1 /*
2 * interface to user space for the gigaset driver
3 *
4 * Copyright (c) 2004 by Hansjoerg Lipp <hjlipp@web.de>
5 *
6 * =====================================================================
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; either version 2 of
10 * the License, or (at your option) any later version.
11 * =====================================================================
12 */
13
14 #include "gigaset.h"
15 #include <linux/gigaset_dev.h>
16 #include <linux/tty.h>
17 #include <linux/tty_flip.h>
18
19 /*** our ioctls ***/
20
21 static int if_lock(struct cardstate *cs, int *arg)
22 {
23 int cmd = *arg;
24
25 gig_dbg(DEBUG_IF, "%u: if_lock (%d)", cs->minor_index, cmd);
26
27 if (cmd > 1)
28 return -EINVAL;
29
30 if (cmd < 0) {
31 *arg = cs->mstate == MS_LOCKED;
32 return 0;
33 }
34
35 if (!cmd && cs->mstate == MS_LOCKED && cs->connected) {
36 cs->ops->set_modem_ctrl(cs, 0, TIOCM_DTR|TIOCM_RTS);
37 cs->ops->baud_rate(cs, B115200);
38 cs->ops->set_line_ctrl(cs, CS8);
39 cs->control_state = TIOCM_DTR|TIOCM_RTS;
40 }
41
42 cs->waiting = 1;
43 if (!gigaset_add_event(cs, &cs->at_state, EV_IF_LOCK,
44 NULL, cmd, NULL)) {
45 cs->waiting = 0;
46 return -ENOMEM;
47 }
48
49 gig_dbg(DEBUG_CMD, "scheduling IF_LOCK");
50 gigaset_schedule_event(cs);
51
52 wait_event(cs->waitqueue, !cs->waiting);
53
54 if (cs->cmd_result >= 0) {
55 *arg = cs->cmd_result;
56 return 0;
57 }
58
59 return cs->cmd_result;
60 }
61
62 static int if_version(struct cardstate *cs, unsigned arg[4])
63 {
64 static const unsigned version[4] = GIG_VERSION;
65 static const unsigned compat[4] = GIG_COMPAT;
66 unsigned cmd = arg[0];
67
68 gig_dbg(DEBUG_IF, "%u: if_version (%d)", cs->minor_index, cmd);
69
70 switch (cmd) {
71 case GIGVER_DRIVER:
72 memcpy(arg, version, sizeof version);
73 return 0;
74 case GIGVER_COMPAT:
75 memcpy(arg, compat, sizeof compat);
76 return 0;
77 case GIGVER_FWBASE:
78 cs->waiting = 1;
79 if (!gigaset_add_event(cs, &cs->at_state, EV_IF_VER,
80 NULL, 0, arg)) {
81 cs->waiting = 0;
82 return -ENOMEM;
83 }
84
85 gig_dbg(DEBUG_CMD, "scheduling IF_VER");
86 gigaset_schedule_event(cs);
87
88 wait_event(cs->waitqueue, !cs->waiting);
89
90 if (cs->cmd_result >= 0)
91 return 0;
92
93 return cs->cmd_result;
94 default:
95 return -EINVAL;
96 }
97 }
98
99 static int if_config(struct cardstate *cs, int *arg)
100 {
101 gig_dbg(DEBUG_IF, "%u: if_config (%d)", cs->minor_index, *arg);
102
103 if (*arg != 1)
104 return -EINVAL;
105
106 if (cs->mstate != MS_LOCKED)
107 return -EBUSY;
108
109 if (!cs->connected) {
110 err("not connected!");
111 return -ENODEV;
112 }
113
114 *arg = 0;
115 return gigaset_enterconfigmode(cs);
116 }
117
118 /*** the terminal driver ***/
119 /* stolen from usbserial and some other tty drivers */
120
121 static int if_open(struct tty_struct *tty, struct file *filp);
122 static void if_close(struct tty_struct *tty, struct file *filp);
123 static int if_ioctl(struct tty_struct *tty, struct file *file,
