diff --git a/Documentation/devices.txt b/Documentation/devices.txt
index e6244cd..05c8064 100644
--- a/Documentation/devices.txt
+++ b/Documentation/devices.txt
@@ -2560,9 +2560,6 @@
 		 96 = /dev/usb/hiddev0	1st USB HID device
 		    ...
 		111 = /dev/usb/hiddev15	16th USB HID device
-		112 = /dev/usb/auer0	1st auerswald ISDN device
-		    ...
-		127 = /dev/usb/auer15	16th auerswald ISDN device
 		128 = /dev/usb/brlvgr0	First Braille Voyager device
 		    ...
 		131 = /dev/usb/brlvgr3	Fourth Braille Voyager device
diff --git a/Documentation/ioctl-number.txt b/Documentation/ioctl-number.txt
index 3bb5f46..1c6b545 100644
--- a/Documentation/ioctl-number.txt
+++ b/Documentation/ioctl-number.txt
@@ -105,7 +105,6 @@
 'T'	all	linux/soundcard.h	conflict!
 'T'	all	asm-i386/ioctls.h	conflict!
 'U'	00-EF	linux/drivers/usb/usb.h
-'U'	F0-FF	drivers/usb/auerswald.c
 'V'	all	linux/vt.h
 'W'	00-1F	linux/watchdog.h	conflict!
 'W'	00-1F	linux/wanrouter.h	conflict!
diff --git a/Documentation/usb/auerswald.txt b/Documentation/usb/auerswald.txt
deleted file mode 100644
index 7ee4d8f..0000000
--- a/Documentation/usb/auerswald.txt
+++ /dev/null
@@ -1,30 +0,0 @@
-		Auerswald USB kernel driver
-		===========================
-
-What is it? What can I do with it?
-==================================
-The auerswald USB kernel driver connects your linux 2.4.x
-system to the auerswald usb-enabled devices.
-
-There are two types of auerswald usb devices:
-a) small PBX systems (ISDN)
-b) COMfort system telephones (ISDN)
-
-The driver installation creates the devices
-/dev/usb/auer0..15. These devices carry a vendor-
-specific protocol. You may run all auerswald java
-software on it. The java software needs a native
-library "libAuerUsbJNINative.so" installed on
-your system. This library is available from
-auerswald and shipped as part of the java software.
-
-You may create the devices with:
-	mknod -m 666 /dev/usb/auer0 c 180 112
-	...
-	mknod -m 666 /dev/usb/auer15 c 180 127
-
-Future plans
-============
-- Connection to ISDN4LINUX (the hisax interface)
-
-The maintainer of this driver is wolfgang@iksw-muees.de
diff --git a/MAINTAINERS b/MAINTAINERS
index af6aa4e..0c42dc2 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4195,12 +4195,6 @@
 L:	linux-usb@vger.kernel.org
 S:	Maintained
 
-USB AUERSWALD DRIVER
-P:	Wolfgang Muees
-M:	wolfgang@iksw-muees.de
-L:      linux-usb@vger.kernel.org
-S:	Maintained
-
 USB BLOCK DRIVER (UB ub)
 P:	Pete Zaitcev
 M:	zaitcev@redhat.com
diff --git a/drivers/usb/misc/Kconfig b/drivers/usb/misc/Kconfig
index 001789c..4ea50e0 100644
--- a/drivers/usb/misc/Kconfig
+++ b/drivers/usb/misc/Kconfig
@@ -42,16 +42,6 @@
 	  To compile this driver as a module, choose M here.  The module
 	  will be called adutux.
 
-config USB_AUERSWALD
-	tristate "USB Auerswald ISDN support"
-	depends on USB
-	help
-	  Say Y here if you want to connect an Auerswald USB ISDN Device
-	  to your computer's USB port.
-
-	  To compile this driver as a module, choose M here: the
-	  module will be called auerswald.
