Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 1316 insertions, 0 deletions

diff --git a/kernel/drivers/isdn/capi/kcapi.c b/kernel/drivers/isdn/capi/kcapi.c
new file mode 100644
index 000000000..823f6985b
--- /dev/null
+++ b/kernel/drivers/isdn/capi/kcapi.c
@@ -0,0 +1,1316 @@
+/* $Id: kcapi.c,v 1.1.2.8 2004/03/26 19:57:20 armin Exp $
+ *
+ * Kernel CAPI 2.0 Module
+ *
+ * Copyright 1999 by Carsten Paeth <calle@calle.de>
+ * Copyright 2002 by Kai Germaschewski <kai@germaschewski.name>
+ *
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License, incorporated herein by reference.
+ *
+ */
+
+#define AVMB1_COMPAT
+
+#include "kcapi.h"
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/proc_fs.h>
+#include <linux/sched.h>
+#include <linux/seq_file.h>
+#include <linux/skbuff.h>
+#include <linux/workqueue.h>
+#include <linux/capi.h>
+#include <linux/kernelcapi.h>
+#include <linux/init.h>
+#include <linux/moduleparam.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <asm/uaccess.h>
+#include <linux/isdn/capicmd.h>
+#include <linux/isdn/capiutil.h>
+#ifdef AVMB1_COMPAT
+#include <linux/b1lli.h>
+#endif
+#include <linux/mutex.h>
+#include <linux/rcupdate.h>
+
+static int showcapimsgs = 0;
+static struct workqueue_struct *kcapi_wq;
+
+MODULE_DESCRIPTION("CAPI4Linux: kernel CAPI layer");
+MODULE_AUTHOR("Carsten Paeth");
+MODULE_LICENSE("GPL");
+module_param(showcapimsgs, uint, 0);
+
+/* ------------------------------------------------------------- */
+
+struct capictr_event {
+	struct work_struct work;
+	unsigned int type;
+	u32 controller;
+};
+
+/* ------------------------------------------------------------- */
+
+static struct capi_version driver_version = {2, 0, 1, 1 << 4};
+static char driver_serial[CAPI_SERIAL_LEN] = "0004711";
+static char capi_manufakturer[64] = "AVM Berlin";
+
+#define NCCI2CTRL(ncci)    (((ncci) >> 24) & 0x7f)
+
+LIST_HEAD(capi_drivers);
+DEFINE_MUTEX(capi_drivers_lock);
+
+struct capi_ctr *capi_controller[CAPI_MAXCONTR];
+DEFINE_MUTEX(capi_controller_lock);
+
+struct capi20_appl *capi_applications[CAPI_MAXAPPL];
+
+static int ncontrollers;
+
+static BLOCKING_NOTIFIER_HEAD(ctr_notifier_list);
+
+/* -------- controller ref counting -------------------------------------- */
+
+static inline struct capi_ctr *
+capi_ctr_get(struct capi_ctr *ctr)
+{
+	if (!try_module_get(ctr->owner))
+		return NULL;
+	return ctr;
+}
+
+static inline void
+capi_ctr_put(struct capi_ctr *ctr)
+{
+	module_put(ctr->owner);
+}
+
+/* ------------------------------------------------------------- */
+
+static inline struct capi_ctr *get_capi_ctr_by_nr(u16 contr)
+{
+	if (contr < 1 || contr - 1 >= CAPI_MAXCONTR)
+		return NULL;
+
+	return capi_controller[contr - 1];
+}
+
+static inline struct capi20_appl *__get_capi_appl_by_nr(u16 applid)
+{
+	lockdep_assert_held(&capi_controller_lock);
+
+	if (applid < 1 || applid - 1 >= CAPI_MAXAPPL)
+		return NULL;
+
+	return capi_applications[applid - 1];
+}
+
+static inline struct capi20_appl *get_capi_appl_by_nr(u16 applid)
+{
+	if (applid < 1 || applid - 1 >= CAPI_MAXAPPL)
+		return NULL;
+
+	return rcu_dereference(capi_applications[applid - 1]);
+}
+
+/* -------- util functions ------------------------------------ */
+
+static inline int capi_cmd_valid(u8 cmd)
+{
+	switch (cmd) {
+	case CAPI_ALERT:
+	case CAPI_CONNECT:
+	case CAPI_CONNECT_ACTIVE:
+	case CAPI_CONNECT_B3_ACTIVE:
+	case CAPI_CONNECT_B3:
+	case CAPI_CONNECT_B3_T90_ACTIVE:
+	case CAPI_DATA_B3:
+	case CAPI_DISCONNECT_B3:
+	case CAPI_DISCONNECT:
+	case CAPI_FACILITY:
+	case CAPI_INFO:
+	case CAPI_LISTEN:
+	case CAPI_MANUFACTURER:
+	case CAPI_RESET_B3:
+	case CAPI_SELECT_B_PROTOCOL:
+		return 1;
+	}
+	return 0;
+}
+
+static inline int capi_subcmd_valid(u8 subcmd)
+{
+	switch (subcmd) {
+	case CAPI_REQ:
+	case CAPI_CONF:
+	case CAPI_IND:
+	case CAPI_RESP:
+		return 1;
+	}
+	return 0;
+}
+
+/* ------------------------------------------------------------ */
+
+static void
+register_appl(struct capi_ctr *ctr, u16 applid, capi_register_params *rparam)
+{
+	ctr = capi_ctr_get(ctr);
+
+	if (ctr)
+		ctr->register_appl(ctr, applid, rparam);
