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drivers/char/ip2/ip2main.c: replace init_module&cleanup_module with module_init&modul...
[deliverable/linux.git] / drivers / char / generic_serial.c
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1da177e4
LT		 1/*
2 * generic_serial.c
3 *
4 * Copyright (C) 1998/1999 R.E.Wolff@BitWizard.nl
5 *
6 * written for the SX serial driver.
7 * Contains the code that should be shared over all the serial drivers.
8 *
9 * Credit for the idea to do it this way might go to Alan Cox.
10 *
11 *
12 * Version 0.1 -- December, 1998. Initial version.
13 * Version 0.2 -- March, 1999. Some more routines. Bugfixes. Etc.
14 * Version 0.5 -- August, 1999. Some more fixes. Reformat for Linus.
15 *
16 * BitWizard is actively maintaining this file. We sometimes find
17 * that someone submitted changes to this file. We really appreciate
18 * your help, but please submit changes through us. We're doing our
19 * best to be responsive. -- REW
20 * */
21
22#include <linux/module.h>
23#include <linux/kernel.h>
24#include <linux/tty.h>
25#include <linux/serial.h>
26#include <linux/mm.h>
27#include <linux/generic_serial.h>
28#include <linux/interrupt.h>
29#include <linux/tty_flip.h>
30#include <linux/delay.h>
1da177e4
LT		 31#include <asm/uaccess.h>
32
33#define DEBUG
34
1da177e4
LT		 35static int gs_debug;
36
37#ifdef DEBUG
38#define gs_dprintk(f, str...) if (gs_debug & f) printk (str)
39#else
40#define gs_dprintk(f, str...) /* nothing */
41#endif
42
43#define func_enter() gs_dprintk (GS_DEBUG_FLOW, "gs: enter %s\n", __FUNCTION__)
44#define func_exit() gs_dprintk (GS_DEBUG_FLOW, "gs: exit %s\n", __FUNCTION__)
1da177e4
LT		 45
46#define RS_EVENT_WRITE_WAKEUP 1
47
48module_param(gs_debug, int, 0644);
49
50
51void gs_put_char(struct tty_struct * tty, unsigned char ch)
52{
53 struct gs_port *port;
1da177e4
LT		 54
55 func_enter ();
56
57 if (!tty) return;
58
59 port = tty->driver_data;
60
61 if (!port) return;
62
63 if (! (port->flags & ASYNC_INITIALIZED)) return;
64
65 /* Take a lock on the serial tranmit buffer! */
35426128 66 mutex_lock(& port->port_write_mutex);
1da177e4
LT		 67
68 if (port->xmit_cnt >= SERIAL_XMIT_SIZE - 1) {
69 /* Sorry, buffer is full, drop character. Update statistics???? -- REW */
35426128 70 mutex_unlock(&port->port_write_mutex);
1da177e4
LT		 71 return;
72 }
73
74 port->xmit_buf[port->xmit_head++] = ch;
75 port->xmit_head &= SERIAL_XMIT_SIZE - 1;
76 port->xmit_cnt++; /* Characters in buffer */
77
35426128 78 mutex_unlock(&port->port_write_mutex);
1da177e4
LT		 79 func_exit ();
80}
81
82
1da177e4
LT		 83/*
84> Problems to take into account are:
85> -1- Interrupts that empty part of the buffer.
86> -2- page faults on the access to userspace.
87> -3- Other processes that are also trying to do a "write".