124 unsigned int cmd, unsigned long arg);
125 static int if_write_room(struct tty_struct *tty);
126 static int if_chars_in_buffer(struct tty_struct *tty);
127 static void if_throttle(struct tty_struct *tty);
128 static void if_unthrottle(struct tty_struct *tty);
129 static void if_set_termios(struct tty_struct *tty, struct ktermios *old);
130 static int if_tiocmget(struct tty_struct *tty, struct file *file);
131 static int if_tiocmset(struct tty_struct *tty, struct file *file,
132 unsigned int set, unsigned int clear);
133 static int if_write(struct tty_struct *tty,
134 const unsigned char *buf, int count);
135
136 static const struct tty_operations if_ops = {
137 .open = if_open,
138 .close = if_close,
139 .ioctl = if_ioctl,
140 .write = if_write,
141 .write_room = if_write_room,
142 .chars_in_buffer = if_chars_in_buffer,
143 .set_termios = if_set_termios,
144 .throttle = if_throttle,
145 .unthrottle = if_unthrottle,
146 #if 0
147 .break_ctl = serial_break,
148 #endif
149 .tiocmget = if_tiocmget,
150 .tiocmset = if_tiocmset,
151 };
152
153 static int if_open(struct tty_struct *tty, struct file *filp)
154 {
155 struct cardstate *cs;
156 unsigned long flags;
157
158 gig_dbg(DEBUG_IF, "%d+%d: %s()",
159 tty->driver->minor_start, tty->index, __func__);
160
161 tty->driver_data = NULL;
162
163 cs = gigaset_get_cs_by_tty(tty);
164 if (!cs || !try_module_get(cs->driver->owner))
165 return -ENODEV;
166
167 if (mutex_lock_interruptible(&cs->mutex))
168 return -ERESTARTSYS; // FIXME -EINTR?
169 tty->driver_data = cs;
170
171 ++cs->open_count;
172
173 if (cs->open_count == 1) {
174 spin_lock_irqsave(&cs->lock, flags);
175 cs->tty = tty;
176 spin_unlock_irqrestore(&cs->lock, flags);
177 tty->low_latency = 1; //FIXME test
178 }
179
180 mutex_unlock(&cs->mutex);
181 return 0;
182 }
183
184 static void if_close(struct tty_struct *tty, struct file *filp)
185 {
186 struct cardstate *cs;
187 unsigned long flags;
188
189 cs = (struct cardstate *) tty->driver_data;
190 if (!cs) {
191 err("cs==NULL in %s", __func__);
192 return;
193 }
194
195 gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
196
197 mutex_lock(&cs->mutex);
198
199 if (!cs->open_count)
200 warn("%s: device not opened", __func__);
201 else {
202 if (!--cs->open_count) {
203 spin_lock_irqsave(&cs->lock, flags);
204 cs->tty = NULL;
205 spin_unlock_irqrestore(&cs->lock, flags);
206 }
207 }
208
209 mutex_unlock(&cs->mutex);
210
211 module_put(cs->driver->owner);
212 }
213
214 static int if_ioctl(struct tty_struct *tty, struct file *file,
215 unsigned int cmd, unsigned long arg)
216 {
217 struct cardstate *cs;
218 int retval = -ENODEV;
219 int int_arg;
220 unsigned char buf[6];
221 unsigned version[4];
222
223 cs = (struct cardstate *) tty->driver_data;
224 if (!cs) {
225 err("cs==NULL in %s", __func__);
226 return -ENODEV;
227 }
228
229 gig_dbg(DEBUG_IF, "%u: %s(0x%x)", cs->minor_index, __func__, cmd);
230
231 if (mutex_lock_interruptible(&cs->mutex))
232 return -ERESTARTSYS; // FIXME -EINTR?