+	else
+		printk(KERN_WARNING "%s: cannot get controller resources\n",
+		       __func__);
+}
+
+
+static void release_appl(struct capi_ctr *ctr, u16 applid)
+{
+	DBG("applid %#x", applid);
+
+	ctr->release_appl(ctr, applid);
+	capi_ctr_put(ctr);
+}
+
+static void notify_up(u32 contr)
+{
+	struct capi20_appl *ap;
+	struct capi_ctr *ctr;
+	u16 applid;
+
+	mutex_lock(&capi_controller_lock);
+
+	if (showcapimsgs & 1)
+		printk(KERN_DEBUG "kcapi: notify up contr %d\n", contr);
+
+	ctr = get_capi_ctr_by_nr(contr);
+	if (ctr) {
+		if (ctr->state == CAPI_CTR_RUNNING)
+			goto unlock_out;
+
+		ctr->state = CAPI_CTR_RUNNING;
+
+		for (applid = 1; applid <= CAPI_MAXAPPL; applid++) {
+			ap = __get_capi_appl_by_nr(applid);
+			if (ap)
+				register_appl(ctr, applid, &ap->rparam);
+		}
+
+		wake_up_interruptible_all(&ctr->state_wait_queue);
+	} else
+		printk(KERN_WARNING "%s: invalid contr %d\n", __func__, contr);
+
+unlock_out:
+	mutex_unlock(&capi_controller_lock);
+}
+
+static void ctr_down(struct capi_ctr *ctr, int new_state)
+{
+	struct capi20_appl *ap;
+	u16 applid;
+
+	if (ctr->state == CAPI_CTR_DETECTED || ctr->state == CAPI_CTR_DETACHED)
+		return;
+
+	ctr->state = new_state;
+
+	memset(ctr->manu, 0, sizeof(ctr->manu));
+	memset(&ctr->version, 0, sizeof(ctr->version));
+	memset(&ctr->profile, 0, sizeof(ctr->profile));
+	memset(ctr->serial, 0, sizeof(ctr->serial));
+
+	for (applid = 1; applid <= CAPI_MAXAPPL; applid++) {
+		ap = __get_capi_appl_by_nr(applid);
+		if (ap)
+			capi_ctr_put(ctr);
+	}
+
+	wake_up_interruptible_all(&ctr->state_wait_queue);
+}
+
+static void notify_down(u32 contr)
+{
+	struct capi_ctr *ctr;
+
+	mutex_lock(&capi_controller_lock);
+
+	if (showcapimsgs & 1)
+		printk(KERN_DEBUG "kcapi: notify down contr %d\n", contr);
+
+	ctr = get_capi_ctr_by_nr(contr);
+	if (ctr)
+		ctr_down(ctr, CAPI_CTR_DETECTED);
+	else
+		printk(KERN_WARNING "%s: invalid contr %d\n", __func__, contr);
+
+	mutex_unlock(&capi_controller_lock);
+}
+
+static int
+notify_handler(struct notifier_block *nb, unsigned long val, void *v)
+{
+	u32 contr = (long)v;
+
+	switch (val) {
+	case CAPICTR_UP:
+		notify_up(contr);
+		break;
+	case CAPICTR_DOWN:
+		notify_down(contr);
+		break;
+	}
+	return NOTIFY_OK;
+}
+
+static void do_notify_work(struct work_struct *work)
+{
+	struct capictr_event *event =
+		container_of(work, struct capictr_event, work);
+
+	blocking_notifier_call_chain(&ctr_notifier_list, event->type,
+				     (void *)(long)event->controller);
+	kfree(event);
+}
+
+/*
+ * The notifier will result in adding/deleteing of devices. Devices can
+ * only removed in user process, not in bh.
+ */
+static int notify_push(unsigned int event_type, u32 controller)
+{
+	struct capictr_event *event = kmalloc(sizeof(*event), GFP_ATOMIC);
+
+	if (!event)
+		return -ENOMEM;
+
+	INIT_WORK(&event->work, do_notify_work);
+	event->type = event_type;
+	event->controller = controller;
+
+	queue_work(kcapi_wq, &event->work);
+	return 0;
+}
+
+int register_capictr_notifier(struct notifier_block *nb)
+{
+	return blocking_notifier_chain_register(&ctr_notifier_list, nb);
+}
+EXPORT_SYMBOL_GPL(register_capictr_notifier);
+
+int unregister_capictr_notifier(struct notifier_block *nb)
+{
+	return blocking_notifier_chain_unregister(&ctr_notifier_list, nb);
+}
+EXPORT_SYMBOL_GPL(unregister_capictr_notifier);
+
+/* -------- Receiver ------------------------------------------ */
+
+static void recv_handler(struct work_struct *work)
+{
+	struct sk_buff *skb;
+	struct capi20_appl *ap =
+		container_of(work, struct capi20_appl, recv_work);
+
+	if ((!ap) || (ap->release_in_progress))
+		return;
+
+	mutex_lock(&ap->recv_mtx);
+	while ((skb = skb_dequeue(&ap->recv_queue))) {
+		if (CAPIMSG_CMD(skb->data) == CAPI_DATA_B3_IND)
+			ap->nrecvdatapkt++;
+		else
+			ap->nrecvctlpkt++;
+
+		ap->recv_message(ap, skb);
+	}
+	mutex_unlock(&ap->recv_mtx);
+}
+
+/**
+ * capi_ctr_handle_message() - handle incoming CAPI message
+ * @ctr:	controller descriptor structure.
+ * @appl:	application ID.
+ * @skb:	message.
+ *
+ * Called by hardware driver to pass a CAPI message to the application.
