]>
git.proxmox.com Git - mirror_ubuntu-eoan-kernel.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_flip.h>
17 #include <linux/module.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
,
48 gigaset_schedule_event(cs
);
50 wait_event(cs
->waitqueue
, !cs
->waiting
);
52 if (cs
->cmd_result
>= 0) {
53 *arg
= cs
->cmd_result
;
57 return cs
->cmd_result
;
60 static int if_version(struct cardstate
*cs
, unsigned arg
[4])
62 static const unsigned version
[4] = GIG_VERSION
;
63 static const unsigned compat
[4] = GIG_COMPAT
;
64 unsigned cmd
= arg
[0];
66 gig_dbg(DEBUG_IF
, "%u: if_version (%d)", cs
->minor_index
, cmd
);
70 memcpy(arg
, version
, sizeof version
);
73 memcpy(arg
, compat
, sizeof compat
);
77 if (!gigaset_add_event(cs
, &cs
->at_state
, EV_IF_VER
,
82 gigaset_schedule_event(cs
);
84 wait_event(cs
->waitqueue
, !cs
->waiting
);
86 if (cs
->cmd_result
>= 0)
89 return cs
->cmd_result
;
95 static int if_config(struct cardstate
*cs
, int *arg
)
97 gig_dbg(DEBUG_IF
, "%u: if_config (%d)", cs
->minor_index
, *arg
);
102 if (cs
->mstate
!= MS_LOCKED
)
105 if (!cs
->connected
) {
106 pr_err("%s: not connected\n", __func__
);
111 return gigaset_enterconfigmode(cs
);
114 /*** the terminal driver ***/
116 static int if_open(struct tty_struct
*tty
, struct file
*filp
)
118 struct cardstate
*cs
;
120 gig_dbg(DEBUG_IF
, "%d+%d: %s()",
121 tty
->driver
->minor_start
, tty
->index
, __func__
);
123 cs
= gigaset_get_cs_by_tty(tty
);
124 if (!cs
|| !try_module_get(cs
->driver
->owner
))
127 if (mutex_lock_interruptible(&cs
->mutex
)) {
128 module_put(cs
->driver
->owner
);
131 tty
->driver_data
= cs
;
135 if (cs
->port
.count
== 1) {
136 tty_port_tty_set(&cs
->port
, tty
);
137 cs
->port
.low_latency
= 1;
140 mutex_unlock(&cs
->mutex
);
144 static void if_close(struct tty_struct
*tty
, struct file
*filp
)
146 struct cardstate
*cs
= tty
->driver_data
;
148 if (!cs
) { /* happens if we didn't find cs in open */
149 gig_dbg(DEBUG_IF
, "%s: no cardstate", __func__
);
153 gig_dbg(DEBUG_IF
, "%u: %s()", cs
->minor_index
, __func__
);
155 mutex_lock(&cs
->mutex
);
158 gig_dbg(DEBUG_IF
, "not connected"); /* nothing to do */
159 else if (!cs
->port
.count
)
160 dev_warn(cs
->dev
, "%s: device not opened\n", __func__
);
161 else if (!--cs
->port
.count
)
162 tty_port_tty_set(&cs
->port
, NULL
);
164 mutex_unlock(&cs
->mutex
);
166 module_put(cs
->driver
->owner
);
169 static int if_ioctl(struct tty_struct
*tty
,
170 unsigned int cmd
, unsigned long arg
)
172 struct cardstate
*cs
= tty
->driver_data
;
173 int retval
= -ENODEV
;
175 unsigned char buf
[6];
178 gig_dbg(DEBUG_IF
