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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 | ||
55 | static int ircomm_tty_open(struct tty_struct *tty, struct file *filp); | |
56 | static void ircomm_tty_close(struct tty_struct * tty, struct file *filp); | |
57 | static int ircomm_tty_write(struct tty_struct * tty, | |
58 | const unsigned char *buf, int count); | |
59 | static int ircomm_tty_write_room(struct tty_struct *tty); | |
60 | static void ircomm_tty_throttle(struct tty_struct *tty); | |
61 | static void ircomm_tty_unthrottle(struct tty_struct *tty); | |
62 | static int ircomm_tty_chars_in_buffer(struct tty_struct *tty); | |
63 | static void ircomm_tty_flush_buffer(struct tty_struct *tty); | |
64 | static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch); | |
65 | static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout); | |
66 | static void ircomm_tty_hangup(struct tty_struct *tty); | |
c4028958 | 67 | static void ircomm_tty_do_softint(struct work_struct *work); |
1da177e4 LT |
68 | static void ircomm_tty_shutdown(struct ircomm_tty_cb *self); |
69 | static void ircomm_tty_stop(struct tty_struct *tty); | |
70 | ||
71 | static int ircomm_tty_data_indication(void *instance, void *sap, | |
72 | struct sk_buff *skb); | |
73 | static int ircomm_tty_control_indication(void *instance, void *sap, | |
74 | struct sk_buff *skb); | |
6819bc2e | 75 | static void ircomm_tty_flow_indication(void *instance, void *sap, |
1da177e4 LT |
76 | LOCAL_FLOW cmd); |
77 | #ifdef CONFIG_PROC_FS | |
3d304176 | 78 | static const struct file_operations ircomm_tty_proc_fops; |
1da177e4 LT |
79 | #endif /* CONFIG_PROC_FS */ |
80 | static struct tty_driver *driver; | |
81 | ||
d76081f8 | 82 | static hashbin_t *ircomm_tty = NULL; |
1da177e4 | 83 | |
b68e31d0 | 84 | static const struct tty_operations ops = { |
1da177e4 LT |
85 | .open = ircomm_tty_open, |
86 | .close = ircomm_tty_close, | |
87 | .write = ircomm_tty_write, | |
88 | .write_room = ircomm_tty_write_room, | |
89 | .chars_in_buffer = ircomm_tty_chars_in_buffer, | |
90 | .flush_buffer = ircomm_tty_flush_buffer, | |
91 | .ioctl = ircomm_tty_ioctl, /* ircomm_tty_ioctl.c */ | |
92 | .tiocmget = ircomm_tty_tiocmget, /* ircomm_tty_ioctl.c */ | |
93 | .tiocmset = ircomm_tty_tiocmset, /* ircomm_tty_ioctl.c */ | |
94 | .throttle = ircomm_tty_throttle, | |
95 | .unthrottle = ircomm_tty_unthrottle, | |
96 | .send_xchar = ircomm_tty_send_xchar, | |
97 | .set_termios = ircomm_tty_set_termios, | |
98 | .stop = ircomm_tty_stop, | |
99 | .start = ircomm_tty_start, | |
100 | .hangup = ircomm_tty_hangup, | |
101 | .wait_until_sent = ircomm_tty_wait_until_sent, | |
102 | #ifdef CONFIG_PROC_FS | |
3d304176 | 103 | .proc_fops = &ircomm_tty_proc_fops, |
1da177e4 LT |
104 | #endif /* CONFIG_PROC_FS */ |
105 | }; | |
106 | ||
0ba9ff84 JS |
107 | static void ircomm_port_raise_dtr_rts(struct tty_port *port, int raise) |
108 | { | |
109 | struct ircomm_tty_cb *self = container_of(port, struct ircomm_tty_cb, | |
110 | port); | |
111 | /* | |
112 | * Here, we use to lock those two guys, but as ircomm_param_request() | |
113 | * does it itself, I don't see the point (and I see the deadlock). | |
114 | * Jean II | |
115 | */ | |
116 | if (raise) | |
117 | self->settings.dte |= IRCOMM_RTS | IRCOMM_DTR; | |
118 | else | |
119 | self->settings.dte &= ~(IRCOMM_RTS | IRCOMM_DTR); | |
120 | ||
121 | ircomm_param_request(self, IRCOMM_DTE, TRUE); | |
122 | } | |
123 | ||
124 | static int ircomm_port_carrier_raised(struct tty_port *port) | |
125 | { | |
126 | struct ircomm_tty_cb *self = container_of(port, struct ircomm_tty_cb, | |
127 | port); | |
128 | return self->settings.dce & IRCOMM_CD; | |
129 | } | |
130 | ||
131 | static const struct tty_port_operations ircomm_port_ops = { | |
132 | .dtr_rts = ircomm_port_raise_dtr_rts, | |
133 | .carrier_raised = ircomm_port_carrier_raised, | |
134 | }; | |
135 | ||
1da177e4 LT |
136 | /* |
137 | * Function ircomm_tty_init() | |
138 | * | |
139 | * Init IrCOMM TTY layer/driver | |
140 | * | |
141 | */ | |
142 | static int __init ircomm_tty_init(void) | |
143 | { | |
144 | driver = alloc_tty_driver(IRCOMM_TTY_PORTS); | |
145 | if (!driver) | |
146 | return -ENOMEM; | |
6819bc2e | 147 | ircomm_tty = hashbin_new(HB_LOCK); |
1da177e4 | 148 | if (ircomm_tty == NULL) { |
0dc47877 | 149 | IRDA_ERROR("%s(), can't allocate hashbin!\n", __func__); |
1da177e4 LT |
150 | put_tty_driver(driver); |
151 | return -ENOMEM; | |
152 | } | |
153 | ||
1da177e4 LT |
154 | driver->driver_name = "ircomm"; |
155 | driver->name = "ircomm"; | |
1da177e4 LT |
156 | driver->major = IRCOMM_TTY_MAJOR; |
157 | driver->minor_start = IRCOMM_TTY_MINOR; | |
158 | driver->type = TTY_DRIVER_TYPE_SERIAL; | |
159 | driver->subtype = SERIAL_TYPE_NORMAL; | |
160 | driver->init_termios = tty_std_termios; | |
161 | driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; | |
162 | driver->flags = TTY_DRIVER_REAL_RAW; | |
163 | tty_set_operations(driver, &ops); | |
164 | if (tty_register_driver(driver)) { | |
165 | IRDA_ERROR("%s(): Couldn't register serial driver\n", | |
0dc47877 | 166 | __func__); |
1da177e4 LT |
167 | put_tty_driver(driver); |
168 | return -1; | |
169 | } | |
170 | return 0; | |
171 | } | |
172 | ||
173 | static void __exit __ircomm_tty_cleanup(struct ircomm_tty_cb *self) | |
174 | { | |
0dc47877 | 175 | IRDA_DEBUG(0, "%s()\n", __func__ ); |
1da177e4 LT |
176 | |
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; | |
183 | kfree(self); | |
184 | } | |
185 | ||
186 | /* | |
187 | * Function ircomm_tty_cleanup () | |
188 | * | |
189 | * Remove IrCOMM TTY layer/driver | |
190 | * | |
191 | */ | |
192 | static void __exit ircomm_tty_cleanup(void) | |
193 | { | |
194 | int ret; | |
195 | ||
0dc47877 | 196 | IRDA_DEBUG(4, "%s()\n", __func__ ); |
1da177e4 LT |
197 | |
198 | ret = tty_unregister_driver(driver); | |
6819bc2e YH |
199 | if (ret) { |
200 | IRDA_ERROR("%s(), failed to unregister driver\n", | |
0dc47877 | 201 | __func__); |
1da177e4 LT |
202 | return; |
203 | } | |
204 | ||
205 | hashbin_delete(ircomm_tty, (FREE_FUNC) __ircomm_tty_cleanup); | |
206 | put_tty_driver(driver); | |
207 | } | |
208 | ||
209 | /* | |
210 | * Function ircomm_startup (self) | |
211 | * | |
6819bc2e | 212 | * |
1da177e4 LT |
213 | * |
214 | */ | |
215 | static int ircomm_tty_startup(struct ircomm_tty_cb *self) | |
216 | { | |
217 | notify_t notify; | |
218 | int ret = -ENODEV; | |
219 | ||
0dc47877 | 220 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 LT |
221 | |
222 | IRDA_ASSERT(self != NULL, return -1;); | |
223 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