+ */
+
+void capi_ctr_handle_message(struct capi_ctr *ctr, u16 appl,
+			     struct sk_buff *skb)
+{
+	struct capi20_appl *ap;
+	int showctl = 0;
+	u8 cmd, subcmd;
+	_cdebbuf *cdb;
+
+	if (ctr->state != CAPI_CTR_RUNNING) {
+		cdb = capi_message2str(skb->data);
+		if (cdb) {
+			printk(KERN_INFO "kcapi: controller [%03d] not active, got: %s",
+			       ctr->cnr, cdb->buf);
+			cdebbuf_free(cdb);
+		} else
+			printk(KERN_INFO "kcapi: controller [%03d] not active, cannot trace\n",
+			       ctr->cnr);
+		goto error;
+	}
+
+	cmd = CAPIMSG_COMMAND(skb->data);
+	subcmd = CAPIMSG_SUBCOMMAND(skb->data);
+	if (cmd == CAPI_DATA_B3 && subcmd == CAPI_IND) {
+		ctr->nrecvdatapkt++;
+		if (ctr->traceflag > 2)
+			showctl |= 2;
+	} else {
+		ctr->nrecvctlpkt++;
+		if (ctr->traceflag)
+			showctl |= 2;
+	}
+	showctl |= (ctr->traceflag & 1);
+	if (showctl & 2) {
+		if (showctl & 1) {
+			printk(KERN_DEBUG "kcapi: got [%03d] id#%d %s len=%u\n",
+			       ctr->cnr, CAPIMSG_APPID(skb->data),
+			       capi_cmd2str(cmd, subcmd),
+			       CAPIMSG_LEN(skb->data));
+		} else {
+			cdb = capi_message2str(skb->data);
+			if (cdb) {
+				printk(KERN_DEBUG "kcapi: got [%03d] %s\n",
+				       ctr->cnr, cdb->buf);
+				cdebbuf_free(cdb);
+			} else
+				printk(KERN_DEBUG "kcapi: got [%03d] id#%d %s len=%u, cannot trace\n",
+				       ctr->cnr, CAPIMSG_APPID(skb->data),
+				       capi_cmd2str(cmd, subcmd),
+				       CAPIMSG_LEN(skb->data));
+		}
+
+	}
+
+	rcu_read_lock();
+	ap = get_capi_appl_by_nr(CAPIMSG_APPID(skb->data));
+	if (!ap) {
+		rcu_read_unlock();
+		cdb = capi_message2str(skb->data);
+		if (cdb) {
+			printk(KERN_ERR "kcapi: handle_message: applid %d state released (%s)\n",
+			       CAPIMSG_APPID(skb->data), cdb->buf);
+			cdebbuf_free(cdb);
+		} else
+			printk(KERN_ERR "kcapi: handle_message: applid %d state released (%s) cannot trace\n",
+			       CAPIMSG_APPID(skb->data),
+			       capi_cmd2str(cmd, subcmd));
+		goto error;
+	}
+	skb_queue_tail(&ap->recv_queue, skb);
+	queue_work(kcapi_wq, &ap->recv_work);
+	rcu_read_unlock();
+
+	return;
+
+error:
+	kfree_skb(skb);
+}
+
+EXPORT_SYMBOL(capi_ctr_handle_message);
+
+/**
+ * capi_ctr_ready() - signal CAPI controller ready
+ * @ctr:	controller descriptor structure.
+ *
+ * Called by hardware driver to signal that the controller is up and running.
+ */
+
+void capi_ctr_ready(struct capi_ctr *ctr)
+{
+	printk(KERN_NOTICE "kcapi: controller [%03d] \"%s\" ready.\n",
+	       ctr->cnr, ctr->name);
+
+	notify_push(CAPICTR_UP, ctr->cnr);
+}
+
+EXPORT_SYMBOL(capi_ctr_ready);
+
+/**
+ * capi_ctr_down() - signal CAPI controller not ready
+ * @ctr:	controller descriptor structure.
+ *
+ * Called by hardware driver to signal that the controller is down and
+ * unavailable for use.
+ */
+
+void capi_ctr_down(struct capi_ctr *ctr)
+{
+	printk(KERN_NOTICE "kcapi: controller [%03d] down.\n", ctr->cnr);
+
+	notify_push(CAPICTR_DOWN, ctr->cnr);
+}
+
+EXPORT_SYMBOL(capi_ctr_down);
+
+/**
+ * capi_ctr_suspend_output() - suspend controller
+ * @ctr:	controller descriptor structure.
+ *
+ * Called by hardware driver to stop data flow.
+ *
+ * Note: The caller is responsible for synchronizing concurrent state changes
+ * as well as invocations of capi_ctr_handle_message.
+ */
+
+void capi_ctr_suspend_output(struct capi_ctr *ctr)
+{
+	if (!ctr->blocked) {
+		printk(KERN_DEBUG "kcapi: controller [%03d] suspend\n",
+		       ctr->cnr);
+		ctr->blocked = 1;
+	}
+}
+
+EXPORT_SYMBOL(capi_ctr_suspend_output);
+
+/**
+ * capi_ctr_resume_output() - resume controller
+ * @ctr:	controller descriptor structure.
+ *
+ * Called by hardware driver to resume data flow.
+ *
+ * Note: The caller is responsible for synchronizing concurrent state changes
+ * as well as invocations of capi_ctr_handle_message.
