25750864d206be390d65f6c1799ca4c69fce42e2
2 * interface to user space for the gigaset driver
4 * Copyright (c) 2004 by Hansjoerg Lipp <hjlipp@web.de>
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 * =====================================================================
15 #include <linux/gigaset_dev.h>
16 #include <linux/tty.h>
17 #include <linux/tty_flip.h>
21 static int if_lock(struct cardstate
*cs
, int *arg
)
25 gig_dbg(DEBUG_IF
, "%u: if_lock (%d)", cs
->minor_index
, cmd
);
31 *arg
= atomic_read(&cs
->mstate
) == MS_LOCKED
; //FIXME remove?
35 if (!cmd
&& atomic_read(&cs
->mstate
) == MS_LOCKED
36 && atomic_read(&cs
->connected
)) {
37 cs
->ops
->set_modem_ctrl(cs
, 0, TIOCM_DTR
|TIOCM_RTS
);
38 cs
->ops
->baud_rate(cs
, B115200
);
39 cs
->ops
->set_line_ctrl(cs
, CS8
);
40 cs
->control_state
= TIOCM_DTR
|TIOCM_RTS
;
44 if (!gigaset_add_event(cs
, &cs
->at_state
, EV_IF_LOCK
,
50 gig_dbg(DEBUG_CMD
, "scheduling IF_LOCK");
51 gigaset_schedule_event(cs
);
53 wait_event(cs
->waitqueue
, !cs
->waiting
);
55 if (cs
->cmd_result
>= 0) {
56 *arg
= cs
->cmd_result
;
60 return cs
->cmd_result
;
63 static int if_version(struct cardstate
*cs
, unsigned arg
[4])
65 static const unsigned version
[4] = GIG_VERSION
;
66 static const unsigned compat
[4] = GIG_COMPAT
;
67 unsigned cmd
= arg
[0];
69 gig_dbg(DEBUG_IF
, "%u: if_version (%d)", cs
->minor_index
, cmd
);
73 memcpy(arg
, version
, sizeof version
);
76 memcpy(arg
, compat
, sizeof compat
);
80 if (!gigaset_add_event(cs
, &cs
->at_state
, EV_IF_VER
,
86 gig_dbg(DEBUG_CMD
, "scheduling IF_VER");
87 gigaset_schedule_event(cs
);
89 wait_event(cs
->waitqueue
, !cs
->waiting
);
91 if (cs
->cmd_result
>= 0)
94 return cs
->cmd_result
;
100 static int if_config(struct cardstate
*cs
, int *arg
)
102 gig_dbg(DEBUG_IF
, "%u: if_config (%d)", cs
->minor_index
, *arg
);
107 if (atomic_read(&cs
->mstate
) != MS_LOCKED
)
111 return gigaset_enterconfigmode(cs
);
114 /*** the terminal driver ***/
115 /* stolen from usbserial and some other tty drivers */
117 static int if_open(struct tty_struct
*tty
, struct file
*filp
);
118 static void if_close(struct tty_struct
*tty
, struct file
*filp
);
119 static int if_ioctl(struct tty_struct
*tty
, struct file
*file
,
120 unsigned int cmd
, unsigned long arg
);
121 static int if_write_room(struct tty_struct
*tty
);
122 static int if_chars_in_buffer(struct tty_struct
*tty
);
123 static void if_throttle(struct tty_struct
*tty
);
124 static void if_unthrottle(struct tty_struct
*tty
);
125 static void if_set_termios(struct tty_struct
*tty
, struct termios
*old
);
126 static int if_tiocmget(struct tty_struct
*tty
, struct file
*file
);
127 static int if_tiocmset(struct tty_struct
*tty
, struct file
*file
,
128 unsigned int set
, unsigned int clear
);
129 static int if_write(struct tty_struct
*tty
,
130 const unsigned char *buf
, int count
);
132 static struct tty_operations if_ops
= {
137 .write_room
= if_write_room
,
138 .chars_in_buffer
= if_chars_in_buffer
,
139 .set_termios
= if_set_termios
,
140 .throttle
= if_throttle
,
141 .unthrottle
= if_unthrottle
,
143 .break_ctl
= serial_break
,
145 .tiocmget
= if_tiocmget
,
146 .tiocmset
= if_tiocmset
,
149 static int if_open(struct tty_struct
*tty
, struct file
*filp
)
151 struct cardstate
*cs
;
154 gig_dbg(DEBUG_IF
, "%d+%d: %s()",
155 tty
->driver
->minor_start
, tty
->index
, __func__
);
157 tty
->driver_data
= NULL
;
159 cs
= gigaset_get_cs_by_tty(tty
);
163 if (down_interruptible(&cs
->sem
))
164 return -ERESTARTSYS
; // FIXME -EINTR?
