diff --git a/drivers/isdn/gigaset/common.c b/drivers/isdn/gigaset/common.c
new file mode 100644
index 0000000..6437199
--- /dev/null
+++ b/drivers/isdn/gigaset/common.c
@@ -0,0 +1,1203 @@
+/*
+ * Stuff used by all variants of the driver
+ *
+ * Copyright (c) 2001 by Stefan Eilers <Eilers.Stefan@epost.de>,
+ *                       Hansjoerg Lipp <hjlipp@web.de>,
+ *                       Tilman Schmidt <tilman@imap.cc>.
+ *
+ * =====================================================================
+ *	This program is free software; you can redistribute it and/or
+ *	modify it under the terms of the GNU General Public License as
+ *	published by the Free Software Foundation; either version 2 of
+ *	the License, or (at your option) any later version.
+ * =====================================================================
+ * ToDo: ...
+ * =====================================================================
+ * Version: $Id: common.c,v 1.104.4.22 2006/02/04 18:28:16 hjlipp Exp $
+ * =====================================================================
+ */
+
+#include "gigaset.h"
+#include <linux/ctype.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+
+/* Version Information */
+#define DRIVER_AUTHOR "Hansjoerg Lipp <hjlipp@web.de>, Tilman Schmidt <tilman@imap.cc>, Stefan Eilers <Eilers.Stefan@epost.de>"
+#define DRIVER_DESC "Driver for Gigaset 307x"
+
+/* Module parameters */
+int gigaset_debuglevel = DEBUG_DEFAULT;
+EXPORT_SYMBOL_GPL(gigaset_debuglevel);
+module_param_named(debug, gigaset_debuglevel, int, S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(debug, "debug level");
+
+/*======================================================================
+  Prototypes of internal functions
+ */
+
+//static void gigaset_process_response(int resp_code, int parameter,
+//                                     struct at_state_t *at_state,
+//                                     unsigned char ** pstring);
+static struct cardstate *alloc_cs(struct gigaset_driver *drv);
+static void free_cs(struct cardstate *cs);
+static void make_valid(struct cardstate *cs, unsigned mask);
+static void make_invalid(struct cardstate *cs, unsigned mask);
+
+#define VALID_MINOR       0x01
+#define VALID_ID          0x02
+#define ASSIGNED          0x04
+
+/* bitwise byte inversion table */
+__u8 gigaset_invtab[256] = {
+	0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
+	0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
+	0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
+	0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
+	0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
+	0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
+	0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
+	0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
+	0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
+	0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
+	0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
+	0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
+	0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
+	0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
+	0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
+	0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
+	0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
+	0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
+	0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
+	0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
+	0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
+	0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
+	0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
+	0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
+	0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
+	0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
+	0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
+	0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
+	0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
+	0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
+	0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
+	0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff
+};
+EXPORT_SYMBOL_GPL(gigaset_invtab);
+
+void gigaset_dbg_buffer(enum debuglevel level, const unsigned char *msg,
+                        size_t len, const unsigned char *buf, int from_user)
+{
+	unsigned char outbuf[80];
+	unsigned char inbuf[80 - 1];
+	size_t numin;
+	const unsigned char *in;
+	size_t space = sizeof outbuf - 1;
+	unsigned char *out = outbuf;
+
+	if (!from_user) {
+		in = buf;
+		numin = len;
+	} else {
+		numin = len < sizeof inbuf ? len : sizeof inbuf;
+		in = inbuf;
+		if (copy_from_user(inbuf, (const unsigned char __user *) buf, numin)) {
+			strncpy(inbuf, "<FAULT>", sizeof inbuf);
+			numin = sizeof "<FAULT>" - 1;
+		}
+	}
+
+	for (; numin && space; --numin, ++in) {
+		--space;
+		if (*in >= 32)
+			*out++ = *in;
+		else {
+			*out++ = '^';
+			if (space) {
+				*out++ = '@' + *in;
+				--space;
+			}
+		}
+	}
+	*out = 0;
+
+	dbg(level, "%s (%u bytes): %s", msg, (unsigned) len, outbuf);
+}
+EXPORT_SYMBOL_GPL(gigaset_dbg_buffer);
+
+static int setflags(struct cardstate *cs, unsigned flags, unsigned delay)
+{
+	int r;
+
+	r = cs->ops->set_modem_ctrl(cs, cs->control_state, flags);
+	cs->control_state = flags;
+	if (r < 0)
+		return r;
+
+	if (delay) {
+		set_current_state(TASK_INTERRUPTIBLE);
+		schedule_timeout(delay * HZ / 1000);
+	}
+
+	return 0;
+}
+
+int gigaset_enterconfigmode(struct cardstate *cs)
+{
+	int i, r;
+
+	if (!atomic_read(&cs->connected)) {
+		err("not connected!");
+		return -1;
+	}
+
+	cs->control_state = TIOCM_RTS; //FIXME
+
+	r = setflags(cs, TIOCM_DTR, 200);
+	if (r < 0)
+		goto error;
+	r = setflags(cs, 0, 200);
+	if (r < 0)
+		goto error;
+	for (i = 0; i < 5; ++i) {
+		r = setflags(cs, TIOCM_RTS, 100);
+		if (r < 0)
+			goto error;
+		r = setflags(cs, 0, 100);
+		if (r < 0)
+			goto error;
+	}
+	r = setflags(cs, TIOCM_RTS|TIOCM_DTR, 800);
+	if (r < 0)
+		goto error;
+
+	return 0;
+
+error:
+	err("error %d on setuartbits!\n", -r);
+	cs->control_state = TIOCM_RTS|TIOCM_DTR; // FIXME is this a good value?
+	cs->ops->set_modem_ctrl(cs, 0, TIOCM_RTS|TIOCM_DTR);
+
+	return -1; //r
+}
+
+static int test_timeout(struct at_state_t *at_state)
+{
+	if (!at_state->timer_expires)
+		return 0;
+
+	if (--at_state->timer_expires) {
+		dbg(DEBUG_MCMD, "decreased timer of %p to %lu",
+		    at_state, at_state->timer_expires);
+		return 0;
+	}
+
+	if (!gigaset_add_event(at_state->cs, at_state, EV_TIMEOUT, NULL,
+	                       atomic_read(&at_state->timer_index), NULL)) {
+		//FIXME what should we do?
+	}
+
+	return 1;
+}
+
+static void timer_tick(unsigned long data)
+{
+	struct cardstate *cs = (struct cardstate *) data;
+	unsigned long flags;
+	unsigned channel;
+	struct at_state_t *at_state;
+	int timeout = 0;
+
+	spin_lock_irqsave(&cs->lock, flags);
+
+	for (channel = 0; channel < cs->channels; ++channel)
+		if (test_timeout(&cs->bcs[channel].at_state))
+			timeout = 1;
+
+	if (test_timeout(&cs->at_state))
+		timeout = 1;
+
+	list_for_each_entry(at_state, &cs->temp_at_states, list)
+		if (test_timeout(at_state))
+			timeout = 1;
+
+	if (atomic_read(&cs->running)) {
+		mod_timer(&cs->timer, jiffies + GIG_TICK);
+		if (timeout) {
+			dbg(DEBUG_CMD, "scheduling timeout");
+			tasklet_schedule(&cs->event_tasklet);
+		}
+	}
+
+	spin_unlock_irqrestore(&cs->lock, flags);
+}
+
+int gigaset_get_channel(struct bc_state *bcs)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&bcs->cs->lock, flags);
+	if (bcs->use_count) {
+		dbg(DEBUG_ANY, "could not allocate channel %d", bcs->channel);
+		spin_unlock_irqrestore(&bcs->cs->lock, flags);
+		return 0;
+	}
+	++bcs->use_count;
+	bcs->busy = 1;
+	dbg(DEBUG_ANY, "allocated channel %d", bcs->channel);
+	spin_unlock_irqrestore(&bcs->cs->lock, flags);
+	return 1;
+}
+
+void gigaset_free_channel(struct bc_state *bcs)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&bcs->cs->lock, flags);
+	if (!bcs->busy) {
+		dbg(DEBUG_ANY, "could not free channel %d", bcs->channel);
+		spin_unlock_irqrestore(&bcs->cs->lock, flags);
+		return;
+	}
+	--bcs->use_count;
+	bcs->busy = 0;
+	dbg(DEBUG_ANY, "freed channel %d", bcs->channel);
+	spin_unlock_irqrestore(&bcs->cs->lock, flags);
+}
+
+int gigaset_get_channels(struct cardstate *cs)
+{
+	unsigned long flags;
+	int i;
+
+	spin_lock_irqsave(&cs->lock, flags);
+	for (i = 0; i < cs->channels; ++i)
+		if (cs->bcs[i].use_count) {
+			spin_unlock_irqrestore(&cs->lock, flags);
+			dbg(DEBUG_ANY, "could not allocated all channels");
+			return 0;
+		}
+	for (i = 0; i < cs->channels; ++i)
+		++cs->bcs[i].use_count;
+	spin_unlock_irqrestore(&cs->lock, flags);
+
+	dbg(DEBUG_ANY, "allocated all channels");
+
+	return 1;
+}
+
+void gigaset_free_channels(struct cardstate *cs)
+{
+	unsigned long flags;
+	int i;
+
+	dbg(DEBUG_ANY, "unblocking all channels");
+	spin_lock_irqsave(&cs->lock, flags);
+	for (i = 0; i < cs->channels; ++i)
+		--cs->bcs[i].use_count;
+	spin_unlock_irqrestore(&cs->lock, flags);
+}
+