88*/
89
90int gs_write(struct tty_struct * tty,
91 const unsigned char *buf, int count)
92{
93 struct gs_port *port;
94 int c, total = 0;
95 int t;
96
97 func_enter ();
98
99 if (!tty) return 0;
100
101 port = tty->driver_data;
102
103 if (!port) return 0;
104
105 if (! (port->flags & ASYNC_INITIALIZED))
106 return 0;
107
108 /* get exclusive "write" access to this port (problem 3) */
109 /* This is not a spinlock because we can have a disk access (page
110 fault) in copy_from_user */
81861d78 111 mutex_lock(& port->port_write_mutex);
1da177e4
LT		 112
113 while (1) {
114
115 c = count;
116
117 /* This is safe because we "OWN" the "head". Noone else can
81861d78 118 change the "head": we own the port_write_mutex. */
1da177e4
LT		 119 /* Don't overrun the end of the buffer */
120 t = SERIAL_XMIT_SIZE - port->xmit_head;
121 if (t < c) c = t;
122
123 /* This is safe because the xmit_cnt can only decrease. This
124 would increase "t", so we might copy too little chars. */
125 /* Don't copy past the "head" of the buffer */
126 t = SERIAL_XMIT_SIZE - 1 - port->xmit_cnt;
127 if (t < c) c = t;
128
129 /* Can't copy more? break out! */
130 if (c <= 0) break;
131
132 memcpy (port->xmit_buf + port->xmit_head, buf, c);
133
134 port -> xmit_cnt += c;
135 port -> xmit_head = (port->xmit_head + c) & (SERIAL_XMIT_SIZE -1);
136 buf += c;
137 count -= c;
138 total += c;
139 }
81861d78 140 mutex_unlock(& port->port_write_mutex);
1da177e4
LT		 141
142 gs_dprintk (GS_DEBUG_WRITE, "write: interrupts are %s\n",
143 (port->flags & GS_TX_INTEN)?"enabled": "disabled");
144
145 if (port->xmit_cnt &&
146 !tty->stopped &&
147 !tty->hw_stopped &&
148 !(port->flags & GS_TX_INTEN)) {
149 port->flags |= GS_TX_INTEN;
150 port->rd->enable_tx_interrupts (port);
151 }
152 func_exit ();
153 return total;
154}
1da177e4
LT		 155
156
157
158int gs_write_room(struct tty_struct * tty)
159{
160 struct gs_port *port = tty->driver_data;
161 int ret;
162
163 func_enter ();
164 ret = SERIAL_XMIT_SIZE - port->xmit_cnt - 1;
165 if (ret < 0)
166 ret = 0;
167 func_exit ();
168 return ret;
169}
170
171
172int gs_chars_in_buffer(struct tty_struct *tty)
173{
174 struct gs_port *port = tty->driver_data;
175 func_enter ();
176
177 func_exit ();
178 return port->xmit_cnt;
179}
180
181
182static int gs_real_chars_in_buffer(struct tty_struct *tty)
183{
184 struct gs_port *port;
185 func_enter ();
186
187 if (!tty) return 0;
188 port = tty->driver_data;
189
190 if (!port->rd) return 0;
191 if (!port->rd->chars_in_buffer) return 0;
192
193 func_exit ();
194 return port->xmit_cnt + port->rd->chars_in_buffer (port);
195}
196
197
198static int gs_wait_tx_flushed (void * ptr, unsigned long timeout)
199{
200 struct gs_port *port = ptr;
201 unsigned long end_jiffies;
202 int jiffies_to_transmit, charsleft = 0, rv = 0;
203 int rcib;
204
205 func_enter();
206
207 gs_dprintk (GS_DEBUG_FLUSH, "port=%p.\n", port);
208 if (port) {
209 gs_dprintk (GS_DEBUG_FLUSH, "xmit_cnt=%x, xmit_buf=%p, tty=%p.\n",
210 port->xmit_cnt, port->xmit_buf, port->tty);
211 }
212
213 if (!port || port->xmit_cnt < 0 || !port->xmit_buf) {
214 gs_dprintk (GS_DEBUG_FLUSH, "ERROR: !port, !port->xmit_buf or prot->xmit_cnt < 0.\n");
215 func_exit();
216 return -EINVAL; /* This is an error which we don't know how to handle. */
217 }
218
219 rcib = gs_real_chars_in_buffer(port->tty);
220
221 if(rcib <= 0) {
222 gs_dprintk (GS_DEBUG_FLUSH, "nothing to wait for.\n");
223 func_exit();
224 return rv;
225 }
226 /* stop trying: now + twice the time it would normally take + seconds */
227 if (timeout == 0) timeout = MAX_SCHEDULE_TIMEOUT;
228 end_jiffies = jiffies;
229 if (timeout != MAX_SCHEDULE_TIMEOUT)
230 end_jiffies += port->baud?(2 * rcib * 10 * HZ / port->baud):0;
231 end_jiffies += timeout;
232
233 gs_dprintk (GS_DEBUG_FLUSH, "now=%lx, end=%lx (%ld).\n",
234 jiffies, end_jiffies, end_jiffies-jiffies);
235
236 /* the expression is actually jiffies < end_jiffies, but that won't
237 work around the wraparound. Tricky eh? */
238 while ((charsleft = gs_real_chars_in_buffer (port->tty)) &&
239 time_after (end_jiffies, jiffies)) {
240 /* Units check:
241 chars * (bits/char) * (jiffies /sec) / (bits/sec) = jiffies!