-
 config USB_RIO500
 	tristate "USB Diamond Rio500 support"
 	depends on USB
diff --git a/drivers/usb/misc/Makefile b/drivers/usb/misc/Makefile
index aba091c..45b4e12 100644
--- a/drivers/usb/misc/Makefile
+++ b/drivers/usb/misc/Makefile
@@ -5,7 +5,6 @@
 
 obj-$(CONFIG_USB_ADUTUX)	+= adutux.o
 obj-$(CONFIG_USB_APPLEDISPLAY)	+= appledisplay.o
-obj-$(CONFIG_USB_AUERSWALD)	+= auerswald.o
 obj-$(CONFIG_USB_BERRY_CHARGE)	+= berry_charge.o
 obj-$(CONFIG_USB_CYPRESS_CY7C63)+= cypress_cy7c63.o
 obj-$(CONFIG_USB_CYTHERM)	+= cytherm.o
diff --git a/drivers/usb/misc/auerswald.c b/drivers/usb/misc/auerswald.c
deleted file mode 100644
index d2f61d5..0000000
--- a/drivers/usb/misc/auerswald.c
+++ /dev/null
@@ -1,2152 +0,0 @@
-/*****************************************************************************/
-/*
- *      auerswald.c  --  Auerswald PBX/System Telephone usb driver.
- *
- *      Copyright (C) 2001  Wolfgang Mües (wolfgang@iksw-muees.de)
- *
- *      Very much code of this driver is borrowed from dabusb.c (Deti Fliegl)
- *      and from the USB Skeleton driver (Greg Kroah-Hartman). Thank you.
- *
- *      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.
- *
- *      This program is distributed in the hope that it will be useful,
- *      but WITHOUT ANY WARRANTY; without even the implied warranty of
- *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *      GNU General Public License for more details.
- *
- *      You should have received a copy of the GNU General Public License
- *      along with this program; if not, write to the Free Software
- *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
- /*****************************************************************************/
-
-/* Standard Linux module include files */
-#include <asm/uaccess.h>
-#include <asm/byteorder.h>
-#include <linux/slab.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/wait.h>
-#include <linux/usb.h>
-#include <linux/mutex.h>
-
-/*-------------------------------------------------------------------*/
-/* Debug support 						     */
-#ifdef DEBUG
-#define dump( adr, len) \
-do {			\
-	unsigned int u;	\
-	printk (KERN_DEBUG); \
-	for (u = 0; u < len; u++) \
-		printk (" %02X", adr[u] & 0xFF); \
-	printk ("\n"); \
-} while (0)
-#else
-#define dump( adr, len)
-#endif
-
-/*-------------------------------------------------------------------*/
-/* Version Information */
-#define DRIVER_VERSION "0.9.11"
-#define DRIVER_AUTHOR  "Wolfgang Mües <wolfgang@iksw-muees.de>"
-#define DRIVER_DESC    "Auerswald PBX/System Telephone usb driver"
-
-/*-------------------------------------------------------------------*/
-/* Private declarations for Auerswald USB driver                     */
-
-/* Auerswald Vendor ID */
-#define ID_AUERSWALD  	0x09BF
-
-#define AUER_MINOR_BASE	112	/* auerswald driver minor number */
-
-/* we can have up to this number of device plugged in at once */
-#define AUER_MAX_DEVICES 16
-
-
-/* Number of read buffers for each device */
-#define AU_RBUFFERS     10
-
-/* Number of chain elements for each control chain */
-#define AUCH_ELEMENTS   20
-
-/* Number of retries in communication */
-#define AU_RETRIES	10
-
-/*-------------------------------------------------------------------*/
-/* vendor specific protocol                                          */
-/* Header Byte */
-#define AUH_INDIRMASK   0x80    /* mask for direct/indirect bit */
-#define AUH_DIRECT      0x00    /* data is for USB device */
-#define AUH_INDIRECT    0x80    /* USB device is relay */
-
-#define AUH_SPLITMASK   0x40    /* mask for split bit */
-#define AUH_UNSPLIT     0x00    /* data block is full-size */
-#define AUH_SPLIT       0x40    /* data block is part of a larger one,
-                                   split-byte follows */
-
-#define AUH_TYPEMASK    0x3F    /* mask for type of data transfer */