, "%u: %s(0x%x)", cs
->minor_index
, __func__
, cmd
);
180 if (mutex_lock_interruptible(&cs
->mutex
))
183 if (!cs
->connected
) {
184 gig_dbg(DEBUG_IF
, "not connected");
190 retval
= get_user(int_arg
, (int __user
*) arg
);
192 retval
= if_lock(cs
, &int_arg
);
194 retval
= put_user(int_arg
, (int __user
*) arg
);
197 retval
= get_user(int_arg
, (int __user
*) arg
);
199 retval
= if_config(cs
, &int_arg
);
201 retval
= put_user(int_arg
, (int __user
*) arg
);
203 case GIGASET_BRKCHARS
:
204 retval
= copy_from_user(&buf
,
205 (const unsigned char __user
*) arg
, 6)
208 gigaset_dbg_buffer(DEBUG_IF
, "GIGASET_BRKCHARS",
210 retval
= cs
->ops
->brkchars(cs
, buf
);
213 case GIGASET_VERSION
:
214 retval
= copy_from_user(version
,
215 (unsigned __user
*) arg
, sizeof version
)
218 retval
= if_version(cs
, version
);
220 retval
= copy_to_user((unsigned __user
*) arg
,
221 version
, sizeof version
)
225 gig_dbg(DEBUG_IF
, "%s: arg not supported - 0x%04x",
227 retval
= -ENOIOCTLCMD
;
231 mutex_unlock(&cs
->mutex
);
237 static long if_compat_ioctl(struct tty_struct
*tty
,
238 unsigned int cmd
, unsigned long arg
)
240 return if_ioctl(tty
, cmd
, (unsigned long)compat_ptr(arg
));
244 static int if_tiocmget(struct tty_struct
*tty
)
246 struct cardstate
*cs
= tty
->driver_data
;
249 gig_dbg(DEBUG_IF
, "%u: %s()", cs
->minor_index
, __func__
);
251 if (mutex_lock_interruptible(&cs
->mutex
))
254 retval
= cs
->control_state
& (TIOCM_RTS
| TIOCM_DTR
);
256 mutex_unlock(&cs
->mutex
);
261 static int if_tiocmset(struct tty_struct
*tty
,
262 unsigned int set
, unsigned int clear
)
264 struct cardstate
*cs
= tty
->driver_data
;
268 gig_dbg(DEBUG_IF
, "%u: %s(0x%x, 0x%x)",
269 cs
->minor_index
, __func__
, set
, clear
);
271 if (mutex_lock_interruptible(&cs
->mutex
))
274 if (!cs
->connected
) {
275 gig_dbg(DEBUG_IF
, "not connected");
278 mc
= (cs
->control_state
| set
) & ~clear
& (TIOCM_RTS
| TIOCM_DTR
);
279 retval
= cs
->ops
->set_modem_ctrl(cs
, cs
->control_state
, mc
);
280 cs
->control_state
= mc
;
283 mutex_unlock(&cs
->mutex
);
288 static int if_write(struct tty_struct
*tty
, const unsigned char *buf
, int count
)
290 struct cardstate
*cs
= tty
->driver_data
;
294 gig_dbg(DEBUG_IF
, "%u: %s()", cs
->minor_index
, __func__
);
296 if (mutex_lock_interruptible(&cs
->mutex
))
299 if (!cs
->connected
) {
300 gig_dbg(DEBUG_IF
, "not connected");
304 if (cs
->mstate
!= MS_LOCKED
) {
305 dev_warn(cs
->dev
, "can't write to unlocked device\n");
315 cb
= kmalloc(sizeof(struct cmdbuf_t
) + count
, GFP_KERNEL
);
317 dev_err(cs
->dev
, "%s: out of memory\n", __func__
