]>
git.proxmox.com Git - mirror_ubuntu-kernels.git/blob - drivers/isdn/gigaset/interface.c
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
= cs
->mstate
== MS_LOCKED
;
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
;
43 if (!gigaset_add_event(cs
, &cs
->at_state
, EV_IF_LOCK
,
49 gig_dbg(DEBUG_CMD
, "scheduling IF_LOCK");
50 gigaset_schedule_event(cs
);
52 wait_event(cs
->waitqueue
, !cs
->waiting
);
54 if (cs
->cmd_result
>= 0) {
55 *arg
= cs
->cmd_result
;
59 return cs
->cmd_result
;
62 static int if_version(struct cardstate
*cs
, unsigned arg
[4])
64 static const unsigned version
[4] = GIG_VERSION
;
65 static const unsigned compat
[4] = GIG_COMPAT
;
66 unsigned cmd
= arg
[0];
68 gig_dbg(DEBUG_IF
, "%u: if_version (%d)", cs
->minor_index
, cmd
);
72 memcpy(arg
, version
, sizeof version
);
75 memcpy(arg
, compat
, sizeof compat
);
79 if (!gigaset_add_event(cs
, &cs
->at_state
, EV_IF_VER
,
85 gig_dbg(DEBUG_CMD
, "scheduling IF_VER");
86 gigaset_schedule_event(cs
);
88 wait_event(cs
->waitqueue
, !cs
->waiting
);
90 if (cs
->cmd_result
>= 0)
93 return cs
->cmd_result
;
99 static int if_config(struct cardstate
*cs
, int *arg
)
101 gig_dbg(DEBUG_IF
, "%u: if_config (%d)", cs
->minor_index
, *arg
);
106 if (cs
->mstate
!= MS_LOCKED
)
109 if (!cs
->connected
) {
110 pr_err("%s: not connected\n", __func__
);
115 return gigaset_enterconfigmode(cs
);
118 /*** the terminal driver ***/
119 /* stolen from usbserial and some other tty drivers */
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
);
136 static const struct tty_operations if_ops
= {
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 .tiocmget
= if_tiocmget
,
147 .tiocmset
= if_tiocmset
,
150 static int if_open(struct tty_struct
*tty
, struct file
*filp
)
152 struct cardstate
*cs
;
155 gig_dbg(DEBUG_IF
, "%d+%d: %s()",
156 tty
->driver
->minor_start
, tty
->index
, __func__
);
158 tty
->driver_data
= NULL
;
160 cs
= gigaset_get_cs_by_tty(tty
);
161 if (!cs
|| !try_module_get(cs
->driver
->owner
))
164 if (mutex_lock_interruptible(&cs
->mutex
))
165 return -ERESTARTSYS
; // FIXME -EINTR?
166 tty
->driver_data
= cs
;
170 if (cs
->open_count
== 1) {
171 spin_lock_irqsave(&cs
->lock
, flags
);
173 spin_unlock_irqrestore(&cs
->lock
, flags
);
174 tty
->low_latency
= 1; //FIXME test
177 mutex_unlock(&cs
->mutex
);
181 static void if_close(struct tty_struct
*tty
, struct file
*filp
)
183 struct cardstate
*cs
;
186 cs
= (struct cardstate
*) tty
->driver_data
;
188 pr_err("%s: no cardstate\n", __func__
);
192 gig_dbg(DEBUG_IF
, "%u: %s()", cs
->minor_index
, __func__
);
194 mutex_lock(&cs
->mutex
);
197 dev_warn(cs
->dev
, "%s: device not opened\n", __func__
);
199 if (!--cs
->open_count
) {
200 spin_lock_irqsave(&cs
->lock
, flags
);
202 spin_unlock_irqrestore(&cs
->lock
, flags
);
206 mutex_unlock(&cs
->mutex
);
208 module_put(cs
->driver
->owner
);
211 static int if_ioctl(struct tty_struct
*tty
, struct file
*file
,
212 unsigned int cmd
, unsigned long arg
)
214 struct cardstate
*cs
;
215 int retval
= -ENODEV
;
217 unsigned char buf
[6];
220 cs
= (struct cardstate
*) tty
->driver_data
;
222 pr_err("%s: no cardstate\n", __func__
);
226 gig_dbg(DEBUG_IF
, "%u: %s(0x%x)", cs
->minor_index
, __func__
, cmd
);
228 if (mutex_lock_interruptible(&cs
->mutex
))
229 return -ERESTARTSYS
; // FIXME -EINTR?
