRCOMM_TTY_READY) |
351 | { | |
6819bc2e | 352 | break; |
1da177e4 | 353 | } |
6819bc2e | 354 | |
1da177e4 LT |
355 | if (signal_pending(current)) { |
356 | retval = -ERESTARTSYS; | |
357 | break; | |
358 | } | |
6819bc2e | 359 | |
1da177e4 | 360 | IRDA_DEBUG(1, "%s(%d):block_til_ready blocking on %s open_count=%d\n", |
38c58032 | 361 | __FILE__, __LINE__, tty->driver->name, port->count); |
6819bc2e | 362 | |
1da177e4 LT |
363 | schedule(); |
364 | } | |
6819bc2e | 365 | |
1da177e4 | 366 | __set_current_state(TASK_RUNNING); |
38c58032 | 367 | remove_wait_queue(&port->open_wait, &wait); |
6819bc2e | 368 | |
a4ed2e73 PH |
369 | spin_lock_irqsave(&port->lock, flags); |
370 | if (!tty_hung_up_p(filp)) | |
38c58032 | 371 | port->count++; |
38c58032 | 372 | port->blocked_open--; |
2f7c069b | 373 | spin_unlock_irqrestore(&port->lock, flags); |
6819bc2e | 374 | |
1da177e4 | 375 | IRDA_DEBUG(1, "%s(%d):block_til_ready after blocking on %s open_count=%d\n", |
38c58032 | 376 | __FILE__, __LINE__, tty->driver->name, port->count); |
6819bc2e | 377 | |
1da177e4 | 378 | if (!retval) |
38c58032 | 379 | port->flags |= ASYNC_NORMAL_ACTIVE; |
6819bc2e YH |
380 | |
381 | return retval; | |
1da177e4 LT |
382 | } |
383 | ||
9c650ffc JS |
384 | |
385 | static int ircomm_tty_install(struct tty_driver *driver, struct tty_struct *tty) | |
1da177e4 LT |
386 | { |
387 | struct ircomm_tty_cb *self; | |
410235fd | 388 | unsigned int line = tty->index; |
1da177e4 | 389 | |
1da177e4 LT |
390 | /* Check if instance already exists */ |
391 | self = hashbin_lock_find(ircomm_tty, line, NULL); | |
392 | if (!self) { | |
393 | /* No, so make new instance */ | |
0da974f4 | 394 | self = kzalloc(sizeof(struct ircomm_tty_cb), GFP_KERNEL); |
1da177e4 | 395 | if (self == NULL) { |
0dc47877 | 396 | IRDA_ERROR("%s(), kmalloc failed!\n", __func__); |
1da177e4 LT |
397 | return -ENOMEM; |
398 | } | |
6819bc2e | 399 | |
a3cc9fcf | 400 | tty_port_init(&self->port); |
0ba9ff84 | 401 | self->port.ops = &ircomm_port_ops; |
1da177e4 LT |
402 | self->magic = IRCOMM_TTY_MAGIC; |
403 | self->flow = FLOW_STOP; | |
404 | ||
405 | self->line = line; | |
c4028958 | 406 | INIT_WORK(&self->tqueue, ircomm_tty_do_softint); |
1da177e4 LT |
407 | self->max_header_size = IRCOMM_TTY_HDR_UNINITIALISED; |
408 | self->max_data_size = IRCOMM_TTY_DATA_UNINITIALISED; | |
1da177e4 LT |
409 | |
410 | /* Init some important stuff */ | |
411 | init_timer(&self->watchdog_timer); | |
1da177e4 LT |
412 | spin_lock_init(&self->spinlock); |
413 | ||
6819bc2e | 414 | /* |
1da177e4 LT |
415 | * Force TTY into raw mode by default which is usually what |
416 | * we want for IrCOMM and IrLPT. This way applications will | |
6819bc2e | 417 | * not have to twiddle with printcap etc. |
ad36b88e AC |
418 | * |
419 | * Note this is completely usafe and doesn't work properly | |
1da177e4 | 420 | */ |
adc8d746 AC |
421 | tty->termios.c_iflag = 0; |
422 | tty->termios.c_oflag = 0; | |
1da177e4 LT |
423 | |
424 | /* Insert into hash */ | |
425 | hashbin_insert(ircomm_tty, (irda_queue_t *) self, line, NULL); | |
426 | } | |
9c650ffc | 427 | |
6f560125 SL |
428 | tty->driver_data = self; |
429 | ||
9c650ffc JS |
430 | return tty_port_install(&self->port, driver, tty); |
431 | } | |
432 | ||
433 | /* | |
434 | * Function ircomm_tty_open (tty, filp) | |
435 | * | |
436 | * This routine is called when a particular tty device is opened. This | |
437 | * routine is mandatory; if this routine is not filled in, the attempted | |
438 | * open will fail with ENODEV. | |
439 | */ | |
440 | static int ircomm_tty_open(struct tty_struct *tty, struct file *filp) | |
441 | { | |
442 | struct ircomm_tty_cb *self = tty->driver_data; | |
443 | unsigned long flags; | |
444 | int ret; | |
445 | ||
446 | IRDA_DEBUG(2, "%s()\n", __func__ ); | |
447 | ||
1da177e4 | 448 | /* ++ is not atomic, so this should be protected - Jean II */ |
e673927d | 449 | spin_lock_irqsave(&self->port.lock, flags); |
580d27b4 | 450 | self->port.count++; |
e673927d | 451 | spin_unlock_irqrestore(&self->port.lock, flags); |
62f228ac | 452 | tty_port_tty_set(&self->port, tty); |
1da177e4 | 453 | |
0dc47877 | 454 | IRDA_DEBUG(1, "%s(), %s%d, count = %d\n", __func__ , tty->driver->name, |
580d27b4 | 455 | self->line, self->port.count); |
1da177e4 LT |
456 | |
457 | /* Not really used by us, but lets do it anyway */ | |
d6c53c0e | 458 | self->port.low_latency = (self->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0; |
1da177e4 LT |
459 | |
460 | /* | |
461 | * If the port is the middle of closing, bail out now | |
462 | */ | |
463 | if (tty_hung_up_p(filp) || | |
849d5a99 | 464 | test_bit(ASYNCB_CLOSING, &self->port.flags)) { |
1da177e4 LT |
465 | |
466 | /* Hm, why are we blocking on ASYNC_CLOSING if we | |
467 | * do return -EAGAIN/-ERESTARTSYS below anyway? | |
468 | * IMHO it's either not needed in the first place | |
469 | * or for some reason we need to make sure the async | |
470 | * closing has been finished - if so, wouldn't we | |
471 | * probably better sleep uninterruptible? | |