233
234 if (!cs->open_count)
235 warn("%s: device not opened", __func__);
236 else {
237 retval = 0;
238 switch (cmd) {
239 case GIGASET_REDIR:
240 retval = get_user(int_arg, (int __user *) arg);
241 if (retval >= 0)
242 retval = if_lock(cs, &int_arg);
243 if (retval >= 0)
244 retval = put_user(int_arg, (int __user *) arg);
245 break;
246 case GIGASET_CONFIG:
247 retval = get_user(int_arg, (int __user *) arg);
248 if (retval >= 0)
249 retval = if_config(cs, &int_arg);
250 if (retval >= 0)
251 retval = put_user(int_arg, (int __user *) arg);
252 break;
253 case GIGASET_BRKCHARS:
254 //FIXME test if MS_LOCKED
255 if (!cs->connected) {
256 gig_dbg(DEBUG_ANY,
257 "can't communicate with unplugged device");
258 retval = -ENODEV;
259 break;
260 }
261 retval = copy_from_user(&buf,
262 (const unsigned char __user *) arg, 6)
263 ? -EFAULT : 0;
264 if (retval >= 0) {
265 gigaset_dbg_buffer(DEBUG_IF, "GIGASET_BRKCHARS",
266 6, (const unsigned char *) arg);
267 retval = cs->ops->brkchars(cs, buf);
268 }
269 break;
270 case GIGASET_VERSION:
271 retval = copy_from_user(version,
272 (unsigned __user *) arg, sizeof version)
273 ? -EFAULT : 0;
274 if (retval >= 0)
275 retval = if_version(cs, version);
276 if (retval >= 0)
277 retval = copy_to_user((unsigned __user *) arg,
278 version, sizeof version)
279 ? -EFAULT : 0;
280 break;
281 default:
282 gig_dbg(DEBUG_ANY, "%s: arg not supported - 0x%04x",
283 __func__, cmd);
284 retval = -ENOIOCTLCMD;
285 }
286 }
287
288 mutex_unlock(&cs->mutex);
289
290 return retval;
291 }
292
293 static int if_tiocmget(struct tty_struct *tty, struct file *file)
294 {
295 struct cardstate *cs;
296 int retval;
297
298 cs = (struct cardstate *) tty->driver_data;
299 if (!cs) {
300 err("cs==NULL in %s", __func__);
301 return -ENODEV;
302 }
303
304 gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
305
306 if (mutex_lock_interruptible(&cs->mutex))
307 return -ERESTARTSYS; // FIXME -EINTR?
308
309 // FIXME read from device?
310 retval = cs->control_state & (TIOCM_RTS|TIOCM_DTR);
311
312 mutex_unlock(&cs->mutex);
313
314 return retval;
315 }
316
317 static int if_tiocmset(struct tty_struct *tty, struct file *file,
318 unsigned int set, unsigned int clear)
319 {
320 struct cardstate *cs;
321 int retval;
322 unsigned mc;
323
324 cs = (struct cardstate *) tty->driver_data;
325 if (!cs) {
326 err("cs==NULL in %s", __func__);
327 return -ENODEV;
328 }
329
330 gig_dbg(DEBUG_IF, "%u: %s(0x%x, 0x%x)",
331 cs->minor_index, __func__, set, clear);
332
333 if (mutex_lock_interruptible(&cs->mutex))
334 return -ERESTARTSYS; // FIXME -EINTR?
335
336 if (!cs->connected) {
337 gig_dbg(DEBUG_ANY, "can't communicate with unplugged device");
338 retval = -ENODEV;
339 } else {
340 mc = (cs->control_state | set) & ~clear & (TIOCM_RTS|TIOCM_DTR);
341 retval = cs->ops->set_modem_ctrl(cs, cs->control_state, mc);
342 cs->control_state = mc;
343 }
344
345 mutex_unlock(&cs->mutex);
346
347 return retval;
348 }
349
350 static int if_write(struct tty_struct *tty, const unsigned char *buf, int count)
351 {
352 struct cardstate *cs;
353 int retval = -ENODEV;
354
355 cs = (struct cardstate *) tty->driver_data;
356 if (!cs) {
357 err("cs==NULL in %s", __func__);
358 return -ENODEV;
359 }
360
361 gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
362
363 if (mutex_lock_interruptible(&cs->mutex))
364 return -ERESTARTSYS; // FIXME -EINTR?