224 | ||
225 | /* Check if already open */ | |
849d5a99 | 226 | if (test_and_set_bit(ASYNCB_INITIALIZED, &self->port.flags)) { |
0dc47877 | 227 | IRDA_DEBUG(2, "%s(), already open so break out!\n", __func__ ); |
1da177e4 LT |
228 | return 0; |
229 | } | |
230 | ||
231 | /* Register with IrCOMM */ | |
232 | irda_notify_init(¬ify); | |
233 | /* These callbacks we must handle ourselves */ | |
234 | notify.data_indication = ircomm_tty_data_indication; | |
235 | notify.udata_indication = ircomm_tty_control_indication; | |
6819bc2e | 236 | notify.flow_indication = ircomm_tty_flow_indication; |
1da177e4 LT |
237 | |
238 | /* Use the ircomm_tty interface for these ones */ | |
6819bc2e | 239 | notify.disconnect_indication = ircomm_tty_disconnect_indication; |
1da177e4 | 240 | notify.connect_confirm = ircomm_tty_connect_confirm; |
6819bc2e | 241 | notify.connect_indication = ircomm_tty_connect_indication; |
1da177e4 LT |
242 | strlcpy(notify.name, "ircomm_tty", sizeof(notify.name)); |
243 | notify.instance = self; | |
244 | ||
245 | if (!self->ircomm) { | |
6819bc2e | 246 | self->ircomm = ircomm_open(¬ify, self->service_type, |
1da177e4 LT |
247 | self->line); |
248 | } | |
249 | if (!self->ircomm) | |
250 | goto err; | |
251 | ||
252 | self->slsap_sel = self->ircomm->slsap_sel; | |
253 | ||
254 | /* Connect IrCOMM link with remote device */ | |
255 | ret = ircomm_tty_attach_cable(self); | |
256 | if (ret < 0) { | |
0dc47877 | 257 | IRDA_ERROR("%s(), error attaching cable!\n", __func__); |
1da177e4 LT |
258 | goto err; |
259 | } | |
260 | ||
261 | return 0; | |
262 | err: | |
849d5a99 | 263 | clear_bit(ASYNCB_INITIALIZED, &self->port.flags); |
1da177e4 LT |
264 | return ret; |
265 | } | |
266 | ||
267 | /* | |
268 | * Function ircomm_block_til_ready (self, filp) | |
269 | * | |
6819bc2e | 270 | * |
1da177e4 LT |
271 | * |
272 | */ | |
6819bc2e | 273 | static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self, |
62f228ac | 274 | struct tty_struct *tty, struct file *filp) |
1da177e4 | 275 | { |
38c58032 | 276 | struct tty_port *port = &self->port; |
1da177e4 LT |
277 | DECLARE_WAITQUEUE(wait, current); |
278 | int retval; | |
279 | int do_clocal = 0, extra_count = 0; | |
280 | unsigned long flags; | |
6819bc2e | 281 | |
0dc47877 | 282 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 | 283 | |
1da177e4 LT |
284 | /* |
285 | * If non-blocking mode is set, or the port is not enabled, | |
286 | * then make the check up front and then exit. | |
6819bc2e | 287 | */ |
1da177e4 LT |
288 | if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){ |
289 | /* nonblock mode is set or port is not enabled */ | |
38c58032 | 290 | port->flags |= ASYNC_NORMAL_ACTIVE; |
0dc47877 | 291 | IRDA_DEBUG(1, "%s(), O_NONBLOCK requested!\n", __func__ ); |
1da177e4 LT |
292 | return 0; |
293 | } | |
294 | ||
295 | if (tty->termios->c_cflag & CLOCAL) { | |
0dc47877 | 296 | IRDA_DEBUG(1, "%s(), doing CLOCAL!\n", __func__ ); |
1da177e4 LT |
297 | do_clocal = 1; |
298 | } | |
6819bc2e | 299 | |
1da177e4 LT |
300 | /* Wait for carrier detect and the line to become |
301 | * free (i.e., not in use by the callout). While we are in | |
38c58032 | 302 | * this loop, port->count is dropped by one, so that |
1da177e4 LT |
303 | * mgsl_close() knows when to free things. We restore it upon |
304 | * exit, either normal or abnormal. | |
305 | */ | |
6819bc2e | 306 | |
1da177e4 | 307 | retval = 0; |
38c58032 | 308 | add_wait_queue(&port->open_wait, &wait); |
6819bc2e | 309 | |
1da177e4 | 310 | IRDA_DEBUG(2, "%s(%d):block_til_ready before block on %s open_count=%d\n", |
38c58032 | 311 | __FILE__, __LINE__, tty->driver->name, port->count); |
1da177e4 | 312 | |
38c58032 | 313 | spin_lock_irqsave(&port->lock, flags); |
1da177e4 LT |
314 | if (!tty_hung_up_p(filp)) { |
315 | extra_count = 1; | |
38c58032 | 316 | port->count--; |
1da177e4 | 317 | } |
38c58032 JS |
318 | spin_unlock_irqrestore(&port->lock, flags); |
319 | port->blocked_open++; | |
6819bc2e | 320 | |
1da177e4 | 321 | while (1) { |
0ba9ff84 JS |
322 | if (tty->termios->c_cflag & CBAUD) |
323 | tty_port_raise_dtr_rts(port); | |
6819bc2e | 324 | |
1da177e4 | 325 | current->state = TASK_INTERRUPTIBLE; |
6819bc2e | 326 | |
1da177e4 | 327 | if (tty_hung_up_p(filp) || |
38c58032 JS |
328 | !test_bit(ASYNCB_INITIALIZED, &port->flags)) { |
329 | retval = (port->flags & ASYNC_HUP_NOTIFY) ? | |
1da177e4 LT |
330 | -EAGAIN : -ERESTARTSYS; |
331 | break; | |
332 | } | |
6819bc2e YH |
333 | |
334 | /* | |
1da177e4 LT |
335 | * Check if link is ready now. Even if CLOCAL is |
336 | * specified, we cannot return before the IrCOMM link is | |
6819bc2e | 337 | * ready |
1da177e4 | 338 | */ |
38c58032 | 339 | if (!test_bit(ASYNCB_CLOSING, &port->flags) && |
0ba9ff84 | 340 | (do_clocal || tty_port_carrier_raised(port)) && |
1da177e4 LT |
341 | self->state == IRCOMM_TTY_READY) |
342 | { | |
6819bc2e | 343 | break; |
1da177e4 | 344 | } |
6819bc2e | 345 | |
1da177e4 LT |
346 | if (signal_pending(current)) { |
347 | retval = -ERESTARTSYS; | |
348 | break; | |
349 | } | |
6819bc2e | 350 | |
1da177e4 | 351 | IRDA_DEBUG(1, "%s(%d):block_til_ready blocking on %s open_count=%d\n", |
38c58032 | 352 | __FILE__, __LINE__, tty->driver->name, port->count); |
6819bc2e | 353 | |
1da177e4 LT |
354 | schedule(); |
355 | } | |
6819bc2e | 356 | |
1da177e4 | 357 | __set_current_state(TASK_RUNNING); |
38c58032 | 358 | remove_wait_queue(&port->open_wait, &wait); |
6819bc2e | 359 | |
1da177e4 LT |
360 | if (extra_count) { |
361 | /* ++ is not atomic, so this should be protected - Jean II */ | |
38c58032 JS |
362 | spin_lock_irqsave(&port->lock, flags); |
363 | port->count++; | |
364 | spin_unlock_irqrestore(&port->lock, flags); | |
1da177e4 | 365 | } |
38c58032 | 366 | port->blocked_open--; |
6819bc2e | 367 | |
1da177e4 | 368 | IRDA_DEBUG(1, "%s(%d):block_til_ready after blocking on %s open_count=%d\n", |
38c58032 | 369 | __FILE__, __LINE__, tty->driver->name, port->count); |
6819bc2e | 370 | |
1da177e4 | 371 | if (!retval) |
38c58032 | 372 | port->flags |= ASYNC_NORMAL_ACTIVE; |
6819bc2e YH |
373 | |
374 | return retval; | |
1da177e4 LT |
375 | } |
376 | ||
377 | /* | |
378 | * Function ircomm_tty_open (tty, filp) | |
379 | * | |
380 | * This routine is called when a particular tty device is opened. This | |
381 | * routine is mandatory; if this routine is not filled in, the attempted | |
382 | * open will fail with ENODEV. | |
383 | */ | |
384 | static int ircomm_tty_open(struct tty_struct *tty, struct file *filp) | |
385 | { | |
386 | struct ircomm_tty_cb *self; | |
410235fd | 387 | unsigned int line = tty->index; |
1da177e4 LT |