472 | */ | |
473 | ||
a3cc9fcf | 474 | if (wait_event_interruptible(self->port.close_wait, |
849d5a99 | 475 | !test_bit(ASYNCB_CLOSING, &self->port.flags))) { |
1da177e4 | 476 | IRDA_WARNING("%s - got signal while blocking on ASYNC_CLOSING!\n", |
0dc47877 | 477 | __func__); |
1da177e4 LT |
478 | return -ERESTARTSYS; |
479 | } | |
480 | ||
481 | #ifdef SERIAL_DO_RESTART | |
849d5a99 | 482 | return (self->port.flags & ASYNC_HUP_NOTIFY) ? |
a02cec21 | 483 | -EAGAIN : -ERESTARTSYS; |
1da177e4 LT |
484 | #else |
485 | return -EAGAIN; | |
486 | #endif | |
487 | } | |
488 | ||
489 | /* Check if this is a "normal" ircomm device, or an irlpt device */ | |
9c650ffc | 490 | if (self->line < 0x10) { |
1da177e4 LT |
491 | self->service_type = IRCOMM_3_WIRE | IRCOMM_9_WIRE; |
492 | self->settings.service_type = IRCOMM_9_WIRE; /* 9 wire as default */ | |
493 | /* Jan Kiszka -> add DSR/RI -> Conform to IrCOMM spec */ | |
494 | self->settings.dce = IRCOMM_CTS | IRCOMM_CD | IRCOMM_DSR | IRCOMM_RI; /* Default line settings */ | |
0dc47877 | 495 | IRDA_DEBUG(2, "%s(), IrCOMM device\n", __func__ ); |
1da177e4 | 496 | } else { |
0dc47877 | 497 | IRDA_DEBUG(2, "%s(), IrLPT device\n", __func__ ); |
1da177e4 LT |
498 | self->service_type = IRCOMM_3_WIRE_RAW; |
499 | self->settings.service_type = IRCOMM_3_WIRE_RAW; /* Default */ | |
500 | } | |
501 | ||
502 | ret = ircomm_tty_startup(self); | |
503 | if (ret) | |
504 | return ret; | |
505 | ||
62f228ac | 506 | ret = ircomm_tty_block_til_ready(self, tty, filp); |
1da177e4 | 507 | if (ret) { |
6819bc2e | 508 | IRDA_DEBUG(2, |
0dc47877 | 509 | "%s(), returning after block_til_ready with %d\n", __func__ , |
1da177e4 LT |
510 | ret); |
511 | ||
512 | return ret; | |
513 | } | |
514 | return 0; | |
515 | } | |
516 | ||
517 | /* | |
518 | * Function ircomm_tty_close (tty, filp) | |
519 | * | |
520 | * This routine is called when a particular tty device is closed. | |
521 | * | |
522 | */ | |
523 | static void ircomm_tty_close(struct tty_struct *tty, struct file *filp) | |
524 | { | |
525 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
38c58032 | 526 | struct tty_port *port = &self->port; |
1da177e4 | 527 | |
0dc47877 | 528 | IRDA_DEBUG(0, "%s()\n", __func__ ); |
1da177e4 | 529 | |
1da177e4 LT |
530 | IRDA_ASSERT(self != NULL, return;); |
531 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
532 | ||
c0e78650 | 533 | if (tty_port_close_start(port, tty, filp) == 0) |
1da177e4 | 534 | return; |
1da177e4 LT |
535 | |
536 | ircomm_tty_shutdown(self); | |
537 | ||
f34d7a5b | 538 | tty_driver_flush_buffer(tty); |
1da177e4 | 539 | |
a1e84403 | 540 | tty_port_close_end(port, tty); |
38c58032 | 541 | tty_port_tty_set(port, NULL); |
1da177e4 LT |
542 | } |
543 | ||
544 | /* | |
545 | * Function ircomm_tty_flush_buffer (tty) | |
546 | * | |
6819bc2e | 547 | * |
1da177e4 LT |
548 | * |
549 | */ | |
550 | static void ircomm_tty_flush_buffer(struct tty_struct *tty) | |
551 | { | |
552 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
553 | ||
554 | IRDA_ASSERT(self != NULL, return;); | |
555 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
556 | ||
6819bc2e YH |
557 | /* |
558 | * Let do_softint() do this to avoid race condition with | |
559 | * do_softint() ;-) | |
1da177e4 LT |
560 | */ |
561 | schedule_work(&self->tqueue); | |
562 | } | |
563 | ||
564 | /* | |
c4028958 | 565 | * Function ircomm_tty_do_softint (work) |
1da177e4 LT |
566 | * |
567 | * We use this routine to give the write wakeup to the user at at a | |
6819bc2e | 568 | * safe time (as fast as possible after write have completed). This |
1da177e4 LT |
569 | * can be compared to the Tx interrupt. |
570 | */ | |
c4028958 | 571 | static void ircomm_tty_do_softint(struct work_struct *work) |
1da177e4 | 572 | { |
c4028958 DH |
573 | struct ircomm_tty_cb *self = |
574 | container_of(work, struct ircomm_tty_cb, tqueue); | |
1da177e4 LT |
575 | struct tty_struct *tty; |
576 | unsigned long flags; | |
577 | struct sk_buff *skb, *ctrl_skb; | |
578 | ||
0dc47877 | 579 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 LT |
580 | |
581 | if (!self || self->magic != IRCOMM_TTY_MAGIC) | |
582 | return; | |
583 | ||
62f228ac | 584 | tty = tty_port_tty_get(&self->port); |
1da177e4 LT |
585 | if (!tty) |
586 | return; | |
587 | ||
588 | /* Unlink control buffer */ | |
589 | spin_lock_irqsave(&self->spinlock, flags); | |
590 | ||
591 | ctrl_skb = self->ctrl_skb; | |
592 | self->ctrl_skb = NULL; | |
593 | ||
594 | spin_unlock_irqrestore(&self->spinlock, flags); | |
595 | ||
596 | /* Flush control buffer if any */ | |
597 | if(ctrl_skb) { | |
598 | if(self->flow == FLOW_START) | |
599 | ircomm_control_request(self->ircomm, ctrl_skb); | |
600 | /* Drop reference count - see ircomm_ttp_data_request(). */ | |
601 | dev_kfree_skb(ctrl_skb); | |
602 | } | |
603 | ||
604 | if (tty->hw_stopped) | |
62f228ac | 605 | goto put; |
1da177e4 LT |
606 | |
607 | /* Unlink transmit buffer */ | |
608 | spin_lock_irqsave(&self->spinlock, flags); | |
