Initial import

1 files changed, 1157 insertions, 0 deletions

diff --git a/drivers/isdn/gigaset/common.c b/drivers/isdn/gigaset/common.c
new file mode 100644
index 000000000..7c7814497
--- /dev/null
+++ b/drivers/isdn/gigaset/common.c
@@ -0,0 +1,1157 @@
+/*
+ * Stuff used by all variants of the driver
+ *
+ * Copyright (c) 2001 by Stefan Eilers,
+ *                       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.
+ * =====================================================================
+ */
+
+#include "gigaset.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"
+#define DRIVER_DESC "Driver for Gigaset 307x"
+
+#ifdef CONFIG_GIGASET_DEBUG
+#define DRIVER_DESC_DEBUG " (debug build)"
+#else
+#define DRIVER_DESC_DEBUG ""
+#endif
+
+/* Module parameters */
+int gigaset_debuglevel;
+EXPORT_SYMBOL_GPL(gigaset_debuglevel);
+module_param_named(debug, gigaset_debuglevel, int, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug, "debug level");
+
+/* driver state flags */
+#define VALID_MINOR	0x01
+#define VALID_ID	0x02
+
+/**
+ * gigaset_dbg_buffer() - dump data in ASCII and hex for debugging
+ * @level:	debugging level.
+ * @msg:	message prefix.
+ * @len:	number of bytes to dump.
+ * @buf:	data to dump.
+ *
+ * If the current debugging level includes one of the bits set in @level,
+ * @len bytes starting at @buf are logged to dmesg at KERN_DEBUG prio,
+ * prefixed by the text @msg.
+ */
+void gigaset_dbg_buffer(enum debuglevel level, const unsigned char *msg,
+			size_t len, const unsigned char *buf)
+{
+	unsigned char outbuf[80];
+	unsigned char c;
+	size_t space = sizeof outbuf - 1;
+	unsigned char *out = outbuf;
+	size_t numin = len;
+
+	while (numin--) {
+		c = *buf++;
+		if (c == '~' || c == '^' || c == '\\') {
+			if (!space--)
+				break;
+			*out++ = '\\';
+		}
+		if (c & 0x80) {
+			if (!space--)
+				break;
+			*out++ = '~';
+			c ^= 0x80;
+		}
+		if (c < 0x20 || c == 0x7f) {
+			if (!space--)
+				break;
+			*out++ = '^';
+			c ^= 0x40;
+		}
+		if (!space--)
+			break;
+		*out++ = c;
+	}
+	*out = 0;
+
+	gig_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;
+
+	cs->control_state = TIOCM_RTS;
+
+	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:
+	dev_err(cs->dev, "error %d on setuartbits\n", -r);
+	cs->control_state = TIOCM_RTS | TIOCM_DTR;
+	cs->ops->set_modem_ctrl(cs, 0, TIOCM_RTS | TIOCM_DTR);
+
+	return -1;
+}
+
+static int test_timeout(struct at_state_t *at_state)
+{
+	if (!at_state->timer_expires)
+		return 0;
+
+	if (--at_state->timer_expires) {
+		gig_dbg(DEBUG_MCMD, "decreased timer of %p to %lu",
+			at_state, at_state->timer_expires);
+		return 0;
+	}
+
+	gigaset_add_event(at_state->cs, at_state, EV_TIMEOUT, NULL,
+			  at_state->timer_index, NULL);
+	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 (cs->running) {
+		mod_timer(&cs->timer, jiffies + msecs_to_jiffies(GIG_TICK));
+		if (timeout) {
+			gig_dbg(DEBUG_EVENT, "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 || !try_module_get(bcs->cs->driver->owner)) {
+		gig_dbg(DEBUG_CHANNEL, "could not allocate channel %d",
+			bcs->channel);
+		spin_unlock_irqrestore(&bcs->cs->lock, flags);
+		return -EBUSY;
+	}
+	++bcs->use_count;
+	bcs->busy = 1;
+	gig_dbg(DEBUG_CHANNEL, "allocated channel %d", bcs->channel);
+	spin_unlock_irqrestore(&bcs->cs->lock, flags);
+	return 0;
+}
+
+struct bc_state *gigaset_get_free_channel(struct cardstate *cs)
+{
+	unsigned long flags;
+	int i;
+
+	spin_lock_irqsave(&cs->lock, flags);
+	if (!try_module_get(cs->driver->owner)) {
+		gig_dbg(DEBUG_CHANNEL,
+			"could not get module for allocating channel");
+		spin_unlock_irqrestore(&cs->lock, flags);
+		return NULL;
+	}
+	for (i = 0; i < cs->channels; ++i)
+		if (!cs->bcs[i].use_count) {
+			++cs->bcs[i].use_count;
+			cs->bcs[i].busy = 1;
+			spin_unlock_irqrestore(&cs->lock, flags);
+			gig_dbg(DEBUG_CHANNEL, "allocated channel %d", i);
+			return cs->bcs + i;
+		}
+	module_put(cs->driver->owner);