365
366 if (!cs->open_count)
367 warn("%s: device not opened", __func__);
368 else if (cs->mstate != MS_LOCKED) {
369 warn("can't write to unlocked device");
370 retval = -EBUSY;
371 } else if (!cs->connected) {
372 gig_dbg(DEBUG_ANY, "can't write to unplugged device");
373 retval = -EBUSY; //FIXME
374 } else {
375 retval = cs->ops->write_cmd(cs, buf, count,
376 &cs->if_wake_tasklet);
377 }
378
379 mutex_unlock(&cs->mutex);
380
381 return retval;
382 }
383
384 static int if_write_room(struct tty_struct *tty)
385 {
386 struct cardstate *cs;
387 int retval = -ENODEV;
388
389 cs = (struct cardstate *) tty->driver_data;
390 if (!cs) {
391 err("cs==NULL in %s", __func__);
392 return -ENODEV;
393 }
394
395 gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
396
397 if (mutex_lock_interruptible(&cs->mutex))
398 return -ERESTARTSYS; // FIXME -EINTR?
399
400 if (!cs->open_count)
401 warn("%s: device not opened", __func__);
402 else if (cs->mstate != MS_LOCKED) {
403 warn("can't write to unlocked device");
404 retval = -EBUSY;
405 } else if (!cs->connected) {
406 gig_dbg(DEBUG_ANY, "can't write to unplugged device");
407 retval = -EBUSY; //FIXME
408 } else
409 retval = cs->ops->write_room(cs);
410
411 mutex_unlock(&cs->mutex);
412
413 return retval;
414 }
415
416 static int if_chars_in_buffer(struct tty_struct *tty)
417 {
418 struct cardstate *cs;
419 int retval = -ENODEV;
420
421 cs = (struct cardstate *) tty->driver_data;
422 if (!cs) {
423 err("cs==NULL in %s", __func__);
424 return -ENODEV;
425 }
426
427 gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
428
429 if (mutex_lock_interruptible(&cs->mutex))
430 return -ERESTARTSYS; // FIXME -EINTR?
431
432 if (!cs->open_count)
433 warn("%s: device not opened", __func__);
434 else if (cs->mstate != MS_LOCKED) {
435 warn("can't write to unlocked device");
436 retval = -EBUSY;
437 } else if (!cs->connected) {
438 gig_dbg(DEBUG_ANY, "can't write to unplugged device");
439 retval = -EBUSY; //FIXME
440 } else
441 retval = cs->ops->chars_in_buffer(cs);
442
443 mutex_unlock(&cs->mutex);
444
445 return retval;
446 }
447
448 static void if_throttle(struct tty_struct *tty)
449 {
450 struct cardstate *cs;
451
452 cs = (struct cardstate *) tty->driver_data;
453 if (!cs) {
454 err("cs==NULL in %s", __func__);
455 return;
456 }
457
458 gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
459
460 mutex_lock(&cs->mutex);
461
462 if (!cs->open_count)
463 warn("%s: device not opened", __func__);
464 else {
465 //FIXME
466 }
467
468 mutex_unlock(&cs->mutex);
469 }
470
471 static void if_unthrottle(struct tty_struct *tty)
472 {
473 struct cardstate *cs;
474
475 cs = (struct cardstate *) tty->driver_data;
476 if (!cs) {
477 err("cs==NULL in %s", __func__);
478 return;
479 }
480
481 gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
482
483 mutex_lock(&cs->mutex);
484
485 if (!cs->open_count)
486 warn("%s: device not opened", __func__);
487 else {
488 //FIXME
489 }
490
491 mutex_unlock(&cs->mutex);
492 }
493
494 static void if_set_termios(struct tty_struct *tty, struct ktermios *old)
495 {
496 struct cardstate *cs;
497 unsigned int iflag;
498 unsigned int cflag;
499 unsigned int old_cflag;
500 unsigned int control_state, new_state;
501
502 cs = (struct cardstate *) tty->driver_data;
503 if (!cs) {
504 err("cs==NULL in %s", __func__);
505 return;
506 }
507
508 gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
509
510 mutex_lock(&cs->mutex);
511
512 if (!cs->open_count) {
513 warn("%s: device not opened", __func__);
514 goto out;
515 }
516
517 if (!cs->connected) {
518 gig_dbg(DEBUG_ANY, "can't communicate with unplugged device");
519 goto out;
520 }
521
522 // stolen from mct_u232.c
523 iflag = tty->termios->c_iflag;
524 cflag = tty->termios->c_cflag;
525 old_cflag = old ? old->c_cflag : cflag; //FIXME?