232 dev_warn(cs
->dev
, "%s: device not opened\n", __func__
);
237 retval
= get_user(int_arg
, (int __user
*) arg
);
239 retval
= if_lock(cs
, &int_arg
);
241 retval
= put_user(int_arg
, (int __user
*) arg
);
244 retval
= get_user(int_arg
, (int __user
*) arg
);
246 retval
= if_config(cs
, &int_arg
);
248 retval
= put_user(int_arg
, (int __user
*) arg
);
250 case GIGASET_BRKCHARS
:
251 //FIXME test if MS_LOCKED
252 if (!cs
->connected
) {
254 "can't communicate with unplugged device");
258 retval
= copy_from_user(&buf
,
259 (const unsigned char __user
*) arg
, 6)
262 gigaset_dbg_buffer(DEBUG_IF
, "GIGASET_BRKCHARS",
263 6, (const unsigned char *) arg
);
264 retval
= cs
->ops
->brkchars(cs
, buf
);
267 case GIGASET_VERSION
:
268 retval
= copy_from_user(version
,
269 (unsigned __user
*) arg
, sizeof version
)
272 retval
= if_version(cs
, version
);
274 retval
= copy_to_user((unsigned __user
*) arg
,
275 version
, sizeof version
)
279 gig_dbg(DEBUG_ANY
, "%s: arg not supported - 0x%04x",
281 retval
= -ENOIOCTLCMD
;
285 mutex_unlock(&cs
->mutex
);
290 static int if_tiocmget(struct tty_struct
*tty
, struct file
*file
)
292 struct cardstate
*cs
;
295 cs
= (struct cardstate
*) tty
->driver_data
;
297 pr_err("%s: no cardstate\n", __func__
);
301 gig_dbg(DEBUG_IF
, "%u: %s()", cs
->minor_index
, __func__
);
303 if (mutex_lock_interruptible(&cs
->mutex
))
304 return -ERESTARTSYS
; // FIXME -EINTR?
306 // FIXME read from device?
307 retval
= cs
->control_state
& (TIOCM_RTS
|TIOCM_DTR
);
309 mutex_unlock(&cs
->mutex
);
314 static int if_tiocmset(struct tty_struct
*tty
, struct file
*file
,
315 unsigned int set
, unsigned int clear
)
317 struct cardstate
*cs
;
321 cs
= (struct cardstate
*) tty
->driver_data
;
323 pr_err("%s: no cardstate\n", __func__
);
327 gig_dbg(DEBUG_IF
, "%u: %s(0x%x, 0x%x)",
328 cs
->minor_index
, __func__
, set
, clear
);
330 if (mutex_lock_interruptible(&cs
->mutex
))
331 return -ERESTARTSYS
; // FIXME -EINTR?
333 if (!cs
->connected
) {
334 gig_dbg(DEBUG_ANY
, "can't communicate with unplugged device");
337 mc
= (cs
->control_state
| set
) & ~clear
& (TIOCM_RTS
|TIOCM_DTR
);
338 retval
= cs
->ops
->set_modem_ctrl(cs
, cs
->control_state
, mc
);
339 cs
->control_state
= mc
;
342 mutex_unlock(&cs
->mutex
);
347 static int if_write(struct tty_struct
*tty
, const unsigned char *buf
, int count
)
349 struct cardstate
*cs
;
350 int retval
= -ENODEV
;
352 cs
= (struct cardstate
*) tty
->driver_data
;
354 pr_err("%s: no cardstate\n", __func__
);
358 gig_dbg(DEBUG_IF
, "%u: %s()", cs
->minor_index
, __func__
);
360 if (mutex_lock_interruptible(&cs
->mutex
))
361 return -ERESTARTSYS
; // FIXME -EINTR?
364 dev_warn(cs
->dev
, "%s: device not opened\n", __func__
);
365 else if (cs
->mstate
!= MS_LOCKED
) {
366 dev_warn(cs
->dev
, "can't write to unlocked device\n");
368 } else if (!cs
->connected
) {
369 gig_dbg(DEBUG_ANY
, "can't write to unplugged device");
370 retval
= -EBUSY
; //FIXME
372 retval
= cs
->ops
->write_cmd(cs
, buf
, count
,
373 &cs
->if_wake_tasklet
);
376 mutex_unlock(&cs
->mutex
);
381 static int if_write_room(struct tty_struct
*tty
)
383 struct cardstate
*cs
;
384 int retval
= -ENODEV
;
386 cs
= (struct cardstate
*) tty
->driver_data
;
388 pr_err("%s: no cardstate\n", __func__
);
392 gig_dbg(DEBUG_IF
, "%u: %s()", cs
->minor_index
, __func__
);
394 if (mutex_lock_interruptible(&cs
->mutex
))
395 return -ERESTARTSYS
; // FIXME -EINTR?