+	spin_unlock_irqrestore(&cs->lock, flags);
+	gig_dbg(DEBUG_CHANNEL, "no free channel");
+	return NULL;
+}
+
+void gigaset_free_channel(struct bc_state *bcs)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&bcs->cs->lock, flags);
+	if (!bcs->busy) {
+		gig_dbg(DEBUG_CHANNEL, "could not free channel %d",
+			bcs->channel);
+		spin_unlock_irqrestore(&bcs->cs->lock, flags);
+		return;
+	}
+	--bcs->use_count;
+	bcs->busy = 0;
+	module_put(bcs->cs->driver->owner);
+	gig_dbg(DEBUG_CHANNEL, "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);
+			gig_dbg(DEBUG_CHANNEL,
+				"could not allocate all channels");
+			return -EBUSY;
+		}
+	for (i = 0; i < cs->channels; ++i)
+		++cs->bcs[i].use_count;
+	spin_unlock_irqrestore(&cs->lock, flags);
+
+	gig_dbg(DEBUG_CHANNEL, "allocated all channels");
+
+	return 0;
+}
+
+void gigaset_free_channels(struct cardstate *cs)
+{
+	unsigned long flags;
+	int i;
+
+	gig_dbg(DEBUG_CHANNEL, "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;
+
+	gig_dbg(DEBUG_CHANNEL, "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;
+	unsigned long flags;
+
+	spin_lock_irqsave(&cs->ev_lock, flags);
+
+	head = cs->ev_head;
+	tail = cs->ev_tail;
+
+	while (tail != head) {
+		ev = cs->events + head;
+		kfree(ev->ptr);
+		head = (head + 1) % MAX_EVENTS;
+	}
+
+	cs->ev_head = tail;
+
+	spin_unlock_irqrestore(&cs->ev_lock, flags);
+}
+
+/**
+ * gigaset_add_event() - add event to device event queue
+ * @cs:		device descriptor structure.
+ * @at_state:	connection state structure.
+ * @type:	event type.
+ * @ptr:	pointer parameter for event.
+ * @parameter:	integer parameter for event.
+ * @arg:	pointer parameter for event.
+ *
+ * Allocate an event queue entry from the device's event queue, and set it up
+ * with the parameters given.
+ *
+ * Return value: added event
+ */
+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;
+
+	gig_dbg(DEBUG_EVENT, "queueing event %d", type);
+
+	spin_lock_irqsave(&cs->ev_lock, flags);
+
+	tail = cs->ev_tail;
+	next = (tail + 1) % MAX_EVENTS;
+	if (unlikely(next == cs->ev_head))
+		dev_err(cs->dev, "event queue full\n");
+	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;
+		cs->ev_tail = next;
+	}
+
+	spin_unlock_irqrestore(&cs->ev_lock, flags);
+
+	return event;
+}
+EXPORT_SYMBOL_GPL(gigaset_add_event);
+
+static void clear_at_state(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 dealloc_temp_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);
+		clear_at_state(cur);
+		kfree(cur);
+	}
+}
+
+static void gigaset_freebcs(struct bc_state *bcs)
+{
+	int i;
+
+	gig_dbg(DEBUG_INIT, "freeing bcs[%d]->hw", bcs->channel);
+	bcs->cs->ops->freebcshw(bcs);
+
+	gig_dbg(DEBUG_INIT, "clearing bcs[%d]->at_state", bcs->channel);
+	clear_at_state(&bcs->at_state);
+	gig_dbg(DEBUG_INIT, "freeing bcs[%d]->skb", bcs->channel);
+	dev_kfree_skb(bcs->rx_skb);
+	bcs->rx_skb = NULL;
+
+	for (i = 0; i < AT_NUM; ++i) {
+		kfree(bcs->commands[i]);
+		bcs->commands[i] = NULL;
+	}
+}
+
+static struct cardstate *alloc_cs(struct gigaset_driver *drv)
+{
+	unsigned long flags;
+	unsigned i;
+	struct cardstate *cs;
+	struct cardstate *ret = NULL;
+
+	spin_lock_irqsave(&drv->lock, flags);
+	if (drv->blocked)
+		goto exit;
+	for (i = 0; i < drv->minors; ++i) {
+		cs = drv->cs + i;
+		if (!(cs->flags & VALID_MINOR)) {
+			cs->flags = VALID_MINOR;
+			ret = cs;
+			break;
+		}
+	}
+exit:
+	spin_unlock_irqrestore(&drv->lock, flags);
+	return ret;
+}
+
+static void free_cs(struct cardstate *cs)
+{
+	cs->flags = 0;
+}
+
+static void make_valid(struct cardstate *cs, unsigned mask)
+{
+	unsigned long flags;
+	struct gigaset_driver *drv = cs->driver;
+	spin_lock_irqsave(&drv->lock, flags);
+	cs->flags |= 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);
+	cs->flags &= ~mask;
+	spin_unlock_irqrestore(&drv->lock, flags);
+}
+
+/**
+ * gigaset_freecs() - free all associated ressources of a device
+ * @cs:		device descriptor structure.