);
322 memcpy(cb
->buf
, buf
, count
);
326 cb
->wake_tasklet
= &cs
->if_wake_tasklet
;
327 retval
= cs
->ops
->write_cmd(cs
, cb
);
329 mutex_unlock(&cs
->mutex
);
333 static int if_write_room(struct tty_struct
*tty
)
335 struct cardstate
*cs
= tty
->driver_data
;
338 gig_dbg(DEBUG_IF
, "%u: %s()", cs
->minor_index
, __func__
);
340 if (mutex_lock_interruptible(&cs
->mutex
))
343 if (!cs
->connected
) {
344 gig_dbg(DEBUG_IF
, "not connected");
346 } else if (cs
->mstate
!= MS_LOCKED
) {
347 dev_warn(cs
->dev
, "can't write to unlocked device\n");
350 retval
= cs
->ops
->write_room(cs
);
352 mutex_unlock(&cs
->mutex
);
357 static int if_chars_in_buffer(struct tty_struct
*tty
)
359 struct cardstate
*cs
= tty
->driver_data
;
362 gig_dbg(DEBUG_IF
, "%u: %s()", cs
->minor_index
, __func__
);
364 mutex_lock(&cs
->mutex
);
367 gig_dbg(DEBUG_IF
, "not connected");
368 else if (cs
->mstate
!= MS_LOCKED
)
369 dev_warn(cs
->dev
, "can't write to unlocked device\n");
371 retval
= cs
->ops
->chars_in_buffer(cs
);
373 mutex_unlock(&cs
->mutex
);
378 static void if_throttle(struct tty_struct
*tty
)
380 struct cardstate
*cs
= tty
->driver_data
;
382 gig_dbg(DEBUG_IF
, "%u: %s()", cs
->minor_index
, __func__
);
384 mutex_lock(&cs
->mutex
);
387 gig_dbg(DEBUG_IF
, "not connected"); /* nothing to do */
389 gig_dbg(DEBUG_IF
, "%s: not implemented\n", __func__
);
391 mutex_unlock(&cs
->mutex
);
394 static void if_unthrottle(struct tty_struct
*tty
)
396 struct cardstate
*cs
= tty
->driver_data
;
398 gig_dbg(DEBUG_IF
, "%u: %s()", cs
->minor_index
, __func__
);
400 mutex_lock(&cs
->mutex
);
403 gig_dbg(DEBUG_IF
, "not connected"); /* nothing to do */
405 gig_dbg(DEBUG_IF
, "%s: not implemented\n", __func__
);
407 mutex_unlock(&cs
->mutex
);
410 static void if_set_termios(struct tty_struct
*tty
, struct ktermios
*old
)
412 struct cardstate
*cs
= tty
->driver_data
;
415 unsigned int old_cflag
;
416 unsigned int control_state
, new_state
;
418 gig_dbg(DEBUG_IF
, "%u: %s()", cs
->minor_index
, __func__
);
420 mutex_lock(&cs
->mutex
);
422 if (!cs
->connected
) {
423 gig_dbg(DEBUG_IF
, "not connected");
427 iflag
= tty
->termios
.c_iflag
;
428 cflag
= tty
->termios
.c_cflag
;
429 old_cflag
= old
? old
->c_cflag
: cflag
;
430 gig_dbg(DEBUG_IF
, "%u: iflag %x cflag %x old %x",
431 cs
->minor_index
, iflag
, cflag
, old_cflag
);
433 /* get a local copy of the current port settings */
434 control_state
= cs
->control_state
;
438 * Do not attempt to cache old rates and skip settings,
439 * disconnects screw such tricks up completely.
440 * Premature optimization is the root of all evil.