+ */
+
+void capi_ctr_resume_output(struct capi_ctr *ctr)
+{
+	if (ctr->blocked) {
+		printk(KERN_DEBUG "kcapi: controller [%03d] resumed\n",
+		       ctr->cnr);
+		ctr->blocked = 0;
+	}
+}
+
+EXPORT_SYMBOL(capi_ctr_resume_output);
+
+/* ------------------------------------------------------------- */
+
+/**
+ * attach_capi_ctr() - register CAPI controller
+ * @ctr:	controller descriptor structure.
+ *
+ * Called by hardware driver to register a controller with the CAPI subsystem.
+ * Return value: 0 on success, error code < 0 on error
+ */
+
+int attach_capi_ctr(struct capi_ctr *ctr)
+{
+	int i;
+
+	mutex_lock(&capi_controller_lock);
+
+	for (i = 0; i < CAPI_MAXCONTR; i++) {
+		if (!capi_controller[i])
+			break;
+	}
+	if (i == CAPI_MAXCONTR) {
+		mutex_unlock(&capi_controller_lock);
+		printk(KERN_ERR "kcapi: out of controller slots\n");
+		return -EBUSY;
+	}
+	capi_controller[i] = ctr;
+
+	ctr->nrecvctlpkt = 0;
+	ctr->nrecvdatapkt = 0;
+	ctr->nsentctlpkt = 0;
+	ctr->nsentdatapkt = 0;
+	ctr->cnr = i + 1;
+	ctr->state = CAPI_CTR_DETECTED;
+	ctr->blocked = 0;
+	ctr->traceflag = showcapimsgs;
+	init_waitqueue_head(&ctr->state_wait_queue);
+
+	sprintf(ctr->procfn, "capi/controllers/%d", ctr->cnr);
+	ctr->procent = proc_create_data(ctr->procfn, 0, NULL, ctr->proc_fops, ctr);
+
+	ncontrollers++;
+
+	mutex_unlock(&capi_controller_lock);
+
+	printk(KERN_NOTICE "kcapi: controller [%03d]: %s attached\n",
+	       ctr->cnr, ctr->name);
+	return 0;
+}
+
+EXPORT_SYMBOL(attach_capi_ctr);
+
+/**
+ * detach_capi_ctr() - unregister CAPI controller
+ * @ctr:	controller descriptor structure.
+ *
+ * Called by hardware driver to remove the registration of a controller
+ * with the CAPI subsystem.
+ * Return value: 0 on success, error code < 0 on error
+ */
+
+int detach_capi_ctr(struct capi_ctr *ctr)
+{
+	int err = 0;
+
+	mutex_lock(&capi_controller_lock);
+
+	ctr_down(ctr, CAPI_CTR_DETACHED);
+
+	if (capi_controller[ctr->cnr - 1] != ctr) {
+		err = -EINVAL;
+		goto unlock_out;
+	}
+	capi_controller[ctr->cnr - 1] = NULL;
+	ncontrollers--;
+
+	if (ctr->procent)
+		remove_proc_entry(ctr->procfn, NULL);
+
+	printk(KERN_NOTICE "kcapi: controller [%03d]: %s unregistered\n",
+	       ctr->cnr, ctr->name);
+
+unlock_out:
+	mutex_unlock(&capi_controller_lock);
+
+	return err;
+}
+
+EXPORT_SYMBOL(detach_capi_ctr);
+
+/**
+ * register_capi_driver() - register CAPI driver
+ * @driver:	driver descriptor structure.
+ *
+ * Called by hardware driver to register itself with the CAPI subsystem.
+ */
+
+void register_capi_driver(struct capi_driver *driver)
+{
+	mutex_lock(&capi_drivers_lock);
+	list_add_tail(&driver->list, &capi_drivers);
+	mutex_unlock(&capi_drivers_lock);
+}
+
+EXPORT_SYMBOL(register_capi_driver);
+
+/**
+ * unregister_capi_driver() - unregister CAPI driver
+ * @driver:	driver descriptor structure.
+ *
+ * Called by hardware driver to unregister itself from the CAPI subsystem.
+ */
+
+void unregister_capi_driver(struct capi_driver *driver)
+{
+	mutex_lock(&capi_drivers_lock);
+	list_del(&driver->list);
+	mutex_unlock(&capi_drivers_lock);
+}
+
+EXPORT_SYMBOL(unregister_capi_driver);
+
+/* ------------------------------------------------------------- */
+/* -------- CAPI2.0 Interface ---------------------------------- */
+/* ------------------------------------------------------------- */
+
+/**
+ * capi20_isinstalled() - CAPI 2.0 operation CAPI_INSTALLED
+ *
+ * Return value: CAPI result code (CAPI_NOERROR if at least one ISDN controller
+ *	is ready for use, CAPI_REGNOTINSTALLED otherwise)
+ */
+
+u16 capi20_isinstalled(void)
+{
+	u16 ret = CAPI_REGNOTINSTALLED;
+	int i;
+
+	mutex_lock(&capi_controller_lock);
+
+	for (i = 0; i < CAPI_MAXCONTR; i++)
+		if (capi_controller[i] &&
+		    capi_controller[i]->state == CAPI_CTR_RUNNING) {
+			ret = CAPI_NOERROR;
+			break;
+		}
+
+	mutex_unlock(&capi_controller_lock);
+
+	return ret;
+}
+
+EXPORT_SYMBOL(capi20_isinstalled);
+
+/**
+ * capi20_register() - CAPI 2.0 operation CAPI_REGISTER
+ * @ap:		CAPI application descriptor structure.
+ *
+ * Register an application's presence with CAPI.
+ * A unique application ID is assigned and stored in @ap->applid.
+ * After this function returns successfully, the message receive
+ * callback function @ap->recv_message() may be called at any time
+ * until capi20_release() has been called for the same @ap.