388 | unsigned long flags; |
389 | int ret; | |
390 | ||
0dc47877 | 391 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 | 392 | |
1da177e4 LT |
393 | /* Check if instance already exists */ |
394 | self = hashbin_lock_find(ircomm_tty, line, NULL); | |
395 | if (!self) { | |
396 | /* No, so make new instance */ | |
0da974f4 | 397 | self = kzalloc(sizeof(struct ircomm_tty_cb), GFP_KERNEL); |
1da177e4 | 398 | if (self == NULL) { |
0dc47877 | 399 | IRDA_ERROR("%s(), kmalloc failed!\n", __func__); |
1da177e4 LT |
400 | return -ENOMEM; |
401 | } | |
6819bc2e | 402 | |
a3cc9fcf | 403 | tty_port_init(&self->port); |
0ba9ff84 | 404 | self->port.ops = &ircomm_port_ops; |
1da177e4 LT |
405 | self->magic = IRCOMM_TTY_MAGIC; |
406 | self->flow = FLOW_STOP; | |
407 | ||
408 | self->line = line; | |
c4028958 | 409 | INIT_WORK(&self->tqueue, ircomm_tty_do_softint); |
1da177e4 LT |
410 | self->max_header_size = IRCOMM_TTY_HDR_UNINITIALISED; |
411 | self->max_data_size = IRCOMM_TTY_DATA_UNINITIALISED; | |
1da177e4 LT |
412 | |
413 | /* Init some important stuff */ | |
414 | init_timer(&self->watchdog_timer); | |
1da177e4 LT |
415 | spin_lock_init(&self->spinlock); |
416 | ||
6819bc2e | 417 | /* |
1da177e4 LT |
418 | * Force TTY into raw mode by default which is usually what |
419 | * we want for IrCOMM and IrLPT. This way applications will | |
6819bc2e | 420 | * not have to twiddle with printcap etc. |
ad36b88e AC |
421 | * |
422 | * Note this is completely usafe and doesn't work properly | |
1da177e4 LT |
423 | */ |
424 | tty->termios->c_iflag = 0; | |
425 | tty->termios->c_oflag = 0; | |
426 | ||
427 | /* Insert into hash */ | |
a3cc9fcf | 428 | /* FIXME there is a window from find to here */ |
1da177e4 LT |
429 | hashbin_insert(ircomm_tty, (irda_queue_t *) self, line, NULL); |
430 | } | |
431 | /* ++ is not atomic, so this should be protected - Jean II */ | |
e673927d | 432 | spin_lock_irqsave(&self->port.lock, flags); |
580d27b4 | 433 | self->port.count++; |
1da177e4 LT |
434 | |
435 | tty->driver_data = self; | |
e673927d | 436 | spin_unlock_irqrestore(&self->port.lock, flags); |
62f228ac | 437 | tty_port_tty_set(&self->port, tty); |
1da177e4 | 438 | |
0dc47877 | 439 | IRDA_DEBUG(1, "%s(), %s%d, count = %d\n", __func__ , tty->driver->name, |
580d27b4 | 440 | self->line, self->port.count); |
1da177e4 LT |
441 | |
442 | /* Not really used by us, but lets do it anyway */ | |
849d5a99 | 443 | tty->low_latency = (self->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0; |
1da177e4 LT |
444 | |
445 | /* | |
446 | * If the port is the middle of closing, bail out now | |
447 | */ | |
448 | if (tty_hung_up_p(filp) || | |
849d5a99 | 449 | test_bit(ASYNCB_CLOSING, &self->port.flags)) { |
1da177e4 LT |
450 | |
451 | /* Hm, why are we blocking on ASYNC_CLOSING if we | |
452 | * do return -EAGAIN/-ERESTARTSYS below anyway? | |
453 | * IMHO it's either not needed in the first place | |
454 | * or for some reason we need to make sure the async | |
455 | * closing has been finished - if so, wouldn't we | |
456 | * probably better sleep uninterruptible? | |
457 | */ | |
458 | ||
a3cc9fcf | 459 | if (wait_event_interruptible(self->port.close_wait, |
849d5a99 | 460 | !test_bit(ASYNCB_CLOSING, &self->port.flags))) { |
1da177e4 | 461 | IRDA_WARNING("%s - got signal while blocking on ASYNC_CLOSING!\n", |
0dc47877 | 462 | __func__); |
1da177e4 LT |
463 | return -ERESTARTSYS; |
464 | } | |
465 | ||
466 | #ifdef SERIAL_DO_RESTART | |
849d5a99 | 467 | return (self->port.flags & ASYNC_HUP_NOTIFY) ? |
a02cec21 | 468 | -EAGAIN : -ERESTARTSYS; |
1da177e4 LT |
469 | #else |
470 | return -EAGAIN; | |
471 | #endif | |
472 | } | |
473 | ||
474 | /* Check if this is a "normal" ircomm device, or an irlpt device */ | |
475 | if (line < 0x10) { | |
476 | self->service_type = IRCOMM_3_WIRE | IRCOMM_9_WIRE; | |
477 | self->settings.service_type = IRCOMM_9_WIRE; /* 9 wire as default */ | |
478 | /* Jan Kiszka -> add DSR/RI -> Conform to IrCOMM spec */ | |
479 | self->settings.dce = IRCOMM_CTS | IRCOMM_CD | IRCOMM_DSR | IRCOMM_RI; /* Default line settings */ | |
0dc47877 | 480 | IRDA_DEBUG(2, "%s(), IrCOMM device\n", __func__ ); |
1da177e4 | 481 | } else { |
0dc47877 | 482 | IRDA_DEBUG(2, "%s(), IrLPT device\n", __func__ ); |
1da177e4 LT |
483 | self->service_type = IRCOMM_3_WIRE_RAW; |
484 | self->settings.service_type = IRCOMM_3_WIRE_RAW; /* Default */ | |
485 | } | |
486 | ||
487 | ret = ircomm_tty_startup(self); | |
488 | if (ret) | |
489 | return ret; | |
490 | ||
62f228ac | 491 | ret = ircomm_tty_block_til_ready(self, tty, filp); |
1da177e4 | 492 | if (ret) { |
6819bc2e | 493 | IRDA_DEBUG(2, |
0dc47877 | 494 | "%s(), returning after block_til_ready with %d\n", __func__ , |
1da177e4 LT |
495 | ret); |
496 | ||
497 | return ret; | |
498 | } | |
499 | return 0; | |
500 | } | |
501 | ||
502 | /* | |
503 | * Function ircomm_tty_close (tty, filp) | |
504 | * | |
505 | * This routine is called when a particular tty device is closed. | |
506 | * | |
507 | */ | |
508 | static void ircomm_tty_close(struct tty_struct *tty, struct file *filp) | |
509 | { | |
510 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
38c58032 | 511 | struct tty_port *port = &self->port; |
1da177e4 LT |
512 | unsigned long flags; |
513 | ||
0dc47877 | 514 | IRDA_DEBUG(0, "%s()\n", __func__ ); |
1da177e4 | 515 | |
1da177e4 LT |
516 | IRDA_ASSERT(self != NULL, return;); |
517 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
518 | ||
38c58032 | 519 | spin_lock_irqsave(&port->lock, flags); |
1da177e4 LT |
520 | |
521 | if (tty_hung_up_p(filp)) { | |
38c58032 | 522 | spin_unlock_irqrestore(&port->lock, flags); |
1da177e4 | 523 | |
0dc47877 | 524 | IRDA_DEBUG(0, "%s(), returning 1\n", __func__ ); |
1da177e4 LT |
525 | return; |
526 | } | |
527 | ||
38c58032 | 528 | if ((tty->count == 1) && (port->count != 1)) { |
1da177e4 LT |
529 | /* |
530 | * Uh, oh. tty->count is 1, which means that the tty | |
531 | * structure will be freed. state->count should always | |
532 | * be one in these conditions. If it's greater than | |
533 | * one, we've got real problems, since it means the | |
534 | * serial port won't be shutdown. | |
535 | */ | |
536 | IRDA_DEBUG(0, "%s(), bad serial port count; " | |
0dc47877 | 537 | "tty->count is 1, state->count is %d\n", __func__ , |
38c58032 JS |
538 | port->count); |
539 | port->count = 1; | |
1da177e4 LT |
540 | } |
541 | ||
38c58032 | 542 | if (--port->count < 0) { |
1da177e4 | 543 | IRDA_ERROR("%s(), bad serial port count for ttys%d: %d\n", |
38c58032 JS |
544 | __func__, self->line, port->count); |
545 | port->count = 0; | |
1da177e4 | 546 | } |