242 check! */
243
244 charsleft += 16; /* Allow 16 chars more to be transmitted ... */
245 jiffies_to_transmit = port->baud?(1 + charsleft * 10 * HZ / port->baud):0;
246 /* ^^^ Round up.... */
247 if (jiffies_to_transmit <= 0) jiffies_to_transmit = 1;
248
249 gs_dprintk (GS_DEBUG_FLUSH, "Expect to finish in %d jiffies "
250 "(%d chars).\n", jiffies_to_transmit, charsleft);
251
252 msleep_interruptible(jiffies_to_msecs(jiffies_to_transmit));
253 if (signal_pending (current)) {
254 gs_dprintk (GS_DEBUG_FLUSH, "Signal pending. Bombing out: ");
255 rv = -EINTR;
256 break;
257 }
258 }
259
260 gs_dprintk (GS_DEBUG_FLUSH, "charsleft = %d.\n", charsleft);
261 set_current_state (TASK_RUNNING);
262
263 func_exit();
264 return rv;
265}
266
267
268
269void gs_flush_buffer(struct tty_struct *tty)
270{
271 struct gs_port *port;
272 unsigned long flags;
273
274 func_enter ();
275
276 if (!tty) return;
277
278 port = tty->driver_data;
279
280 if (!port) return;
281
282 /* XXX Would the write semaphore do? */
283 spin_lock_irqsave (&port->driver_lock, flags);
284 port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
285 spin_unlock_irqrestore (&port->driver_lock, flags);
286
1da177e4
LT		 287 tty_wakeup(tty);
288 func_exit ();
289}
290
291
292void gs_flush_chars(struct tty_struct * tty)
293{
294 struct gs_port *port;
295
296 func_enter ();
297
298 if (!tty) return;
299
300 port = tty->driver_data;
301
302 if (!port) return;
303
304 if (port->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
305 !port->xmit_buf) {
306 func_exit ();
307 return;
308 }
309
310 /* Beats me -- REW */
311 port->flags |= GS_TX_INTEN;
312 port->rd->enable_tx_interrupts (port);
313 func_exit ();
314}
315
316
317void gs_stop(struct tty_struct * tty)
318{
319 struct gs_port *port;
320
321 func_enter ();
322
323 if (!tty) return;
324
325 port = tty->driver_data;
326
327 if (!port) return;
328
329 if (port->xmit_cnt &&
330 port->xmit_buf &&
331 (port->flags & GS_TX_INTEN) ) {
332 port->flags &= ~GS_TX_INTEN;
333 port->rd->disable_tx_interrupts (port);
334 }
335 func_exit ();
336}
337
338
339void gs_start(struct tty_struct * tty)
340{
341 struct gs_port *port;
342
343 if (!tty) return;
344
345 port = tty->driver_data;
346
347 if (!port) return;
348
349 if (port->xmit_cnt &&
350 port->xmit_buf &&
351 !(port->flags & GS_TX_INTEN) ) {
352 port->flags |= GS_TX_INTEN;
353 port->rd->enable_tx_interrupts (port);
354 }
355 func_exit ();
356}
357
358
359static void gs_shutdown_port (struct gs_port *port)
360{
361 unsigned long flags;
362
363 func_enter();
364
365 if (!port) return;
366
367 if (!(port->flags & ASYNC_INITIALIZED))
368 return;
369
370 spin_lock_irqsave(&port->driver_lock, flags);
371
372 if (port->xmit_buf) {
373 free_page((unsigned long) port->xmit_buf);
374 port->xmit_buf = NULL;
375 }
376
377 if (port->tty)
378 set_bit(TTY_IO_ERROR, &port->tty->flags);
379
380 port->rd->shutdown_port (port);
381
382 port->flags &= ~ASYNC_INITIALIZED;
383 spin_unlock_irqrestore(&port->driver_lock, flags);
384
385 func_exit();
386}
387
388
389void gs_hangup(struct tty_struct *tty)
390{
391 struct gs_port *port;
392
393 func_enter ();
394
395 if (!tty) return;
396
397 port = tty->driver_data;