165 tty
->driver_data
= cs
;
169 if (cs
->open_count
== 1) {
170 spin_lock_irqsave(&cs
->lock
, flags
);
172 spin_unlock_irqrestore(&cs
->lock
, flags
);
173 tty
->low_latency
= 1; //FIXME test
180 static void if_close(struct tty_struct
*tty
, struct file
*filp
)
182 struct cardstate
*cs
;
185 cs
= (struct cardstate
*) tty
->driver_data
;
187 err("cs==NULL in %s", __func__
);
191 gig_dbg(DEBUG_IF
, "%u: %s()", cs
->minor_index
, __func__
);
196 warn("%s: device not opened", __func__
);
198 if (!--cs
->open_count
) {
199 spin_lock_irqsave(&cs
->lock
, flags
);
201 spin_unlock_irqrestore(&cs
->lock
, flags
);
208 static int if_ioctl(struct tty_struct
*tty
, struct file
*file
,
209 unsigned int cmd
, unsigned long arg
)
211 struct cardstate
*cs
;
212 int retval
= -ENODEV
;
214 unsigned char buf
[6];
217 cs
= (struct cardstate
*) tty
->driver_data
;
219 err("cs==NULL in %s", __func__
);
223 gig_dbg(DEBUG_IF
, "%u: %s(0x%x)", cs
->minor_index
, __func__
, cmd
);
225 if (down_interruptible(&cs
->sem
))
226 return -ERESTARTSYS
; // FIXME -EINTR?
229 warn("%s: device not opened", __func__
);
234 retval
= get_user(int_arg
, (int __user
*) arg
);
236 retval
= if_lock(cs
, &int_arg
);
238 retval
= put_user(int_arg
, (int __user
*) arg
);
241 retval
= get_user(int_arg
, (int __user
*) arg
);
243 retval
= if_config(cs
, &int_arg
);
245 retval
= put_user(int_arg
, (int __user
*) arg
);
247 case GIGASET_BRKCHARS
:
248 //FIXME test if MS_LOCKED
249 if (!atomic_read(&cs
->connected
)) {
251 "can't communicate with unplugged device");
255 retval
= copy_from_user(&buf
,
256 (const unsigned char __user
*) arg
, 6)
259 gigaset_dbg_buffer(DEBUG_IF
, "GIGASET_BRKCHARS",
260 6, (const unsigned char *) arg
);
261 retval
= cs
->ops
->brkchars(cs
, buf
);
264 case GIGASET_VERSION
:
265 retval
= copy_from_user(version
,
266 (unsigned __user
*) arg
, sizeof version
)
269 retval
= if_version(cs
, version
);
271 retval
= copy_to_user((unsigned __user
*) arg
,
272 version
, sizeof version
)
276 gig_dbg(DEBUG_ANY
, "%s: arg not supported - 0x%04x",
278 retval
= -ENOIOCTLCMD
;
287 static int if_tiocmget(struct tty_struct
*tty
, struct file
*file
)
289 struct cardstate
*cs
;
292 cs
= (struct cardstate
*) tty
->driver_data
;
294 err("cs==NULL in %s", __func__
);
298 gig_dbg(DEBUG_IF
, "%u: %s()", cs
->minor_index
, __func__
);
300 if (down_interruptible(&cs
->sem
))
301 return -ERESTARTSYS
; // FIXME -EINTR?
303 // FIXME read from device?