38c58032 JS |
547 | if (port->count) { |
548 | spin_unlock_irqrestore(&port->lock, flags); | |
1da177e4 | 549 | |
0dc47877 | 550 | IRDA_DEBUG(0, "%s(), open count > 0\n", __func__ ); |
1da177e4 LT |
551 | return; |
552 | } | |
553 | ||
38c58032 | 554 | set_bit(ASYNCB_CLOSING, &port->flags); |
1da177e4 | 555 | |
38c58032 | 556 | spin_unlock_irqrestore(&port->lock, flags); |
1da177e4 LT |
557 | |
558 | /* | |
6819bc2e | 559 | * Now we wait for the transmit buffer to clear; and we notify |
1da177e4 LT |
560 | * the line discipline to only process XON/XOFF characters. |
561 | */ | |
562 | tty->closing = 1; | |
38c58032 JS |
563 | if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE) |
564 | tty_wait_until_sent_from_close(tty, port->closing_wait); | |
1da177e4 LT |
565 | |
566 | ircomm_tty_shutdown(self); | |
567 | ||
f34d7a5b AC |
568 | tty_driver_flush_buffer(tty); |
569 | tty_ldisc_flush(tty); | |
1da177e4 | 570 | |
a1e84403 | 571 | tty_port_close_end(port, tty); |
38c58032 | 572 | tty_port_tty_set(port, NULL); |
1da177e4 LT |
573 | } |
574 | ||
575 | /* | |
576 | * Function ircomm_tty_flush_buffer (tty) | |
577 | * | |
6819bc2e | 578 | * |
1da177e4 LT |
579 | * |
580 | */ | |
581 | static void ircomm_tty_flush_buffer(struct tty_struct *tty) | |
582 | { | |
583 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
584 | ||
585 | IRDA_ASSERT(self != NULL, return;); | |
586 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
587 | ||
6819bc2e YH |
588 | /* |
589 | * Let do_softint() do this to avoid race condition with | |
590 | * do_softint() ;-) | |
1da177e4 LT |
591 | */ |
592 | schedule_work(&self->tqueue); | |
593 | } | |
594 | ||
595 | /* | |
c4028958 | 596 | * Function ircomm_tty_do_softint (work) |
1da177e4 LT |
597 | * |
598 | * We use this routine to give the write wakeup to the user at at a | |
6819bc2e | 599 | * safe time (as fast as possible after write have completed). This |
1da177e4 LT |
600 | * can be compared to the Tx interrupt. |
601 | */ | |
c4028958 | 602 | static void ircomm_tty_do_softint(struct work_struct *work) |
1da177e4 | 603 | { |
c4028958 DH |
604 | struct ircomm_tty_cb *self = |
605 | container_of(work, struct ircomm_tty_cb, tqueue); | |
1da177e4 LT |
606 | struct tty_struct *tty; |
607 | unsigned long flags; | |
608 | struct sk_buff *skb, *ctrl_skb; | |
609 | ||
0dc47877 | 610 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 LT |
611 | |
612 | if (!self || self->magic != IRCOMM_TTY_MAGIC) | |
613 | return; | |
614 | ||
62f228ac | 615 | tty = tty_port_tty_get(&self->port); |
1da177e4 LT |
616 | if (!tty) |
617 | return; | |
618 | ||
619 | /* Unlink control buffer */ | |
620 | spin_lock_irqsave(&self->spinlock, flags); | |
621 | ||
622 | ctrl_skb = self->ctrl_skb; | |
623 | self->ctrl_skb = NULL; | |
624 | ||
625 | spin_unlock_irqrestore(&self->spinlock, flags); | |
626 | ||
627 | /* Flush control buffer if any */ | |
628 | if(ctrl_skb) { | |
629 | if(self->flow == FLOW_START) | |
630 | ircomm_control_request(self->ircomm, ctrl_skb); | |
631 | /* Drop reference count - see ircomm_ttp_data_request(). */ | |
632 | dev_kfree_skb(ctrl_skb); | |
633 | } | |
634 | ||
635 | if (tty->hw_stopped) | |
62f228ac | 636 | goto put; |
1da177e4 LT |
637 | |
638 | /* Unlink transmit buffer */ | |
639 | spin_lock_irqsave(&self->spinlock, flags); | |
6819bc2e | 640 | |
1da177e4 LT |
641 | skb = self->tx_skb; |
642 | self->tx_skb = NULL; | |
643 | ||
644 | spin_unlock_irqrestore(&self->spinlock, flags); | |
645 | ||
646 | /* Flush transmit buffer if any */ | |
647 | if (skb) { | |
648 | ircomm_tty_do_event(self, IRCOMM_TTY_DATA_REQUEST, skb, NULL); | |
649 | /* Drop reference count - see ircomm_ttp_data_request(). */ | |
650 | dev_kfree_skb(skb); | |
651 | } | |
6819bc2e | 652 | |
1da177e4 | 653 | /* Check if user (still) wants to be waken up */ |
a352def2 | 654 | tty_wakeup(tty); |
62f228ac JS |
655 | put: |
656 | tty_kref_put(tty); | |
1da177e4 LT |
657 | } |
658 | ||
659 | /* | |
660 | * Function ircomm_tty_write (tty, buf, count) | |
661 | * | |
662 | * This routine is called by the kernel to write a series of characters | |
663 | * to the tty device. The characters may come from user space or kernel | |
664 | * space. This routine will return the number of characters actually | |
665 | * accepted for writing. This routine is mandatory. | |
666 | */ | |
667 | static int ircomm_tty_write(struct tty_struct *tty, | |
668 | const unsigned char *buf, int count) | |
669 | { | |
670 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
671 | unsigned long flags; | |
672 | struct sk_buff *skb; | |
673 | int tailroom = 0; | |
674 | int len = 0; | |
675 | int size; | |
676 | ||
0dc47877 | 677 | IRDA_DEBUG(2, "%s(), count=%d, hw_stopped=%d\n", __func__ , count, |
1da177e4 LT |
678 | tty->hw_stopped); |
679 | ||
680 | IRDA_ASSERT(self != NULL, return -1;); | |
681 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
682 | ||
683 | /* We may receive packets from the TTY even before we have finished | |
684 | * our setup. Not cool. | |
685 | * The problem is that we don't know the final header and data size | |
686 | * to create the proper skb, so any skb we would create would have | |
687 | * bogus header and data size, so need care. | |
688 | * We use a bogus header size to safely detect this condition. | |
689 | * Another problem is that hw_stopped was set to 0 way before it | |
690 | * should be, so we would drop this skb. It should now be fixed. | |
691 | * One option is to not accept data until we are properly setup. | |
692 | * But, I suspect that when it happens, the ppp line discipline | |
693 | * just "drops" the data, which might screw up connect scripts. | |
694 | * The second option is to create a "safe skb", with large header | |
695 | * and small size (see ircomm_tty_open() for values). | |
696 | * We just need to make sure that when the real values get filled, | |
697 | * we don't mess up the original "safe skb" (see tx_data_size). | |
698 | * Jean II */ | |
699 | if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) { | |
0dc47877 | 700 | IRDA_DEBUG(1, "%s() : not initialised\n", __func__); |
1da177e4 LT |
701 | #ifdef IRCOMM_NO_TX_BEFORE_INIT |
702 | /* We didn't consume anything, TTY will retry */ | |
703 | return 0; | |
704 | #endif | |
705 | } | |
706 | ||
707 | if (count < 1) | |
708 | return 0; | |
709 | ||
710 | /* Protect our manipulation of self->tx_skb and related */ | |
711 | spin_lock_irqsave(&self->spinlock, flags); | |
712 | ||
713 | /* Fetch current transmit buffer */ | |
714 | skb = self->tx_skb; | |
715 | ||
6819bc2e | 716 | /* |
1da177e4 LT |