+ * Return value: CAPI result code
+ */
+
+u16 capi20_register(struct capi20_appl *ap)
+{
+	int i;
+	u16 applid;
+
+	DBG("");
+
+	if (ap->rparam.datablklen < 128)
+		return CAPI_LOGBLKSIZETOSMALL;
+
+	ap->nrecvctlpkt = 0;
+	ap->nrecvdatapkt = 0;
+	ap->nsentctlpkt = 0;
+	ap->nsentdatapkt = 0;
+	mutex_init(&ap->recv_mtx);
+	skb_queue_head_init(&ap->recv_queue);
+	INIT_WORK(&ap->recv_work, recv_handler);
+	ap->release_in_progress = 0;
+
+	mutex_lock(&capi_controller_lock);
+
+	for (applid = 1; applid <= CAPI_MAXAPPL; applid++) {
+		if (capi_applications[applid - 1] == NULL)
+			break;
+	}
+	if (applid > CAPI_MAXAPPL) {
+		mutex_unlock(&capi_controller_lock);
+		return CAPI_TOOMANYAPPLS;
+	}
+
+	ap->applid = applid;
+	capi_applications[applid - 1] = ap;
+
+	for (i = 0; i < CAPI_MAXCONTR; i++) {
+		if (!capi_controller[i] ||
+		    capi_controller[i]->state != CAPI_CTR_RUNNING)
+			continue;
+		register_appl(capi_controller[i], applid, &ap->rparam);
+	}
+
+	mutex_unlock(&capi_controller_lock);
+
+	if (showcapimsgs & 1) {
+		printk(KERN_DEBUG "kcapi: appl %d up\n", applid);
+	}
+
+	return CAPI_NOERROR;
+}
+
+EXPORT_SYMBOL(capi20_register);
+
+/**
+ * capi20_release() - CAPI 2.0 operation CAPI_RELEASE
+ * @ap:		CAPI application descriptor structure.
+ *
+ * Terminate an application's registration with CAPI.
+ * After this function returns successfully, the message receive
+ * callback function @ap->recv_message() will no longer be called.
+ * Return value: CAPI result code
+ */
+
+u16 capi20_release(struct capi20_appl *ap)
+{
+	int i;
+
+	DBG("applid %#x", ap->applid);
+
+	mutex_lock(&capi_controller_lock);
+
+	ap->release_in_progress = 1;
+	capi_applications[ap->applid - 1] = NULL;
+
+	synchronize_rcu();
+
+	for (i = 0; i < CAPI_MAXCONTR; i++) {
+		if (!capi_controller[i] ||
+		    capi_controller[i]->state != CAPI_CTR_RUNNING)
+			continue;
+		release_appl(capi_controller[i], ap->applid);
+	}
+
+	mutex_unlock(&capi_controller_lock);
+
+	flush_workqueue(kcapi_wq);
+	skb_queue_purge(&ap->recv_queue);
+
+	if (showcapimsgs & 1) {
+		printk(KERN_DEBUG "kcapi: appl %d down\n", ap->applid);
+	}
+
+	return CAPI_NOERROR;
+}
+
+EXPORT_SYMBOL(capi20_release);
+
+/**
+ * capi20_put_message() - CAPI 2.0 operation CAPI_PUT_MESSAGE
+ * @ap:		CAPI application descriptor structure.
+ * @skb:	CAPI message.
+ *
+ * Transfer a single message to CAPI.
+ * Return value: CAPI result code
+ */
+
+u16 capi20_put_message(struct capi20_appl *ap, struct sk_buff *skb)
+{
+	struct capi_ctr *ctr;
+	int showctl = 0;
+	u8 cmd, subcmd;
+
+	DBG("applid %#x", ap->applid);
+
+	if (ncontrollers == 0)
+		return CAPI_REGNOTINSTALLED;
+	if ((ap->applid == 0) || ap->release_in_progress)
+		return CAPI_ILLAPPNR;
+	if (skb->len < 12
+	    || !capi_cmd_valid(CAPIMSG_COMMAND(skb->data))
+	    || !capi_subcmd_valid(CAPIMSG_SUBCOMMAND(skb->data)))
+		return CAPI_ILLCMDORSUBCMDORMSGTOSMALL;
+
+	/*
+	 * The controller reference is protected by the existence of the
+	 * application passed to us. We assume that the caller properly
+	 * synchronizes this service with capi20_release.
+	 */
+	ctr = get_capi_ctr_by_nr(CAPIMSG_CONTROLLER(skb->data));
+	if (!ctr || ctr->state != CAPI_CTR_RUNNING)
+		return CAPI_REGNOTINSTALLED;
+	if (ctr->blocked)
+		return CAPI_SENDQUEUEFULL;
+
+	cmd = CAPIMSG_COMMAND(skb->data);
+	subcmd = CAPIMSG_SUBCOMMAND(skb->data);
+
+	if (cmd == CAPI_DATA_B3 && subcmd == CAPI_REQ) {
+		ctr->nsentdatapkt++;
+		ap->nsentdatapkt++;
+		if (ctr->traceflag > 2)
+			showctl |= 2;
+	} else {
+		ctr->nsentctlpkt++;
+		ap->nsentctlpkt++;
+		if (ctr->traceflag)
+			showctl |= 2;
+	}
+	showctl |= (ctr->traceflag & 1);
+	if (showctl & 2) {
+		if (showctl & 1) {
+			printk(KERN_DEBUG "kcapi: put [%03d] id#%d %s len=%u\n",
+			       CAPIMSG_CONTROLLER(skb->data),
+			       CAPIMSG_APPID(skb->data),
+			       capi_cmd2str(cmd, subcmd),
+			       CAPIMSG_LEN(skb->data));
+		} else {
+			_cdebbuf *cdb = capi_message2str(skb->data);
+			if (cdb) {
+				printk(KERN_DEBUG "kcapi: put [%03d] %s\n",
+				       CAPIMSG_CONTROLLER(skb->data),
+				       cdb->buf);
+				cdebbuf_free(cdb);
+			} else
+				printk(KERN_DEBUG "kcapi: put [%03d] id#%d %s len=%u cannot trace\n",
+				       CAPIMSG_CONTROLLER(skb->data),
+				       CAPIMSG_APPID(skb->data),
+				       capi_cmd2str(cmd, subcmd),
+				       CAPIMSG_LEN(skb->data));
+		}
+	}
+	return ctr->send_message(ctr, skb);
+}
+
+EXPORT_SYMBOL(capi20_put_message);
+
+/**
+ * capi20_get_manufacturer() - CAPI 2.0 operation CAPI_GET_MANUFACTURER
+ * @contr:	controller number.