+ *
+ * Stops all tasklets and timers, unregisters the device from all
+ * subsystems it was registered to, deallocates the device structure
+ * @cs and all structures referenced from it.
+ * Operations on the device should be stopped before calling this.
+ */
+void gigaset_freecs(struct cardstate *cs)
+{
+	int i;
+	unsigned long flags;
+
+	if (!cs)
+		return;
+
+	mutex_lock(&cs->mutex);
+
+	spin_lock_irqsave(&cs->lock, flags);
+	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:
+		/* clear B channel structures */
+		for (i = 0; i < cs->channels; ++i) {
+			gig_dbg(DEBUG_INIT, "clearing bcs[%d]", i);
+			gigaset_freebcs(cs->bcs + i);
+		}
+
+		/* clear device sysfs */
+		gigaset_free_dev_sysfs(cs);
+
+		gigaset_if_free(cs);
+
+		gig_dbg(DEBUG_INIT, "clearing hw");
+		cs->ops->freecshw(cs);
+
+		/* fall through */
+	case 2: /* error in initcshw */
+		/* Deregister from LL */
+		make_invalid(cs, VALID_ID);
+		gigaset_isdn_unregdev(cs);
+
+		/* fall through */
+	case 1: /* error when registering to LL */
+		gig_dbg(DEBUG_INIT, "clearing at_state");
+		clear_at_state(&cs->at_state);
+		dealloc_temp_at_states(cs);
+		clear_events(cs);
+		tty_port_destroy(&cs->port);
+
+		/* fall through */
+	case 0:	/* error in basic setup */
+		gig_dbg(DEBUG_INIT, "freeing inbuf");
+		kfree(cs->inbuf);
+		kfree(cs->bcs);
+	}
+
+	mutex_unlock(&cs->mutex);
+	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;
+	at_state->timer_index = 0;
+	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 cardstate *cs)
+/* inbuf->read must be allocated before! */
+{
+	inbuf->head = 0;
+	inbuf->tail = 0;
+	inbuf->cs = cs;
+	inbuf->inputstate = INS_command;
+}
+
+/**
+ * gigaset_fill_inbuf() - append received data to input buffer
+ * @inbuf:	buffer structure.
+ * @src:	received data.
+ * @numbytes:	number of bytes received.