717 | * Send out all the data we get, possibly as multiple fragmented |
718 | * frames, but this will only happen if the data is larger than the | |
719 | * max data size. The normal case however is just the opposite, and | |
720 | * this function may be called multiple times, and will then actually | |
6819bc2e | 721 | * defragment the data and send it out as one packet as soon as |
1da177e4 LT |
722 | * possible, but at a safer point in time |
723 | */ | |
724 | while (count) { | |
725 | size = count; | |
726 | ||
727 | /* Adjust data size to the max data size */ | |
728 | if (size > self->max_data_size) | |
729 | size = self->max_data_size; | |
6819bc2e YH |
730 | |
731 | /* | |
1da177e4 | 732 | * Do we already have a buffer ready for transmit, or do |
6819bc2e | 733 | * we need to allocate a new frame |
1da177e4 | 734 | */ |
6819bc2e YH |
735 | if (skb) { |
736 | /* | |
737 | * Any room for more data at the end of the current | |
1da177e4 | 738 | * transmit buffer? Cannot use skb_tailroom, since |
6819bc2e | 739 | * dev_alloc_skb gives us a larger skb than we |
1da177e4 LT |
740 | * requested |
741 | * Note : use tx_data_size, because max_data_size | |
742 | * may have changed and we don't want to overwrite | |
743 | * the skb. - Jean II | |
744 | */ | |
745 | if ((tailroom = (self->tx_data_size - skb->len)) > 0) { | |
746 | /* Adjust data to tailroom */ | |
747 | if (size > tailroom) | |
748 | size = tailroom; | |
749 | } else { | |
6819bc2e YH |
750 | /* |
751 | * Current transmit frame is full, so break | |
1da177e4 LT |
752 | * out, so we can send it as soon as possible |
753 | */ | |
754 | break; | |
755 | } | |
756 | } else { | |
757 | /* Prepare a full sized frame */ | |
485fb2c9 SO |
758 | skb = alloc_skb(self->max_data_size+ |
759 | self->max_header_size, | |
760 | GFP_ATOMIC); | |
1da177e4 LT |
761 | if (!skb) { |
762 | spin_unlock_irqrestore(&self->spinlock, flags); | |
763 | return -ENOBUFS; | |
764 | } | |
765 | skb_reserve(skb, self->max_header_size); | |
766 | self->tx_skb = skb; | |
767 | /* Remember skb size because max_data_size may | |
768 | * change later on - Jean II */ | |
769 | self->tx_data_size = self->max_data_size; | |
770 | } | |
771 | ||
772 | /* Copy data */ | |
773 | memcpy(skb_put(skb,size), buf + len, size); | |
774 | ||
775 | count -= size; | |
776 | len += size; | |
777 | } | |
778 | ||
779 | spin_unlock_irqrestore(&self->spinlock, flags); | |
780 | ||
6819bc2e | 781 | /* |
1da177e4 LT |
782 | * Schedule a new thread which will transmit the frame as soon |
783 | * as possible, but at a safe point in time. We do this so the | |
784 | * "user" can give us data multiple times, as PPP does (because of | |
785 | * its 256 byte tx buffer). We will then defragment and send out | |
6819bc2e | 786 | * all this data as one single packet. |
1da177e4 LT |
787 | */ |
788 | schedule_work(&self->tqueue); | |
6819bc2e | 789 | |
1da177e4 LT |
790 | return len; |
791 | } | |
792 | ||
793 | /* | |
794 | * Function ircomm_tty_write_room (tty) | |
795 | * | |
796 | * This routine returns the numbers of characters the tty driver will | |
797 | * accept for queuing to be written. This number is subject to change as | |
798 | * output buffers get emptied, or if the output flow control is acted. | |
799 | */ | |
800 | static int ircomm_tty_write_room(struct tty_struct *tty) | |
801 | { | |
802 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
803 | unsigned long flags; | |
804 | int ret; | |
805 | ||
806 | IRDA_ASSERT(self != NULL, return -1;); | |
807 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
808 | ||
809 | #ifdef IRCOMM_NO_TX_BEFORE_INIT | |
810 | /* max_header_size tells us if the channel is initialised or not. */ | |
811 | if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) | |
812 | /* Don't bother us yet */ | |
813 | return 0; | |
814 | #endif | |
815 | ||
816 | /* Check if we are allowed to transmit any data. | |
817 | * hw_stopped is the regular flow control. | |
818 | * Jean II */ | |
819 | if (tty->hw_stopped) | |
820 | ret = 0; | |
821 | else { | |
822 | spin_lock_irqsave(&self->spinlock, flags); | |
823 | if (self->tx_skb) | |
824 | ret = self->tx_data_size - self->tx_skb->len; | |
825 | else | |
826 | ret = self->max_data_size; | |
827 | spin_unlock_irqrestore(&self->spinlock, flags); | |
828 | } | |
0dc47877 | 829 | IRDA_DEBUG(2, "%s(), ret=%d\n", __func__ , ret); |
1da177e4 LT |
830 | |
831 | return ret; | |
832 | } | |
833 | ||
834 | /* | |
835 | * Function ircomm_tty_wait_until_sent (tty, timeout) | |
836 | * | |
837 | * This routine waits until the device has written out all of the | |
838 | * characters in its transmitter FIFO. | |
839 | */ | |
840 | static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout) | |
841 | { | |
842 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
843 | unsigned long orig_jiffies, poll_time; | |
844 | unsigned long flags; | |
6819bc2e | 845 | |
0dc47877 | 846 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 LT |
847 | |
848 | IRDA_ASSERT(self != NULL, return;); | |
849 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
850 | ||
851 | orig_jiffies = jiffies; | |
852 | ||
853 | /* Set poll time to 200 ms */ | |
854 | poll_time = IRDA_MIN(timeout, msecs_to_jiffies(200)); | |
855 | ||
856 | spin_lock_irqsave(&self->spinlock, flags); | |
857 | while (self->tx_skb && self->tx_skb->len) { | |
858 | spin_unlock_irqrestore(&self->spinlock, flags); | |
121caf57 | 859 | schedule_timeout_interruptible(poll_time); |
1da177e4 LT |
860 | spin_lock_irqsave(&self->spinlock, flags); |
861 | if (signal_pending(current)) | |
862 | break; | |
863 | if (timeout && time_after(jiffies, orig_jiffies + timeout)) | |
864 | break; | |
865 | } | |
866 | spin_unlock_irqrestore(&self->spinlock, flags); | |
867 | current->state = TASK_RUNNING; | |
868 | } | |
869 | ||
870 | /* | |
871 | * Function ircomm_tty_throttle (tty) | |
872 | * | |
873 | * This routine notifies the tty driver that input buffers for the line | |
874 | * discipline are close to full, and it should somehow signal that no | |
6819bc2e | 875 | * more characters should be sent to the tty. |
1da177e4 LT |
876 | */ |
877 | static void ircomm_tty_throttle(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 | /* Software flow control? */ | |
887 | if (I_IXOFF(tty)) | |
888 | ircomm_tty_send_xchar(tty, STOP_CHAR(tty)); | |
6819bc2e | 889 | |
1da177e4 LT |
890 | /* Hardware flow control? */ |
891 | if (tty->termios->c_cflag & CRTSCTS) { | |
892 | self->settings.dte &= ~IRCOMM_RTS; | |
893 | self->settings.dte |= IRCOMM_DELTA_RTS; | |
6819bc2e | 894 | |
1da177e4 LT |
895 | ircomm_param_request(self, IRCOMM_DTE, TRUE); |