6819bc2e | 609 | |
1da177e4 LT |
610 | skb = self->tx_skb; |
611 | self->tx_skb = NULL; | |
612 | ||
613 | spin_unlock_irqrestore(&self->spinlock, flags); | |
614 | ||
615 | /* Flush transmit buffer if any */ | |
616 | if (skb) { | |
617 | ircomm_tty_do_event(self, IRCOMM_TTY_DATA_REQUEST, skb, NULL); | |
618 | /* Drop reference count - see ircomm_ttp_data_request(). */ | |
619 | dev_kfree_skb(skb); | |
620 | } | |
6819bc2e | 621 | |
1da177e4 | 622 | /* Check if user (still) wants to be waken up */ |
a352def2 | 623 | tty_wakeup(tty); |
62f228ac JS |
624 | put: |
625 | tty_kref_put(tty); | |
1da177e4 LT |
626 | } |
627 | ||
628 | /* | |
629 | * Function ircomm_tty_write (tty, buf, count) | |
630 | * | |
631 | * This routine is called by the kernel to write a series of characters | |
632 | * to the tty device. The characters may come from user space or kernel | |
633 | * space. This routine will return the number of characters actually | |
634 | * accepted for writing. This routine is mandatory. | |
635 | */ | |
636 | static int ircomm_tty_write(struct tty_struct *tty, | |
637 | const unsigned char *buf, int count) | |
638 | { | |
639 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
640 | unsigned long flags; | |
641 | struct sk_buff *skb; | |
642 | int tailroom = 0; | |
643 | int len = 0; | |
644 | int size; | |
645 | ||
0dc47877 | 646 | IRDA_DEBUG(2, "%s(), count=%d, hw_stopped=%d\n", __func__ , count, |
1da177e4 LT |
647 | tty->hw_stopped); |
648 | ||
649 | IRDA_ASSERT(self != NULL, return -1;); | |
650 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
651 | ||
652 | /* We may receive packets from the TTY even before we have finished | |
653 | * our setup. Not cool. | |
654 | * The problem is that we don't know the final header and data size | |
655 | * to create the proper skb, so any skb we would create would have | |
656 | * bogus header and data size, so need care. | |
657 | * We use a bogus header size to safely detect this condition. | |
658 | * Another problem is that hw_stopped was set to 0 way before it | |
659 | * should be, so we would drop this skb. It should now be fixed. | |
660 | * One option is to not accept data until we are properly setup. | |
661 | * But, I suspect that when it happens, the ppp line discipline | |
662 | * just "drops" the data, which might screw up connect scripts. | |
663 | * The second option is to create a "safe skb", with large header | |
664 | * and small size (see ircomm_tty_open() for values). | |
665 | * We just need to make sure that when the real values get filled, | |
666 | * we don't mess up the original "safe skb" (see tx_data_size). | |
667 | * Jean II */ | |
668 | if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) { | |
0dc47877 | 669 | IRDA_DEBUG(1, "%s() : not initialised\n", __func__); |
1da177e4 LT |
670 | #ifdef IRCOMM_NO_TX_BEFORE_INIT |
671 | /* We didn't consume anything, TTY will retry */ | |
672 | return 0; | |
673 | #endif | |
674 | } | |
675 | ||
676 | if (count < 1) | |
677 | return 0; | |
678 | ||
679 | /* Protect our manipulation of self->tx_skb and related */ | |
680 | spin_lock_irqsave(&self->spinlock, flags); | |
681 | ||
682 | /* Fetch current transmit buffer */ | |
683 | skb = self->tx_skb; | |
684 | ||
6819bc2e | 685 | /* |
1da177e4 LT |
686 | * Send out all the data we get, possibly as multiple fragmented |
687 | * frames, but this will only happen if the data is larger than the | |
688 | * max data size. The normal case however is just the opposite, and | |
689 | * this function may be called multiple times, and will then actually | |
6819bc2e | 690 | * defragment the data and send it out as one packet as soon as |
1da177e4 LT |
691 | * possible, but at a safer point in time |
692 | */ | |
693 | while (count) { | |
694 | size = count; | |
695 | ||
696 | /* Adjust data size to the max data size */ | |
697 | if (size > self->max_data_size) | |
698 | size = self->max_data_size; | |
6819bc2e YH |
699 | |
700 | /* | |
1da177e4 | 701 | * Do we already have a buffer ready for transmit, or do |
6819bc2e | 702 | * we need to allocate a new frame |
1da177e4 | 703 | */ |
6819bc2e YH |
704 | if (skb) { |
705 | /* | |
706 | * Any room for more data at the end of the current | |
1da177e4 | 707 | * transmit buffer? Cannot use skb_tailroom, since |
6819bc2e | 708 | * dev_alloc_skb gives us a larger skb than we |
1da177e4 LT |
709 | * requested |
710 | * Note : use tx_data_size, because max_data_size | |
711 | * may have changed and we don't want to overwrite | |
712 | * the skb. - Jean II | |
713 | */ | |
714 | if ((tailroom = (self->tx_data_size - skb->len)) > 0) { | |
715 | /* Adjust data to tailroom */ | |
716 | if (size > tailroom) | |
717 | size = tailroom; | |
718 | } else { | |
6819bc2e YH |
719 | /* |
720 | * Current transmit frame is full, so break | |
1da177e4 LT |
721 | * out, so we can send it as soon as possible |
722 | */ | |
723 | break; | |
724 | } | |
725 | } else { | |
726 | /* Prepare a full sized frame */ | |
485fb2c9 SO |