+ *
+ * Return value: !=0 if some data was appended
+ */
+int gigaset_fill_inbuf(struct inbuf_t *inbuf, const unsigned char *src,
+		       unsigned numbytes)
+{
+	unsigned n, head, tail, bytesleft;
+
+	gig_dbg(DEBUG_INTR, "received %u bytes", numbytes);
+
+	if (!numbytes)
+		return 0;
+
+	bytesleft = numbytes;
+	tail = inbuf->tail;
+	head = inbuf->head;
+	gig_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) {
+			dev_err(inbuf->cs->dev,
+				"buffer overflow (%u bytes lost)\n",
+				bytesleft);
+			break;
+		}
+		if (n > bytesleft)
+			n = bytesleft;
+		memcpy(inbuf->data + tail, src, n);
+		bytesleft -= n;
+		tail = (tail + n) % RBUFSIZE;
+		src += n;
+	}
+	gig_dbg(DEBUG_INTR, "setting tail to %u", tail);
+	inbuf->tail = tail;
+	return numbytes != bytesleft;
+}
+EXPORT_SYMBOL_GPL(gigaset_fill_inbuf);
+
+/* Initialize the b-channel structure */
+static int gigaset_initbcs(struct bc_state *bcs, struct cardstate *cs,
+			   int channel)
+{
+	int i;
+
+	bcs->tx_skb = NULL;
+
+	skb_queue_head_init(&bcs->squeue);
+
+	bcs->corrupted = 0;
+	bcs->trans_down = 0;
+	bcs->trans_up = 0;
+
+	gig_dbg(DEBUG_INIT, "setting up bcs[%d]->at_state", channel);
+	gigaset_at_init(&bcs->at_state, bcs, cs, -1);
+
+#ifdef CONFIG_GIGASET_DEBUG
+	bcs->emptycount = 0;
+#endif
+
+	bcs->rx_bufsize = 0;
+	bcs->rx_skb = NULL;
+	bcs->rx_fcs = PPP_INITFCS;
+	bcs->inputstate = 0;
+	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;
+
+	spin_lock_init(&bcs->aplock);
+	bcs->ap = NULL;
+	bcs->apconnstate = 0;
+
+	gig_dbg(DEBUG_INIT, "  setting up bcs[%d]->hw", channel);
+	return cs->ops->initbcshw(bcs);
+}
+
+/**
+ * gigaset_initcs() - initialize device structure
+ * @drv:	hardware driver the device belongs to
+ * @channels:	number of B channels supported by device
+ * @onechannel:	!=0 if B channel data and AT commands share one
+ *		    communication channel (M10x),
+ *		==0 if B channels have separate communication channels (base)
+ * @ignoreframes:	number of frames to ignore after setting up B channel
+ * @cidmode:	!=0: start in CallID mode
+ * @modulename:	name of driver module for LL registration
+ *
+ * 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
+ *
+ * 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;
+	unsigned long flags;
+	int i;
+
+	gig_dbg(DEBUG_INIT, "allocating cs");
+	cs = alloc_cs(drv);
+	if (!cs) {
+		pr_err("maximum number of devices exceeded\n");
+		return NULL;
+	}
+
+	cs->cs_init = 0;
+	cs->channels = channels;
+	cs->onechannel = onechannel;
+	cs->ignoreframes = ignoreframes;
+	INIT_LIST_HEAD(&cs->temp_at_states);
+	cs->running = 0;
+	init_timer(&cs->timer); /* clear next & prev */
+	spin_lock_init(&cs->ev_lock);
+	cs->ev_tail = 0;
+	cs->ev_head = 0;
+
+	tasklet_init(&cs->event_tasklet, gigaset_handle_event,
+		     (unsigned long) cs);
+	tty_port_init(&cs->port);
+	cs->commands_pending = 0;
+	cs->cur_at_seq = 0;
+	cs->gotfwver = -1;
+	cs->dev = NULL;
+	cs->tty_dev = NULL;
+	cs->cidmode = cidmode != 0;
+	cs->tabnocid = gigaset_tab_nocid;
+	cs->tabcid = gigaset_tab_cid;
+
+	init_waitqueue_head(&cs->waitqueue);
+	cs->waiting = 0;
+
+	cs->mode = M_UNKNOWN;
+	cs->mstate = MS_UNINITIALIZED;
+
+	cs->bcs = kmalloc(channels * sizeof(struct bc_state), GFP_KERNEL);
+	cs->inbuf = kmalloc(sizeof(struct inbuf_t), GFP_KERNEL);
+	if (!cs->bcs || !cs->inbuf) {
+		pr_err("out of memory\n");
+		goto error;
+	}
+	++cs->cs_init;
+
+	gig_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;
+
+	gig_dbg(DEBUG_INIT, "setting up inbuf");
+	gigaset_inbuf_init(cs->inbuf, cs);
+
+	cs->connected = 0;
+	cs->isdn_up = 0;
+
+	gig_dbg(DEBUG_INIT, "setting up cmdbuf");
+	cs->cmdbuf = cs->lastcmdbuf = NULL;
+	spin_lock_init(&cs->cmdlock);
+	cs->curlen = 0;
+	cs->cmdbytes = 0;
+
+	gig_dbg(DEBUG_INIT, "setting up iif");
+	if (gigaset_isdn_regdev(cs, modulename) < 0) {