896 | } | |
897 | ||
6819bc2e | 898 | ircomm_flow_request(self->ircomm, FLOW_STOP); |
1da177e4 LT |
899 | } |
900 | ||
901 | /* | |
902 | * Function ircomm_tty_unthrottle (tty) | |
903 | * | |
904 | * This routine notifies the tty drivers that it should signals that | |
905 | * characters can now be sent to the tty without fear of overrunning the | |
906 | * input buffers of the line disciplines. | |
907 | */ | |
908 | static void ircomm_tty_unthrottle(struct tty_struct *tty) | |
909 | { | |
910 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
911 | ||
0dc47877 | 912 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
1da177e4 LT |
913 | |
914 | IRDA_ASSERT(self != NULL, return;); | |
915 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
916 | ||
917 | /* Using software flow control? */ | |
918 | if (I_IXOFF(tty)) { | |
919 | ircomm_tty_send_xchar(tty, START_CHAR(tty)); | |
920 | } | |
921 | ||
922 | /* Using hardware flow control? */ | |
923 | if (tty->termios->c_cflag & CRTSCTS) { | |
924 | self->settings.dte |= (IRCOMM_RTS|IRCOMM_DELTA_RTS); | |
925 | ||
926 | ircomm_param_request(self, IRCOMM_DTE, TRUE); | |
0dc47877 | 927 | IRDA_DEBUG(1, "%s(), FLOW_START\n", __func__ ); |
1da177e4 | 928 | } |
6819bc2e | 929 | ircomm_flow_request(self->ircomm, FLOW_START); |
1da177e4 LT |
930 | } |
931 | ||
932 | /* | |
933 | * Function ircomm_tty_chars_in_buffer (tty) | |
934 | * | |
935 | * Indicates if there are any data in the buffer | |
936 | * | |
937 | */ | |
938 | static int ircomm_tty_chars_in_buffer(struct tty_struct *tty) | |
939 | { | |
940 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
941 | unsigned long flags; | |
942 | int len = 0; | |
943 | ||
944 | IRDA_ASSERT(self != NULL, return -1;); | |
945 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
946 | ||
947 | spin_lock_irqsave(&self->spinlock, flags); | |
948 | ||
949 | if (self->tx_skb) | |
950 | len = self->tx_skb->len; | |
951 | ||
952 | spin_unlock_irqrestore(&self->spinlock, flags); | |
953 | ||
954 | return len; | |
955 | } | |
956 | ||
957 | static void ircomm_tty_shutdown(struct ircomm_tty_cb *self) | |
958 | { | |
959 | unsigned long flags; | |
960 | ||
961 | IRDA_ASSERT(self != NULL, return;); | |
962 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
963 | ||
0dc47877 | 964 | IRDA_DEBUG(0, "%s()\n", __func__ ); |
1da177e4 | 965 | |
849d5a99 | 966 | if (!test_and_clear_bit(ASYNCB_INITIALIZED, &self->port.flags)) |
1da177e4 LT |
967 | return; |
968 | ||
969 | ircomm_tty_detach_cable(self); | |
970 | ||
971 | spin_lock_irqsave(&self->spinlock, flags); | |
972 | ||
973 | del_timer(&self->watchdog_timer); | |
6819bc2e | 974 | |
1da177e4 LT |
975 | /* Free parameter buffer */ |
976 | if (self->ctrl_skb) { | |
977 | dev_kfree_skb(self->ctrl_skb); | |
978 | self->ctrl_skb = NULL; | |
979 | } | |
980 | ||
981 | /* Free transmit buffer */ | |
982 | if (self->tx_skb) { | |
983 | dev_kfree_skb(self->tx_skb); | |
984 | self->tx_skb = NULL; | |
985 | } | |
986 | ||
987 | if (self->ircomm) { | |
988 | ircomm_close(self->ircomm); | |
989 | self->ircomm = NULL; | |
990 | } | |
991 | ||
992 | spin_unlock_irqrestore(&self->spinlock, flags); | |
993 | } | |
994 | ||
995 | /* | |
996 | * Function ircomm_tty_hangup (tty) | |
997 | * | |
998 | * This routine notifies the tty driver that it should hangup the tty | |
999 | * device. | |
6819bc2e | 1000 | * |
1da177e4 LT |
1001 | */ |
1002 | static void ircomm_tty_hangup(struct tty_struct *tty) | |
1003 | { | |
1004 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
38c58032 | 1005 | struct tty_port *port = &self->port; |
1da177e4 LT |
1006 | unsigned long flags; |
1007 | ||
0dc47877 | 1008 | IRDA_DEBUG(0, "%s()\n", __func__ ); |
1da177e4 LT |
1009 | |
1010 | IRDA_ASSERT(self != NULL, return;); | |
1011 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
1012 | ||
1da177e4 LT |
1013 | /* ircomm_tty_flush_buffer(tty); */ |
1014 | ircomm_tty_shutdown(self); | |
1015 | ||
38c58032 JS |
1016 | spin_lock_irqsave(&port->lock, flags); |
1017 | port->flags &= ~ASYNC_NORMAL_ACTIVE; | |
1018 | if (port->tty) { | |
1019 | set_bit(TTY_IO_ERROR, &port->tty->flags); | |
1020 | tty_kref_put(port->tty); | |
62f228ac | 1021 | } |
38c58032 JS |
1022 | port->tty = NULL; |
1023 | port->count = 0; | |
1024 | spin_unlock_irqrestore(&port->lock, flags); | |
1da177e4 | 1025 | |
38c58032 | 1026 | wake_up_interruptible(&port->open_wait); |
1da177e4 LT |
1027 | } |
1028 | ||
1029 | /* | |
1030 | * Function ircomm_tty_send_xchar (tty, ch) | |
1031 | * | |
1032 | * This routine is used to send a high-priority XON/XOFF character to | |
1033 | * the device. | |
1034 | */ | |
1035 | static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch) | |
1036 | { | |
0dc47877 | 1037 | IRDA_DEBUG(0, "%s(), not impl\n", __func__ ); |
1da177e4 LT |
1038 | } |
1039 | ||
1040 | /* | |
1041 | * Function ircomm_tty_start (tty) | |
1042 | * | |
1043 | * This routine notifies the tty driver that it resume sending | |
6819bc2e | 1044 | * characters to the tty device. |
1da177e4 LT |
1045 | */ |
1046 | void ircomm_tty_start(struct tty_struct *tty) | |
1047 | { | |
1048 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
1049 | ||
1050 | ircomm_flow_request(self->ircomm, FLOW_START); | |
1051 | } | |
1052 | ||
1053 | /* | |
1054 | * Function ircomm_tty_stop (tty) | |
1055 | * | |
1056 | * This routine notifies the tty driver that it should stop outputting | |
6819bc2e | 1057 | * characters to the tty device. |
1da177e4 | 1058 | */ |
6819bc2e | 1059 | static void ircomm_tty_stop(struct tty_struct *tty) |
1da177e4 LT |
1060 | { |
1061 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; | |
1062 | ||
1063 | IRDA_ASSERT(self != NULL, return;); | |
1064 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
1065 | ||
1066 | ircomm_flow_request(self->ircomm, FLOW_STOP); | |
1067 | } | |
1068 | ||
1069 | /* | |
1070 | * Function ircomm_check_modem_status (self) | |
1071 | * | |
1072 | * Check for any changes in the DCE's line settings. This function should | |
1073 | * be called whenever the dce parameter settings changes, to update the | |
1074 | * flow control settings and other things | |
1075 | */ | |
1076 | void ircomm_tty_check_modem_status(struct ircomm_tty_cb *self) | |
1077 | { | |
1078 | struct tty_struct *tty; | |
1079 | int status; | |
1080 | ||
0dc47877 | 1081 | IRDA_DEBUG(0, "%s()\n", __func__ ); |
1da177e4 LT |
1082 | |
1083 | IRDA_ASSERT(self != NULL, return;); | |
1084 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
1085 | ||
62f228ac | 1086 | tty = tty_port_tty_get(&self->port); |
1da177e4 LT |