398 dev_warn(cs
->dev
, "%s: device not opened\n", __func__
);
399 else if (cs
->mstate
!= MS_LOCKED
) {
400 dev_warn(cs
->dev
, "can't write to unlocked device\n");
402 } else if (!cs
->connected
) {
403 gig_dbg(DEBUG_ANY
, "can't write to unplugged device");
404 retval
= -EBUSY
; //FIXME
406 retval
= cs
->ops
->write_room(cs
);
408 mutex_unlock(&cs
->mutex
);
413 static int if_chars_in_buffer(struct tty_struct
*tty
)
415 struct cardstate
*cs
;
416 int retval
= -ENODEV
;
418 cs
= (struct cardstate
*) tty
->driver_data
;
420 pr_err("%s: no cardstate\n", __func__
);
424 gig_dbg(DEBUG_IF
, "%u: %s()", cs
->minor_index
, __func__
);
426 if (mutex_lock_interruptible(&cs
->mutex
))
427 return -ERESTARTSYS
; // FIXME -EINTR?
430 dev_warn(cs
->dev
, "%s: device not opened\n", __func__
);
431 else if (cs
->mstate
!= MS_LOCKED
) {
432 dev_warn(cs
->dev
, "can't write to unlocked device\n");
434 } else if (!cs
->connected
) {
435 gig_dbg(DEBUG_ANY
, "can't write to unplugged device");
436 retval
= -EBUSY
; //FIXME
438 retval
= cs
->ops
->chars_in_buffer(cs
);
440 mutex_unlock(&cs
->mutex
);
445 static void if_throttle(struct tty_struct
*tty
)
447 struct cardstate
*cs
;
449 cs
= (struct cardstate
*) tty
->driver_data
;
451 pr_err("%s: no cardstate\n", __func__
);
455 gig_dbg(DEBUG_IF
, "%u: %s()", cs
->minor_index
, __func__
);
457 mutex_lock(&cs
->mutex
);
460 dev_warn(cs
->dev
, "%s: device not opened\n", __func__
);
465 mutex_unlock(&cs
->mutex
);
468 static void if_unthrottle(struct tty_struct
*tty
)
470 struct cardstate
*cs
;
472 cs
= (struct cardstate
*) tty
->driver_data
;
474 pr_err("%s: no cardstate\n", __func__
);
478 gig_dbg(DEBUG_IF
, "%u: %s()", cs
->minor_index
, __func__
);
480 mutex_lock(&cs
->mutex
);
483 dev_warn(cs
->dev
, "%s: device not opened\n", __func__
);
488 mutex_unlock(&cs
->mutex
);
491 static void if_set_termios(struct tty_struct
*tty
, struct ktermios
*old
)
493 struct cardstate
*cs
;
496 unsigned int old_cflag
;
497 unsigned int control_state
, new_state
;
499 cs
= (struct cardstate
*) tty
->driver_data
;
501 pr_err("%s: no cardstate\n", __func__
);
505 gig_dbg(DEBUG_IF
, "%u: %s()", cs
->minor_index
, __func__
);
507 mutex_lock(&cs
->mutex
);
509 if (!cs
->open_count
) {
510 dev_warn(cs
->dev
, "%s: device not opened\n", __func__
);
514 if (!cs
->connected
) {
515 gig_dbg(DEBUG_ANY
, "can't communicate with unplugged device");
519 // stolen from mct_u232.c
520 iflag
= tty
->termios
->c_iflag
;
521 cflag
= tty
->termios
->c_cflag
;
522 old_cflag
= old
? old
->c_cflag
: cflag
; //FIXME?
523 gig_dbg(DEBUG_IF
, "%u: iflag %x cflag %x old %x",
524 cs
->minor_index
, iflag
, cflag
, old_cflag
);
526 /* get a local copy of the current port settings */
527 control_state
= cs
->control_state
;
531 * Do not attempt to cache old rates and skip settings,
532 * disconnects screw such tricks up completely.
533 * Premature optimization is the root of all evil.