304 retval
= cs
->control_state
& (TIOCM_RTS
|TIOCM_DTR
);
311 static int if_tiocmset(struct tty_struct
*tty
, struct file
*file
,
312 unsigned int set
, unsigned int clear
)
314 struct cardstate
*cs
;
318 cs
= (struct cardstate
*) tty
->driver_data
;
320 err("cs==NULL in %s", __func__
);
324 gig_dbg(DEBUG_IF
, "%u: %s(0x%x, 0x%x)",
325 cs
->minor_index
, __func__
, set
, clear
);
327 if (down_interruptible(&cs
->sem
))
328 return -ERESTARTSYS
; // FIXME -EINTR?
330 if (!atomic_read(&cs
->connected
)) {
331 gig_dbg(DEBUG_ANY
, "can't communicate with unplugged device");
334 mc
= (cs
->control_state
| set
) & ~clear
& (TIOCM_RTS
|TIOCM_DTR
);
335 retval
= cs
->ops
->set_modem_ctrl(cs
, cs
->control_state
, mc
);
336 cs
->control_state
= mc
;
344 static int if_write(struct tty_struct
*tty
, const unsigned char *buf
, int count
)
346 struct cardstate
*cs
;
347 int retval
= -ENODEV
;
349 cs
= (struct cardstate
*) tty
->driver_data
;
351 err("cs==NULL in %s", __func__
);
355 gig_dbg(DEBUG_IF
, "%u: %s()", cs
->minor_index
, __func__
);
357 if (down_interruptible(&cs
->sem
))
358 return -ERESTARTSYS
; // FIXME -EINTR?
361 warn("%s: device not opened", __func__
);
362 else if (atomic_read(&cs
->mstate
) != MS_LOCKED
) {
363 warn("can't write to unlocked device");
365 } else if (!atomic_read(&cs
->connected
)) {
366 gig_dbg(DEBUG_ANY
, "can't write to unplugged device");
367 retval
= -EBUSY
; //FIXME
369 retval
= cs
->ops
->write_cmd(cs
, buf
, count
,
370 &cs
->if_wake_tasklet
);
378 static int if_write_room(struct tty_struct
*tty
)
380 struct cardstate
*cs
;
381 int retval
= -ENODEV
;
383 cs
= (struct cardstate
*) tty
->driver_data
;
385 err("cs==NULL in %s", __func__
);
389 gig_dbg(DEBUG_IF
, "%u: %s()", cs
->minor_index
, __func__
);
391 if (down_interruptible(&cs
->sem
))
392 return -ERESTARTSYS
; // FIXME -EINTR?
395 warn("%s: device not opened", __func__
);
396 else if (atomic_read(&cs
->mstate
) != MS_LOCKED
) {
397 warn("can't write to unlocked device");
398 retval
= -EBUSY
; //FIXME
399 } else if (!atomic_read(&cs
->connected
)) {
400 gig_dbg(DEBUG_ANY
, "can't write to unplugged device");
401 retval
= -EBUSY
; //FIXME
403 retval
= cs
->ops
->write_room(cs
);
410 static int if_chars_in_buffer(struct tty_struct
*tty
)
412 struct cardstate
*cs
;
413 int retval
= -ENODEV
;
415 cs
= (struct cardstate
*) tty
->driver_data
;
417 err("cs==NULL in %s", __func__
);
421 gig_dbg(DEBUG_IF
, "%u: %s()", cs
->minor_index
, __func__
);
423 if (down_interruptible(&cs
->sem
))
424 return -ERESTARTSYS
; // FIXME -EINTR?