+ * @buf:	result buffer (64 bytes).
+ *
+ * Retrieve information about the manufacturer of the specified ISDN controller
+ * or (for @contr == 0) the driver itself.
+ * Return value: CAPI result code
+ */
+
+u16 capi20_get_manufacturer(u32 contr, u8 *buf)
+{
+	struct capi_ctr *ctr;
+	u16 ret;
+
+	if (contr == 0) {
+		strlcpy(buf, capi_manufakturer, CAPI_MANUFACTURER_LEN);
+		return CAPI_NOERROR;
+	}
+
+	mutex_lock(&capi_controller_lock);
+
+	ctr = get_capi_ctr_by_nr(contr);
+	if (ctr && ctr->state == CAPI_CTR_RUNNING) {
+		strlcpy(buf, ctr->manu, CAPI_MANUFACTURER_LEN);
+		ret = CAPI_NOERROR;
+	} else
+		ret = CAPI_REGNOTINSTALLED;
+
+	mutex_unlock(&capi_controller_lock);
+	return ret;
+}
+
+EXPORT_SYMBOL(capi20_get_manufacturer);
+
+/**
+ * capi20_get_version() - CAPI 2.0 operation CAPI_GET_VERSION
+ * @contr:	controller number.
+ * @verp:	result structure.
+ *
+ * Retrieve version information for the specified ISDN controller
+ * or (for @contr == 0) the driver itself.
+ * Return value: CAPI result code
+ */
+
+u16 capi20_get_version(u32 contr, struct capi_version *verp)
+{
+	struct capi_ctr *ctr;
+	u16 ret;
+
+	if (contr == 0) {
+		*verp = driver_version;
+		return CAPI_NOERROR;
+	}
+
+	mutex_lock(&capi_controller_lock);
+
+	ctr = get_capi_ctr_by_nr(contr);
+	if (ctr && ctr->state == CAPI_CTR_RUNNING) {
+		memcpy(verp, &ctr->version, sizeof(capi_version));
+		ret = CAPI_NOERROR;
+	} else
+		ret = CAPI_REGNOTINSTALLED;
+
+	mutex_unlock(&capi_controller_lock);
+	return ret;
+}
+
+EXPORT_SYMBOL(capi20_get_version);
+
+/**
+ * capi20_get_serial() - CAPI 2.0 operation CAPI_GET_SERIAL_NUMBER
+ * @contr:	controller number.
+ * @serial:	result buffer (8 bytes).
+ *
+ * Retrieve the serial number of the specified ISDN controller
+ * or (for @contr == 0) the driver itself.
+ * Return value: CAPI result code
+ */
+
+u16 capi20_get_serial(u32 contr, u8 *serial)
+{
+	struct capi_ctr *ctr;
+	u16 ret;
+
+	if (contr == 0) {
+		strlcpy(serial, driver_serial, CAPI_SERIAL_LEN);
+		return CAPI_NOERROR;
+	}
+
+	mutex_lock(&capi_controller_lock);
+
+	ctr = get_capi_ctr_by_nr(contr);
+	if (ctr && ctr->state == CAPI_CTR_RUNNING) {
+		strlcpy(serial, ctr->serial, CAPI_SERIAL_LEN);
+		ret = CAPI_NOERROR;
+	} else
+		ret = CAPI_REGNOTINSTALLED;
+
+	mutex_unlock(&capi_controller_lock);
+	return ret;
+}
+
+EXPORT_SYMBOL(capi20_get_serial);
+
+/**
+ * capi20_get_profile() - CAPI 2.0 operation CAPI_GET_PROFILE
+ * @contr:	controller number.
+ * @profp:	result structure.
+ *
+ * Retrieve capability information for the specified ISDN controller
+ * or (for @contr == 0) the number of installed controllers.