526 gig_dbg(DEBUG_IF, "%u: iflag %x cflag %x old %x",
527 cs->minor_index, iflag, cflag, old_cflag);
528
529 /* get a local copy of the current port settings */
530 control_state = cs->control_state;
531
532 /*
533 * Update baud rate.
534 * Do not attempt to cache old rates and skip settings,
535 * disconnects screw such tricks up completely.
536 * Premature optimization is the root of all evil.
537 */
538
539 /* reassert DTR and (maybe) RTS on transition from B0 */
540 if ((old_cflag & CBAUD) == B0) {
541 new_state = control_state | TIOCM_DTR;
542 /* don't set RTS if using hardware flow control */
543 if (!(old_cflag & CRTSCTS))
544 new_state |= TIOCM_RTS;
545 gig_dbg(DEBUG_IF, "%u: from B0 - set DTR%s",
546 cs->minor_index,
547 (new_state & TIOCM_RTS) ? " only" : "/RTS");
548 cs->ops->set_modem_ctrl(cs, control_state, new_state);
549 control_state = new_state;
550 }
551
552 cs->ops->baud_rate(cs, cflag & CBAUD);
553
554 if ((cflag & CBAUD) == B0) {
555 /* Drop RTS and DTR */
556 gig_dbg(DEBUG_IF, "%u: to B0 - drop DTR/RTS", cs->minor_index);
557 new_state = control_state & ~(TIOCM_DTR | TIOCM_RTS);
558 cs->ops->set_modem_ctrl(cs, control_state, new_state);
559 control_state = new_state;
560 }
561
562 /*
563 * Update line control register (LCR)
564 */
565
566 cs->ops->set_line_ctrl(cs, cflag);
567
568 #if 0
569 //FIXME this hangs M101 [ts 2005-03-09]
570 //FIXME do we need this?
571 /*
572 * Set flow control: well, I do not really now how to handle DTR/RTS.
573 * Just do what we have seen with SniffUSB on Win98.