398 tty = port->tty;
399 if (!tty)
400 return;
401
402 gs_shutdown_port (port);
403 port->flags &= ~(ASYNC_NORMAL_ACTIVE|GS_ACTIVE);
404 port->tty = NULL;
405 port->count = 0;
406
407 wake_up_interruptible(&port->open_wait);
408 func_exit ();
409}
410
411
412int gs_block_til_ready(void *port_, struct file * filp)
413{
414 struct gs_port *port = port_;
415 DECLARE_WAITQUEUE(wait, current);
416 int retval;
417 int do_clocal = 0;
418 int CD;
419 struct tty_struct *tty;
420 unsigned long flags;
421
422 func_enter ();
423
424 if (!port) return 0;
425
426 tty = port->tty;
427
428 if (!tty) return 0;
429
430 gs_dprintk (GS_DEBUG_BTR, "Entering gs_block_till_ready.\n");
431 /*
432 * If the device is in the middle of being closed, then block
433 * until it's done, and then try again.
434 */
435 if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING) {
436 interruptible_sleep_on(&port->close_wait);
437 if (port->flags & ASYNC_HUP_NOTIFY)
438 return -EAGAIN;
439 else
440 return -ERESTARTSYS;
441 }
442
443 gs_dprintk (GS_DEBUG_BTR, "after hung up\n");
444
445 /*
446 * If non-blocking mode is set, or the port is not enabled,
447 * then make the check up front and then exit.
448 */
449 if ((filp->f_flags & O_NONBLOCK) ||
450 (tty->flags & (1 << TTY_IO_ERROR))) {
451 port->flags |= ASYNC_NORMAL_ACTIVE;
452 return 0;
453 }
454
455 gs_dprintk (GS_DEBUG_BTR, "after nonblock\n");
456
457 if (C_CLOCAL(tty))
458 do_clocal = 1;
459
460 /*
461 * Block waiting for the carrier detect and the line to become
462 * free (i.e., not in use by the callout). While we are in
463 * this loop, port->count is dropped by one, so that
464 * rs_close() knows when to free things. We restore it upon
465 * exit, either normal or abnormal.
466 */
467 retval = 0;
468
469 add_wait_queue(&port->open_wait, &wait);
470
471 gs_dprintk (GS_DEBUG_BTR, "after add waitq.\n");
472 spin_lock_irqsave(&port->driver_lock, flags);
473 if (!tty_hung_up_p(filp)) {
474 port->count--;
475 }
476 spin_unlock_irqrestore(&port->driver_lock, flags);
477 port->blocked_open++;
478 while (1) {
479 CD = port->rd->get_CD (port);
480 gs_dprintk (GS_DEBUG_BTR, "CD is now %d.\n", CD);
481 set_current_state (TASK_INTERRUPTIBLE);
482 if (tty_hung_up_p(filp) ||
483 !(port->flags & ASYNC_INITIALIZED)) {
484 if (port->flags & ASYNC_HUP_NOTIFY)
485 retval = -EAGAIN;
486 else
487 retval = -ERESTARTSYS;
488 break;
489 }
490 if (!(port->flags & ASYNC_CLOSING) &&
491 (do_clocal || CD))
492 break;
493 gs_dprintk (GS_DEBUG_BTR, "signal_pending is now: %d (%lx)\n",
494 (int)signal_pending (current), *(long*)(&current->blocked));
495 if (signal_pending(current)) {
496 retval = -ERESTARTSYS;
497 break;
498 }
499 schedule();
500 }
501 gs_dprintk (GS_DEBUG_BTR, "Got out of the loop. (%d)\n",
502 port->blocked_open);
503 set_current_state (TASK_RUNNING);
504 remove_wait_queue(&port->open_wait, &wait);
505 if (!tty_hung_up_p(filp)) {
506 port->count++;
507 }
508 port->blocked_open--;
509 if (retval)
510 return retval;
511
512 port->flags |= ASYNC_NORMAL_ACTIVE;
513 func_exit ();
514 return 0;
515}
516
517
518void gs_close(struct tty_struct * tty, struct file * filp)
519{
520 unsigned long flags;
521 struct gs_port *port;
522