727 | skb = alloc_skb(self->max_data_size+ |
728 | self->max_header_size, | |
729 | GFP_ATOMIC); | |
1da177e4 LT |
730 | if (!skb) { |
731 | spin_unlock_irqrestore(&self->spinlock, flags); | |
732 | return -ENOBUFS; | |
733 | } | |
734 | skb_reserve(skb, self->max_header_size); | |
735 | self->tx_skb = skb; | |
736 | /* Remember skb size because max_data_size may | |
737 | * change later on - Jean II */ | |
738 | self->tx_data_size = self->max_data_size; | |
739 | } | |
740 | ||
741 | /* Copy data */ | |
742 | memcpy(skb_put(skb,size), buf + len, size); | |
743 | ||
744 | count -= size; | |
745 | len += size; | |
746 | } | |
747 | ||
748 | spin_unlock_irqrestore(&self->spinlock, flags); | |
749 | ||
6819bc2e | 750 | /* |
1da177e4 LT |
751 | * Schedule a new thread which will transmit the frame as soon |
752 | * as possible, but at a safe point in time. We do this so the | |
753 | * "user" can give us data multiple times, as PPP does (because of | |
754 | * its 256 byte tx buffer). We will then defragment and send out | |
6819bc2e | 755 | * all this data as one single packet. |
1da177e4 LT |
756 | */ |
757 | schedule_work(&self->tqueue); | |
6819bc2e | 758 | |
1da177e4 LT |
759 | return len; |
760 | } | |
761 | ||
762 | /* | |
763 | * Function ircomm_tty_write_room (tty) | |
764 | * | |
765 | * This routine returns the numbers of characters the tty driver will | |
766 | * accept for queuing to be written. This number is subject to change as | |
767 | * output buffers get emptied, or if the output flow control is acted. | |
768 | */ | |
769 | static int ircomm_tty_write_room(struct tty_struct *tty) | |
770 | { | |
771 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
772 | unsigned long flags; | |
773 | int ret; | |
774 | ||
775 | IRDA_ASSERT(self != NULL, return -1;); | |
776 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
777 | ||
778 | #ifdef IRCOMM_NO_TX_BEFORE_INIT | |
779 | /* max_header_size tells us if the channel is initialised or not. */ | |
780 | if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) | |
781 | /* Don't bother us yet */ | |
782 | return 0; | |
783 | #endif | |
784 | ||
785 | /* Check if we are allowed to transmit any data. | |
786 | * hw_stopped is the regular flow control. | |
787 | * Jean II */ | |
788 | if (tty->hw_stopped) | |
789 | ret = 0; | |
790 | else { | |
791 | spin_lock_irqsave(&self->spinlock, flags); | |
792 | if (self->tx_skb) | |
793 | ret = self->tx_data_size - self->tx_skb->len; | |
794 | else | |
795 | ret = self->max_data_size; | |
796 | spin_unlock_irqrestore(&self->spinlock, flags); | |
797 | } | |
0dc47877 | 798 | IRDA_DEBUG(2, "%s(), ret=%d\n", __func__ , ret); |
1da177e4 LT |
799 | |
800 | return ret; | |
801 | } | |
802 | ||
803 | /* | |
804 | * Function ircomm_tty_wait_until_sent (tty, timeout) | |
805 | * | |
806 | * This routine waits until the device has written out all of the | |
807 | * characters in its transmitter FIFO. | |
808 | */ | |
809 | static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout) | |
810 | { | |
811 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
812 | unsigned long orig_jiffies, poll_time; | |
813 | unsigned long flags; | |
6819bc2e | 814 | |
0dc47877 | 815 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 LT |
816 | |
817 | IRDA_ASSERT(self != NULL, return;); | |
818 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
819 | ||
820 | orig_jiffies = jiffies; | |
821 | ||
822 | /* Set poll time to 200 ms */ | |
823 | poll_time = IRDA_MIN(timeout, msecs_to_jiffies(200)); | |
824 | ||
825 | spin_lock_irqsave(&self->spinlock, flags); | |
826 | while (self->tx_skb && self->tx_skb->len) { | |
827 | spin_unlock_irqrestore(&self->spinlock, flags); | |
121caf57 | 828 | schedule_timeout_interruptible(poll_time); |
1da177e4 LT |
829 | spin_lock_irqsave(&self->spinlock, flags); |
830 | if (signal_pending(current)) | |
831 | break; | |
832 | if (timeout && time_after(jiffies, orig_jiffies + timeout)) | |
833 | break; | |
834 | } | |
835 | spin_unlock_irqrestore(&self->spinlock, flags); | |
836 | current->state = TASK_RUNNING; | |
837 | } | |
838 | ||
839 | /* | |
840 | * Function ircomm_tty_throttle (tty) | |
841 | * | |
842 | * This routine notifies the tty driver that input buffers for the line | |
843 | * discipline are close to full, and it should somehow signal that no | |
6819bc2e | 844 | * more characters should be sent to the tty. |
1da177e4 LT |
845 | */ |
846 | static void ircomm_tty_throttle(struct tty_struct *tty) | |
847 | { | |
848 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
849 | ||
0dc47877 | 850 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 LT |
851 | |
852 | IRDA_ASSERT(self != NULL, return;); | |
853 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
854 | ||
855 | /* Software flow control? */ | |
856 | if (I_IXOFF(tty)) | |
857 | ircomm_tty_send_xchar(tty, STOP_CHAR(tty)); | |
6819bc2e | 858 | |
1da177e4 | 859 | /* Hardware flow control? */ |
adc8d746 | 860 | if (tty->termios.c_cflag & CRTSCTS) { |