+		pr_err("error registering ISDN device\n");
+		goto error;
+	}
+
+	make_valid(cs, VALID_ID);
+	++cs->cs_init;
+	gig_dbg(DEBUG_INIT, "setting up hw");
+	if (cs->ops->initcshw(cs) < 0)
+		goto error;
+
+	++cs->cs_init;
+
+	/* set up character device */
+	gigaset_if_init(cs);
+
+	/* set up device sysfs */
+	gigaset_init_dev_sysfs(cs);
+
+	/* set up channel data structures */
+	for (i = 0; i < channels; ++i) {
+		gig_dbg(DEBUG_INIT, "setting up bcs[%d]", i);
+		if (gigaset_initbcs(cs->bcs + i, cs, i) < 0) {
+			pr_err("could not allocate channel %d data\n", i);
+			goto error;
+		}
+	}
+
+	spin_lock_irqsave(&cs->lock, flags);
+	cs->running = 1;
+	spin_unlock_irqrestore(&cs->lock, flags);
+	setup_timer(&cs->timer, timer_tick, (unsigned long) cs);
+	cs->timer.expires = jiffies + msecs_to_jiffies(GIG_TICK);
+	add_timer(&cs->timer);
+
+	gig_dbg(DEBUG_INIT, "cs initialized");
+	return cs;
+
+error:
+	gig_dbg(DEBUG_INIT, "failed");
+	gigaset_freecs(cs);
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(gigaset_initcs);
+
+/* ReInitialize the b-channel structure on hangup */
+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);
+	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->rx_fcs = PPP_INITFCS;
+	bcs->chstate = 0;
+
+	bcs->ignore = cs->ignoreframes;
+	dev_kfree_skb(bcs->rx_skb);
+	bcs->rx_skb = NULL;
+
+	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);
+
+	cs->mode = M_UNKNOWN;
+	cs->mstate = MS_UNINITIALIZED;
+
+	clear_at_state(&cs->at_state);
+	dealloc_temp_at_states(cs);
+	gigaset_at_init(&cs->at_state, NULL, cs, 0);
+
+	cs->inbuf->inputstate = INS_command;
+	cs->inbuf->head = 0;
+	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;
+	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) < 0)
+			pr_err("could not allocate channel %d data\n", i);
+	}
+
+	if (cs->waiting) {
+		cs->cmd_result = -ENODEV;
+		cs->waiting = 0;
+		wake_up_interruptible(&cs->waitqueue);
+	}
+}
+
+
+/**
+ * gigaset_start() - start device operations
+ * @cs:		device descriptor structure.
+ *
+ * Prepares the device for use by setting up communication parameters,
+ * scheduling an EV_START event to initiate device initialization, and
+ * waiting for completion of the initialization.
+ *
+ * Return value:
+ *	0 on success, error code < 0 on failure
+ */
+int gigaset_start(struct cardstate *cs)
+{
+	unsigned long flags;
+
+	if (mutex_lock_interruptible(&cs->mutex))
+		return -EBUSY;
+
+	spin_lock_irqsave(&cs->lock, flags);
+	cs->connected = 1;
+	spin_unlock_irqrestore(&cs->lock, flags);
+
+	if (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;
+	}
+
+	cs->waiting = 1;
+
+	if (!gigaset_add_event(cs, &cs->at_state, EV_START, NULL, 0, NULL)) {
+		cs->waiting = 0;
+		goto error;
+	}
+	gigaset_schedule_event(cs);
+
+	wait_event(cs->waitqueue, !cs->waiting);
+
+	mutex_unlock(&cs->mutex);
+	return 0;
+
+error:
+	mutex_unlock(&cs->mutex);
+	return -ENOMEM;
+}
+EXPORT_SYMBOL_GPL(gigaset_start);
+
+/**
+ * gigaset_shutdown() - shut down device operations
+ * @cs:		device descriptor structure.
+ *
+ * Deactivates the device by scheduling an EV_SHUTDOWN event and
+ * waiting for completion of the shutdown.
+ *
+ * Return value:
+ *	0 - success, -ENODEV - error (no device associated)
+ */
+int gigaset_shutdown(struct cardstate *cs)
+{
+	mutex_lock(&cs->mutex);
+
+	if (!(cs->flags & VALID_MINOR)) {
+		mutex_unlock(&cs->mutex);
+		return -ENODEV;
+	}
+
+	cs->waiting = 1;
+
+	if (!gigaset_add_event(cs, &cs->at_state, EV_SHUTDOWN, NULL, 0, NULL))
+		goto exit;
+	gigaset_schedule_event(cs);
+
+	wait_event(cs->waitqueue, !cs->waiting);
+
+	cleanup_cs(cs);
+
+exit:
+	mutex_unlock(&cs->mutex);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(gigaset_shutdown);
+
+/**
+ * gigaset_stop() - stop device operations
+ * @cs:		device descriptor structure.