+void gigaset_block_channels(struct cardstate *cs)
+{
+	unsigned long flags;
+	int i;
+
+	dbg(DEBUG_ANY, "blocking all channels");
+	spin_lock_irqsave(&cs->lock, flags);
+	for (i = 0; i < cs->channels; ++i)
+		++cs->bcs[i].use_count;
+	spin_unlock_irqrestore(&cs->lock, flags);
+}
+
+static void clear_events(struct cardstate *cs)
+{
+	struct event_t *ev;
+	unsigned head, tail;
+
+	/* no locking needed (no reader/writer allowed) */
+
+	head = atomic_read(&cs->ev_head);
+	tail = atomic_read(&cs->ev_tail);
+
+	while (tail != head) {
+		ev = cs->events + head;
+		kfree(ev->ptr);
+
+		head = (head + 1) % MAX_EVENTS;
+	}
+
+	atomic_set(&cs->ev_head, tail);
+}
+
+struct event_t *gigaset_add_event(struct cardstate *cs,
+                                  struct at_state_t *at_state, int type,
+                                  void *ptr, int parameter, void *arg)
+{
+	unsigned long flags;
+	unsigned next, tail;
+	struct event_t *event = NULL;
+
+	spin_lock_irqsave(&cs->ev_lock, flags);
+
+	tail = atomic_read(&cs->ev_tail);
+	next = (tail + 1) % MAX_EVENTS;
+	if (unlikely(next == atomic_read(&cs->ev_head)))
+		err("event queue full");
+	else {
+		event = cs->events + tail;
+		event->type = type;
+		event->at_state = at_state;
+		event->cid = -1;
+		event->ptr = ptr;
+		event->arg = arg;
+		event->parameter = parameter;
+		atomic_set(&cs->ev_tail, next);
+	}
+
+	spin_unlock_irqrestore(&cs->ev_lock, flags);
+
+	return event;
+}
+EXPORT_SYMBOL_GPL(gigaset_add_event);
+
+static void free_strings(struct at_state_t *at_state)
+{
+	int i;
+
+	for (i = 0; i < STR_NUM; ++i) {
+		kfree(at_state->str_var[i]);
+		at_state->str_var[i] = NULL;
+	}
+}
+
+static void clear_at_state(struct at_state_t *at_state)
+{
+	free_strings(at_state);
+}
+
+static void dealloc_at_states(struct cardstate *cs)
+{
+	struct at_state_t *cur, *next;
+
+	list_for_each_entry_safe(cur, next, &cs->temp_at_states, list) {
+		list_del(&cur->list);
+		free_strings(cur);
+		kfree(cur);
+	}
+}
+
+static void gigaset_freebcs(struct bc_state *bcs)
+{
+	int i;
+
+	dbg(DEBUG_INIT, "freeing bcs[%d]->hw", bcs->channel);
+	if (!bcs->cs->ops->freebcshw(bcs)) {
+		dbg(DEBUG_INIT, "failed");
+	}
+
+	dbg(DEBUG_INIT, "clearing bcs[%d]->at_state", bcs->channel);
+	clear_at_state(&bcs->at_state);
+	dbg(DEBUG_INIT, "freeing bcs[%d]->skb", bcs->channel);
+
+	if (bcs->skb)
+		dev_kfree_skb(bcs->skb);
+	for (i = 0; i < AT_NUM; ++i) {
+		kfree(bcs->commands[i]);
+		bcs->commands[i] = NULL;
+	}
+}
+
+void gigaset_freecs(struct cardstate *cs)
+{
+	int i;
+	unsigned long flags;
+
+	if (!cs)
+		return;
+
+	down(&cs->sem);
+
+	if (!cs->bcs)
+		goto f_cs;
+	if (!cs->inbuf)
+		goto f_bcs;
+
+	spin_lock_irqsave(&cs->lock, flags);
+	atomic_set(&cs->running, 0);
+	spin_unlock_irqrestore(&cs->lock, flags); /* event handler and timer are not rescheduled below */
+
+	tasklet_kill(&cs->event_tasklet);
+	del_timer_sync(&cs->timer);
+
+	switch (cs->cs_init) {
+	default:
+		gigaset_if_free(cs);
+
+		dbg(DEBUG_INIT, "clearing hw");
+		cs->ops->freecshw(cs);
+
+		//FIXME cmdbuf
+
+		/* fall through */
+	case 2: /* error in initcshw */
+		/* Deregister from LL */
+		make_invalid(cs, VALID_ID);
+		dbg(DEBUG_INIT, "clearing iif");
+		gigaset_i4l_cmd(cs, ISDN_STAT_UNLOAD);
+
+		/* fall through */
+	case 1: /* error when regestering to LL */
+		dbg(DEBUG_INIT, "clearing at_state");
+		clear_at_state(&cs->at_state);
+		dealloc_at_states(cs);
+
+		/* fall through */
+	case 0: /* error in one call to initbcs */
+		for (i = 0; i < cs->channels; ++i) {
+			dbg(DEBUG_INIT, "clearing bcs[%d]", i);
+			gigaset_freebcs(cs->bcs + i);
+		}
+
+		clear_events(cs);
+		dbg(DEBUG_INIT, "freeing inbuf");
+		kfree(cs->inbuf);
+	}
+f_bcs:	dbg(DEBUG_INIT, "freeing bcs[]");
+	kfree(cs->bcs);
+f_cs:	dbg(DEBUG_INIT, "freeing cs");
+	up(&cs->sem);
+	free_cs(cs);
+}
+EXPORT_SYMBOL_GPL(gigaset_freecs);
+
+void gigaset_at_init(struct at_state_t *at_state, struct bc_state *bcs,
+                     struct cardstate *cs, int cid)
+{
+	int i;
+
+	INIT_LIST_HEAD(&at_state->list);
+	at_state->waiting = 0;
+	at_state->getstring = 0;
+	at_state->pending_commands = 0;
+	at_state->timer_expires = 0;
+	at_state->timer_active = 0;
+	atomic_set(&at_state->timer_index, 0);
+	atomic_set(&at_state->seq_index, 0);
+	at_state->ConState = 0;
+	for (i = 0; i < STR_NUM; ++i)
+		at_state->str_var[i] = NULL;
+	at_state->int_var[VAR_ZDLE] = 0;
+	at_state->int_var[VAR_ZCTP] = -1;
+	at_state->int_var[VAR_ZSAU] = ZSAU_NULL;
+	at_state->cs = cs;
+	at_state->bcs = bcs;
+	at_state->cid = cid;
+	if (!cid)
+		at_state->replystruct = cs->tabnocid;
+	else
+		at_state->replystruct = cs->tabcid;
+}
+
+
+static void gigaset_inbuf_init(struct inbuf_t *inbuf, struct bc_state *bcs,
+                               struct cardstate *cs, int inputstate)
+/* inbuf->read must be allocated before! */
+{
+	atomic_set(&inbuf->head, 0);
+	atomic_set(&inbuf->tail, 0);
+	inbuf->cs = cs;
+	inbuf->bcs = bcs; /*base driver: NULL*/
+	inbuf->rcvbuf = NULL; //FIXME
+	inbuf->inputstate = inputstate;
+}
+
+/* Initialize the b-channel structure */
+static struct bc_state *gigaset_initbcs(struct bc_state *bcs,
+                                        struct cardstate *cs, int channel)
+{
+	int i;
+
+	bcs->tx_skb = NULL; //FIXME -> hw part
+
+	skb_queue_head_init(&bcs->squeue);
+
+	bcs->corrupted = 0;
+	bcs->trans_down = 0;
+	bcs->trans_up = 0;
+
+	dbg(DEBUG_INIT, "setting up bcs[%d]->at_state", channel);
+	gigaset_at_init(&bcs->at_state, bcs, cs, -1);
+
+	bcs->rcvbytes = 0;
+
+#ifdef CONFIG_GIGASET_DEBUG
+	bcs->emptycount = 0;
+#endif
+
+	dbg(DEBUG_INIT, "allocating bcs[%d]->skb", channel);
+	bcs->fcs = PPP_INITFCS;
+	bcs->inputstate = 0;
+	if (cs->ignoreframes) {
+		bcs->inputstate |= INS_skip_frame;
+		bcs->skb = NULL;
+	} else if ((bcs->skb = dev_alloc_skb(SBUFSIZE + HW_HDR_LEN)) != NULL)
+		skb_reserve(bcs->skb, HW_HDR_LEN);
+	else {
+		warn("could not allocate skb");
+		bcs->inputstate |= INS_skip_frame;
+	}
+
+	bcs->channel = channel;
+	bcs->cs = cs;
+
+	bcs->chstate = 0;
+	bcs->use_count = 1;
+	bcs->busy = 0;
+	bcs->ignore = cs->ignoreframes;
+
+	for (i = 0; i < AT_NUM; ++i)
+		bcs->commands[i] = NULL;
+
+	dbg(DEBUG_INIT, "  setting up bcs[%d]->hw", channel);
+	if (cs->ops->initbcshw(bcs))
+		return bcs;
+
+//error:
+	dbg(DEBUG_INIT, "  failed");
+
+	dbg(DEBUG_INIT, "  freeing bcs[%d]->skb", channel);
+	if (bcs->skb)
+		dev_kfree_skb(bcs->skb);
+
+	return NULL;
+}
+
+/* gigaset_initcs
+ * Allocate and initialize cardstate structure for Gigaset driver
+ * Calls hardware dependent gigaset_initcshw() function
+ * Calls B channel initialization function gigaset_initbcs() for each B channel
+ * parameters:
+ *      drv		hardware driver the device belongs to
+ *	channels	number of B channels supported by device
+ *	onechannel	!=0: B channel data and AT commands share one communication channel
+ *			==0: B channels have separate communication channels
+ *	ignoreframes	number of frames to ignore after setting up B channel
+ *	cidmode		!=0: start in CallID mode
+ *	modulename	name of driver module (used for I4L registration)
+ * return value:
+ *	pointer to cardstate structure
+ */
+struct cardstate *gigaset_initcs(struct gigaset_driver *drv, int channels,
+				 int onechannel, int ignoreframes,
+				 int cidmode, const char *modulename)
+{
+	struct cardstate *cs = NULL;
+	int i;
+
+	dbg(DEBUG_INIT, "allocating cs");
+	cs = alloc_cs(drv);
+	if (!cs)
+		goto error;
+	dbg(DEBUG_INIT, "allocating bcs[0..%d]", channels - 1);
+	cs->bcs = kmalloc(channels * sizeof(struct bc_state), GFP_KERNEL);
+	if (!cs->bcs)
+		goto error;
+	dbg(DEBUG_INIT, "allocating inbuf");
+	cs->inbuf = kmalloc(sizeof(struct inbuf_t), GFP_KERNEL);
+	if (!cs->inbuf)
+		goto error;
+
+	cs->cs_init = 0;
+	cs->channels = channels;
+	cs->onechannel = onechannel;
+	cs->ignoreframes = ignoreframes;
+	INIT_LIST_HEAD(&cs->temp_at_states);
+	atomic_set(&cs->running, 0);
+	init_timer(&cs->timer); /* clear next & prev */
+	spin_lock_init(&cs->ev_lock);
+	atomic_set(&cs->ev_tail, 0);
+	atomic_set(&cs->ev_head, 0);
+	init_MUTEX_LOCKED(&cs->sem);
+	tasklet_init(&cs->event_tasklet, &gigaset_handle_event, (unsigned long) cs);
+	atomic_set(&cs->commands_pending, 0);
+	cs->cur_at_seq = 0;
+	cs->gotfwver = -1;
+	cs->open_count = 0;
+	cs->tty = NULL;
+	atomic_set(&cs->cidmode, cidmode != 0);
+
+	//if(onechannel) { //FIXME
+		cs->tabnocid = gigaset_tab_nocid_m10x;
+		cs->tabcid = gigaset_tab_cid_m10x;
+	//} else {
+	//	cs->tabnocid = gigaset_tab_nocid;
+	//	cs->tabcid = gigaset_tab_cid;
+	//}
+
+	init_waitqueue_head(&cs->waitqueue);
+	cs->waiting = 0;
+
+	atomic_set(&cs->mode, M_UNKNOWN);
+	atomic_set(&cs->mstate, MS_UNINITIALIZED);
+
+	for (i = 0; i < channels; ++i) {
+		dbg(DEBUG_INIT, "setting up bcs[%d].read", i);
+		if (!gigaset_initbcs(cs->bcs + i, cs, i))
+			goto error;
+	}
+
+	++cs->cs_init;
+
+	dbg(DEBUG_INIT, "setting up at_state");
+	spin_lock_init(&cs->lock);
+	gigaset_at_init(&cs->at_state, NULL, cs, 0);
+	cs->dle = 0;
+	cs->cbytes = 0;
+
+	dbg(DEBUG_INIT, "setting up inbuf");
+	if (onechannel) {			//FIXME distinction necessary?
