2 * Stuff used by all variants of the driver
4 * Copyright (c) 2001 by Stefan Eilers,
5 * Hansjoerg Lipp <hjlipp@web.de>,
6 * Tilman Schmidt <tilman@imap.cc>.
8 * =====================================================================
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation; either version 2 of
12 * the License, or (at your option) any later version.
13 * =====================================================================
17 #include <linux/module.h>
18 #include <linux/moduleparam.h>
20 /* Version Information */
21 #define DRIVER_AUTHOR "Hansjoerg Lipp <hjlipp@web.de>, Tilman Schmidt <tilman@imap.cc>, Stefan Eilers"
22 #define DRIVER_DESC "Driver for Gigaset 307x"
24 #ifdef CONFIG_GIGASET_DEBUG
25 #define DRIVER_DESC_DEBUG " (debug build)"
27 #define DRIVER_DESC_DEBUG ""
30 /* Module parameters */
31 int gigaset_debuglevel;
32 EXPORT_SYMBOL_GPL(gigaset_debuglevel);
33 module_param_named(debug, gigaset_debuglevel, int, S_IRUGO | S_IWUSR);
34 MODULE_PARM_DESC(debug, "debug level");
36 /* driver state flags */
37 #define VALID_MINOR 0x01
41 * gigaset_dbg_buffer() - dump data in ASCII and hex for debugging
42 * @level: debugging level.
43 * @msg: message prefix.
44 * @len: number of bytes to dump.
47 * If the current debugging level includes one of the bits set in @level,
48 * @len bytes starting at @buf are logged to dmesg at KERN_DEBUG prio,
49 * prefixed by the text @msg.
51 void gigaset_dbg_buffer(enum debuglevel level, const unsigned char *msg,
52 size_t len, const unsigned char *buf)
54 unsigned char outbuf[80];
56 size_t space = sizeof outbuf - 1;
57 unsigned char *out = outbuf;
62 if (c == '~' || c == '^' || c == '\\') {
73 if (c < 0x20 || c == 0x7f) {
85 gig_dbg(level, "%s (%u bytes): %s", msg, (unsigned) len, outbuf);
87 EXPORT_SYMBOL_GPL(gigaset_dbg_buffer);
89 static int setflags(struct cardstate *cs, unsigned flags, unsigned delay)
93 r = cs->ops->set_modem_ctrl(cs, cs->control_state, flags);
94 cs->control_state = flags;
99 set_current_state(TASK_INTERRUPTIBLE);
100 schedule_timeout(delay * HZ / 1000);
106 int gigaset_enterconfigmode(struct cardstate *cs)
110 cs->control_state = TIOCM_RTS;
112 r = setflags(cs, TIOCM_DTR, 200);
115 r = setflags(cs, 0, 200);
118 for (i = 0; i < 5; ++i) {
119 r = setflags(cs, TIOCM_RTS, 100);
122 r = setflags(cs, 0, 100);
126 r = setflags(cs, TIOCM_RTS | TIOCM_DTR, 800);
133 dev_err(cs->dev, "error %d on setuartbits\n", -r);
134 cs->control_state = TIOCM_RTS | TIOCM_DTR;
135 cs->ops->set_modem_ctrl(cs, 0, TIOCM_RTS | TIOCM_DTR);
140 static int test_timeout(struct at_state_t *at_state)
142 if (!at_state->timer_expires)
145 if (--at_state->timer_expires) {
146 gig_dbg(DEBUG_MCMD, "decreased timer of %p to %lu",
147 at_state, at_state->timer_expires);
151 gigaset_add_event(at_state->cs, at_state, EV_TIMEOUT, NULL,
152 at_state->timer_index, NULL);
156 static void timer_tick(struct timer_list *t)
158 struct cardstate *cs = from_timer(cs, t, timer);
161 struct at_state_t *at_state;
164 spin_lock_irqsave(&cs->lock, flags);
166 for (channel = 0; channel < cs->channels; ++channel)
167 if (test_timeout(&cs->bcs[channel].at_state))
170 if (test_timeout(&cs->at_state))
173 list_for_each_entry(at_state, &cs->temp_at_states, list)