+ * Return value: CAPI result code
+ */
+
+u16 capi20_get_profile(u32 contr, struct capi_profile *profp)
+{
+	struct capi_ctr *ctr;
+	u16 ret;
+
+	if (contr == 0) {
+		profp->ncontroller = ncontrollers;
+		return CAPI_NOERROR;
+	}
+
+	mutex_lock(&capi_controller_lock);
+
+	ctr = get_capi_ctr_by_nr(contr);
+	if (ctr && ctr->state == CAPI_CTR_RUNNING) {
+		memcpy(profp, &ctr->profile, sizeof(struct capi_profile));
+		ret = CAPI_NOERROR;
+	} else
+		ret = CAPI_REGNOTINSTALLED;
+
+	mutex_unlock(&capi_controller_lock);
+	return ret;
+}
+
+EXPORT_SYMBOL(capi20_get_profile);
+
+/* Must be called with capi_controller_lock held. */
+static int wait_on_ctr_state(struct capi_ctr *ctr, unsigned int state)
+{
+	DEFINE_WAIT(wait);
+	int retval = 0;
+
+	ctr = capi_ctr_get(ctr);
+	if (!ctr)
+		return -ESRCH;
+
+	for (;;) {
+		prepare_to_wait(&ctr->state_wait_queue, &wait,
+				TASK_INTERRUPTIBLE);
+
+		if (ctr->state == state)
+			break;
+		if (ctr->state == CAPI_CTR_DETACHED) {
+			retval = -ESRCH;
+			break;
+		}
+		if (signal_pending(current)) {
+			retval = -EINTR;
+			break;
+		}
+
+		mutex_unlock(&capi_controller_lock);
+		schedule();
+		mutex_lock(&capi_controller_lock);
+	}
+	finish_wait(&ctr->state_wait_queue, &wait);
+
+	capi_ctr_put(ctr);
+
+	return retval;
+}
+
+#ifdef AVMB1_COMPAT
+static int old_capi_manufacturer(unsigned int cmd, void __user *data)
+{
+	avmb1_loadandconfigdef ldef;
+	avmb1_extcarddef cdef;
+	avmb1_resetdef rdef;
+	capicardparams cparams;
+	struct capi_ctr *ctr;
+	struct capi_driver *driver = NULL;
+	capiloaddata ldata;
+	struct list_head *l;
+	int retval;
+
+	switch (cmd) {
+	case AVMB1_ADDCARD:
+	case AVMB1_ADDCARD_WITH_TYPE:
+		if (cmd == AVMB1_ADDCARD) {
+			if ((retval = copy_from_user(&cdef, data,
+						     sizeof(avmb1_carddef))))
+				return -EFAULT;
+			cdef.cardtype = AVM_CARDTYPE_B1;
+		} else {
+			if ((retval = copy_from_user(&cdef, data,
+						     sizeof(avmb1_extcarddef))))
+				return -EFAULT;
+		}
+		cparams.port = cdef.port;
+		cparams.irq = cdef.irq;
+		cparams.cardnr = cdef.cardnr;
+
+		mutex_lock(&capi_drivers_lock);
+
+		switch (cdef.cardtype) {
+		case AVM_CARDTYPE_B1:
+			list_for_each(l, &capi_drivers) {
+				driver = list_entry(l, struct capi_driver, list);
+				if (strcmp(driver->name, "b1isa") == 0)
+					break;
+			}
+			break;
+		case AVM_CARDTYPE_T1:
+			list_for_each(l, &capi_drivers) {
+				driver = list_entry(l, struct capi_driver, list);
+				if (strcmp(driver->name, "t1isa") == 0)
+					break;
+			}
+			break;
+		default:
+			driver = NULL;
+			break;
+		}
+		if (!driver) {
+			printk(KERN_ERR "kcapi: driver not loaded.\n");
+			retval = -EIO;
+		} else if (!driver->add_card) {
+			printk(KERN_ERR "kcapi: driver has no add card function.\n");
+			retval = -EIO;
+		} else
+			retval = driver->add_card(driver, &cparams);
+
+		mutex_unlock(&capi_drivers_lock);
+		return retval;
+
+	case AVMB1_LOAD:
+	case AVMB1_LOAD_AND_CONFIG:
+
+		if (cmd == AVMB1_LOAD) {
+			if (copy_from_user(&ldef, data,
+					   sizeof(avmb1_loaddef)))
+				return -EFAULT;
+			ldef.t4config.len = 0;
+			ldef.t4config.data = NULL;
+		} else {
+			if (copy_from_user(&ldef, data,
+					   sizeof(avmb1_loadandconfigdef)))
+				return -EFAULT;
+		}
+
+		mutex_lock(&capi_controller_lock);
+
+		ctr = get_capi_ctr_by_nr(ldef.contr);
+		if (!ctr) {
+			retval = -EINVAL;
+			goto load_unlock_out;
+		}
+
+		if (ctr->load_firmware == NULL) {
+			printk(KERN_DEBUG "kcapi: load: no load function\n");
+			retval = -ESRCH;
+			goto load_unlock_out;
+		}
+
+		if (ldef.t4file.len <= 0) {
+			printk(KERN_DEBUG "kcapi: load: invalid parameter: length of t4file is %d ?\n", ldef.t4file.len);
+			retval = -EINVAL;
+			goto load_unlock_out;
+		}
+		if (ldef.t4file.data == NULL) {
+			printk(KERN_DEBUG "kcapi: load: invalid parameter: dataptr is 0\n");
+			retval = -EINVAL;
+			goto load_unlock_out;
+		}
+
+		ldata.firmware.user = 1;
+		ldata.firmware.data = ldef.t4file.data;
+		ldata.firmware.len = ldef.t4file.len;
+		ldata.configuration.user = 1;
+		ldata.configuration.data = ldef.t4config.data;
+		ldata.configuration.len = ldef.t4config.len;
+
+		if (ctr->state != CAPI_CTR_DETECTED) {
+			printk(KERN_INFO "kcapi: load: contr=%d not in detect state\n", ldef.contr);
+			retval = -EBUSY;
+			goto load_unlock_out;
+		}
+		ctr->state = CAPI_CTR_LOADING;
+
+		retval = ctr->load_firmware(ctr, &ldata);
+		if (retval) {
+			ctr->state = CAPI_CTR_DETECTED;
+			goto load_unlock_out;
+		}
+
+		retval = wait_on_ctr_state(ctr, CAPI_CTR_RUNNING);
+
+	load_unlock_out:
+		mutex_unlock(&capi_controller_lock);
+		return retval;
+
+	case AVMB1_RESETCARD:
+		if (copy_from_user(&rdef, data, sizeof(avmb1_resetdef)))
+			return -EFAULT;
+
+		retval = 0;
+
+		mutex_lock(&capi_controller_lock);
+
+		ctr = get_capi_ctr_by_nr(rdef.contr);
+		if (!ctr) {
+			retval = -ESRCH;
+			goto reset_unlock_out;
+		}
+
+		if (ctr->state == CAPI_CTR_DETECTED)
+			goto reset_unlock_out;
+
+		if (ctr->reset_ctr == NULL) {
+			printk(KERN_DEBUG "kcapi: reset: no reset function\n");
+			retval = -ESRCH;
+			goto reset_unlock_out;
+		}
+
+		ctr->reset_ctr(ctr);
+
+		retval = wait_on_ctr_state(ctr, CAPI_CTR_DETECTED);
+
+	reset_unlock_out:
+		mutex_unlock(&capi_controller_lock);
+		return retval;
+	}
+	return -EINVAL;
+}
+#endif
+
+/**
+ * capi20_manufacturer() - CAPI 2.0 operation CAPI_MANUFACTURER
+ * @cmd:	command.