1da177e4 LT |
861 | self->settings.dte &= ~IRCOMM_RTS; |
862 | self->settings.dte |= IRCOMM_DELTA_RTS; | |
6819bc2e | 863 | |
1da177e4 LT |
864 | ircomm_param_request(self, IRCOMM_DTE, TRUE); |
865 | } | |
866 | ||
6819bc2e | 867 | ircomm_flow_request(self->ircomm, FLOW_STOP); |
1da177e4 LT |
868 | } |
869 | ||
870 | /* | |
871 | * Function ircomm_tty_unthrottle (tty) | |
872 | * | |
873 | * This routine notifies the tty drivers that it should signals that | |
874 | * characters can now be sent to the tty without fear of overrunning the | |
875 | * input buffers of the line disciplines. | |
876 | */ | |
877 | static void ircomm_tty_unthrottle(struct tty_struct *tty) | |
878 | { | |
879 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
880 | ||
0dc47877 | 881 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 LT |
882 | |
883 | IRDA_ASSERT(self != NULL, return;); | |
884 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
885 | ||
886 | /* Using software flow control? */ | |
887 | if (I_IXOFF(tty)) { | |
888 | ircomm_tty_send_xchar(tty, START_CHAR(tty)); | |
889 | } | |
890 | ||
891 | /* Using hardware flow control? */ | |
adc8d746 | 892 | if (tty->termios.c_cflag & CRTSCTS) { |
1da177e4 LT |
893 | self->settings.dte |= (IRCOMM_RTS|IRCOMM_DELTA_RTS); |
894 | ||
895 | ircomm_param_request(self, IRCOMM_DTE, TRUE); | |
0dc47877 | 896 | IRDA_DEBUG(1, "%s(), FLOW_START\n", __func__ ); |
1da177e4 | 897 | } |
6819bc2e | 898 | ircomm_flow_request(self->ircomm, FLOW_START); |
1da177e4 LT |
899 | } |
900 | ||
901 | /* | |
902 | * Function ircomm_tty_chars_in_buffer (tty) | |
903 | * | |
904 | * Indicates if there are any data in the buffer | |
905 | * | |
906 | */ | |
907 | static int ircomm_tty_chars_in_buffer(struct tty_struct *tty) | |
908 | { | |
909 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
910 | unsigned long flags; | |
911 | int len = 0; | |
912 | ||
913 | IRDA_ASSERT(self != NULL, return -1;); | |
914 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
915 | ||
916 | spin_lock_irqsave(&self->spinlock, flags); | |
917 | ||
918 | if (self->tx_skb) | |
919 | len = self->tx_skb->len; | |
920 | ||
921 | spin_unlock_irqrestore(&self->spinlock, flags); | |
922 | ||
923 | return len; | |
924 | } | |
925 | ||
926 | static void ircomm_tty_shutdown(struct ircomm_tty_cb *self) | |
927 | { | |
928 | unsigned long flags; | |
929 | ||
930 | IRDA_ASSERT(self != NULL, return;); | |
931 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
932 | ||
0dc47877 | 933 | IRDA_DEBUG(0, "%s()\n", __func__ ); |
1da177e4 | 934 | |
849d5a99 | 935 | if (!test_and_clear_bit(ASYNCB_INITIALIZED, &self->port.flags)) |
1da177e4 LT |
936 | return; |
937 | ||
938 | ircomm_tty_detach_cable(self); | |
939 | ||
940 | spin_lock_irqsave(&self->spinlock, flags); | |
941 | ||
942 | del_timer(&self->watchdog_timer); | |
6819bc2e | 943 | |
1da177e4 LT |
944 | /* Free parameter buffer */ |
945 | if (self->ctrl_skb) { | |
946 | dev_kfree_skb(self->ctrl_skb); | |
947 | self->ctrl_skb = NULL; | |
948 | } | |
949 | ||
950 | /* Free transmit buffer */ | |
951 | if (self->tx_skb) { | |
952 | dev_kfree_skb(self->tx_skb); | |
953 | self->tx_skb = NULL; | |
954 | } | |
955 | ||
956 | if (self->ircomm) { | |
957 | ircomm_close(self->ircomm); | |
958 | self->ircomm = NULL; | |
959 | } | |
960 | ||
961 | spin_unlock_irqrestore(&self->spinlock, flags); | |
962 | } | |
963 | ||
964 | /* | |
965 | * Function ircomm_tty_hangup (tty) | |
966 | * | |
967 | * This routine notifies the tty driver that it should hangup the tty | |
968 | * device. | |
6819bc2e | 969 | * |
1da177e4 LT |
970 | */ |
971 | static void ircomm_tty_hangup(struct tty_struct *tty) | |
972 | { | |
973 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
38c58032 | 974 | struct tty_port *port = &self->port; |
1da177e4 LT |
975 | unsigned long flags; |
976 | ||
0dc47877 | 977 | IRDA_DEBUG(0, "%s()\n", __func__ ); |
1da177e4 LT |
978 | |
979 | IRDA_ASSERT(self != NULL, return;); | |
980 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
981 | ||
1da177e4 LT |
982 | /* ircomm_tty_flush_buffer(tty); */ |
983 | ircomm_tty_shutdown(self); | |
984 | ||
38c58032 JS |
985 | spin_lock_irqsave(&port->lock, flags); |
986 | port->flags &= ~ASYNC_NORMAL_ACTIVE; | |
987 | if (port->tty) { | |
988 | set_bit(TTY_IO_ERROR, &port->tty->flags); | |
989 | tty_kref_put(port->tty); | |
62f228ac | 990 | } |
38c58032 JS |
991 | port->tty = NULL; |
992 | port->count = 0; | |
993 | spin_unlock_irqrestore(&port->lock, flags); | |
1da177e4 | 994 | |
38c58032 | 995 | wake_up_interruptible(&port->open_wait); |
1da177e4 LT |
996 | } |
997 | ||
998 | /* | |
999 | * Function ircomm_tty_send_xchar (tty, ch) | |
1000 | * | |
1001 | * This routine is used to send a high-priority XON/XOFF character to | |
1002 | * the device. | |
1003 | */ | |
1004 | static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch) | |
1005 | { | |
0dc47877 | 1006 | IRDA_DEBUG(0, "%s(), not impl\n", __func__ ); |
1da177e4 LT |
1007 | } |
1008 | ||
1009 | /* | |