174 if (test_timeout(at_state))
178 mod_timer(&cs->timer, jiffies + msecs_to_jiffies(GIG_TICK));
180 gig_dbg(DEBUG_EVENT, "scheduling timeout");
181 tasklet_schedule(&cs->event_tasklet);
185 spin_unlock_irqrestore(&cs->lock, flags);
188 int gigaset_get_channel(struct bc_state *bcs)
192 spin_lock_irqsave(&bcs->cs->lock, flags);
193 if (bcs->use_count || !try_module_get(bcs->cs->driver->owner)) {
194 gig_dbg(DEBUG_CHANNEL, "could not allocate channel %d",
196 spin_unlock_irqrestore(&bcs->cs->lock, flags);
201 gig_dbg(DEBUG_CHANNEL, "allocated channel %d", bcs->channel);
202 spin_unlock_irqrestore(&bcs->cs->lock, flags);
206 struct bc_state *gigaset_get_free_channel(struct cardstate *cs)
211 spin_lock_irqsave(&cs->lock, flags);
212 if (!try_module_get(cs->driver->owner)) {
213 gig_dbg(DEBUG_CHANNEL,
214 "could not get module for allocating channel");
215 spin_unlock_irqrestore(&cs->lock, flags);
218 for (i = 0; i < cs->channels; ++i)
219 if (!cs->bcs[i].use_count) {
220 ++cs->bcs[i].use_count;
222 spin_unlock_irqrestore(&cs->lock, flags);
223 gig_dbg(DEBUG_CHANNEL, "allocated channel %d", i);
226 module_put(cs->driver->owner);
227 spin_unlock_irqrestore(&cs->lock, flags);
228 gig_dbg(DEBUG_CHANNEL, "no free channel");
232 void gigaset_free_channel(struct bc_state *bcs)
236 spin_lock_irqsave(&bcs->cs->lock, flags);
238 gig_dbg(DEBUG_CHANNEL, "could not free channel %d",
240 spin_unlock_irqrestore(&bcs->cs->lock, flags);
245 module_put(bcs->cs->driver->owner);
246 gig_dbg(DEBUG_CHANNEL, "freed channel %d", bcs->channel);
247 spin_unlock_irqrestore(&bcs->cs->lock, flags);
250 int gigaset_get_channels(struct cardstate *cs)
255 spin_lock_irqsave(&cs->lock, flags);
256 for (i = 0; i < cs->channels; ++i)
257 if (cs->bcs[i].use_count) {
258 spin_unlock_irqrestore(&cs->lock, flags);
259 gig_dbg(DEBUG_CHANNEL,
260 "could not allocate all channels");
263 for (i = 0; i < cs->channels; ++i)
264 ++cs->bcs[i].use_count;
265 spin_unlock_irqrestore(&cs->lock, flags);
267 gig_dbg(DEBUG_CHANNEL, "allocated all channels");
272 void gigaset_free_channels(struct cardstate *cs)
277 gig_dbg(DEBUG_CHANNEL, "unblocking all channels");
278 spin_lock_irqsave(&cs->lock, flags);
279 for (i = 0; i < cs->channels; ++i)
280 --cs->bcs[i].use_count;
281 spin_unlock_irqrestore(&cs->lock, flags);
284 void gigaset_block_channels(struct cardstate *cs)
289 gig_dbg(DEBUG_CHANNEL, "blocking all channels");
290 spin_lock_irqsave(&cs->lock, flags);
291 for (i = 0; i < cs->channels; ++i)
292 ++cs->bcs[i].use_count;
293 spin_unlock_irqrestore(&cs->lock, flags);
296 static void clear_events(struct cardstate *cs)
302 spin_lock_irqsave(&cs->ev_lock, flags);
307 while (tail != head) {
308 ev = cs->events + head;
310 head = (head + 1) % MAX_EVENTS;
315 spin_unlock_irqrestore(&cs->ev_lock, flags);
319 * gigaset_add_event() - add event to device event queue
320 * @cs: device descriptor structure.
321 * @at_state: connection state structure.
323 * @ptr: pointer parameter for event.
324 * @parameter: integer parameter for event.
325 * @arg: pointer parameter for event.
327 * Allocate an event queue entry from the device's event queue, and set it up
328 * with the parameters given.