+		gigaset_inbuf_init(cs->inbuf, cs->bcs, cs, INS_command);
+	} else
+		gigaset_inbuf_init(cs->inbuf, NULL,    cs, INS_command);
+
+	atomic_set(&cs->connected, 0);
+
+	dbg(DEBUG_INIT, "setting up cmdbuf");
+	cs->cmdbuf = cs->lastcmdbuf = NULL;
+	spin_lock_init(&cs->cmdlock);
+	cs->curlen = 0;
+	cs->cmdbytes = 0;
+
+	/*
+	 * Tell the ISDN4Linux subsystem (the LL) that
+	 * a driver for a USB-Device is available !
+	 * If this is done, "isdnctrl" is able to bind a device for this driver even
+	 * if no physical usb-device is currently connected.
+	 * But this device will just be accessable if a physical USB device is connected
+	 * (via "gigaset_probe") .
+	 */
+	dbg(DEBUG_INIT, "setting up iif");
+	if (!gigaset_register_to_LL(cs, modulename)) {
+		err("register_isdn=>error");
+		goto error;
+	}
+
+	make_valid(cs, VALID_ID);
+	++cs->cs_init;
+	dbg(DEBUG_INIT, "setting up hw");
+	if (!cs->ops->initcshw(cs))
+		goto error;
+
+	++cs->cs_init;
+
+	gigaset_if_init(cs);
+
+	atomic_set(&cs->running, 1);
+	cs->timer.data = (unsigned long) cs;
+	cs->timer.function = timer_tick;
+	cs->timer.expires = jiffies + GIG_TICK;
+	/* FIXME: can jiffies increase too much until the timer is added?
+	 * Same problem(?) with mod_timer() in timer_tick(). */
+	add_timer(&cs->timer);
+
+	dbg(DEBUG_INIT, "cs initialized!");
+	up(&cs->sem);
+	return cs;
+
+error:	if (cs)
+		up(&cs->sem);
+	dbg(DEBUG_INIT, "failed");
+	gigaset_freecs(cs);
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(gigaset_initcs);
+
+/* ReInitialize the b-channel structure */ /* e.g. called on hangup, disconnect */
+void gigaset_bcs_reinit(struct bc_state *bcs)
+{
+	struct sk_buff *skb;
+	struct cardstate *cs = bcs->cs;
+	unsigned long flags;
+
+	while ((skb = skb_dequeue(&bcs->squeue)) != NULL)
+		dev_kfree_skb(skb);
+
+	spin_lock_irqsave(&cs->lock, flags); //FIXME
+	clear_at_state(&bcs->at_state);
+	bcs->at_state.ConState = 0;
+	bcs->at_state.timer_active = 0;
+	bcs->at_state.timer_expires = 0;
+	bcs->at_state.cid = -1;                     /* No CID defined */
+	spin_unlock_irqrestore(&cs->lock, flags);
+
+	bcs->inputstate = 0;
+
+#ifdef CONFIG_GIGASET_DEBUG
+	bcs->emptycount = 0;
+#endif
+
+	bcs->fcs = PPP_INITFCS;
+	bcs->chstate = 0;
+
+	bcs->ignore = cs->ignoreframes;
+	if (bcs->ignore)
+		bcs->inputstate |= INS_skip_frame;
+
+
+	cs->ops->reinitbcshw(bcs);
+}
+
+static void cleanup_cs(struct cardstate *cs)
+{
+	struct cmdbuf_t *cb, *tcb;
+	int i;
+	unsigned long flags;
+
+	spin_lock_irqsave(&cs->lock, flags);
+
+	atomic_set(&cs->mode, M_UNKNOWN);
+	atomic_set(&cs->mstate, MS_UNINITIALIZED);
+
+	clear_at_state(&cs->at_state);
+	dealloc_at_states(cs);
+	free_strings(&cs->at_state);
+	gigaset_at_init(&cs->at_state, NULL, cs, 0);
+
+	kfree(cs->inbuf->rcvbuf);
+	cs->inbuf->rcvbuf = NULL;
+	cs->inbuf->inputstate = INS_command;
+	atomic_set(&cs->inbuf->head, 0);
+	atomic_set(&cs->inbuf->tail, 0);
+
+	cb = cs->cmdbuf;
+	while (cb) {
+		tcb = cb;
+		cb = cb->next;
+		kfree(tcb);
+	}
+	cs->cmdbuf = cs->lastcmdbuf = NULL;
+	cs->curlen = 0;
+	cs->cmdbytes = 0;
+	cs->gotfwver = -1;
+	cs->dle = 0;
+	cs->cur_at_seq = 0;
+	atomic_set(&cs->commands_pending, 0);
+	cs->cbytes = 0;
+
+	spin_unlock_irqrestore(&cs->lock, flags);
+
+	for (i = 0; i < cs->channels; ++i) {
+		gigaset_freebcs(cs->bcs + i);
+		if (!gigaset_initbcs(cs->bcs + i, cs, i))
+			break;			//FIXME error handling
+	}
+
+	if (cs->waiting) {
+		cs->cmd_result = -ENODEV;
+		cs->waiting = 0;
+		wake_up_interruptible(&cs->waitqueue);
+	}
+}
+
+
+int gigaset_start(struct cardstate *cs)
+{
+	if (down_interruptible(&cs->sem))
+		return 0;
+	//info("USB device for Gigaset 307x now attached to Dev %d", ucs->minor);
+
+	atomic_set(&cs->connected, 1);
+
+	if (atomic_read(&cs->mstate) != MS_LOCKED) {
+		cs->ops->set_modem_ctrl(cs, 0, TIOCM_DTR|TIOCM_RTS);
+		cs->ops->baud_rate(cs, B115200);
+		cs->ops->set_line_ctrl(cs, CS8);
+		cs->control_state = TIOCM_DTR|TIOCM_RTS;
+	} else {
+		//FIXME use some saved values?
+	}
+
+	cs->waiting = 1;
+
+	if (!gigaset_add_event(cs, &cs->at_state, EV_START, NULL, 0, NULL)) {
+		cs->waiting = 0;
+		//FIXME what should we do?
+		goto error;
+	}
+
+	dbg(DEBUG_CMD, "scheduling START");
+	gigaset_schedule_event(cs);
+
+	wait_event(cs->waitqueue, !cs->waiting);
+
+	up(&cs->sem);
+	return 1;
+
+error:
+	up(&cs->sem);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(gigaset_start);
+
+void gigaset_shutdown(struct cardstate *cs)
+{
+	down(&cs->sem);
+
+	cs->waiting = 1;
+
+	if (!gigaset_add_event(cs, &cs->at_state, EV_SHUTDOWN, NULL, 0, NULL)) {
+		//FIXME what should we do?
+		goto exit;
+	}
+
+	dbg(DEBUG_CMD, "scheduling SHUTDOWN");
+	gigaset_schedule_event(cs);
+
+	if (wait_event_interruptible(cs->waitqueue, !cs->waiting)) {
+		warn("aborted");
+		//FIXME
+	}
+
+	if (atomic_read(&cs->mstate) != MS_LOCKED) {
+		//FIXME?
+		//gigaset_baud_rate(cs, B115200);
+		//gigaset_set_line_ctrl(cs, CS8);
+		//gigaset_set_modem_ctrl(cs, TIOCM_DTR|TIOCM_RTS, 0);
+		//cs->control_state = 0;
+	} else {
+		//FIXME use some saved values?
+	}
+
+	cleanup_cs(cs);
+
+exit:
+	up(&cs->sem);
+}
+EXPORT_SYMBOL_GPL(gigaset_shutdown);
+
+void gigaset_stop(struct cardstate *cs)
+{
+	down(&cs->sem);
+
+	atomic_set(&cs->connected, 0);
+
+	cs->waiting = 1;
+
+	if (!gigaset_add_event(cs, &cs->at_state, EV_STOP, NULL, 0, NULL)) {
+		//FIXME what should we do?