427 warn("%s: device not opened", __func__
);
428 else if (atomic_read(&cs
->mstate
) != MS_LOCKED
) {
429 warn("can't write to unlocked device");
431 } else if (!atomic_read(&cs
->connected
)) {
432 gig_dbg(DEBUG_ANY
, "can't write to unplugged device");
433 retval
= -EBUSY
; //FIXME
435 retval
= cs
->ops
->chars_in_buffer(cs
);
442 static void if_throttle(struct tty_struct
*tty
)
444 struct cardstate
*cs
;
446 cs
= (struct cardstate
*) tty
->driver_data
;
448 err("cs==NULL in %s", __func__
);
452 gig_dbg(DEBUG_IF
, "%u: %s()", cs
->minor_index
, __func__
);
457 warn("%s: device not opened", __func__
);
465 static void if_unthrottle(struct tty_struct
*tty
)
467 struct cardstate
*cs
;
469 cs
= (struct cardstate
*) tty
->driver_data
;
471 err("cs==NULL in %s", __func__
);
475 gig_dbg(DEBUG_IF
, "%u: %s()", cs
->minor_index
, __func__
);
480 warn("%s: device not opened", __func__
);
488 static void if_set_termios(struct tty_struct
*tty
, struct termios
*old
)
490 struct cardstate
*cs
;
493 unsigned int old_cflag
;
494 unsigned int control_state
, new_state
;
496 cs
= (struct cardstate
*) tty
->driver_data
;
498 err("cs==NULL in %s", __func__
);
502 gig_dbg(DEBUG_IF
, "%u: %s()", cs
->minor_index
, __func__
);
506 if (!cs
->open_count
) {
507 warn("%s: device not opened", __func__
);
511 if (!atomic_read(&cs
->connected
)) {
512 gig_dbg(DEBUG_ANY
, "can't communicate with unplugged device");
516 // stolen from mct_u232.c
517 iflag
= tty
->termios
->c_iflag
;
518 cflag
= tty
->termios
->c_cflag
;
519 old_cflag
= old
? old
->c_cflag
: cflag
; //FIXME?
520 gig_dbg(DEBUG_IF
, "%u: iflag %x cflag %x old %x",
521 cs
->minor_index
, iflag
, cflag
, old_cflag
);
523 /* get a local copy of the current port settings */
524 control_state
= cs
->control_state
;
528 * Do not attempt to cache old rates and skip settings,
529 * disconnects screw such tricks up completely.
530 * Premature optimization is the root of all evil.
533 /* reassert DTR and (maybe) RTS on transition from B0 */
534 if ((old_cflag
& CBAUD
) == B0
) {
535 new_state
= control_state
| TIOCM_DTR
;
536 /* don't set RTS if using hardware flow control */
537 if (!(old_cflag
& CRTSCTS
))
538 new_state
|= TIOCM_RTS
;
539 gig_dbg(DEBUG_IF
, "%u: from B0 - set DTR%s",
541 (new_state
& TIOCM_RTS
) ? " only" : "/RTS");
542 cs
->ops
->set_modem_ctrl(cs
, control_state
, new_state
);
543 control_state
= new_state
;
546 cs
->ops
->baud_rate(cs
, cflag
& CBAUD
);
548 if ((cflag
& CBAUD
) == B0
) {
549 /* Drop RTS and DTR */
550 gig_dbg(DEBUG_IF
, "%u: to B0 - drop DTR/RTS", cs
->minor_index
);
551 new_state
= control_state
& ~(TIOCM_DTR
| TIOCM_RTS
);
552 cs
->ops
->set_modem_ctrl(cs
, control_state
, new_state
);
553 control_state
= new_state
;
557 * Update line control register (LCR)
560 cs
->ops
->set_line_ctrl(cs
, cflag
);
563 //FIXME this hangs M101 [ts 2005-03-09]
564 //FIXME do we need this?
566 * Set flow control: well, I do not really now how to handle DTR/RTS.
567 * Just do what we have seen with SniffUSB on Win98.