574 */
575 /* Drop DTR/RTS if no flow control otherwise assert */
576 gig_dbg(DEBUG_IF, "%u: control_state %x",
577 cs->minor_index, control_state);
578 new_state = control_state;
579 if ((iflag & IXOFF) || (iflag & IXON) || (cflag & CRTSCTS))
580 new_state |= TIOCM_DTR | TIOCM_RTS;
581 else
582 new_state &= ~(TIOCM_DTR | TIOCM_RTS);
583 if (new_state != control_state) {
584 gig_dbg(DEBUG_IF, "%u: new_state %x",
585 cs->minor_index, new_state);
586 gigaset_set_modem_ctrl(cs, control_state, new_state);
587 control_state = new_state;
588 }
589 #endif
590
591 /* save off the modified port settings */
592 cs->control_state = control_state;
593
594 out:
595 mutex_unlock(&cs->mutex);
596 }
597
598
599 /* wakeup tasklet for the write operation */
600 static void if_wake(unsigned long data)
601 {
602 struct cardstate *cs = (struct cardstate *) data;
603
604 if (cs->tty)
605 tty_wakeup(cs->tty);
606 }
607
608 /*** interface to common ***/
609
610 void gigaset_if_init(struct cardstate *cs)
611 {
612 struct gigaset_driver *drv;
613
614 drv = cs->driver;
615 if (!drv->have_tty)
616 return;
617
618 tasklet_init(&cs->if_wake_tasklet, &if_wake, (unsigned long) cs);
619
620 mutex_lock(&cs->mutex);
621 cs->tty_dev = tty_register_device(drv->tty, cs->minor_index, NULL);
622
623 if (!IS_ERR(cs->tty_dev))
624 dev_set_drvdata(cs->tty_dev, cs);
625 else {
626 warn("could not register device to the tty subsystem");
627 cs->tty_dev = NULL;
628 }
629 mutex_unlock(&cs->mutex);
630 }
631
632 void gigaset_if_free(struct cardstate *cs)
633 {
634 struct gigaset_driver *drv;
635
636 drv = cs->driver;
637 if (!drv->have_tty)
638 return;
639
640 tasklet_disable(&cs->if_wake_tasklet);
641 tasklet_kill(&cs->if_wake_tasklet);
642 cs->tty_dev = NULL;
643 tty_unregister_device(drv->tty, cs->minor_index);
644 }
645
646 void gigaset_if_receive(struct cardstate *cs,
647 unsigned char *buffer, size_t len)
648 {
649 unsigned long flags;
650 struct tty_struct *tty;
651
652 spin_lock_irqsave(&cs->lock, flags);
653 if ((tty = cs->tty) == NULL)
654 gig_dbg(DEBUG_ANY, "receive on closed device");
655 else {
656 tty_buffer_request_room(tty, len);
657 tty_insert_flip_string(tty, buffer, len);
658 tty_flip_buffer_push(tty);
659 }
660 spin_unlock_irqrestore(&cs->lock, flags);
661 }
662 EXPORT_SYMBOL_GPL(gigaset_if_receive);
663
664 /* gigaset_if_initdriver
665 * Initialize tty interface.
666 * parameters:
667 * drv Driver
668 * procname Name of the driver (e.g. for /proc/tty/drivers)
669 * devname Name of the device files (prefix without minor number)
670 */
671 void gigaset_if_initdriver(struct gigaset_driver *drv, const char *procname,
672 const char *devname)
673 {
674 unsigned minors = drv->minors;
675 int ret;
676 struct tty_driver *tty;
677
678 drv->have_tty = 0;
679
680 if ((drv->tty = alloc_tty_driver(minors)) == NULL)
681 goto enomem;
682 tty = drv->tty;
683
684 tty->magic = TTY_DRIVER_MAGIC,
685 tty->major = GIG_MAJOR,
686 tty->type = TTY_DRIVER_TYPE_SERIAL,
687 tty->subtype = SERIAL_TYPE_NORMAL,
688 tty->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
689
690 tty->driver_name = procname;
691 tty->name = devname;
692 tty->minor_start = drv->minor;
693 tty->num = drv->minors;
694
695 tty->owner = THIS_MODULE;
696
697 tty->init_termios = tty_std_termios; //FIXME
698 tty->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; //FIXME
699 tty_set_operations(tty, &if_ops);
700
701 ret = tty_register_driver(tty);
702 if (ret < 0) {
703 warn("failed to register tty driver (error %d)", ret);
704 goto error;
705 }
706 gig_dbg(DEBUG_IF, "tty driver initialized");
707 drv->have_tty = 1;
708 return;
709
710 enomem:
711 warn("could not allocate tty structures");
712 error:
713 if (drv->tty)
714 put_tty_driver(drv->tty);
715 }
716
717 void gigaset_if_freedriver(struct gigaset_driver *drv)
718 {
719 if (!drv->have_tty)
720 return;
721
722 drv->have_tty = 0;
723 tty_unregister_driver(drv->tty);
724 put_tty_driver(drv->tty);
725 }
726
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