+		goto exit;
+	}
+
+	dbg(DEBUG_CMD, "scheduling STOP");
+	gigaset_schedule_event(cs);
+
+	if (wait_event_interruptible(cs->waitqueue, !cs->waiting)) {
+		warn("aborted");
+		//FIXME
+	}
+
+	/* Tell the LL that the device is not available .. */
+	gigaset_i4l_cmd(cs, ISDN_STAT_STOP); // FIXME move to event layer?
+
+	cleanup_cs(cs);
+
+exit:
+	up(&cs->sem);
+}
+EXPORT_SYMBOL_GPL(gigaset_stop);
+
+static LIST_HEAD(drivers);
+static spinlock_t driver_lock = SPIN_LOCK_UNLOCKED;
+
+struct cardstate *gigaset_get_cs_by_id(int id)
+{
+	unsigned long flags;
+	static struct cardstate *ret = NULL;
+	static struct cardstate *cs;
+	struct gigaset_driver *drv;
+	unsigned i;
+
+	spin_lock_irqsave(&driver_lock, flags);
+	list_for_each_entry(drv, &drivers, list) {
+		spin_lock(&drv->lock);
+		for (i = 0; i < drv->minors; ++i) {
+			if (drv->flags[i] & VALID_ID) {
+				cs = drv->cs + i;
+				if (cs->myid == id)
+					ret = cs;
+			}
+			if (ret)
+				break;
+		}
+		spin_unlock(&drv->lock);
+		if (ret)
+			break;
+	}
+	spin_unlock_irqrestore(&driver_lock, flags);
+	return ret;
+}
+
+void gigaset_debugdrivers(void)
+{
+	unsigned long flags;
+	static struct cardstate *cs;
+	struct gigaset_driver *drv;
+	unsigned i;
+
+	spin_lock_irqsave(&driver_lock, flags);
+	list_for_each_entry(drv, &drivers, list) {
+		dbg(DEBUG_DRIVER, "driver %p", drv);
+		spin_lock(&drv->lock);
+		for (i = 0; i < drv->minors; ++i) {
+			dbg(DEBUG_DRIVER, "  index %u", i);
+			dbg(DEBUG_DRIVER, "    flags 0x%02x", drv->flags[i]);
+			cs = drv->cs + i;
+			dbg(DEBUG_DRIVER, "    cardstate %p", cs);
+			dbg(DEBUG_DRIVER, "    minor_index %u", cs->minor_index);
+			dbg(DEBUG_DRIVER, "    driver %p", cs->driver);
+			dbg(DEBUG_DRIVER, "    i4l id %d", cs->myid);
+		}
+		spin_unlock(&drv->lock);
+	}
+	spin_unlock_irqrestore(&driver_lock, flags);
+}
+EXPORT_SYMBOL_GPL(gigaset_debugdrivers);
+
+struct cardstate *gigaset_get_cs_by_tty(struct tty_struct *tty)
+{
+	if (tty->index < 0 || tty->index >= tty->driver->num)
+		return NULL;
+	return gigaset_get_cs_by_minor(tty->index + tty->driver->minor_start);
+}
+
+struct cardstate *gigaset_get_cs_by_minor(unsigned minor)
+{
+	unsigned long flags;
+	static struct cardstate *ret = NULL;
+	struct gigaset_driver *drv;
+	unsigned index;
+
+	spin_lock_irqsave(&driver_lock, flags);
+	list_for_each_entry(drv, &drivers, list) {
+		if (minor < drv->minor || minor >= drv->minor + drv->minors)
+			continue;
+		index = minor - drv->minor;
+		spin_lock(&drv->lock);
+		if (drv->flags[index] & VALID_MINOR)
+			ret = drv->cs + index;
+		spin_unlock(&drv->lock);
+		if (ret)
+			break;
+	}
+	spin_unlock_irqrestore(&driver_lock, flags);
+	return ret;
+}
+
+void gigaset_freedriver(struct gigaset_driver *drv)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&driver_lock, flags);
+	list_del(&drv->list);
+	spin_unlock_irqrestore(&driver_lock, flags);
+
+	gigaset_if_freedriver(drv);
+	module_put(drv->owner);
+
+	kfree(drv->cs);
+	kfree(drv->flags);
+	kfree(drv);
+}
+EXPORT_SYMBOL_GPL(gigaset_freedriver);
+
+/* gigaset_initdriver
+ * Allocate and initialize gigaset_driver structure. Initialize interface.
+ * parameters:
+ *      minor           First minor number
+ *      minors          Number of minors this driver can handle
+ *      procname        Name of the driver (e.g. for /proc/tty/drivers, path in /proc/driver)
+ *      devname         Name of the device files (prefix without minor number)
+ *      devfsname       Devfs name of the device files without %d
+ * return value:
+ *      Pointer to the gigaset_driver structure on success, NULL on failure.
+ */
+struct gigaset_driver *gigaset_initdriver(unsigned minor, unsigned minors,
+                                          const char *procname,
+                                          const char *devname,
+                                          const char *devfsname,
+                                          const struct gigaset_ops *ops,
+                                          struct module *owner)
+{
+	struct gigaset_driver *drv;
+	unsigned long flags;
+	unsigned i;
+
+	drv = kmalloc(sizeof *drv, GFP_KERNEL);
+	if (!drv)
+		return NULL;
+	if (!try_module_get(owner))
+		return NULL;
+
+	drv->cs = NULL;
+	drv->have_tty = 0;
+	drv->minor = minor;
+	drv->minors = minors;
+	spin_lock_init(&drv->lock);
+	drv->blocked = 0;
+	drv->ops = ops;
+	drv->owner = owner;
+	INIT_LIST_HEAD(&drv->list);
+
+	drv->cs = kmalloc(minors * sizeof *drv->cs, GFP_KERNEL);
+	if (!drv->cs)
+		goto out1;
+	drv->flags = kmalloc(minors * sizeof *drv->flags, GFP_KERNEL);
+	if (!drv->flags)
+		goto out2;
+
+	for (i = 0; i < minors; ++i) {
+		drv->flags[i] = 0;
+		drv->cs[i].driver = drv;
+		drv->cs[i].ops = drv->ops;
+		drv->cs[i].minor_index = i;
+	}
+
+	gigaset_if_initdriver(drv, procname, devname, devfsname);
+
+	spin_lock_irqsave(&driver_lock, flags);
+	list_add(&drv->list, &drivers);
+	spin_unlock_irqrestore(&driver_lock, flags);
+
+	return drv;
+
+out2:
+	kfree(drv->cs);
+out1:
+	kfree(drv);
+	module_put(owner);
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(gigaset_initdriver);
+
+static struct cardstate *alloc_cs(struct gigaset_driver *drv)
+{
+	unsigned long flags;
+	unsigned i;
+	static struct cardstate *ret = NULL;
+
+	spin_lock_irqsave(&drv->lock, flags);
+	for (i = 0; i < drv->minors; ++i) {
+		if (!(drv->flags[i] & VALID_MINOR)) {
+			drv->flags[i] = VALID_MINOR;
+			ret = drv->cs + i;
+		}
+		if (ret)
+			break;
+	}
+	spin_unlock_irqrestore(&drv->lock, flags);
+	return ret;
+}
+
+static void free_cs(struct cardstate *cs)
+{
+	unsigned long flags;
+	struct gigaset_driver *drv = cs->driver;
+	spin_lock_irqsave(&drv->lock, flags);
+	drv->flags[cs->minor_index] = 0;
+	spin_unlock_irqrestore(&drv->lock, flags);
+}
+
+static void make_valid(struct cardstate *cs, unsigned mask)
+{
+	unsigned long flags;
+	struct gigaset_driver *drv = cs->driver;
+	spin_lock_irqsave(&drv->lock, flags);
+	drv->flags[cs->minor_index] |= mask;
+	spin_unlock_irqrestore(&drv->lock, flags);
+}
+
+static void make_invalid(struct cardstate *cs, unsigned mask)
+{
+	unsigned long flags;
+	struct gigaset_driver *drv = cs->driver;
+	spin_lock_irqsave(&drv->lock, flags);
+	drv->flags[cs->minor_index] &= ~mask;
+	spin_unlock_irqrestore(&drv->lock, flags);
+}
+
+/* For drivers without fixed assignment device<->cardstate (usb) */
+struct cardstate *gigaset_getunassignedcs(struct gigaset_driver *drv)
+{
+	unsigned long flags;
+	struct cardstate *cs = NULL;
+	unsigned i;
+
+	spin_lock_irqsave(&drv->lock, flags);
+	if (drv->blocked)
+		goto exit;
+	for (i = 0; i < drv->minors; ++i) {
+		if ((drv->flags[i] & VALID_MINOR) &&
+		    !(drv->flags[i] & ASSIGNED)) {
+			drv->flags[i] |= ASSIGNED;
+			cs = drv->cs + i;
+			break;
+		}
+	}
+exit:
+	spin_unlock_irqrestore(&drv->lock, flags);
+	return cs;
+}
+EXPORT_SYMBOL_GPL(gigaset_getunassignedcs);
+
+void gigaset_unassign(struct cardstate *cs)
+{
+	unsigned long flags;
+	unsigned *minor_flags;
+	struct gigaset_driver *drv;
+
+	if (!cs)
+		return;
+	drv = cs->driver;
+	spin_lock_irqsave(&drv->lock, flags);
+	minor_flags = drv->flags + cs->minor_index;
+	if (*minor_flags & VALID_MINOR)
+		*minor_flags &= ~ASSIGNED;
+	spin_unlock_irqrestore(&drv->lock, flags);
+}
+EXPORT_SYMBOL_GPL(gigaset_unassign);
+
+void gigaset_blockdriver(struct gigaset_driver *drv)
+{
+	unsigned long flags;
+	spin_lock_irqsave(&drv->lock, flags);
+	drv->blocked = 1;
+	spin_unlock_irqrestore(&drv->lock, flags);
+}
+EXPORT_SYMBOL_GPL(gigaset_blockdriver);
+
+static int __init gigaset_init_module(void)
+{
+	/* in accordance with the principle of least astonishment,
+	 * setting the 'debug' parameter to 1 activates a sensible
+	 * set of default debug levels
+	 */
+	if (gigaset_debuglevel == 1)
+		gigaset_debuglevel = DEBUG_DEFAULT;
+
+	info(DRIVER_AUTHOR);
+	info(DRIVER_DESC);
+	return 0;
+}
+
+static void __exit gigaset_exit_module(void)
+{
+}
+
+module_init(gigaset_init_module);
+module_exit(gigaset_exit_module);
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+