569 /* Drop DTR/RTS if no flow control otherwise assert */
570 gig_dbg(DEBUG_IF
, "%u: control_state %x",
571 cs
->minor_index
, control_state
);
572 new_state
= control_state
;
573 if ((iflag
& IXOFF
) || (iflag
& IXON
) || (cflag
& CRTSCTS
))
574 new_state
|= TIOCM_DTR
| TIOCM_RTS
;
576 new_state
&= ~(TIOCM_DTR
| TIOCM_RTS
);
577 if (new_state
!= control_state
) {
578 gig_dbg(DEBUG_IF
, "%u: new_state %x",
579 cs
->minor_index
, new_state
);
580 gigaset_set_modem_ctrl(cs
, control_state
, new_state
);
581 control_state
= new_state
;
585 /* save off the modified port settings */
586 cs
->control_state
= control_state
;
593 /* wakeup tasklet for the write operation */
594 static void if_wake(unsigned long data
)
596 struct cardstate
*cs
= (struct cardstate
*) data
;
597 struct tty_struct
*tty
;
603 if ((tty
->flags
& (1 << TTY_DO_WRITE_WAKEUP
)) &&
604 tty
->ldisc
.write_wakeup
) {
605 gig_dbg(DEBUG_IF
, "write wakeup call");
606 tty
->ldisc
.write_wakeup(tty
);
609 wake_up_interruptible(&tty
->write_wait
);
612 /*** interface to common ***/
614 void gigaset_if_init(struct cardstate
*cs
)
616 struct gigaset_driver
*drv
;
622 tasklet_init(&cs
->if_wake_tasklet
, &if_wake
, (unsigned long) cs
);
623 tty_register_device(drv
->tty
, cs
->minor_index
, NULL
);
626 void gigaset_if_free(struct cardstate
*cs
)
628 struct gigaset_driver
*drv
;
634 tasklet_disable(&cs
->if_wake_tasklet
);
635 tasklet_kill(&cs
->if_wake_tasklet
);
636 tty_unregister_device(drv
->tty
, cs
->minor_index
);
639 void gigaset_if_receive(struct cardstate
*cs
,
640 unsigned char *buffer
, size_t len
)
643 struct tty_struct
*tty
;
645 spin_lock_irqsave(&cs
->lock
, flags
);
646 if ((tty
= cs
->tty
) == NULL
)
647 gig_dbg(DEBUG_ANY
, "receive on closed device");
649 tty_buffer_request_room(tty
, len
);
650 tty_insert_flip_string(tty
, buffer
, len
);
651 tty_flip_buffer_push(tty
);
653 spin_unlock_irqrestore(&cs
->lock
, flags
);
655 EXPORT_SYMBOL_GPL(gigaset_if_receive
);
657 /* gigaset_if_initdriver
658 * Initialize tty interface.
661 * procname Name of the driver (e.g. for /proc/tty/drivers)
662 * devname Name of the device files (prefix without minor number)
663 * devfsname Devfs name of the device files without %d
665 void gigaset_if_initdriver(struct gigaset_driver
*drv
, const char *procname
,
666 const char *devname
, const char *devfsname
)
668 unsigned minors
= drv
->minors
;
670 struct tty_driver
*tty
;
674 if ((drv
->tty
= alloc_tty_driver(minors
)) == NULL
)
678 tty
->magic
= TTY_DRIVER_MAGIC
,
679 tty
->major
= GIG_MAJOR
,
680 tty
->type
= TTY_DRIVER_TYPE_SERIAL
,
681 tty
->subtype
= SERIAL_TYPE_NORMAL
,
682 tty
->flags
= TTY_DRIVER_REAL_RAW
| TTY_DRIVER_NO_DEVFS
,
684 tty
->driver_name
= procname
;
686 tty
->minor_start
= drv
->minor
;
687 tty
->num
= drv
->minors
;
689 tty
->owner
= THIS_MODULE
;
690 tty
->devfs_name
= devfsname
;
692 tty
->init_termios
= tty_std_termios
; //FIXME
693 tty
->init_termios
.c_cflag
= B9600
| CS8
| CREAD
| HUPCL
| CLOCAL
; //FIXME
694 tty_set_operations(tty
, &if_ops
);
696 ret
= tty_register_driver(tty
);
698 warn("failed to register tty driver (error %d)", ret
);
701 gig_dbg(DEBUG_IF
, "tty driver initialized");
706 warn("could not allocate tty structures");
709 put_tty_driver(drv
->tty
);
712 void gigaset_if_freedriver(struct gigaset_driver
*drv
)
718 tty_unregister_driver(drv
->tty
);
719 put_tty_driver(drv
->tty
);
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