+ *
+ * Stops operations on the device by scheduling an EV_STOP event and
+ * waiting for completion of the shutdown.
+ */
+void gigaset_stop(struct cardstate *cs)
+{
+	mutex_lock(&cs->mutex);
+
+	cs->waiting = 1;
+
+	if (!gigaset_add_event(cs, &cs->at_state, EV_STOP, NULL, 0, NULL))
+		goto exit;
+	gigaset_schedule_event(cs);
+
+	wait_event(cs->waitqueue, !cs->waiting);
+
+	cleanup_cs(cs);
+
+exit:
+	mutex_unlock(&cs->mutex);
+}
+EXPORT_SYMBOL_GPL(gigaset_stop);
+
+static LIST_HEAD(drivers);
+static DEFINE_SPINLOCK(driver_lock);
+
+struct cardstate *gigaset_get_cs_by_id(int id)
+{
+	unsigned long flags;
+	struct cardstate *ret = NULL;
+	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) {
+			cs = drv->cs + i;
+			if ((cs->flags & VALID_ID) && cs->myid == id) {
+				ret = cs;
+				break;
+			}
+		}
+		spin_unlock(&drv->lock);
+		if (ret)
+			break;
+	}
+	spin_unlock_irqrestore(&driver_lock, flags);
+	return ret;
+}
+
+static struct cardstate *gigaset_get_cs_by_minor(unsigned minor)
+{
+	unsigned long flags;
+	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->cs[index].flags & VALID_MINOR)
+			ret = drv->cs + index;
+		spin_unlock(&drv->lock);
+		if (ret)
+			break;
+	}
+	spin_unlock_irqrestore(&driver_lock, flags);
+	return ret;
+}
+
+struct cardstate *gigaset_get_cs_by_tty(struct tty_struct *tty)
+{
+	return gigaset_get_cs_by_minor(tty->index + tty->driver->minor_start);
+}
+
+/**
+ * gigaset_freedriver() - free all associated ressources of a driver
+ * @drv:	driver descriptor structure.
+ *
+ * Unregisters the driver from the system and deallocates the driver
+ * structure @drv and all structures referenced from it.
+ * All devices should be shut down before calling this.
+ */
+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);
+
+	kfree(drv->cs);
+	kfree(drv);
+}
+EXPORT_SYMBOL_GPL(gigaset_freedriver);
+
+/**
+ * gigaset_initdriver() - initialize driver structure
+ * @minor:	First minor number
+ * @minors:	Number of minors this driver can handle
+ * @procname:	Name of the driver
+ * @devname:	Name of the device files (prefix without minor number)
+ *
+ * Allocate and initialize gigaset_driver structure. Initialize interface.
+ *
+ * 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 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;
+
+	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 error;
+
+	for (i = 0; i < minors; ++i) {
+		drv->cs[i].flags = 0;
+		drv->cs[i].driver = drv;
+		drv->cs[i].ops = drv->ops;
+		drv->cs[i].minor_index = i;
+		mutex_init(&drv->cs[i].mutex);
+	}
+
+	gigaset_if_initdriver(drv, procname, devname);
+
+	spin_lock_irqsave(&driver_lock, flags);
+	list_add(&drv->list, &drivers);
+	spin_unlock_irqrestore(&driver_lock, flags);
+
+	return drv;
+
+error:
+	kfree(drv);
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(gigaset_initdriver);
+
+/**
+ * gigaset_blockdriver() - block driver
+ * @drv:	driver descriptor structure.
+ *
+ * Prevents the driver from attaching new devices, in preparation for
+ * deregistration.
+ */
+void gigaset_blockdriver(struct gigaset_driver *drv)
+{
+	drv->blocked = 1;
+}
+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;
+
+	pr_info(DRIVER_DESC DRIVER_DESC_DEBUG "\n");
+	gigaset_isdn_regdrv();
+	return 0;
+}
+
+static void __exit gigaset_exit_module(void)
+{
+	gigaset_isdn_unregdrv();
+}
+
+module_init(gigaset_init_module);
+module_exit(gigaset_exit_module);
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+
+MODULE_LICENSE("GPL");