1010 | * Function ircomm_tty_start (tty) | |
1011 | * | |
1012 | * This routine notifies the tty driver that it resume sending | |
6819bc2e | 1013 | * characters to the tty device. |
1da177e4 LT |
1014 | */ |
1015 | void ircomm_tty_start(struct tty_struct *tty) | |
1016 | { | |
1017 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
1018 | ||
1019 | ircomm_flow_request(self->ircomm, FLOW_START); | |
1020 | } | |
1021 | ||
1022 | /* | |
1023 | * Function ircomm_tty_stop (tty) | |
1024 | * | |
1025 | * This routine notifies the tty driver that it should stop outputting | |
6819bc2e | 1026 | * characters to the tty device. |
1da177e4 | 1027 | */ |
6819bc2e | 1028 | static void ircomm_tty_stop(struct tty_struct *tty) |
1da177e4 LT |
1029 | { |
1030 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
1031 | ||
1032 | IRDA_ASSERT(self != NULL, return;); | |
1033 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
1034 | ||
1035 | ircomm_flow_request(self->ircomm, FLOW_STOP); | |
1036 | } | |
1037 | ||
1038 | /* | |
1039 | * Function ircomm_check_modem_status (self) | |
1040 | * | |
1041 | * Check for any changes in the DCE's line settings. This function should | |
1042 | * be called whenever the dce parameter settings changes, to update the | |
1043 | * flow control settings and other things | |
1044 | */ | |
1045 | void ircomm_tty_check_modem_status(struct ircomm_tty_cb *self) | |
1046 | { | |
1047 | struct tty_struct *tty; | |
1048 | int status; | |
1049 | ||
0dc47877 | 1050 | IRDA_DEBUG(0, "%s()\n", __func__ ); |
1da177e4 LT |
1051 | |
1052 | IRDA_ASSERT(self != NULL, return;); | |
1053 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
1054 | ||
62f228ac | 1055 | tty = tty_port_tty_get(&self->port); |
1da177e4 LT |
1056 | |
1057 | status = self->settings.dce; | |
1058 | ||
1059 | if (status & IRCOMM_DCE_DELTA_ANY) { | |
1060 | /*wake_up_interruptible(&self->delta_msr_wait);*/ | |
1061 | } | |
849d5a99 | 1062 | if ((self->port.flags & ASYNC_CHECK_CD) && (status & IRCOMM_DELTA_CD)) { |
6819bc2e | 1063 | IRDA_DEBUG(2, |
0dc47877 | 1064 | "%s(), ircomm%d CD now %s...\n", __func__ , self->line, |
1da177e4 LT |
1065 | (status & IRCOMM_CD) ? "on" : "off"); |
1066 | ||
1067 | if (status & IRCOMM_CD) { | |
a3cc9fcf | 1068 | wake_up_interruptible(&self->port.open_wait); |
1da177e4 | 1069 | } else { |
6819bc2e | 1070 | IRDA_DEBUG(2, |
0dc47877 | 1071 | "%s(), Doing serial hangup..\n", __func__ ); |
1da177e4 LT |
1072 | if (tty) |
1073 | tty_hangup(tty); | |
1074 | ||
1075 | /* Hangup will remote the tty, so better break out */ | |
62f228ac | 1076 | goto put; |
1da177e4 LT |
1077 | } |
1078 | } | |
f21ec3d2 | 1079 | if (tty && tty_port_cts_enabled(&self->port)) { |
1da177e4 LT |
1080 | if (tty->hw_stopped) { |
1081 | if (status & IRCOMM_CTS) { | |
6819bc2e | 1082 | IRDA_DEBUG(2, |
0dc47877 | 1083 | "%s(), CTS tx start...\n", __func__ ); |
1da177e4 | 1084 | tty->hw_stopped = 0; |
6819bc2e | 1085 | |
1da177e4 | 1086 | /* Wake up processes blocked on open */ |
a3cc9fcf | 1087 | wake_up_interruptible(&self->port.open_wait); |
1da177e4 LT |
1088 | |
1089 | schedule_work(&self->tqueue); | |
62f228ac | 1090 | goto put; |
1da177e4 LT |
1091 | } |
1092 | } else { | |
1093 | if (!(status & IRCOMM_CTS)) { | |
6819bc2e | 1094 | IRDA_DEBUG(2, |
0dc47877 | 1095 | "%s(), CTS tx stop...\n", __func__ ); |
1da177e4 LT |
1096 | tty->hw_stopped = 1; |
1097 | } | |
1098 | } | |
1099 | } | |
62f228ac JS |
1100 | put: |
1101 | tty_kref_put(tty); | |
1da177e4 LT |
1102 | } |
1103 | ||
1104 | /* | |
1105 | * Function ircomm_tty_data_indication (instance, sap, skb) | |
1106 | * | |
1107 | * Handle incoming data, and deliver it to the line discipline | |
1108 | * | |
1109 | */ | |
1110 | static int ircomm_tty_data_indication(void *instance, void *sap, | |
1111 | struct sk_buff *skb) | |
1112 | { | |
1113 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; | |
62f228ac | 1114 | struct tty_struct *tty; |
1da177e4 | 1115 | |
0dc47877 | 1116 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
6819bc2e | 1117 | |
1da177e4 LT |
1118 | IRDA_ASSERT(self != NULL, return -1;); |
1119 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
1120 | IRDA_ASSERT(skb != NULL, return -1;); | |
1121 | ||
62f228ac JS |
1122 | tty = tty_port_tty_get(&self->port); |
1123 | if (!tty) { | |
0dc47877 | 1124 | IRDA_DEBUG(0, "%s(), no tty!\n", __func__ ); |
1da177e4 LT |
1125 | return 0; |
1126 | } | |
1127 | ||
6819bc2e | 1128 | /* |
1da177e4 LT |
1129 | * If we receive data when hardware is stopped then something is wrong. |
1130 | * We try to poll the peers line settings to check if we are up todate. | |
6819bc2e | 1131 | * Devices like WinCE can do this, and since they don't send any |
1da177e4 LT |
1132 | * params, we can just as well declare the hardware for running. |
1133 | */ | |
62f228ac | 1134 | if (tty->hw_stopped && (self->flow == FLOW_START)) { |
0dc47877 | 1135 | IRDA_DEBUG(0, "%s(), polling for line settings!\n", __func__ ); |
1da177e4 LT |