523 func_enter ();
524
525 if (!tty) return;
526
527 port = (struct gs_port *) tty->driver_data;
528
529 if (!port) return;
530
531 if (!port->tty) {
532 /* This seems to happen when this is called from vhangup. */
533 gs_dprintk (GS_DEBUG_CLOSE, "gs: Odd: port->tty is NULL\n");
534 port->tty = tty;
535 }
536
537 spin_lock_irqsave(&port->driver_lock, flags);
538
539 if (tty_hung_up_p(filp)) {
540 spin_unlock_irqrestore(&port->driver_lock, flags);
541 if (port->rd->hungup)
542 port->rd->hungup (port);
543 func_exit ();
544 return;
545 }
546
547 if ((tty->count == 1) && (port->count != 1)) {
548 printk(KERN_ERR "gs: gs_close port %p: bad port count;"
549 " tty->count is 1, port count is %d\n", port, port->count);
550 port->count = 1;
551 }
552 if (--port->count < 0) {
553 printk(KERN_ERR "gs: gs_close port %p: bad port count: %d\n", port, port->count);
554 port->count = 0;
555 }
556
557 if (port->count) {
558 gs_dprintk(GS_DEBUG_CLOSE, "gs_close port %p: count: %d\n", port, port->count);
559 spin_unlock_irqrestore(&port->driver_lock, flags);
560 func_exit ();
561 return;
562 }
563 port->flags |= ASYNC_CLOSING;
564
565 /*
566 * Now we wait for the transmit buffer to clear; and we notify
567 * the line discipline to only process XON/XOFF characters.
568 */
569 tty->closing = 1;
570 /* if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE)
571 tty_wait_until_sent(tty, port->closing_wait); */
572
573 /*
574 * At this point we stop accepting input. To do this, we
575 * disable the receive line status interrupts, and tell the
576 * interrupt driver to stop checking the data ready bit in the
577 * line status register.
578 */
579
580 port->rd->disable_rx_interrupts (port);
581 spin_unlock_irqrestore(&port->driver_lock, flags);
582
583 /* close has no way of returning "EINTR", so discard return value */
584 if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE)
585 gs_wait_tx_flushed (port, port->closing_wait);
586
587 port->flags &= ~GS_ACTIVE;
588
589 if (tty->driver->flush_buffer)
590 tty->driver->flush_buffer(tty);
591
592 tty_ldisc_flush(tty);
593 tty->closing = 0;
594
595 port->event = 0;
596 port->rd->close (port);
597 port->rd->shutdown_port (port);
598 port->tty = NULL;
599
600 if (port->blocked_open) {
601 if (port->close_delay) {
602 spin_unlock_irqrestore(&port->driver_lock, flags);
603 msleep_interruptible(jiffies_to_msecs(port->close_delay));
604 spin_lock_irqsave(&port->driver_lock, flags);
605 }
606 wake_up_interruptible(&port->open_wait);
607 }
608 port->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING | ASYNC_INITIALIZED);
609 wake_up_interruptible(&port->close_wait);
610
611 func_exit ();
612}
613
614
1da177e4 615void gs_set_termios (struct tty_struct * tty,
606d099c 616 struct ktermios * old_termios)
1da177e4
LT		 617{
618 struct gs_port *port;
619 int baudrate, tmp, rv;
606d099c 620 struct ktermios *tiosp;
1da177e4
LT		 621
622 func_enter();
623
624 if (!tty) return;
625
626 port = tty->driver_data;
627
628 if (!port) return;
629 if (!port->tty) {
630 /* This seems to happen when this is called after gs_close. */
631 gs_dprintk (GS_DEBUG_TERMIOS, "gs: Odd: port->tty is NULL\n");
632 port->tty = tty;
633 }
634
635