536 /* reassert DTR and (maybe) RTS on transition from B0 */
537 if ((old_cflag
& CBAUD
) == B0
) {
538 new_state
= control_state
| TIOCM_DTR
;
539 /* don't set RTS if using hardware flow control */
540 if (!(old_cflag
& CRTSCTS
))
541 new_state
|= TIOCM_RTS
;
542 gig_dbg(DEBUG_IF
, "%u: from B0 - set DTR%s",
544 (new_state
& TIOCM_RTS
) ? " only" : "/RTS");
545 cs
->ops
->set_modem_ctrl(cs
, control_state
, new_state
);
546 control_state
= new_state
;
549 cs
->ops
->baud_rate(cs
, cflag
& CBAUD
);
551 if ((cflag
& CBAUD
) == B0
) {
552 /* Drop RTS and DTR */
553 gig_dbg(DEBUG_IF
, "%u: to B0 - drop DTR/RTS", cs
->minor_index
);
554 new_state
= control_state
& ~(TIOCM_DTR
| TIOCM_RTS
);
555 cs
->ops
->set_modem_ctrl(cs
, control_state
, new_state
);
556 control_state
= new_state
;
560 * Update line control register (LCR)
563 cs
->ops
->set_line_ctrl(cs
, cflag
);
565 /* save off the modified port settings */
566 cs
->control_state
= control_state
;
569 mutex_unlock(&cs
->mutex
);
573 /* wakeup tasklet for the write operation */
574 static void if_wake(unsigned long data
)
576 struct cardstate
*cs
= (struct cardstate
*) data
;
582 /*** interface to common ***/
584 void gigaset_if_init(struct cardstate
*cs
)
586 struct gigaset_driver
*drv
;
592 tasklet_init(&cs
->if_wake_tasklet
, &if_wake
, (unsigned long) cs
);
594 mutex_lock(&cs
->mutex
);
595 cs
->tty_dev
= tty_register_device(drv
->tty
, cs
->minor_index
, NULL
);
597 if (!IS_ERR(cs
->tty_dev
))
598 dev_set_drvdata(cs
->tty_dev
, cs
);
601 "could not register device to the tty subsystem\n");
604 mutex_unlock(&cs
->mutex
);
607 void gigaset_if_free(struct cardstate
*cs
)
609 struct gigaset_driver
*drv
;
615 tasklet_disable(&cs
->if_wake_tasklet
);
616 tasklet_kill(&cs
->if_wake_tasklet
);
618 tty_unregister_device(drv
->tty
, cs
->minor_index
);
621 void gigaset_if_receive(struct cardstate
*cs
,
622 unsigned char *buffer
, size_t len
)
625 struct tty_struct
*tty
;
627 spin_lock_irqsave(&cs
->lock
, flags
);
628 if ((tty
= cs
->tty
) == NULL
)
629 gig_dbg(DEBUG_ANY
, "receive on closed device");
631 tty_buffer_request_room(tty
, len
);
632 tty_insert_flip_string(tty
, buffer
, len
);
633 tty_flip_buffer_push(tty
);
635 spin_unlock_irqrestore(&cs
->lock
, flags
);
637 EXPORT_SYMBOL_GPL(gigaset_if_receive
);
639 /* gigaset_if_initdriver
640 * Initialize tty interface.
643 * procname Name of the driver (e.g. for /proc/tty/drivers)
644 * devname Name of the device files (prefix without minor number)
646 void gigaset_if_initdriver(struct gigaset_driver
*drv
, const char *procname
,
649 unsigned minors
= drv
->minors
;
651 struct tty_driver
*tty
;
655 if ((drv
->tty
= alloc_tty_driver(minors
)) == NULL
)
659 tty
->magic
= TTY_DRIVER_MAGIC
,
660 tty
->major
= GIG_MAJOR
,
661 tty
->type
= TTY_DRIVER_TYPE_SERIAL
,
662 tty
->subtype
= SERIAL_TYPE_NORMAL
,
663 tty
->flags
= TTY_DRIVER_REAL_RAW
| TTY_DRIVER_DYNAMIC_DEV
;
665 tty
->driver_name
= procname
;
667 tty
->minor_start
= drv
->minor
;
668 tty
->num
= drv
->minors
;
670 tty
->owner
= THIS_MODULE
;
672 tty
->init_termios
= tty_std_termios
; //FIXME
673 tty
->init_termios
.c_cflag
= B9600
| CS8
| CREAD
| HUPCL
| CLOCAL
; //FIXME
674 tty_set_operations(tty
, &if_ops
);
676 ret
= tty_register_driver(tty
);
678 pr_err("error %d registering tty driver\n", ret
);
681 gig_dbg(DEBUG_IF
, "tty driver initialized");
686 pr_err("out of memory\n");
689 put_tty_driver(drv
->tty
);
692 void gigaset_if_freedriver(struct gigaset_driver
*drv
)
698 tty_unregister_driver(drv
->tty
);
699 put_tty_driver(drv
->tty
);