1136 | ircomm_param_request(self, IRCOMM_POLL, TRUE); |
1137 | ||
1138 | /* We can just as well declare the hardware for running */ | |
1139 | ircomm_tty_send_initial_parameters(self); | |
1140 | ircomm_tty_link_established(self); | |
1141 | } | |
2e124b4a | 1142 | tty_kref_put(tty); |
1da177e4 | 1143 | |
6819bc2e | 1144 | /* |
cbfd1526 AV |
1145 | * Use flip buffer functions since the code may be called from interrupt |
1146 | * context | |
1da177e4 | 1147 | */ |
05c7cd39 | 1148 | tty_insert_flip_string(&self->port, skb->data, skb->len); |
2e124b4a | 1149 | tty_flip_buffer_push(&self->port); |
1da177e4 LT |
1150 | |
1151 | /* No need to kfree_skb - see ircomm_ttp_data_indication() */ | |
1152 | ||
1153 | return 0; | |
1154 | } | |
1155 | ||
1156 | /* | |
1157 | * Function ircomm_tty_control_indication (instance, sap, skb) | |
1158 | * | |
1159 | * Parse all incoming parameters (easy!) | |
1160 | * | |
1161 | */ | |
1162 | static int ircomm_tty_control_indication(void *instance, void *sap, | |
1163 | struct sk_buff *skb) | |
1164 | { | |
1165 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; | |
1166 | int clen; | |
1167 | ||
0dc47877 | 1168 | IRDA_DEBUG(4, "%s()\n", __func__ ); |
6819bc2e | 1169 | |
1da177e4 LT |
1170 | IRDA_ASSERT(self != NULL, return -1;); |
1171 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
1172 | IRDA_ASSERT(skb != NULL, return -1;); | |
1173 | ||
1174 | clen = skb->data[0]; | |
1175 | ||
6819bc2e | 1176 | irda_param_extract_all(self, skb->data+1, IRDA_MIN(skb->len-1, clen), |
1da177e4 LT |
1177 | &ircomm_param_info); |
1178 | ||
1179 | /* No need to kfree_skb - see ircomm_control_indication() */ | |
1180 | ||
1181 | return 0; | |
1182 | } | |
1183 | ||
1184 | /* | |
1185 | * Function ircomm_tty_flow_indication (instance, sap, cmd) | |
1186 | * | |
1187 | * This function is called by IrTTP when it wants us to slow down the | |
1188 | * transmission of data. We just mark the hardware as stopped, and wait | |
1189 | * for IrTTP to notify us that things are OK again. | |
1190 | */ | |
6819bc2e | 1191 | static void ircomm_tty_flow_indication(void *instance, void *sap, |
1da177e4 LT |
1192 | LOCAL_FLOW cmd) |
1193 | { | |
1194 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; | |
1195 | struct tty_struct *tty; | |
1196 | ||
1197 | IRDA_ASSERT(self != NULL, return;); | |
1198 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
1199 | ||
62f228ac | 1200 | tty = tty_port_tty_get(&self->port); |
1da177e4 LT |
1201 | |
1202 | switch (cmd) { | |
1203 | case FLOW_START: | |
0dc47877 | 1204 | IRDA_DEBUG(2, "%s(), hw start!\n", __func__ ); |
62f228ac JS |
1205 | if (tty) |
1206 | tty->hw_stopped = 0; | |
1da177e4 LT |
1207 | |
1208 | /* ircomm_tty_do_softint will take care of the rest */ | |
1209 | schedule_work(&self->tqueue); | |
1210 | break; | |
1211 | default: /* If we get here, something is very wrong, better stop */ | |
1212 | case FLOW_STOP: | |
0dc47877 | 1213 | IRDA_DEBUG(2, "%s(), hw stopped!\n", __func__ ); |
62f228ac JS |
1214 | if (tty) |
1215 | tty->hw_stopped = 1; | |
1da177e4 LT |
1216 | break; |
1217 | } | |
62f228ac JS |
1218 | |
1219 | tty_kref_put(tty); | |
1da177e4 LT |
1220 | self->flow = cmd; |
1221 | } | |
1222 | ||
92b05e13 | 1223 | #ifdef CONFIG_PROC_FS |
3d304176 | 1224 | static void ircomm_tty_line_info(struct ircomm_tty_cb *self, struct seq_file *m) |
1da177e4 | 1225 | { |
62f228ac | 1226 | struct tty_struct *tty; |
3d304176 | 1227 | char sep; |
1da177e4 | 1228 | |
3d304176 | 1229 | seq_printf(m, "State: %s\n", ircomm_tty_state[self->state]); |
1da177e4 | 1230 | |
3d304176 | 1231 | seq_puts(m, "Service type: "); |
1da177e4 | 1232 | if (self->service_type & IRCOMM_9_WIRE) |
3d304176 | 1233 | seq_puts(m, "9_WIRE"); |
1da177e4 | 1234 | else if (self->service_type & IRCOMM_3_WIRE) |
3d304176 | 1235 | seq_puts(m, "3_WIRE"); |
1da177e4 | 1236 | else if (self->service_type & IRCOMM_3_WIRE_RAW) |
3d304176 | 1237 | seq_puts(m, "3_WIRE_RAW"); |
1da177e4 | 1238 | else |
3d304176 AD |
1239 | seq_puts(m, "No common service type!\n"); |
1240 | seq_putc(m, '\n'); | |
1241 | ||
1242 | seq_printf(m, "Port name: %s\n", self->settings.port_name); | |
1243 | ||
1244 | seq_printf(m, "DTE status:"); | |
1245 | sep = ' '; | |
1246 | if (self->settings.dte & IRCOMM_RTS) { | |
1247 | seq_printf(m, "%cRTS", sep); | |
1248 | sep = '|'; | |
1249 | } | |
1250 | if (self->settings.dte & IRCOMM_DTR) { | |
1251 | seq_printf(m, "%cDTR", sep); | |
1252 | sep = '|'; | |
1253 | } | |
1254 | seq_putc(m, '\n'); | |
1255 | ||
1256 | seq_puts(m, "DCE status:"); | |
1257 | sep = ' '; | |
1258 | if (self->settings.dce & IRCOMM_CTS) { | |
1259 | seq_printf(m, "%cCTS", sep); | |
1260 | sep = '|'; | |
1261 | } | |
1262 | if (self->settings.dce & IRCOMM_DSR) { | |
1263 | seq_printf(m, "%cDSR", sep); | |
1264 | sep = '|'; | |
1265 | } | |
1266 | if (self->settings.dce & IRCOMM_CD) { | |
1267 | seq_printf(m, "%cCD", sep); | |
1268 | sep = '|'; | |
1269 | } | |
1270 | if (self->settings.dce & IRCOMM_RI) { | |
1271 | seq_printf(m, "%cRI", sep); | |