+MODULE_LICENSE("GPL");
diff --git a/drivers/isdn/gigaset/gigaset.h b/drivers/isdn/gigaset/gigaset.h
new file mode 100644
index 0000000..729edcd
--- /dev/null
+++ b/drivers/isdn/gigaset/gigaset.h
@@ -0,0 +1,938 @@
+/* Siemens Gigaset 307x driver
+ * Common header file for all connection variants
+ *
+ * Written by Stefan Eilers <Eilers.Stefan@epost.de>
+ *        and Hansjoerg Lipp <hjlipp@web.de>
+ *
+ * Version: $Id: gigaset.h,v 1.97.4.26 2006/02/04 18:28:16 hjlipp Exp $
+ * ===========================================================================
+ */
+
+#ifndef GIGASET_H
+#define GIGASET_H
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/compiler.h>
+#include <linux/types.h>
+#include <asm/atomic.h>
+#include <linux/spinlock.h>
+#include <linux/isdnif.h>
+#include <linux/usb.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/ppp_defs.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/tty.h>
+#include <linux/tty_driver.h>
+#include <linux/list.h>
+
+#define GIG_VERSION {0,5,0,0}
+#define GIG_COMPAT  {0,4,0,0}
+
+#define MAX_REC_PARAMS 10                         /* Max. number of params in response string */
+#define MAX_RESP_SIZE 512                         /* Max. size of a response string */
+#define HW_HDR_LEN 2                              /* Header size used to store ack info */
+
+#define MAX_EVENTS 64                          /* size of event queue */
+
+#define RBUFSIZE 8192
+#define SBUFSIZE 4096				/* sk_buff payload size */
+
+#define MAX_BUF_SIZE (SBUFSIZE - 2)		/* Max. size of a data packet from LL */
+#define TRANSBUFSIZE 768			/* bytes per skb for transparent receive */
+
+/* compile time options */
+#define GIG_MAJOR 0
+
+#define GIG_MAYINITONDIAL
+#define GIG_RETRYCID
+#define GIG_X75
+
+#define MAX_TIMER_INDEX 1000
+#define MAX_SEQ_INDEX   1000
+
+#define GIG_TICK (HZ / 10)
+
+/* timeout values (unit: 1 sec) */
+#define INIT_TIMEOUT 1
+
+/* timeout values (unit: 0.1 sec) */
+#define RING_TIMEOUT 3		/* for additional parameters to RING */
+#define BAS_TIMEOUT 20		/* for response to Base USB ops */
+#define ATRDY_TIMEOUT 3		/* for HD_READY_SEND_ATDATA */
+
+#define BAS_RETRY 3		/* max. retries for base USB ops */
+
+#define MAXACT 3
+
+#define IFNULL(a)         if (unlikely(!(a)))
+#define IFNULLRET(a)      if (unlikely(!(a))) {err("%s==NULL at %s:%d!", #a, __FILE__, __LINE__); return; }
+#define IFNULLRETVAL(a,b) if (unlikely(!(a))) {err("%s==NULL at %s:%d!", #a, __FILE__, __LINE__); return (b); }
+#define IFNULLCONT(a)     if (unlikely(!(a))) {err("%s==NULL at %s:%d!", #a, __FILE__, __LINE__); continue; }
+#define IFNULLGOTO(a,b)   if (unlikely(!(a))) {err("%s==NULL at %s:%d!", #a, __FILE__, __LINE__); goto b; }
+
+extern int gigaset_debuglevel;	/* "needs" cast to (enum debuglevel) */
+
+/* any combination of these can be given with the 'debug=' parameter to insmod, e.g.
+ * 'insmod usb_gigaset.o debug=0x2c' will set DEBUG_OPEN, DEBUG_CMD and DEBUG_INTR. */
+enum debuglevel { /* up to 24 bits (atomic_t) */
+	DEBUG_REG	  = 0x0002, /* serial port I/O register operations */
+	DEBUG_OPEN	  = 0x0004, /* open/close serial port */
+	DEBUG_INTR	  = 0x0008, /* interrupt processing */
+	DEBUG_INTR_DUMP   = 0x0010, /* Activating hexdump debug output on interrupt
+				      requests, not available as run-time option */
+	DEBUG_CMD	  = 0x00020, /* sent/received LL commands */
+	DEBUG_STREAM	  = 0x00040, /* application data stream I/O events */
+	DEBUG_STREAM_DUMP = 0x00080, /* application data stream content */
+	DEBUG_LLDATA	  = 0x00100, /* sent/received LL data */
+	DEBUG_INTR_0	  = 0x00200, /* serial port output interrupt processing */
+	DEBUG_DRIVER	  = 0x00400, /* driver structure */
+	DEBUG_HDLC	  = 0x00800, /* M10x HDLC processing */
+	DEBUG_WRITE	  = 0x01000, /* M105 data write */
+	DEBUG_TRANSCMD    = 0x02000, /*AT-COMMANDS+RESPONSES*/
+	DEBUG_MCMD        = 0x04000, /*COMMANDS THAT ARE SENT VERY OFTEN*/
+	DEBUG_INIT	  = 0x08000, /* (de)allocation+initialization of data structures */
+	DEBUG_LOCK	  = 0x10000, /* semaphore operations */
+	DEBUG_OUTPUT	  = 0x20000, /* output to device */
+	DEBUG_ISO         = 0x40000, /* isochronous transfers */
+	DEBUG_IF	  = 0x80000, /* character device operations */
+	DEBUG_USBREQ	  = 0x100000, /* USB communication (except payload data) */
+	DEBUG_LOCKCMD     = 0x200000, /* AT commands and responses when MS_LOCKED */
+
+	DEBUG_ANY	  = 0x3fffff, /* print message if any of the others is activated */
+};
+
+#ifdef CONFIG_GIGASET_DEBUG
+#define DEBUG_DEFAULT (DEBUG_INIT | DEBUG_TRANSCMD | DEBUG_CMD | DEBUG_USBREQ)
+//#define DEBUG_DEFAULT (DEBUG_LOCK | DEBUG_INIT | DEBUG_TRANSCMD | DEBUG_CMD | DEBUF_IF | DEBUG_DRIVER | DEBUG_OUTPUT | DEBUG_INTR)
+#else
+#define DEBUG_DEFAULT 0
+#endif
+
+/* redefine syslog macros to prepend module name instead of entire source path */
+/* The space before the comma in ", ##" is needed by gcc 2.95 */
+#undef info
+#define info(format, arg...) printk(KERN_INFO "%s: " format "\n", THIS_MODULE ? THIS_MODULE->name : "gigaset_hw" , ## arg)
+
+#undef notice
+#define notice(format, arg...) printk(KERN_NOTICE "%s: " format "\n", THIS_MODULE ? THIS_MODULE->name : "gigaset_hw" , ## arg)
+
+#undef warn
+#define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n", THIS_MODULE ? THIS_MODULE->name : "gigaset_hw" , ## arg)
+
+#undef err
+#define err(format, arg...) printk(KERN_ERR "%s: " format "\n", THIS_MODULE ? THIS_MODULE->name : "gigaset_hw" , ## arg)
+
+#undef dbg
+#ifdef CONFIG_GIGASET_DEBUG
+#define dbg(level, format, arg...) do { if (unlikely(((enum debuglevel)gigaset_debuglevel) & (level))) \
+	printk(KERN_DEBUG "%s: " format "\n", THIS_MODULE ? THIS_MODULE->name : "gigaset_hw" , ## arg); } while (0)
+#else
+#define dbg(level, format, arg...) do {} while (0)
+#endif
+
+void gigaset_dbg_buffer(enum debuglevel level, const unsigned char *msg,
+                        size_t len, const unsigned char *buf, int from_user);
+
+/* connection state */
+#define ZSAU_NONE			0
+#define ZSAU_DISCONNECT_IND		4
+#define ZSAU_OUTGOING_CALL_PROCEEDING	1
+#define ZSAU_PROCEEDING			1
+#define ZSAU_CALL_DELIVERED		2
+#define ZSAU_ACTIVE			3
+#define ZSAU_NULL			5
+#define ZSAU_DISCONNECT_REQ		6
+#define ZSAU_UNKNOWN			-1
+
+/* USB control transfer requests */
+#define OUT_VENDOR_REQ			(USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_ENDPOINT)
+#define IN_VENDOR_REQ			(USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_ENDPOINT)
+
+/* int-in-events 3070 */
+#define HD_B1_FLOW_CONTROL		0x80
+#define HD_B2_FLOW_CONTROL		0x81
+#define HD_RECEIVEATDATA_ACK		(0x35)		// 3070		// att: HD_RECEIVE>>AT<<DATA_ACK
+#define HD_READY_SEND_ATDATA		(0x36)		// 3070
+#define HD_OPEN_ATCHANNEL_ACK		(0x37)		// 3070
+#define HD_CLOSE_ATCHANNEL_ACK		(0x38)		// 3070
+#define HD_DEVICE_INIT_OK		(0x11)		// ISurf USB + 3070
+#define HD_OPEN_B1CHANNEL_ACK		(0x51)		// ISurf USB + 3070
+#define HD_OPEN_B2CHANNEL_ACK		(0x52)		// ISurf USB + 3070
+#define HD_CLOSE_B1CHANNEL_ACK		(0x53)		// ISurf USB + 3070
+#define HD_CLOSE_B2CHANNEL_ACK		(0x54)		// ISurf USB + 3070
+// 	 Powermangment
+#define HD_SUSPEND_END			(0x61)		// ISurf USB
+//   Configuration
+#define HD_RESET_INTERRUPT_PIPE_ACK	(0xFF)		// ISurf USB + 3070
+
+/* control requests 3070 */
+#define	HD_OPEN_B1CHANNEL		(0x23)		// ISurf USB + 3070
+#define	HD_CLOSE_B1CHANNEL		(0x24)		// ISurf USB + 3070
+#define	HD_OPEN_B2CHANNEL		(0x25)		// ISurf USB + 3070
+#define	HD_CLOSE_B2CHANNEL		(0x26)		// ISurf USB + 3070
+#define HD_RESET_INTERRUPT_PIPE		(0x27)		// ISurf USB + 3070
+#define	HD_DEVICE_INIT_ACK		(0x34)		// ISurf USB + 3070
+#define	HD_WRITE_ATMESSAGE		(0x12)		// 3070
+#define	HD_READ_ATMESSAGE		(0x13)		// 3070
+#define	HD_OPEN_ATCHANNEL		(0x28)		// 3070
+#define	HD_CLOSE_ATCHANNEL		(0x29)		// 3070
+
+/* USB frames for isochronous transfer */
+#define BAS_FRAMETIME	1		/* number of milliseconds between frames */
+#define BAS_NUMFRAMES	8		/* number of frames per URB */
+#define BAS_MAXFRAME	16		/* allocated bytes per frame */