330 * Return value: added event
332 struct event_t *gigaset_add_event(struct cardstate *cs,
333 struct at_state_t *at_state, int type,
334 void *ptr, int parameter, void *arg)
338 struct event_t *event = NULL;
340 gig_dbg(DEBUG_EVENT, "queueing event %d", type);
342 spin_lock_irqsave(&cs->ev_lock, flags);
345 next = (tail + 1) % MAX_EVENTS;
346 if (unlikely(next == cs->ev_head))
347 dev_err(cs->dev, "event queue full\n");
349 event = cs->events + tail;
351 event->at_state = at_state;
355 event->parameter = parameter;
359 spin_unlock_irqrestore(&cs->ev_lock, flags);
363 EXPORT_SYMBOL_GPL(gigaset_add_event);
365 static void clear_at_state(struct at_state_t *at_state)
369 for (i = 0; i < STR_NUM; ++i) {
370 kfree(at_state->str_var[i]);
371 at_state->str_var[i] = NULL;
375 static void dealloc_temp_at_states(struct cardstate *cs)
377 struct at_state_t *cur, *next;
379 list_for_each_entry_safe(cur, next, &cs->temp_at_states, list) {
380 list_del(&cur->list);
386 static void gigaset_freebcs(struct bc_state *bcs)
390 gig_dbg(DEBUG_INIT, "freeing bcs[%d]->hw", bcs->channel);
391 bcs->cs->ops->freebcshw(bcs);
393 gig_dbg(DEBUG_INIT, "clearing bcs[%d]->at_state", bcs->channel);
394 clear_at_state(&bcs->at_state);
395 gig_dbg(DEBUG_INIT, "freeing bcs[%d]->skb", bcs->channel);
396 dev_kfree_skb(bcs->rx_skb);
399 for (i = 0; i < AT_NUM; ++i) {
400 kfree(bcs->commands[i]);
401 bcs->commands[i] = NULL;
405 static struct cardstate *alloc_cs(struct gigaset_driver *drv)
409 struct cardstate *cs;
410 struct cardstate *ret = NULL;
412 spin_lock_irqsave(&drv->lock, flags);
415 for (i = 0; i < drv->minors; ++i) {
417 if (!(cs->flags & VALID_MINOR)) {
418 cs->flags = VALID_MINOR;
424 spin_unlock_irqrestore(&drv->lock, flags);
428 static void free_cs(struct cardstate *cs)
433 static void make_valid(struct cardstate *cs, unsigned mask)
436 struct gigaset_driver *drv = cs->driver;
437 spin_lock_irqsave(&drv->lock, flags);
439 spin_unlock_irqrestore(&drv->lock, flags);
442 static void make_invalid(struct cardstate *cs, unsigned mask)
445 struct gigaset_driver *drv = cs->driver;
446 spin_lock_irqsave(&drv->lock, flags);
448 spin_unlock_irqrestore(&drv->lock, flags);
452 * gigaset_freecs() - free all associated ressources of a device
453 * @cs: device descriptor structure.
455 * Stops all tasklets and timers, unregisters the device from all
456 * subsystems it was registered to, deallocates the device structure
457 * @cs and all structures referenced from it.
458 * Operations on the device should be stopped before calling this.