636 tiosp = tty->termios;
637
638 if (gs_debug & GS_DEBUG_TERMIOS) {
639 gs_dprintk (GS_DEBUG_TERMIOS, "termios structure (%p):\n", tiosp);
640 }
641
1da177e4
LT		 642 if(old_termios && (gs_debug & GS_DEBUG_TERMIOS)) {
643 if(tiosp->c_iflag != old_termios->c_iflag) printk("c_iflag changed\n");
644 if(tiosp->c_oflag != old_termios->c_oflag) printk("c_oflag changed\n");
645 if(tiosp->c_cflag != old_termios->c_cflag) printk("c_cflag changed\n");
646 if(tiosp->c_lflag != old_termios->c_lflag) printk("c_lflag changed\n");
647 if(tiosp->c_line != old_termios->c_line) printk("c_line changed\n");
648 if(!memcmp(tiosp->c_cc, old_termios->c_cc, NCC)) printk("c_cc changed\n");
649 }
650
d720bc4b 651 baudrate = tty_get_baud_rate(tty);
1da177e4 652
1da177e4
LT		 653 if ((tiosp->c_cflag & CBAUD) == B38400) {
654 if ( (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
655 baudrate = 57600;
656 else if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
657 baudrate = 115200;
658 else if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
659 baudrate = 230400;
660 else if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
661 baudrate = 460800;
662 else if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
663 baudrate = (port->baud_base / port->custom_divisor);
664 }
665
666 /* I recommend using THIS instead of the mess in termios (and
667 duplicating the above code). Next we should create a clean
668 interface towards this variable. If your card supports arbitrary
669 baud rates, (e.g. CD1400 or 16550 based cards) then everything
670 will be very easy..... */
671 port->baud = baudrate;
672
673 /* Two timer ticks seems enough to wakeup something like SLIP driver */
674 /* Baudrate/10 is cps. Divide by HZ to get chars per tick. */
675 tmp = (baudrate / 10 / HZ) * 2;
676
677 if (tmp < 0) tmp = 0;
678 if (tmp >= SERIAL_XMIT_SIZE) tmp = SERIAL_XMIT_SIZE-1;
679
680 port->wakeup_chars = tmp;
681
682 /* We should really wait for the characters to be all sent before
683 changing the settings. -- CAL */
684 rv = gs_wait_tx_flushed (port, MAX_SCHEDULE_TIMEOUT);
685 if (rv < 0) return /* rv */;
686
687 rv = port->rd->set_real_termios(port);
688 if (rv < 0) return /* rv */;
689
690 if ((!old_termios ||
691 (old_termios->c_cflag & CRTSCTS)) &&
692 !( tiosp->c_cflag & CRTSCTS)) {
693 tty->stopped = 0;
694 gs_start(tty);
695 }
696
697#ifdef tytso_patch_94Nov25_1726
698 /* This "makes sense", Why is it commented out? */
699
700 if (!(old_termios->c_cflag & CLOCAL) &&
701 (tty->termios->c_cflag & CLOCAL))
702 wake_up_interruptible(&port->gs.open_wait);
703#endif
704
705 func_exit();
706 return /* 0 */;
707}
708
709
710
711/* Must be called with interrupts enabled */
712int gs_init_port(struct gs_port *port)
713{
714 unsigned long flags;
1da177e4
LT		 715
716 func_enter ();
717
1da177e4
LT		 718 if (port->flags & ASYNC_INITIALIZED) {
719 func_exit ();
720 return 0;
721 }
722 if (!port->xmit_buf) {
723 /* We may sleep in get_zeroed_page() */
724 unsigned long tmp;
725
726 tmp = get_zeroed_page(GFP_KERNEL);
727 spin_lock_irqsave (&port->driver_lock, flags);
728 if (port->xmit_buf)
729 free_page (tmp);
730 else
731 port->xmit_buf = (unsigned char *) tmp;