1087 | |
1088 | status = self->settings.dce; | |
1089 | ||
1090 | if (status & IRCOMM_DCE_DELTA_ANY) { | |
1091 | /*wake_up_interruptible(&self->delta_msr_wait);*/ | |
1092 | } | |
849d5a99 | 1093 | if ((self->port.flags & ASYNC_CHECK_CD) && (status & IRCOMM_DELTA_CD)) { |
6819bc2e | 1094 | IRDA_DEBUG(2, |
0dc47877 | 1095 | "%s(), ircomm%d CD now %s...\n", __func__ , self->line, |
1da177e4 LT |
1096 | (status & IRCOMM_CD) ? "on" : "off"); |
1097 | ||
1098 | if (status & IRCOMM_CD) { | |
a3cc9fcf | 1099 | wake_up_interruptible(&self->port.open_wait); |
1da177e4 | 1100 | } else { |
6819bc2e | 1101 | IRDA_DEBUG(2, |
0dc47877 | 1102 | "%s(), Doing serial hangup..\n", __func__ ); |
1da177e4 LT |
1103 | if (tty) |
1104 | tty_hangup(tty); | |
1105 | ||
1106 | /* Hangup will remote the tty, so better break out */ | |
62f228ac | 1107 | goto put; |
1da177e4 LT |
1108 | } |
1109 | } | |
62f228ac | 1110 | if (tty && self->port.flags & ASYNC_CTS_FLOW) { |
1da177e4 LT |
1111 | if (tty->hw_stopped) { |
1112 | if (status & IRCOMM_CTS) { | |
6819bc2e | 1113 | IRDA_DEBUG(2, |
0dc47877 | 1114 | "%s(), CTS tx start...\n", __func__ ); |
1da177e4 | 1115 | tty->hw_stopped = 0; |
6819bc2e | 1116 | |
1da177e4 | 1117 | /* Wake up processes blocked on open */ |
a3cc9fcf | 1118 | wake_up_interruptible(&self->port.open_wait); |
1da177e4 LT |
1119 | |
1120 | schedule_work(&self->tqueue); | |
62f228ac | 1121 | goto put; |
1da177e4 LT |
1122 | } |
1123 | } else { | |
1124 | if (!(status & IRCOMM_CTS)) { | |
6819bc2e | 1125 | IRDA_DEBUG(2, |
0dc47877 | 1126 | "%s(), CTS tx stop...\n", __func__ ); |
1da177e4 LT |
1127 | tty->hw_stopped = 1; |
1128 | } | |
1129 | } | |
1130 | } | |
62f228ac JS |
1131 | put: |
1132 | tty_kref_put(tty); | |
1da177e4 LT |
1133 | } |
1134 | ||
1135 | /* | |
1136 | * Function ircomm_tty_data_indication (instance, sap, skb) | |
1137 | * | |
1138 | * Handle incoming data, and deliver it to the line discipline | |
1139 | * | |
1140 | */ | |
1141 | static int ircomm_tty_data_indication(void *instance, void *sap, | |
1142 | struct sk_buff *skb) | |
1143 | { | |
1144 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; | |
62f228ac | 1145 | struct tty_struct *tty; |
1da177e4 | 1146 | |
0dc47877 | 1147 | IRDA_DEBUG(2, "%s()\n", __func__ ); |
6819bc2e | 1148 | |
1da177e4 LT |
1149 | IRDA_ASSERT(self != NULL, return -1;); |
1150 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
1151 | IRDA_ASSERT(skb != NULL, return -1;); | |
1152 | ||
62f228ac JS |
1153 | tty = tty_port_tty_get(&self->port); |
1154 | if (!tty) { | |
0dc47877 | 1155 | IRDA_DEBUG(0, "%s(), no tty!\n", __func__ ); |
1da177e4 LT |
1156 | return 0; |
1157 | } | |
1158 | ||
6819bc2e | 1159 | /* |
1da177e4 LT |
1160 | * If we receive data when hardware is stopped then something is wrong. |
1161 | * We try to poll the peers line settings to check if we are up todate. | |
6819bc2e | 1162 | * Devices like WinCE can do this, and since they don't send any |
1da177e4 LT |
1163 | * params, we can just as well declare the hardware for running. |
1164 | */ | |
62f228ac | 1165 | if (tty->hw_stopped && (self->flow == FLOW_START)) { |
0dc47877 | 1166 | IRDA_DEBUG(0, "%s(), polling for line settings!\n", __func__ ); |
1da177e4 LT |
1167 | ircomm_param_request(self, IRCOMM_POLL, TRUE); |
1168 | ||
1169 | /* We can just as well declare the hardware for running */ | |
1170 | ircomm_tty_send_initial_parameters(self); | |
1171 | ircomm_tty_link_established(self); | |
1172 | } | |
1173 | ||
6819bc2e | 1174 | /* |
cbfd1526 AV |
1175 | * Use flip buffer functions since the code may be called from interrupt |
1176 | * context | |
1da177e4 | 1177 | */ |
62f228ac JS |
1178 | tty_insert_flip_string(tty, skb->data, skb->len); |
1179 | tty_flip_buffer_push(tty); | |
1180 | tty_kref_put(tty); | |
1da177e4 LT |
1181 | |
1182 | /* No need to kfree_skb - see ircomm_ttp_data_indication() */ | |
1183 | ||
1184 | return 0; | |
1185 | } | |
1186 | ||
1187 | /* | |
1188 | * Function ircomm_tty_control_indication (instance, sap, skb) | |
1189 | * | |
1190 | * Parse all incoming parameters (easy!) | |
1191 | * | |
1192 | */ | |
1193 | static int ircomm_tty_control_indication(void *instance, void *sap, | |
1194 | struct sk_buff *skb) | |
1195 | { | |
1196 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; | |
1197 | int clen; | |
1198 | ||
0dc47877 | 1199 | IRDA_DEBUG(4, "%s()\n", __func__ ); |
6819bc2e | 1200 | |
1da177e4 LT |
1201 | IRDA_ASSERT(self != NULL, return -1;); |
1202 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); | |
1203 | IRDA_ASSERT(skb != NULL, return -1;); | |
1204 | ||
1205 | clen = skb->data[0]; | |
1206 | ||
6819bc2e | 1207 | irda_param_extract_all(self, skb->data+1, IRDA_MIN(skb->len-1, clen), |
1da177e4 LT |
1208 | &ircomm_param_info); |
1209 | ||
1210 | /* No need to kfree_skb - see ircomm_control_indication() */ | |
1211 | ||
1212 | return 0; | |
1213 | } | |
1214 | ||
1215 | /* | |
1216 | * Function ircomm_tty_flow_indication (instance, sap, cmd) | |
1217 | * | |
1218 | * This function is called by IrTTP when it wants us to slow down the | |
1219 | * transmission of data. We just mark the hardware as stopped, and wait | |
1220 | * for IrTTP to notify us that things are OK again. | |
1221 | */ | |
6819bc2e | 1222 | static void ircomm_tty_flow_indication(void *instance, void *sap, |
1da177e4 LT |
1223 | LOCAL_FLOW cmd) |
1224 | { | |
1225 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; | |
1226 | struct tty_struct *tty; | |
1227 | ||
1228 | IRDA_ASSERT(self != NULL, return;); | |
1229 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); | |
1230 | ||
62f228ac | 1231 | tty = tty_port_tty_get(&self->port); |
1da177e4 LT |
1232 | |
1233 | switch (cmd) { | |
1234 | case FLOW_START: | |
0dc47877 | 1235 | IRDA_DEBUG(2, "%s(), hw start!\n", __func__ ); |
62f228ac JS |
1236 | if (tty) |
1237 | tty->hw_stopped = 0; | |
1da177e4 LT |
1238 | |
1239 | /* ircomm_tty_do_softint will take care of the rest */ | |
1240 | schedule_work(&self->tqueue); | |
1241 | break; | |
1242 | default: /* If we get here, something is very wrong, better stop */ | |
1243 | case FLOW_STOP: | |
0dc47877 | 1244 | IRDA_DEBUG(2, "%s(), hw stopped!\n", __func__ ); |
62f228ac JS |
1245 | if (tty) |
1246 | tty->hw_stopped = 1; | |
1da177e4 LT |
1247 | break; |
1248 | } | |
62f228ac JS |
1249 | |
1250 | tty_kref_put(tty); | |
1da177e4 LT |
1251 | self->flow = cmd; |
1252 | } | |
1253 | ||
92b05e13 | 1254 | #ifdef CONFIG_PROC_FS |
3d304176 | 1255 | static void ircomm_tty_line_info(struct ircomm_tty_cb *self, struct seq_file *m) |
1da177e4 | 1256 | { |
62f228ac | 1257 | struct tty_struct *tty; |