460 void gigaset_freecs(struct cardstate *cs)
468 mutex_lock(&cs->mutex);
470 spin_lock_irqsave(&cs->lock, flags);
472 spin_unlock_irqrestore(&cs->lock, flags); /* event handler and timer are
473 not rescheduled below */
475 tasklet_kill(&cs->event_tasklet);
476 del_timer_sync(&cs->timer);
478 switch (cs->cs_init) {
480 /* clear B channel structures */
481 for (i = 0; i < cs->channels; ++i) {
482 gig_dbg(DEBUG_INIT, "clearing bcs[%d]", i);
483 gigaset_freebcs(cs->bcs + i);
486 /* clear device sysfs */
487 gigaset_free_dev_sysfs(cs);
491 gig_dbg(DEBUG_INIT, "clearing hw");
492 cs->ops->freecshw(cs);
495 case 2: /* error in initcshw */
496 /* Deregister from LL */
497 make_invalid(cs, VALID_ID);
498 gigaset_isdn_unregdev(cs);
501 case 1: /* error when registering to LL */
502 gig_dbg(DEBUG_INIT, "clearing at_state");
503 clear_at_state(&cs->at_state);
504 dealloc_temp_at_states(cs);
506 tty_port_destroy(&cs->port);
509 case 0: /* error in basic setup */
510 gig_dbg(DEBUG_INIT, "freeing inbuf");
515 mutex_unlock(&cs->mutex);
518 EXPORT_SYMBOL_GPL(gigaset_freecs);
520 void gigaset_at_init(struct at_state_t *at_state, struct bc_state *bcs,
521 struct cardstate *cs, int cid)
525 INIT_LIST_HEAD(&at_state->list);
526 at_state->waiting = 0;
527 at_state->getstring = 0;
528 at_state->pending_commands = 0;
529 at_state->timer_expires = 0;
530 at_state->timer_active = 0;
531 at_state->timer_index = 0;
532 at_state->seq_index = 0;
533 at_state->ConState = 0;
534 for (i = 0; i < STR_NUM; ++i)
535 at_state->str_var[i] = NULL;
536 at_state->int_var[VAR_ZDLE] = 0;
537 at_state->int_var[VAR_ZCTP] = -1;
538 at_state->int_var[VAR_ZSAU] = ZSAU_NULL;
543 at_state->replystruct = cs->tabnocid;
545 at_state->replystruct = cs->tabcid;
549 static void gigaset_inbuf_init(struct inbuf_t *inbuf, struct cardstate *cs)
550 /* inbuf->read must be allocated before! */
555 inbuf->inputstate = INS_command;
559 * gigaset_fill_inbuf() - append received data to input buffer
560 * @inbuf: buffer structure.
561 * @src: received data.
562 * @numbytes: number of bytes received.
564 * Return value: !=0 if some data was appended
566 int gigaset_fill_inbuf(struct inbuf_t *inbuf, const unsigned char *src,
569 unsigned n, head, tail, bytesleft;
571 gig_dbg(DEBUG_INTR, "received %u bytes", numbytes);
576 bytesleft = numbytes;
579 gig_dbg(DEBUG_INTR, "buffer state: %u -> %u", head, tail);
585 n = (RBUFSIZE - 1) - tail;
589 dev_err(inbuf->cs->dev,
590 "buffer overflow (%u bytes lost)\n",
596 memcpy(inbuf->data + tail, src, n);
598 tail = (tail + n) % RBUFSIZE;
601 gig_dbg(DEBUG_INTR, "setting tail to %u", tail);
603 return numbytes != bytesleft;
605 EXPORT_SYMBOL_GPL(gigaset_fill_inbuf);
607 /* Initialize the b-channel structure */
608 static int gigaset_initbcs(struct bc_state *bcs, struct cardstate *cs,
615 skb_queue_head_init(&bcs->squeue);
621 gig_dbg(DEBUG_INIT, "setting up bcs[%d]->at_state", channel);
622 gigaset_at_init(&bcs->at_state, bcs, cs, -1);
624 #ifdef CONFIG_GIGASET_DEBUG
630 bcs->rx_fcs = PPP_INITFCS;
632 bcs->channel = channel;
638 bcs->ignore = cs->ignoreframes;
640 for (i = 0; i < AT_NUM; ++i)
641 bcs->commands[i] = NULL;
643 spin_lock_init(&bcs->aplock);
645 bcs->apconnstate = 0;
647 gig_dbg(DEBUG_INIT, " setting up bcs[%d]->hw", channel);
648 return cs->ops->initbcshw(bcs);
652 * gigaset_initcs() - initialize device structure
653 * @drv: hardware driver the device belongs to
654 * @channels: number of B channels supported by device
655 * @onechannel: !=0 if B channel data and AT commands share one
656 * communication channel (M10x),
657 * ==0 if B channels have separate communication channels (base)
658 * @ignoreframes: number of frames to ignore after setting up B channel
659 * @cidmode: !=0: start in CallID mode
660 * @modulename: name of driver module for LL registration
662 * Allocate and initialize cardstate structure for Gigaset driver
