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