+#define BAS_NORMFRAME	8		/* send size without flow control */
+#define BAS_HIGHFRAME	10		/* "    "    with positive flow control */
+#define BAS_LOWFRAME	5		/* "    "    with negative flow control */
+#define BAS_CORRFRAMES	4		/* flow control multiplicator */
+
+#define BAS_INBUFSIZE	(BAS_MAXFRAME * BAS_NUMFRAMES) /* size of isochronous input buffer per URB */
+#define BAS_OUTBUFSIZE	4096		/* size of common isochronous output buffer */
+#define BAS_OUTBUFPAD	BAS_MAXFRAME	/* size of pad area for isochronous output buffer */
+
+#define BAS_INURBS	3
+#define BAS_OUTURBS	3
+
+/* variable commands in struct bc_state */
+#define AT_ISO		0
+#define AT_DIAL		1
+#define AT_MSN		2
+#define AT_BC		3
+#define AT_PROTO	4
+#define AT_TYPE		5
+#define AT_HLC		6
+#define AT_NUM		7
+
+/* variables in struct at_state_t */
+#define VAR_ZSAU   0
+#define VAR_ZDLE   1
+#define VAR_ZVLS   2
+#define VAR_ZCTP   3
+#define VAR_NUM    4
+
+#define STR_NMBR   0
+#define STR_ZCPN   1
+#define STR_ZCON   2
+#define STR_ZBC    3
+#define STR_ZHLC   4
+#define STR_NUM    5
+
+#define EV_TIMEOUT      -105
+#define EV_IF_VER       -106
+#define EV_PROC_CIDMODE -107
+#define EV_SHUTDOWN     -108
+#define EV_START        -110
+#define EV_STOP         -111
+#define EV_IF_LOCK      -112
+#define EV_PROTO_L2     -113
+#define EV_ACCEPT       -114
+#define EV_DIAL         -115
+#define EV_HUP          -116
+#define EV_BC_OPEN      -117
+#define EV_BC_CLOSED    -118
+
+/* input state */
+#define INS_command     0x0001
+#define INS_DLE_char    0x0002
+#define INS_byte_stuff  0x0004
+#define INS_have_data   0x0008
+#define INS_skip_frame  0x0010
+#define INS_DLE_command 0x0020
+#define INS_flag_hunt	0x0040
+
+/* channel state */
+#define CHS_D_UP	0x01
+#define CHS_B_UP	0x02
+#define CHS_NOTIFY_LL	0x04
+
+#define ICALL_REJECT  0
+#define ICALL_ACCEPT  1
+#define ICALL_IGNORE  2
+
+/* device state */
+#define MS_UNINITIALIZED        0
+#define MS_INIT                 1
+#define MS_LOCKED               2
+#define MS_SHUTDOWN             3
+#define MS_RECOVER              4
+#define MS_READY                5
+
+/* mode */
+#define M_UNKNOWN       0
+#define M_CONFIG        1
+#define M_UNIMODEM      2
+#define M_CID           3
+
+/* start mode */
+#define SM_LOCKED       0
+#define SM_ISDN         1 /* default */
+
+struct gigaset_ops;
+struct gigaset_driver;
+
+struct usb_cardstate;
+struct ser_cardstate;
+struct bas_cardstate;
+
+struct bc_state;
+struct usb_bc_state;
+struct ser_bc_state;
+struct bas_bc_state;
+
+struct reply_t {
+	int	resp_code;      /* RSP_XXXX */
+	int	min_ConState;   /* <0 => ignore */
+	int	max_ConState;   /* <0 => ignore */
+	int	parameter;      /* e.g. ZSAU_XXXX <0: ignore*/
+	int	new_ConState;   /* <0 => ignore */
+	int	timeout;        /* >0 => *HZ; <=0 => TOUT_XXXX*/
+	int	action[MAXACT]; /* ACT_XXXX */
+	char *command;        /* NULL==none */
+};
+
+extern struct reply_t gigaset_tab_cid_m10x[];
+extern struct reply_t gigaset_tab_nocid_m10x[];
+
+struct inbuf_t {
+	unsigned char           *rcvbuf;                /* usb-gigaset receive buffer */
+	struct bc_state		*bcs;
+	struct cardstate *cs;
+	int inputstate;
+
+	atomic_t head, tail;
+	unsigned char data[RBUFSIZE];
+};
+
+/* isochronous write buffer structure
+ * circular buffer with pad area for extraction of complete USB frames
+ * - data[read..nextread-1] is valid data already submitted to the USB subsystem
+ * - data[nextread..write-1] is valid data yet to be sent
+ * - data[write] is the next byte to write to
+ *   - in byte-oriented L2 procotols, it is completely free
+ *   - in bit-oriented L2 procotols, it may contain a partial byte of valid data
+ * - data[write+1..read-1] is free
+ * - wbits is the number of valid data bits in data[write], starting at the LSB
+ * - writesem is the semaphore for writing to the buffer:
+ *   if writesem <= 0, data[write..read-1] is currently being written to
+ * - idle contains the byte value to repeat when the end of valid data is
+ *   reached; if nextread==write (buffer contains no data to send), either the
+ *   BAS_OUTBUFPAD bytes immediately before data[write] (if write>=BAS_OUTBUFPAD)
+ *   or those of the pad area (if write<BAS_OUTBUFPAD) are also filled with that
+ *   value
+ * - optionally, the following statistics on the buffer's usage can be collected:
+ *   maxfill: maximum number of bytes occupied
+ *   idlefills: number of times a frame of idle bytes is prepared
+ *   emptygets: number of times the buffer was empty when a data frame was requested
+ *   backtoback: number of times two data packets were entered into the buffer
+ *    without intervening idle flags
+ *   nakedback: set if no idle flags have been inserted since the last data packet
+ */
+struct isowbuf_t {
+	atomic_t	read;
+	atomic_t	nextread;
+	atomic_t	write;
+	atomic_t	writesem;
+	int		wbits;
+	unsigned char	data[BAS_OUTBUFSIZE + BAS_OUTBUFPAD];
+	unsigned char	idle;
+};
+
+/* isochronous write URB context structure
+ * data to be stored along with the URB and retrieved when it is returned
+ * as completed by the USB subsystem
+ * - urb: pointer to the URB itself
+ * - bcs: pointer to the B Channel control structure
+ * - limit: end of write buffer area covered by this URB
+ */
+struct isow_urbctx_t {
+	struct urb *urb;
+	struct bc_state *bcs;
+	int limit;
+};
+
+/* AT state structure
+ * data associated with the state of an ISDN connection, whether or not
+ * it is currently assigned a B channel
+ */
+struct at_state_t {
+	struct list_head        list;
+	int                     waiting;
+	int                     getstring;
+	atomic_t		timer_index;
+	unsigned long		timer_expires;
+	int			timer_active;
+	unsigned int		ConState;                           /* State of connection */
+	struct reply_t          *replystruct;
+	int                     cid;
+	int                     int_var[VAR_NUM];   /* see VAR_XXXX */
+	char                    *str_var[STR_NUM];  /* see STR_XXXX */
+	unsigned                pending_commands;   /* see PC_XXXX */
+	atomic_t                seq_index;
+
+	struct cardstate    *cs;
+	struct bc_state         *bcs;
+};
+
+struct resp_type_t {
+	unsigned char	*response;
+	int		resp_code;           /* RSP_XXXX */
+	int		type;                /* RT_XXXX */
+};
+
+struct prot_skb {
+	atomic_t		empty;
+	struct semaphore	*sem;
+	struct sk_buff		*skb;
+};
+
+struct event_t {
+	int type;
+	void *ptr, *arg;
+	int parameter;
+	int cid;
+	struct at_state_t *at_state;
+};
+
+/* This buffer holds all information about the used B-Channel */
+struct bc_state {
+	struct sk_buff *tx_skb;                        /* Current transfer buffer to modem */
+	struct sk_buff_head squeue;	               /* B-Channel send Queue */
+
+	/* Variables for debugging .. */
+	int corrupted;                                   /* Counter for corrupted packages */
+	int trans_down;                                  /* Counter of packages (downstream) */
+	int trans_up;                                    /* Counter of packages (upstream) */
+
+	struct at_state_t at_state;
+	unsigned long rcvbytes;
+
+	__u16 fcs;
+	struct sk_buff *skb;
+	int inputstate; /* see INS_XXXX */
+
+	int channel;
+
+	struct cardstate *cs;
+
+	unsigned chstate;			/* bitmap (CHS_*) */
+	int ignore;
+	unsigned	proto2;			/* Layer 2 protocol (ISDN_PROTO_L2_*) */
+	char		*commands[AT_NUM]; /* see AT_XXXX */
+
+#ifdef CONFIG_GIGASET_DEBUG
+	int emptycount;
+#endif
+	int busy;
+	int use_count;
+
+	/* hardware drivers */
+	union {
+		struct ser_bc_state *ser;		 /* private data of serial hardware driver */
+		struct usb_bc_state *usb;		 /* private data of usb hardware driver */
+		struct bas_bc_state *bas;
+	} hw;
+};
+
+struct cardstate {
+	struct gigaset_driver *driver;
+	unsigned minor_index;
+
+	const struct gigaset_ops *ops;
+
+	/* Stuff to handle communication */
+	//wait_queue_head_t initwait;
+	wait_queue_head_t waitqueue;
+	int waiting;
+	atomic_t mode;                       /* see M_XXXX */
+	atomic_t mstate;                     /* Modem state: see MS_XXXX */