663 * Calls hardware dependent gigaset_initcshw() function
664 * Calls B channel initialization function gigaset_initbcs() for each B channel
667 * pointer to cardstate structure
669 struct cardstate *gigaset_initcs(struct gigaset_driver *drv, int channels,
670 int onechannel, int ignoreframes,
671 int cidmode, const char *modulename)
673 struct cardstate *cs;
677 gig_dbg(DEBUG_INIT, "allocating cs");
680 pr_err("maximum number of devices exceeded\n");
685 cs->channels = channels;
686 cs->onechannel = onechannel;
687 cs->ignoreframes = ignoreframes;
688 INIT_LIST_HEAD(&cs->temp_at_states);
690 timer_setup(&cs->timer, timer_tick, 0);
691 spin_lock_init(&cs->ev_lock);
695 tasklet_init(&cs->event_tasklet, gigaset_handle_event,
697 tty_port_init(&cs->port);
698 cs->commands_pending = 0;
703 cs->cidmode = cidmode != 0;
704 cs->tabnocid = gigaset_tab_nocid;
705 cs->tabcid = gigaset_tab_cid;
707 init_waitqueue_head(&cs->waitqueue);
710 cs->mode = M_UNKNOWN;
711 cs->mstate = MS_UNINITIALIZED;
713 cs->bcs = kmalloc(channels * sizeof(struct bc_state), GFP_KERNEL);
714 cs->inbuf = kmalloc(sizeof(struct inbuf_t), GFP_KERNEL);
715 if (!cs->bcs || !cs->inbuf) {
716 pr_err("out of memory\n");
721 gig_dbg(DEBUG_INIT, "setting up at_state");
722 spin_lock_init(&cs->lock);
723 gigaset_at_init(&cs->at_state, NULL, cs, 0);
727 gig_dbg(DEBUG_INIT, "setting up inbuf");
728 gigaset_inbuf_init(cs->inbuf, cs);
733 gig_dbg(DEBUG_INIT, "setting up cmdbuf");
734 cs->cmdbuf = cs->lastcmdbuf = NULL;
735 spin_lock_init(&cs->cmdlock);
739 gig_dbg(DEBUG_INIT, "setting up iif");
740 if (gigaset_isdn_regdev(cs, modulename) < 0) {
741 pr_err("error registering ISDN device\n");
745 make_valid(cs, VALID_ID);
747 gig_dbg(DEBUG_INIT, "setting up hw");
748 if (cs->ops->initcshw(cs) < 0)
753 /* set up character device */
756 /* set up device sysfs */
757 gigaset_init_dev_sysfs(cs);
759 /* set up channel data structures */
760 for (i = 0; i < channels; ++i) {
761 gig_dbg(DEBUG_INIT, "setting up bcs[%d]", i);
762 if (gigaset_initbcs(cs->bcs + i, cs, i) < 0) {
763 pr_err("could not allocate channel %d data\n", i);
768 spin_lock_irqsave(&cs->lock, flags);
770 spin_unlock_irqrestore(&cs->lock, flags);
771 cs->timer.expires = jiffies + msecs_to_jiffies(GIG_TICK);
772 add_timer(&cs->timer);
774 gig_dbg(DEBUG_INIT, "cs initialized");
778 gig_dbg(DEBUG_INIT, "failed");
782 EXPORT_SYMBOL_GPL(gigaset_initcs);
784 /* ReInitialize the b-channel structure on hangup */
785 void gigaset_bcs_reinit(struct bc_state *bcs)
788 struct cardstate *cs = bcs->cs;
791 while ((skb = skb_dequeue(&bcs->squeue)) != NULL)
794 spin_lock_irqsave(&cs->lock, flags);
795 clear_at_state(&bcs->at_state);
796 bcs->at_state.ConState = 0;
797 bcs->at_state.timer_active = 0;
798 bcs->at_state.timer_expires = 0;
799 bcs->at_state.cid = -1; /* No CID defined */
800 spin_unlock_irqrestore(&cs->lock, flags);
804 #ifdef CONFIG_GIGASET_DEBUG
808 bcs->rx_fcs = PPP_INITFCS;
811 bcs->ignore = cs->ignoreframes;
812 dev_kfree_skb(bcs->rx_skb);
815 cs->ops->reinitbcshw(bcs);
818 static void cleanup_cs(struct cardstate *cs)
820 struct cmdbuf_t *cb, *tcb;
824 spin_lock_irqsave(&cs->lock, flags);
826 cs->mode = M_UNKNOWN;
827 cs->mstate = MS_UNINITIALIZED;
829 clear_at_state(&cs->at_state);
830 dealloc_temp_at_states(cs);
831 gigaset_at_init(&cs->at_state, NULL, cs, 0);
833 cs->inbuf->inputstate = INS_command;
843 cs->cmdbuf = cs->lastcmdbuf = NULL;
849 cs->commands_pending = 0;
852 spin_unlock_irqrestore(&cs->lock, flags);
854 for (i = 0; i < cs->channels; ++i) {
855 gigaset_freebcs(cs->bcs + i);
856 if (gigaset_initbcs(cs->bcs + i, cs, i) < 0)
857 pr_err("could not allocate channel %d data\n", i);
861 cs->cmd_result = -ENODEV;
863 wake_up_interruptible(&cs->waitqueue);
869 * gigaset_start() - start device operations
870 * @cs: device descriptor structure.