+ * @data:	parameter.
+ *
+ * Perform manufacturer specific command.
+ * Return value: CAPI result code
+ */
+
+int capi20_manufacturer(unsigned long cmd, void __user *data)
+{
+	struct capi_ctr *ctr;
+	int retval;
+
+	switch (cmd) {
+#ifdef AVMB1_COMPAT
+	case AVMB1_LOAD:
+	case AVMB1_LOAD_AND_CONFIG:
+	case AVMB1_RESETCARD:
+	case AVMB1_GET_CARDINFO:
+	case AVMB1_REMOVECARD:
+		return old_capi_manufacturer(cmd, data);
+#endif
+	case KCAPI_CMD_TRACE:
+	{
+		kcapi_flagdef fdef;
+
+		if (copy_from_user(&fdef, data, sizeof(kcapi_flagdef)))
+			return -EFAULT;
+
+		mutex_lock(&capi_controller_lock);
+
+		ctr = get_capi_ctr_by_nr(fdef.contr);
+		if (ctr) {
+			ctr->traceflag = fdef.flag;
+			printk(KERN_INFO "kcapi: contr [%03d] set trace=%d\n",
+			       ctr->cnr, ctr->traceflag);
+			retval = 0;
+		} else
+			retval = -ESRCH;
+
+		mutex_unlock(&capi_controller_lock);
+
+		return retval;
+	}
+	case KCAPI_CMD_ADDCARD:
+	{
+		struct list_head *l;
+		struct capi_driver *driver = NULL;
+		capicardparams cparams;
+		kcapi_carddef cdef;
+
+		if ((retval = copy_from_user(&cdef, data, sizeof(cdef))))
+			return -EFAULT;
+
+		cparams.port = cdef.port;
+		cparams.irq = cdef.irq;
+		cparams.membase = cdef.membase;
+		cparams.cardnr = cdef.cardnr;
+		cparams.cardtype = 0;
+		cdef.driver[sizeof(cdef.driver) - 1] = 0;
+
+		mutex_lock(&capi_drivers_lock);
+
+		list_for_each(l, &capi_drivers) {
+			driver = list_entry(l, struct capi_driver, list);
+			if (strcmp(driver->name, cdef.driver) == 0)
+				break;
+		}
+		if (driver == NULL) {
+			printk(KERN_ERR "kcapi: driver \"%s\" not loaded.\n",
+			       cdef.driver);
+			retval = -ESRCH;
+		} else if (!driver->add_card) {
+			printk(KERN_ERR "kcapi: driver \"%s\" has no add card function.\n", cdef.driver);
+			retval = -EIO;
+		} else
+			retval = driver->add_card(driver, &cparams);
+
+		mutex_unlock(&capi_drivers_lock);
+		return retval;
+	}
+
+	default:
+		printk(KERN_ERR "kcapi: manufacturer command %lu unknown.\n",
+		       cmd);
+		break;
+
+	}
+	return -EINVAL;
+}
+
+EXPORT_SYMBOL(capi20_manufacturer);
+
+/* ------------------------------------------------------------- */
+/* -------- Init & Cleanup ------------------------------------- */
+/* ------------------------------------------------------------- */
+
+/*
+ * init / exit functions
+ */
+
+static struct notifier_block capictr_nb = {
+	.notifier_call = notify_handler,
+	.priority = INT_MAX,
+};
+
+static int __init kcapi_init(void)
+{
+	int err;
+
+	kcapi_wq = alloc_workqueue("kcapi", 0, 0);
+	if (!kcapi_wq)
+		return -ENOMEM;
+
+	register_capictr_notifier(&capictr_nb);
+
+	err = cdebug_init();
+	if (err) {
+		unregister_capictr_notifier(&capictr_nb);
+		destroy_workqueue(kcapi_wq);
+		return err;
+	}
+
+	kcapi_proc_init();
+	return 0;
+}
+
+static void __exit kcapi_exit(void)
+{
+	kcapi_proc_exit();
+
+	unregister_capictr_notifier(&capictr_nb);
+	cdebug_exit();
+	destroy_workqueue(kcapi_wq);
+}
+
+module_init(kcapi_init);
+module_exit(kcapi_exit);