732 spin_unlock_irqrestore(&port->driver_lock, flags);
733 if (!port->xmit_buf) {
734 func_exit ();
735 return -ENOMEM;
736 }
737 }
738
739 spin_lock_irqsave (&port->driver_lock, flags);
740 if (port->tty)
741 clear_bit(TTY_IO_ERROR, &port->tty->flags);
81861d78 742 mutex_init(&port->port_write_mutex);
1da177e4
LT		 743 port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
744 spin_unlock_irqrestore(&port->driver_lock, flags);
745 gs_set_termios(port->tty, NULL);
746 spin_lock_irqsave (&port->driver_lock, flags);
747 port->flags |= ASYNC_INITIALIZED;
748 port->flags &= ~GS_TX_INTEN;
749
750 spin_unlock_irqrestore(&port->driver_lock, flags);
751 func_exit ();
752 return 0;
753}
754
755
756int gs_setserial(struct gs_port *port, struct serial_struct __user *sp)
757{
758 struct serial_struct sio;
759
760 if (copy_from_user(&sio, sp, sizeof(struct serial_struct)))
761 return(-EFAULT);
762
763 if (!capable(CAP_SYS_ADMIN)) {
764 if ((sio.baud_base != port->baud_base) ||
765 (sio.close_delay != port->close_delay) ||
766 ((sio.flags & ~ASYNC_USR_MASK) !=
767 (port->flags & ~ASYNC_USR_MASK)))
768 return(-EPERM);
769 }
770
771 port->flags = (port->flags & ~ASYNC_USR_MASK) |
772 (sio.flags & ASYNC_USR_MASK);
773
774 port->baud_base = sio.baud_base;
775 port->close_delay = sio.close_delay;
776 port->closing_wait = sio.closing_wait;
777 port->custom_divisor = sio.custom_divisor;
778
779 gs_set_termios (port->tty, NULL);
780
781 return 0;
782}
783
784
785/*****************************************************************************/
786
787/*
788 * Generate the serial struct info.
789 */
790
791int gs_getserial(struct gs_port *port, struct serial_struct __user *sp)
792{
793 struct serial_struct sio;
794
795 memset(&sio, 0, sizeof(struct serial_struct));
796 sio.flags = port->flags;
797 sio.baud_base = port->baud_base;
798 sio.close_delay = port->close_delay;
799 sio.closing_wait = port->closing_wait;
800 sio.custom_divisor = port->custom_divisor;
801 sio.hub6 = 0;
802
803 /* If you want you can override these. */
804 sio.type = PORT_UNKNOWN;
805 sio.xmit_fifo_size = -1;
806 sio.line = -1;
807 sio.port = -1;
808 sio.irq = -1;
809
810 if (port->rd->getserial)
811 port->rd->getserial (port, &sio);
812
813 if (copy_to_user(sp, &sio, sizeof(struct serial_struct)))
814 return -EFAULT;
815 return 0;
816
817}
818
819
820void gs_got_break(struct gs_port *port)
821{
822 func_enter ();
823
824 tty_insert_flip_char(port->tty, 0, TTY_BREAK);
825 tty_schedule_flip(port->tty);
826 if (port->flags & ASYNC_SAK) {
827 do_SAK (port->tty);
828 }
829
830 func_exit ();
831}
832
833
834EXPORT_SYMBOL(gs_put_char);
835EXPORT_SYMBOL(gs_write);
836EXPORT_SYMBOL(gs_write_room);
837EXPORT_SYMBOL(gs_chars_in_buffer);
838EXPORT_SYMBOL(gs_flush_buffer);
839EXPORT_SYMBOL(gs_flush_chars);
840EXPORT_SYMBOL(gs_stop);
841EXPORT_SYMBOL(gs_start);
842EXPORT_SYMBOL(gs_hangup);
843EXPORT_SYMBOL(gs_block_til_ready);
844EXPORT_SYMBOL(gs_close);
845EXPORT_SYMBOL(gs_set_termios);
846EXPORT_SYMBOL(gs_init_port);
847EXPORT_SYMBOL(gs_setserial);
848EXPORT_SYMBOL(gs_getserial);
849EXPORT_SYMBOL(gs_got_break);
850
851MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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