+	                                     /* only changed by the event layer */
+	int cmd_result;
+
+	int channels;
+	struct bc_state *bcs;                /* Array of struct bc_state */
+
+	int onechannel;                      /* data and commands transmitted in one stream (M10x) */
+
+	spinlock_t lock;
+	struct at_state_t at_state;          /* at_state_t for cid == 0 */
+	struct list_head temp_at_states;     /* list of temporary "struct at_state_t"s without B channel */
+
+	struct inbuf_t *inbuf;
+
+	struct cmdbuf_t *cmdbuf, *lastcmdbuf;
+	spinlock_t cmdlock;
+	unsigned curlen, cmdbytes;
+
+	unsigned open_count;
+	struct tty_struct *tty;
+	struct tasklet_struct if_wake_tasklet;
+	unsigned control_state;
+
+	unsigned fwver[4];
+	int gotfwver;
+
+	atomic_t running;                    /* !=0 if events are handled */
+	atomic_t connected;                  /* !=0 if hardware is connected */
+
+	atomic_t cidmode;
+
+	int myid;                            /* id for communication with LL */
+	isdn_if iif;
+
+	struct reply_t *tabnocid;
+	struct reply_t *tabcid;
+	int cs_init;
+	int ignoreframes;                    /* frames to ignore after setting up the B channel */
+	struct semaphore sem;                /* locks this structure: */
+	                                     /*   connected is not changed, */
+	                                     /*   hardware_up is not changed, */
+	                                     /*   MState is not changed to or from MS_LOCKED */
+
+	struct timer_list timer;
+	int retry_count;
+	int dle;                             /* !=0 if modem commands/responses are dle encoded */
+	int cur_at_seq;                      /* sequence of AT commands being processed */
+	int curchannel;                      /* channel, those commands are meant for */
+	atomic_t commands_pending;           /* flag(s) in xxx.commands_pending have been set */
+	struct tasklet_struct event_tasklet; /* tasklet for serializing AT commands. Scheduled
+	                                      *   -> for modem reponses (and incomming data for M10x)
+	                                      *   -> on timeout
+	                                      *   -> after setting bits in xxx.at_state.pending_command
+	                                      *      (e.g. command from LL) */
+	struct tasklet_struct write_tasklet; /* tasklet for serial output
+					      * (not used in base driver) */
+
+	/* event queue */
+	struct event_t events[MAX_EVENTS];
+	atomic_t ev_tail, ev_head;
+	spinlock_t ev_lock;
+
+	/* current modem response */
+	unsigned char respdata[MAX_RESP_SIZE];
+	unsigned cbytes;
+
+	/* hardware drivers */
+	union {
+		struct usb_cardstate *usb; /* private data of USB hardware driver */
+		struct ser_cardstate *ser; /* private data of serial hardware driver */
+		struct bas_cardstate *bas; /* private data of base hardware driver */
+	} hw;
+};
+
+struct gigaset_driver {
+	struct list_head list;
+	spinlock_t lock;                       /* locks minor tables and blocked */
+	//struct semaphore sem;                /* locks this structure */
+	struct tty_driver *tty;
+	unsigned have_tty;
+	unsigned minor;
+	unsigned minors;
+	struct cardstate *cs;
+	unsigned *flags;
+	int blocked;
+
+	const struct gigaset_ops *ops;
+	struct module *owner;
+};
+
+struct cmdbuf_t {
+	struct cmdbuf_t *next, *prev;
+	int len, offset;
+	struct tasklet_struct *wake_tasklet;
+	unsigned char buf[0];
+};
+
+struct bas_bc_state {
+	/* isochronous output state */
+	atomic_t	running;
+	atomic_t	corrbytes;
+	spinlock_t	isooutlock;
+	struct isow_urbctx_t	isoouturbs[BAS_OUTURBS];
+	struct isow_urbctx_t	*isooutdone, *isooutfree, *isooutovfl;
+	struct isowbuf_t	*isooutbuf;
+	unsigned numsub;			/* submitted URB counter (for diagnostic messages only) */
+	struct tasklet_struct	sent_tasklet;
+
+	/* isochronous input state */
+	spinlock_t isoinlock;
+	struct urb *isoinurbs[BAS_INURBS];
+	unsigned char isoinbuf[BAS_INBUFSIZE * BAS_INURBS];
+	struct urb *isoindone;	                /* completed isoc read URB */
+	int loststatus;				/* status of dropped URB */
+	unsigned isoinlost;			/* number of bytes lost */
+	/* state of bit unstuffing algorithm (in addition to BC_state.inputstate) */
+	unsigned seqlen;			/* number of '1' bits not yet unstuffed */
+	unsigned inbyte, inbits;		/* collected bits for next byte */
+	/* statistics */
+	unsigned goodbytes;			/* bytes correctly received */
+	unsigned alignerrs;			/* frames with incomplete byte at end */
+	unsigned fcserrs;			/* FCS errors */
+	unsigned frameerrs;			/* framing errors */
+	unsigned giants;			/* long frames */
+	unsigned runts;				/* short frames */
+	unsigned aborts;			/* HDLC aborts */
+	unsigned shared0s;			/* '0' bits shared between flags */
+	unsigned stolen0s;			/* '0' stuff bits also serving as leading flag bits */
+	struct tasklet_struct rcvd_tasklet;
+};
+
+struct gigaset_ops {
+	/* Called from ev-layer.c/interface.c for sending AT commands to the device */
+	int (*write_cmd)(struct cardstate *cs,
+	                 const unsigned char *buf, int len,
+	                 struct tasklet_struct *wake_tasklet);
+
+	/* Called from interface.c for additional device control */
+	int (*write_room)(struct cardstate *cs);
+	int (*chars_in_buffer)(struct cardstate *cs);
+	int (*brkchars)(struct cardstate *cs, const unsigned char buf[6]);
+
+	/* Called from ev-layer.c after setting up connection
+	 * Should call gigaset_bchannel_up(), when finished. */
+	int (*init_bchannel)(struct bc_state *bcs);
+
+	/* Called from ev-layer.c after hanging up
+	 * Should call gigaset_bchannel_down(), when finished. */
+	int (*close_bchannel)(struct bc_state *bcs);
+
+	/* Called by gigaset_initcs() for setting up bcs->hw.xxx */
+	int (*initbcshw)(struct bc_state *bcs);
+
+	/* Called by gigaset_freecs() for freeing bcs->hw.xxx */
+	int (*freebcshw)(struct bc_state *bcs);
+
+	/* Called by gigaset_stop() or gigaset_bchannel_down() for resetting bcs->hw.xxx */
+	void (*reinitbcshw)(struct bc_state *bcs);
+
+	/* Called by gigaset_initcs() for setting up cs->hw.xxx */
+	int (*initcshw)(struct cardstate *cs);
+
+	/* Called by gigaset_freecs() for freeing cs->hw.xxx */
+	void (*freecshw)(struct cardstate *cs);
+
+	///* Called by gigaset_stop() for killing URBs, shutting down the device, ...
+	//   hardwareup: ==0: don't try to shut down the device, hardware is really not accessible
+	//	       !=0: hardware still up */
+	//void (*stophw)(struct cardstate *cs, int hardwareup);
+
+	/* Called from common.c/interface.c for additional serial port control */
+	int (*set_modem_ctrl)(struct cardstate *cs, unsigned old_state, unsigned new_state);
+	int (*baud_rate)(struct cardstate *cs, unsigned cflag);
+	int (*set_line_ctrl)(struct cardstate *cs, unsigned cflag);
+
+	/* Called from i4l.c to put an skb into the send-queue. */
+	int (*send_skb)(struct bc_state *bcs, struct sk_buff *skb);
+
+	/* Called from ev-layer.c to process a block of data
+	 * received through the common/control channel. */
+	void (*handle_input)(struct inbuf_t *inbuf);
+
+};
+
+/* = Common structures and definitions ======================================= */
+
+/* Parser states for DLE-Event:
+ * <DLE-EVENT>: <DLE_FLAG> "X" <EVENT> <DLE_FLAG> "."
+ * <DLE_FLAG>:  0x10
+ * <EVENT>:     ((a-z)* | (A-Z)* | (0-10)*)+
+ */
+#define DLE_FLAG       0x10
+
+/* ===========================================================================
+ *  Functions implemented in asyncdata.c
+ */
+
+/* Called from i4l.c to put an skb into the send-queue.
+ * After sending gigaset_skb_sent() should be called. */
+int gigaset_m10x_send_skb(struct bc_state *bcs, struct sk_buff *skb);
+
+/* Called from ev-layer.c to process a block of data
+ * received through the common/control channel. */
+void gigaset_m10x_input(struct inbuf_t *inbuf);
+
+/* ===========================================================================
+ *  Functions implemented in isocdata.c
+ */
+
+/* Called from i4l.c to put an skb into the send-queue.