1272 | sep = '|'; | |
1273 | } | |
1274 | seq_putc(m, '\n'); | |
1275 | ||
1276 | seq_puts(m, "Configuration: "); | |
1da177e4 | 1277 | if (!self->settings.null_modem) |
3d304176 | 1278 | seq_puts(m, "DTE <-> DCE\n"); |
1da177e4 | 1279 | else |
3d304176 AD |
1280 | seq_puts(m, "DTE <-> DTE (null modem emulation)\n"); |
1281 | ||
1282 | seq_printf(m, "Data rate: %d\n", self->settings.data_rate); | |
1283 | ||
1284 | seq_puts(m, "Flow control:"); | |
1285 | sep = ' '; | |
1286 | if (self->settings.flow_control & IRCOMM_XON_XOFF_IN) { | |
1287 | seq_printf(m, "%cXON_XOFF_IN", sep); | |
1288 | sep = '|'; | |
1289 | } | |
1290 | if (self->settings.flow_control & IRCOMM_XON_XOFF_OUT) { | |
1291 | seq_printf(m, "%cXON_XOFF_OUT", sep); | |
1292 | sep = '|'; | |
1293 | } | |
1294 | if (self->settings.flow_control & IRCOMM_RTS_CTS_IN) { | |
1295 | seq_printf(m, "%cRTS_CTS_IN", sep); | |
1296 | sep = '|'; | |
1297 | } | |
1298 | if (self->settings.flow_control & IRCOMM_RTS_CTS_OUT) { | |
1299 | seq_printf(m, "%cRTS_CTS_OUT", sep); | |
1300 | sep = '|'; | |
1301 | } | |
1302 | if (self->settings.flow_control & IRCOMM_DSR_DTR_IN) { | |
1303 | seq_printf(m, "%cDSR_DTR_IN", sep); | |
1304 | sep = '|'; | |
1305 | } | |
1306 | if (self->settings.flow_control & IRCOMM_DSR_DTR_OUT) { | |
1307 | seq_printf(m, "%cDSR_DTR_OUT", sep); | |
1308 | sep = '|'; | |
1309 | } | |
1310 | if (self->settings.flow_control & IRCOMM_ENQ_ACK_IN) { | |
1311 | seq_printf(m, "%cENQ_ACK_IN", sep); | |
1312 | sep = '|'; | |
1313 | } | |
1314 | if (self->settings.flow_control & IRCOMM_ENQ_ACK_OUT) { | |
1315 | seq_printf(m, "%cENQ_ACK_OUT", sep); | |
1316 | sep = '|'; | |
1317 | } | |
1318 | seq_putc(m, '\n'); | |
1319 | ||
1320 | seq_puts(m, "Flags:"); | |
1321 | sep = ' '; | |
f21ec3d2 | 1322 | if (tty_port_cts_enabled(&self->port)) { |
3d304176 AD |
1323 | seq_printf(m, "%cASYNC_CTS_FLOW", sep); |
1324 | sep = '|'; | |
1325 | } | |
849d5a99 | 1326 | if (self->port.flags & ASYNC_CHECK_CD) { |
3d304176 AD |
1327 | seq_printf(m, "%cASYNC_CHECK_CD", sep); |
1328 | sep = '|'; | |
1329 | } | |
849d5a99 | 1330 | if (self->port.flags & ASYNC_INITIALIZED) { |
3d304176 AD |
1331 | seq_printf(m, "%cASYNC_INITIALIZED", sep); |
1332 | sep = '|'; | |
1333 | } | |
849d5a99 | 1334 | if (self->port.flags & ASYNC_LOW_LATENCY) { |
3d304176 AD |
1335 | seq_printf(m, "%cASYNC_LOW_LATENCY", sep); |
1336 | sep = '|'; | |
1337 | } | |
849d5a99 | 1338 | if (self->port.flags & ASYNC_CLOSING) { |
3d304176 AD |
1339 | seq_printf(m, "%cASYNC_CLOSING", sep); |
1340 | sep = '|'; | |
1341 | } | |
849d5a99 | 1342 | if (self->port.flags & ASYNC_NORMAL_ACTIVE) { |
3d304176 AD |
1343 | seq_printf(m, "%cASYNC_NORMAL_ACTIVE", sep); |
1344 | sep = '|'; | |
1345 | } | |
1346 | seq_putc(m, '\n'); | |
1347 | ||
1348 | seq_printf(m, "Role: %s\n", self->client ? "client" : "server"); | |
580d27b4 | 1349 | seq_printf(m, "Open count: %d\n", self->port.count); |
3d304176 AD |
1350 | seq_printf(m, "Max data size: %d\n", self->max_data_size); |
1351 | seq_printf(m, "Max header size: %d\n", self->max_header_size); | |
6819bc2e | 1352 | |
62f228ac JS |
1353 | tty = tty_port_tty_get(&self->port); |
1354 | if (tty) { | |
3d304176 | 1355 | seq_printf(m, "Hardware: %s\n", |
62f228ac JS |
1356 | tty->hw_stopped ? "Stopped" : "Running"); |
1357 | tty_kref_put(tty); | |
1358 | } | |
1da177e4 LT |
1359 | } |
1360 | ||
3d304176 | 1361 | static int ircomm_tty_proc_show(struct seq_file *m, void *v) |
1da177e4 LT |
1362 | { |
1363 | struct ircomm_tty_cb *self; | |
1da177e4 LT |
1364 | unsigned long flags; |
1365 | ||
1366 | spin_lock_irqsave(&ircomm_tty->hb_spinlock, flags); | |
1367 | ||
1368 | self = (struct ircomm_tty_cb *) hashbin_get_first(ircomm_tty); | |
3d304176 | 1369 | while (self != NULL) { |
1da177e4 LT |
1370 | if (self->magic != IRCOMM_TTY_MAGIC) |
1371 | break; | |
1372 | ||
3d304176 | 1373 | ircomm_tty_line_info(self, m); |
1da177e4 | 1374 | self = (struct ircomm_tty_cb *) hashbin_get_next(ircomm_tty); |
6819bc2e | 1375 | } |
1da177e4 | 1376 | spin_unlock_irqrestore(&ircomm_tty->hb_spinlock, flags); |
3d304176 AD |
1377 | return 0; |
1378 | } | |
1da177e4 | 1379 | |
3d304176 AD |
1380 | static int ircomm_tty_proc_open(struct inode *inode, struct file *file) |
1381 | { | |
1382 | return single_open(file, ircomm_tty_proc_show, NULL); | |
1da177e4 | 1383 | } |
3d304176 AD |
1384 | |
1385 | static const struct file_operations ircomm_tty_proc_fops = { | |
1386 | .owner = THIS_MODULE, | |
1387 | .open = ircomm_tty_proc_open, | |
1388 | .read = seq_read, | |
1389 | .llseek = seq_lseek, | |
1390 | .release = single_release, | |
1391 | }; | |
1da177e4 LT |
1392 | #endif /* CONFIG_PROC_FS */ |
1393 | ||
1394 | MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>"); | |
1395 | MODULE_DESCRIPTION("IrCOMM serial TTY driver"); | |
1396 | MODULE_LICENSE("GPL"); | |
1397 | MODULE_ALIAS_CHARDEV_MAJOR(IRCOMM_TTY_MAJOR); | |
1398 | ||
1399 | module_init(ircomm_tty_init); | |
1400 | module_exit(ircomm_tty_cleanup); |