3d304176 | 1258 | char sep; |
1da177e4 | 1259 | |
3d304176 | 1260 | seq_printf(m, "State: %s\n", ircomm_tty_state[self->state]); |
1da177e4 | 1261 | |
3d304176 | 1262 | seq_puts(m, "Service type: "); |
1da177e4 | 1263 | if (self->service_type & IRCOMM_9_WIRE) |
3d304176 | 1264 | seq_puts(m, "9_WIRE"); |
1da177e4 | 1265 | else if (self->service_type & IRCOMM_3_WIRE) |
3d304176 | 1266 | seq_puts(m, "3_WIRE"); |
1da177e4 | 1267 | else if (self->service_type & IRCOMM_3_WIRE_RAW) |
3d304176 | 1268 | seq_puts(m, "3_WIRE_RAW"); |
1da177e4 | 1269 | else |
3d304176 AD |
1270 | seq_puts(m, "No common service type!\n"); |
1271 | seq_putc(m, '\n'); | |
1272 | ||
1273 | seq_printf(m, "Port name: %s\n", self->settings.port_name); | |
1274 | ||
1275 | seq_printf(m, "DTE status:"); | |
1276 | sep = ' '; | |
1277 | if (self->settings.dte & IRCOMM_RTS) { | |
1278 | seq_printf(m, "%cRTS", sep); | |
1279 | sep = '|'; | |
1280 | } | |
1281 | if (self->settings.dte & IRCOMM_DTR) { | |
1282 | seq_printf(m, "%cDTR", sep); | |
1283 | sep = '|'; | |
1284 | } | |
1285 | seq_putc(m, '\n'); | |
1286 | ||
1287 | seq_puts(m, "DCE status:"); | |
1288 | sep = ' '; | |
1289 | if (self->settings.dce & IRCOMM_CTS) { | |
1290 | seq_printf(m, "%cCTS", sep); | |
1291 | sep = '|'; | |
1292 | } | |
1293 | if (self->settings.dce & IRCOMM_DSR) { | |
1294 | seq_printf(m, "%cDSR", sep); | |
1295 | sep = '|'; | |
1296 | } | |
1297 | if (self->settings.dce & IRCOMM_CD) { | |
1298 | seq_printf(m, "%cCD", sep); | |
1299 | sep = '|'; | |
1300 | } | |
1301 | if (self->settings.dce & IRCOMM_RI) { | |
1302 | seq_printf(m, "%cRI", sep); | |
1303 | sep = '|'; | |
1304 | } | |
1305 | seq_putc(m, '\n'); | |
1306 | ||
1307 | seq_puts(m, "Configuration: "); | |
1da177e4 | 1308 | if (!self->settings.null_modem) |
3d304176 | 1309 | seq_puts(m, "DTE <-> DCE\n"); |
1da177e4 | 1310 | else |
3d304176 AD |
1311 | seq_puts(m, "DTE <-> DTE (null modem emulation)\n"); |
1312 | ||
1313 | seq_printf(m, "Data rate: %d\n", self->settings.data_rate); | |
1314 | ||
1315 | seq_puts(m, "Flow control:"); | |
1316 | sep = ' '; | |
1317 | if (self->settings.flow_control & IRCOMM_XON_XOFF_IN) { | |
1318 | seq_printf(m, "%cXON_XOFF_IN", sep); | |
1319 | sep = '|'; | |
1320 | } | |
1321 | if (self->settings.flow_control & IRCOMM_XON_XOFF_OUT) { | |
1322 | seq_printf(m, "%cXON_XOFF_OUT", sep); | |
1323 | sep = '|'; | |
1324 | } | |
1325 | if (self->settings.flow_control & IRCOMM_RTS_CTS_IN) { | |
1326 | seq_printf(m, "%cRTS_CTS_IN", sep); | |
1327 | sep = '|'; | |
1328 | } | |
1329 | if (self->settings.flow_control & IRCOMM_RTS_CTS_OUT) { | |
1330 | seq_printf(m, "%cRTS_CTS_OUT", sep); | |
1331 | sep = '|'; | |
1332 | } | |
1333 | if (self->settings.flow_control & IRCOMM_DSR_DTR_IN) { | |
1334 | seq_printf(m, "%cDSR_DTR_IN", sep); | |
1335 | sep = '|'; | |
1336 | } | |
1337 | if (self->settings.flow_control & IRCOMM_DSR_DTR_OUT) { | |
1338 | seq_printf(m, "%cDSR_DTR_OUT", sep); | |
1339 | sep = '|'; | |
1340 | } | |
1341 | if (self->settings.flow_control & IRCOMM_ENQ_ACK_IN) { | |
1342 | seq_printf(m, "%cENQ_ACK_IN", sep); | |
1343 | sep = '|'; | |
1344 | } | |
1345 | if (self->settings.flow_control & IRCOMM_ENQ_ACK_OUT) { | |
1346 | seq_printf(m, "%cENQ_ACK_OUT", sep); | |
1347 | sep = '|'; | |
1348 | } | |
1349 | seq_putc(m, '\n'); | |
1350 | ||
1351 | seq_puts(m, "Flags:"); | |
1352 | sep = ' '; | |
849d5a99 | 1353 | if (self->port.flags & ASYNC_CTS_FLOW) { |
3d304176 AD |
1354 | seq_printf(m, "%cASYNC_CTS_FLOW", sep); |
1355 | sep = '|'; | |
1356 | } | |
849d5a99 | 1357 | if (self->port.flags & ASYNC_CHECK_CD) { |
3d304176 AD |
1358 | seq_printf(m, "%cASYNC_CHECK_CD", sep); |
1359 | sep = '|'; | |
1360 | } | |
849d5a99 | 1361 | if (self->port.flags & ASYNC_INITIALIZED) { |
3d304176 AD |
1362 | seq_printf(m, "%cASYNC_INITIALIZED", sep); |
1363 | sep = '|'; | |
1364 | } | |
849d5a99 | 1365 | if (self->port.flags & ASYNC_LOW_LATENCY) { |
3d304176 AD |
1366 | seq_printf(m, "%cASYNC_LOW_LATENCY", sep); |
1367 | sep = '|'; | |
1368 | } | |
849d5a99 | 1369 | if (self->port.flags & ASYNC_CLOSING) { |
3d304176 AD |
1370 | seq_printf(m, "%cASYNC_CLOSING", sep); |
1371 | sep = '|'; | |
1372 | } | |
849d5a99 | 1373 | if (self->port.flags & ASYNC_NORMAL_ACTIVE) { |
3d304176 AD |
1374 | seq_printf(m, "%cASYNC_NORMAL_ACTIVE", sep); |
1375 | sep = '|'; | |
1376 | } | |
1377 | seq_putc(m, '\n'); | |
1378 | ||
1379 | seq_printf(m, "Role: %s\n", self->client ? "client" : "server"); | |
580d27b4 | 1380 | seq_printf(m, "Open count: %d\n", self->port.count); |
3d304176 AD |
1381 | seq_printf(m, "Max data size: %d\n", self->max_data_size); |
1382 | seq_printf(m, "Max header size: %d\n", self->max_header_size); | |
6819bc2e | 1383 | |
62f228ac JS |
1384 | tty = tty_port_tty_get(&self->port); |
1385 | if (tty) { | |
3d304176 | 1386 | seq_printf(m, "Hardware: %s\n", |
62f228ac JS |
1387 | tty->hw_stopped ? "Stopped" : "Running"); |
1388 | tty_kref_put(tty); | |
1389 | } | |
1da177e4 LT |
1390 | } |
1391 | ||
3d304176 | 1392 | static int ircomm_tty_proc_show(struct seq_file *m, void *v) |
1da177e4 LT |
1393 | { |
1394 | struct ircomm_tty_cb *self; | |
1da177e4 LT |
1395 | unsigned long flags; |
1396 | ||
1397 | spin_lock_irqsave(&ircomm_tty->hb_spinlock, flags); | |
1398 | ||
1399 | self = (struct ircomm_tty_cb *) hashbin_get_first(ircomm_tty); | |
3d304176 | 1400 | while (self != NULL) { |
1da177e4 LT |
1401 | if (self->magic != IRCOMM_TTY_MAGIC) |
1402 | break; | |
1403 | ||
3d304176 | 1404 | ircomm_tty_line_info(self, m); |
1da177e4 | 1405 | self = (struct ircomm_tty_cb *) hashbin_get_next(ircomm_tty); |
6819bc2e | 1406 | } |
1da177e4 | 1407 | spin_unlock_irqrestore(&ircomm_tty->hb_spinlock, flags); |
3d304176 AD |
1408 | return 0; |
1409 | } | |
1da177e4 | 1410 | |
3d304176 AD |
1411 | static int ircomm_tty_proc_open(struct inode *inode, struct file *file) |
1412 | { | |
1413 | return single_open(file, ircomm_tty_proc_show, NULL); | |
1da177e4 | 1414 | } |
3d304176 AD |
1415 | |
1416 | static const struct file_operations ircomm_tty_proc_fops = { | |
1417 | .owner = THIS_MODULE, | |
1418 | .open = ircomm_tty_proc_open, | |
1419 | .read = seq_read, | |
1420 | .llseek = seq_lseek, | |
1421 | .release = single_release, | |
1422 | }; | |
1da177e4 LT |
1423 | #endif /* CONFIG_PROC_FS */ |
1424 | ||
1425 | MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>"); | |
1426 | MODULE_DESCRIPTION("IrCOMM serial TTY driver"); | |
1427 | MODULE_LICENSE("GPL"); | |
1428 | MODULE_ALIAS_CHARDEV_MAJOR(IRCOMM_TTY_MAJOR); | |
1429 | ||
1430 | module_init(ircomm_tty_init); | |
1431 | module_exit(ircomm_tty_cleanup); |