+ * After sending gigaset_skb_sent() should be called. */
+int gigaset_isoc_send_skb(struct bc_state *bcs, struct sk_buff *skb);
+
+/* Called from ev-layer.c to process a block of data
+ * received through the common/control channel. */
+void gigaset_isoc_input(struct inbuf_t *inbuf);
+
+/* Called from bas-gigaset.c to process a block of data
+ * received through the isochronous channel */
+void gigaset_isoc_receive(unsigned char *src, unsigned count, struct bc_state *bcs);
+
+/* Called from bas-gigaset.c to put a block of data
+ * into the isochronous output buffer */
+int gigaset_isoc_buildframe(struct bc_state *bcs, unsigned char *in, int len);
+
+/* Called from bas-gigaset.c to initialize the isochronous output buffer */
+void gigaset_isowbuf_init(struct isowbuf_t *iwb, unsigned char idle);
+
+/* Called from bas-gigaset.c to retrieve a block of bytes for sending */
+int gigaset_isowbuf_getbytes(struct isowbuf_t *iwb, int size);
+
+/* ===========================================================================
+ *  Functions implemented in i4l.c/gigaset.h
+ */
+
+/* Called by gigaset_initcs() for setting up with the isdn4linux subsystem */
+int gigaset_register_to_LL(struct cardstate *cs, const char *isdnid);
+
+/* Called from xxx-gigaset.c to indicate completion of sending an skb */
+void gigaset_skb_sent(struct bc_state *bcs, struct sk_buff *skb);
+
+/* Called from common.c/ev-layer.c to indicate events relevant to the LL */
+int gigaset_isdn_icall(struct at_state_t *at_state);
+int gigaset_isdn_setup_accept(struct at_state_t *at_state);
+int gigaset_isdn_setup_dial(struct at_state_t *at_state, void *data);
+
+void gigaset_i4l_cmd(struct cardstate *cs, int cmd);
+void gigaset_i4l_channel_cmd(struct bc_state *bcs, int cmd);
+
+
+static inline void gigaset_isdn_rcv_err(struct bc_state *bcs)
+{
+	isdn_ctrl response;
+
+	/* error -> LL */
+	dbg(DEBUG_CMD, "sending L1ERR");
+	response.driver = bcs->cs->myid;
+	response.command = ISDN_STAT_L1ERR;
+	response.arg = bcs->channel;
+	response.parm.errcode = ISDN_STAT_L1ERR_RECV;
+	bcs->cs->iif.statcallb(&response);
+}
+
+/* ===========================================================================
+ *  Functions implemented in ev-layer.c
+ */
+
+/* tasklet called from common.c to process queued events */
+void gigaset_handle_event(unsigned long data);
+
+/* called from isocdata.c / asyncdata.c
+ * when a complete modem response line has been received */
+void gigaset_handle_modem_response(struct cardstate *cs);
+
+/* ===========================================================================
+ *  Functions implemented in proc.c
+ */
+
+/* initialize sysfs for device */
+void gigaset_init_dev_sysfs(struct usb_interface *interface);
+void gigaset_free_dev_sysfs(struct usb_interface *interface);
+
+/* ===========================================================================
+ *  Functions implemented in common.c/gigaset.h
+ */
+
+void gigaset_bcs_reinit(struct bc_state *bcs);
+void gigaset_at_init(struct at_state_t *at_state, struct bc_state *bcs,
+                     struct cardstate *cs, int cid);
+int gigaset_get_channel(struct bc_state *bcs);
+void gigaset_free_channel(struct bc_state *bcs);
+int gigaset_get_channels(struct cardstate *cs);
+void gigaset_free_channels(struct cardstate *cs);
+void gigaset_block_channels(struct cardstate *cs);
+
+/* Allocate and initialize driver structure. */
+struct gigaset_driver *gigaset_initdriver(unsigned minor, unsigned minors,
+                                          const char *procname,
+                                          const char *devname,
+                                          const char *devfsname,
+                                          const struct gigaset_ops *ops,
+                                          struct module *owner);
+
+/* Deallocate driver structure. */
+void gigaset_freedriver(struct gigaset_driver *drv);
+void gigaset_debugdrivers(void);
+struct cardstate *gigaset_get_cs_by_minor(unsigned minor);
+struct cardstate *gigaset_get_cs_by_tty(struct tty_struct *tty);
+struct cardstate *gigaset_get_cs_by_id(int id);
+
+/* For drivers without fixed assignment device<->cardstate (usb) */
+struct cardstate *gigaset_getunassignedcs(struct gigaset_driver *drv);
+void gigaset_unassign(struct cardstate *cs);
+void gigaset_blockdriver(struct gigaset_driver *drv);
+
+/* Allocate and initialize card state. Calls hardware dependent gigaset_init[b]cs(). */
+struct cardstate *gigaset_initcs(struct gigaset_driver *drv, int channels,
+				 int onechannel, int ignoreframes,
+				 int cidmode, const char *modulename);
+
+/* Free card state. Calls hardware dependent gigaset_free[b]cs(). */
+void gigaset_freecs(struct cardstate *cs);
+
+/* Tell common.c that hardware and driver are ready. */
+int gigaset_start(struct cardstate *cs);
+
+/* Tell common.c that the device is not present any more. */
+void gigaset_stop(struct cardstate *cs);
+
+/* Tell common.c that the driver is being unloaded. */
+void gigaset_shutdown(struct cardstate *cs);
+
+/* Tell common.c that an skb has been sent. */
+void gigaset_skb_sent(struct bc_state *bcs, struct sk_buff *skb);
+
+/* Append event to the queue.
+ * Returns NULL on failure or a pointer to the event on success.
+ * ptr must be kmalloc()ed (and not be freed by the caller).
+ */
+struct event_t *gigaset_add_event(struct cardstate *cs,
+                                  struct at_state_t *at_state, int type,
+                                  void *ptr, int parameter, void *arg);
+
+/* Called on CONFIG1 command from frontend. */
+int gigaset_enterconfigmode(struct cardstate *cs); //0: success <0: errorcode
+
+/* cs->lock must not be locked */
+static inline void gigaset_schedule_event(struct cardstate *cs)
+{
+	unsigned long flags;
+	spin_lock_irqsave(&cs->lock, flags);
+	if (atomic_read(&cs->running))
+		tasklet_schedule(&cs->event_tasklet);
+	spin_unlock_irqrestore(&cs->lock, flags);
+}
+
+/* Tell common.c that B channel has been closed. */
+/* cs->lock must not be locked */
+static inline void gigaset_bchannel_down(struct bc_state *bcs)
+{
+	gigaset_add_event(bcs->cs, &bcs->at_state, EV_BC_CLOSED, NULL, 0, NULL);
+
+	dbg(DEBUG_CMD, "scheduling BC_CLOSED");
+	gigaset_schedule_event(bcs->cs);
+}
+
+/* Tell common.c that B channel has been opened. */
+/* cs->lock must not be locked */
+static inline void gigaset_bchannel_up(struct bc_state *bcs)
+{
+	gigaset_add_event(bcs->cs, &bcs->at_state, EV_BC_OPEN, NULL, 0, NULL);
+
+	dbg(DEBUG_CMD, "scheduling BC_OPEN");
+	gigaset_schedule_event(bcs->cs);
+}
+
+/* handling routines for sk_buff */
+/* ============================= */
+
+/* private version of __skb_put()
+ * append 'len' bytes to the content of 'skb', already knowing that the
+ * existing buffer can accomodate them
+ * returns a pointer to the location where the new bytes should be copied to
+ * This function does not take any locks so it must be called with the
+ * appropriate locks held only.
+ */
+static inline unsigned char *gigaset_skb_put_quick(struct sk_buff *skb,
+                                                   unsigned int len)
+{
+	unsigned char *tmp = skb->tail;
+	/*SKB_LINEAR_ASSERT(skb);*/		/* not needed here */
+	skb->tail += len;
+	skb->len += len;
+	return tmp;
+}
+
+/* pass received skb to LL
+ * Warning: skb must not be accessed anymore!
+ */
+static inline void gigaset_rcv_skb(struct sk_buff *skb,
+                                   struct cardstate *cs,
+                                   struct bc_state *bcs)
+{
+	cs->iif.rcvcallb_skb(cs->myid, bcs->channel, skb);
+	bcs->trans_down++;
+}
+
+/* handle reception of corrupted skb
+ * Warning: skb must not be accessed anymore!
+ */
+static inline void gigaset_rcv_error(struct sk_buff *procskb,
+                                     struct cardstate *cs,
+                                     struct bc_state *bcs)
+{
+	if (procskb)
+		dev_kfree_skb(procskb);
+
+	if (bcs->ignore)
+		--bcs->ignore;
+	else {
+		++bcs->corrupted;
+		gigaset_isdn_rcv_err(bcs);
+	}
+}
+
+
+/* bitwise byte inversion table */
+extern __u8 gigaset_invtab[];	/* in common.c */
+
+
+/* append received bytes to inbuf */
+static inline int gigaset_fill_inbuf(struct inbuf_t *inbuf,
+                                     const unsigned char *src,
+                                     unsigned numbytes)
+{
+	unsigned n, head, tail, bytesleft;
+
+	dbg(DEBUG_INTR, "received %u bytes", numbytes);
+
+	if (!numbytes)
+		return 0;
+
+	bytesleft = numbytes;
+	tail = atomic_read(&inbuf->tail);
+	head = atomic_read(&inbuf->head);
+	dbg(DEBUG_INTR, "buffer state: %u -> %u", head, tail);
+
+	while (bytesleft) {
+		if (head > tail)
+			n = head - 1 - tail;
+		else if (head == 0)
+			n = (RBUFSIZE-1) - tail;
+		else
+			n = RBUFSIZE - tail;
+		if (!n) {
+			err("buffer overflow (%u bytes lost)", bytesleft);
+			break;
+		}
+		if (n > bytesleft)
+			n = bytesleft;
+		memcpy(inbuf->data + tail, src, n);
+		bytesleft -= n;
+		tail = (tail + n) % RBUFSIZE;
+		src += n;
+	}
+	dbg(DEBUG_INTR, "setting tail to %u", tail);
+	atomic_set(&inbuf->tail, tail);
+	return numbytes != bytesleft;
+}
+
+/* ===========================================================================
+ *  Functions implemented in interface.c
+ */
+
+/* initialize interface */
+void gigaset_if_initdriver(struct gigaset_driver *drv, const char *procname,
+                           const char *devname, const char *devfsname);
+/* release interface */
+void gigaset_if_freedriver(struct gigaset_driver *drv);
+/* add minor */
+void gigaset_if_init(struct cardstate *cs);
+/* remove minor */
+void gigaset_if_free(struct cardstate *cs);
+/* device received data */
+void gigaset_if_receive(struct cardstate *cs,
+                        unsigned char *buffer, size_t len);
+
+#endif