443 /* reassert DTR and (maybe) RTS on transition from B0 */
444 if ((old_cflag
& CBAUD
) == B0
) {
445 new_state
= control_state
| TIOCM_DTR
;
446 /* don't set RTS if using hardware flow control */
447 if (!(old_cflag
& CRTSCTS
))
448 new_state
|= TIOCM_RTS
;
449 gig_dbg(DEBUG_IF
, "%u: from B0 - set DTR%s",
451 (new_state
& TIOCM_RTS
) ? " only" : "/RTS");
452 cs
->ops
->set_modem_ctrl(cs
, control_state
, new_state
);
453 control_state
= new_state
;
456 cs
->ops
->baud_rate(cs
, cflag
& CBAUD
);
458 if ((cflag
& CBAUD
) == B0
) {
459 /* Drop RTS and DTR */
460 gig_dbg(DEBUG_IF
, "%u: to B0 - drop DTR/RTS", cs
->minor_index
);
461 new_state
= control_state
& ~(TIOCM_DTR
| TIOCM_RTS
);
462 cs
->ops
->set_modem_ctrl(cs
, control_state
, new_state
);
463 control_state
= new_state
;
467 * Update line control register (LCR)
470 cs
->ops
->set_line_ctrl(cs
, cflag
);
472 /* save off the modified port settings */
473 cs
->control_state
= control_state
;
476 mutex_unlock(&cs
->mutex
);
479 static const struct tty_operations if_ops
= {
484 .compat_ioctl
= if_compat_ioctl
,
487 .write_room
= if_write_room
,
488 .chars_in_buffer
= if_chars_in_buffer
,
489 .set_termios
= if_set_termios
,
490 .throttle
= if_throttle
,
491 .unthrottle
= if_unthrottle
,
492 .tiocmget
= if_tiocmget
,
493 .tiocmset
= if_tiocmset
,
497 /* wakeup tasklet for the write operation */
498 static void if_wake(unsigned long data
)
500 struct cardstate
*cs
= (struct cardstate
*)data
;
502 tty_port_tty_wakeup(&cs
->port
);
505 /*** interface to common ***/
507 void gigaset_if_init(struct cardstate
*cs
)
509 struct gigaset_driver
*drv
;
515 tasklet_init(&cs
->if_wake_tasklet
, if_wake
, (unsigned long) cs
);
517 mutex_lock(&cs
->mutex
);
518 cs
->tty_dev
= tty_port_register_device(&cs
->port
, drv
->tty
,
519 cs
->minor_index
, NULL
);
521 if (!IS_ERR(cs
->tty_dev
))
522 dev_set_drvdata(cs
->tty_dev
, cs
);
524 pr_warning("could not register device to the tty subsystem\n");
527 mutex_unlock(&cs
->mutex
);
530 void gigaset_if_free(struct cardstate
*cs
)
532 struct gigaset_driver
*drv
;
538 tasklet_disable(&cs
->if_wake_tasklet
);
539 tasklet_kill(&cs
->if_wake_tasklet
);
541 tty_unregister_device(drv
->tty
, cs
->minor_index
);
545 * gigaset_if_receive() - pass a received block of data to the tty device
546 * @cs: device descriptor structure.
547 * @buffer: received data.
548 * @len: number of bytes received.
550 * Called by asyncdata/isocdata if a block of data received from the
551 * device must be sent to userspace through the ttyG* device.
553 void gigaset_if_receive(struct cardstate
*cs
,
554 unsigned char *buffer
, size_t len
)
556 tty_insert_flip_string(&cs
->port
, buffer
, len
);
557 tty_flip_buffer_push(&cs
->port
);
559 EXPORT_SYMBOL_GPL(gigaset_if_receive
);
561 /* gigaset_if_initdriver
562 * Initialize tty interface.
565 * procname Name of the driver (e.g. for /proc/tty/drivers)
566 * devname Name of the device files (prefix without minor number)
568 void gigaset_if_initdriver(struct gigaset_driver
*drv
, const char *procname
,
572 struct tty_driver
*tty
;
576 drv
->tty
= tty
= alloc_tty_driver(drv
->minors
);
580 tty
->type
= TTY_DRIVER_TYPE_SERIAL
;
581 tty
->subtype
= SERIAL_TYPE_NORMAL
;
582 tty
->flags
= TTY_DRIVER_REAL_RAW
| TTY_DRIVER_DYNAMIC_DEV
;
584 tty
->driver_name
= procname
;
586 tty
->minor_start
= drv
->minor
;
588 tty
->init_termios
= tty_std_termios
;
589 tty
->init_termios
.c_cflag
= B9600
| CS8
| CREAD
| HUPCL
| CLOCAL
;
590 tty_set_operations(tty
, &if_ops
);
592 ret
= tty_register_driver(tty
);
594 pr_err("error %d registering tty driver\n", ret
);
597 gig_dbg(DEBUG_IF
, "tty driver initialized");
602 pr_err("out of memory\n");
605 put_tty_driver(drv
->tty
);
608 void gigaset_if_freedriver(struct gigaset_driver
*drv
)
614 tty_unregister_driver(drv
->tty
);
615 put_tty_driver(drv
->tty
);