872 * Prepares the device for use by setting up communication parameters,
873 * scheduling an EV_START event to initiate device initialization, and
874 * waiting for completion of the initialization.
877 * 0 on success, error code < 0 on failure
879 int gigaset_start(struct cardstate *cs)
883 if (mutex_lock_interruptible(&cs->mutex))
886 spin_lock_irqsave(&cs->lock, flags);
888 spin_unlock_irqrestore(&cs->lock, flags);
890 if (cs->mstate != MS_LOCKED) {
891 cs->ops->set_modem_ctrl(cs, 0, TIOCM_DTR | TIOCM_RTS);
892 cs->ops->baud_rate(cs, B115200);
893 cs->ops->set_line_ctrl(cs, CS8);
894 cs->control_state = TIOCM_DTR | TIOCM_RTS;
899 if (!gigaset_add_event(cs, &cs->at_state, EV_START, NULL, 0, NULL)) {
903 gigaset_schedule_event(cs);
905 wait_event(cs->waitqueue, !cs->waiting);
907 mutex_unlock(&cs->mutex);
911 mutex_unlock(&cs->mutex);
914 EXPORT_SYMBOL_GPL(gigaset_start);
917 * gigaset_shutdown() - shut down device operations
918 * @cs: device descriptor structure.
920 * Deactivates the device by scheduling an EV_SHUTDOWN event and
921 * waiting for completion of the shutdown.
924 * 0 - success, -ENODEV - error (no device associated)
926 int gigaset_shutdown(struct cardstate *cs)
928 mutex_lock(&cs->mutex);
930 if (!(cs->flags & VALID_MINOR)) {
931 mutex_unlock(&cs->mutex);
937 if (!gigaset_add_event(cs, &cs->at_state, EV_SHUTDOWN, NULL, 0, NULL))
939 gigaset_schedule_event(cs);
941 wait_event(cs->waitqueue, !cs->waiting);
946 mutex_unlock(&cs->mutex);
949 EXPORT_SYMBOL_GPL(gigaset_shutdown);
952 * gigaset_stop() - stop device operations
953 * @cs: device descriptor structure.
955 * Stops operations on the device by scheduling an EV_STOP event and
956 * waiting for completion of the shutdown.
958 void gigaset_stop(struct cardstate *cs)
960 mutex_lock(&cs->mutex);
964 if (!gigaset_add_event(cs, &cs->at_state, EV_STOP, NULL, 0, NULL))
966 gigaset_schedule_event(cs);
968 wait_event(cs->waitqueue, !cs->waiting);
973 mutex_unlock(&cs->mutex);
975 EXPORT_SYMBOL_GPL(gigaset_stop);
977 static LIST_HEAD(drivers);
978 static DEFINE_SPINLOCK(driver_lock);
980 struct cardstate *gigaset_get_cs_by_id(int id)
983 struct cardstate *ret = NULL;
984 struct cardstate *cs;
985 struct gigaset_driver *drv;
988 spin_lock_irqsave(&driver_lock, flags);
989 list_for_each_entry(drv, &drivers, list) {
990 spin_lock(&drv->lock);
991 for (i = 0; i < drv->minors; ++i) {
993 if ((cs->flags & VALID_ID) && cs->myid == id) {
998 spin_unlock(&drv->lock);
1002 spin_unlock_irqrestore(&driver_lock, flags);
1006 static struct cardstate *gigaset_get_cs_by_minor(unsigned minor)
1008 unsigned long flags;
1009 struct cardstate *ret = NULL;
1010 struct gigaset_driver *drv;
1013 spin_lock_irqsave(&driver_lock, flags);
1014 list_for_each_entry(drv, &drivers, list) {
1015 if (minor < drv->minor || minor >= drv->minor + drv->minors)
1017 index = minor - drv->minor;
1018 spin_lock(&drv->lock);
1019 if (drv->cs[index].flags & VALID_MINOR)
1020 ret = drv->cs + index;
1021 spin_unlock(&drv->lock);
1025 spin_unlock_irqrestore(&driver_lock, flags);
1029 struct cardstate *gigaset_get_cs_by_tty(struct tty_struct *tty)
1031 return gigaset_get_cs_by_minor(tty->index + tty->driver->minor_start);
1035 * gigaset_freedriver() - free all associated ressources of a driver
1036 * @drv: driver descriptor structure.
1038 * Unregisters the driver from the system and deallocates the driver
1039 * structure @drv and all structures referenced from it.
1040 * All devices should be shut down before calling this.
1042 void gigaset_freedriver(struct gigaset_driver *drv)
1044 unsigned long flags;
1046 spin_lock_irqsave(&driver_lock, flags);
1047 list_del(&drv->list);
1048 spin_unlock_irqrestore(&driver_lock, flags);
1050 gigaset_if_freedriver(drv);
1055 EXPORT_SYMBOL_GPL(gigaset_freedriver);
1058 * gigaset_initdriver() - initialize driver structure
1059 * @minor: First minor number
1060 * @minors: Number of minors this driver can handle
1061 * @procname: Name of the driver
1062 * @devname: Name of the device files (prefix without minor number)
1064 * Allocate and initialize gigaset_driver structure. Initialize interface.
1067 * Pointer to the gigaset_driver structure on success, NULL on failure.
1069 struct gigaset_driver *gigaset_initdriver(unsigned minor, unsigned minors,
1070 const char *procname,
1071 const char *devname,
1072 const struct gigaset_ops *ops,
1073 struct module *owner)
1075 struct gigaset_driver *drv;
1076 unsigned long flags;
1079 drv = kmalloc(sizeof *drv, GFP_KERNEL);
1085 drv->minors = minors;
1086 spin_lock_init(&drv->lock);
1090 INIT_LIST_HEAD(&drv->list);
1092 drv->cs = kmalloc(minors * sizeof *drv->cs, GFP_KERNEL);
1096 for (i = 0; i < minors; ++i) {
1097 drv->cs[i].flags = 0;
1098 drv->cs[i].driver = drv;
1099 drv->cs[i].ops = drv->ops;
1100 drv->cs[i].minor_index = i;
1101 mutex_init(&drv->cs[i].mutex);
1104 gigaset_if_initdriver(drv, procname, devname);
1106 spin_lock_irqsave(&driver_lock, flags);
1107 list_add(&drv->list, &drivers);
1108 spin_unlock_irqrestore(&driver_lock, flags);
1116 EXPORT_SYMBOL_GPL(gigaset_initdriver);
1119 * gigaset_blockdriver() - block driver
1120 * @drv: driver descriptor structure.
1122 * Prevents the driver from attaching new devices, in preparation for
1125 void gigaset_blockdriver(struct gigaset_driver *drv)
1129 EXPORT_SYMBOL_GPL(gigaset_blockdriver);
1131 static int __init gigaset_init_module(void)
1133 /* in accordance with the principle of least astonishment,
1134 * setting the 'debug' parameter to 1 activates a sensible
1135 * set of default debug levels
1137 if (gigaset_debuglevel == 1)
1138 gigaset_debuglevel = DEBUG_DEFAULT;
1140 pr_info(DRIVER_DESC DRIVER_DESC_DEBUG "\n");
1141 gigaset_isdn_regdrv();
1145 static void __exit gigaset_exit_module(void)
1147 gigaset_isdn_unregdrv();
1150 module_init(gigaset_init_module);
1151 module_exit(gigaset_exit_module);
1153 MODULE_AUTHOR(DRIVER_AUTHOR);
1154 MODULE_DESCRIPTION(DRIVER_DESC);
1156 MODULE_LICENSE("GPL");