-#define AUH_TYPESIZE    0x40    /* different types */
-#define AUH_DCHANNEL    0x00    /* D channel data */
-#define AUH_B1CHANNEL   0x01    /* B1 channel transparent */
-#define AUH_B2CHANNEL   0x02    /* B2 channel transparent */
-/*                0x03..0x0F       reserved for driver internal use */
-#define AUH_COMMAND     0x10    /* Command channel */
-#define AUH_BPROT       0x11    /* Configuration block protocol */
-#define AUH_DPROTANA    0x12    /* D channel protocol analyzer */
-#define AUH_TAPI        0x13    /* telephone api data (ATD) */
-/*                0x14..0x3F       reserved for other protocols */
-#define AUH_UNASSIGNED  0xFF    /* if char device has no assigned service */
-#define AUH_FIRSTUSERCH 0x11    /* first channel which is available for driver users */
-
-#define AUH_SIZE	1 	/* Size of Header Byte */
-
-/* Split Byte. Only present if split bit in header byte set.*/
-#define AUS_STARTMASK   0x80    /* mask for first block of splitted frame */
-#define AUS_FIRST       0x80    /* first block */
-#define AUS_FOLLOW      0x00    /* following block */
-
-#define AUS_ENDMASK     0x40    /* mask for last block of splitted frame */
-#define AUS_END         0x40    /* last block */
-#define AUS_NOEND       0x00    /* not the last block */
-
-#define AUS_LENMASK     0x3F    /* mask for block length information */
-
-/* Request types */
-#define AUT_RREQ        (USB_DIR_IN  | USB_TYPE_VENDOR | USB_RECIP_OTHER)   /* Read Request */
-#define AUT_WREQ        (USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_OTHER)   /* Write Request */
-
-/* Vendor Requests */
-#define AUV_GETINFO     0x00    /* GetDeviceInfo */
-#define AUV_WBLOCK      0x01    /* Write Block */
-#define AUV_RBLOCK      0x02    /* Read Block */
-#define AUV_CHANNELCTL  0x03    /* Channel Control */
-#define AUV_DUMMY	0x04	/* Dummy Out for retry */
-
-/* Device Info Types */
-#define AUDI_NUMBCH     0x0000  /* Number of supported B channels */
-#define AUDI_OUTFSIZE   0x0001  /* Size of OUT B channel fifos */
-#define AUDI_MBCTRANS   0x0002  /* max. Blocklength of control transfer */
-
-/* Interrupt endpoint definitions */
-#define AU_IRQENDP      1       /* Endpoint number */
-#define AU_IRQCMDID     16      /* Command-block ID */
-#define AU_BLOCKRDY     0       /* Command: Block data ready on ctl endpoint */
-#define AU_IRQMINSIZE	5	/* Nr. of bytes decoded in this driver */
-
-/* Device String Descriptors */
-#define AUSI_VENDOR   	1	/* "Auerswald GmbH & Co. KG" */
-#define AUSI_DEVICE   	2	/* Name of the Device */
-#define AUSI_SERIALNR 	3	/* Serial Number */
-#define AUSI_MSN      	4	/* "MSN ..." (first) Multiple Subscriber Number */
-
-#define AUSI_DLEN	100	/* Max. Length of Device Description */
-
-#define AUV_RETRY	0x101	/* First Firmware version which can do control retries */
-
-/*-------------------------------------------------------------------*/
-/* External data structures / Interface                              */
-typedef struct
-{
-	char __user *buf;	/* return buffer for string contents */
-	unsigned int bsize;	/* size of return buffer */
-} audevinfo_t,*paudevinfo_t;
-
-/* IO controls */
-#define IOCTL_AU_SLEN	  _IOR( 'U', 0xF0, int)         /* return the max. string descriptor length */
-#define IOCTL_AU_DEVINFO  _IOWR('U', 0xF1, audevinfo_t) /* get name of a specific device */
-#define IOCTL_AU_SERVREQ  _IOW( 'U', 0xF2, int) 	/* request a service channel */
-#define IOCTL_AU_BUFLEN	  _IOR( 'U', 0xF3, int)         /* return the max. buffer length for the device */
-#define IOCTL_AU_RXAVAIL  _IOR( 'U', 0xF4, int)         /* return != 0 if Receive Data available */
-#define IOCTL_AU_CONNECT  _IOR( 'U', 0xF5, int)         /* return != 0 if connected to a service channel */
-#define IOCTL_AU_TXREADY  _IOR( 'U', 0xF6, int)         /* return != 0 if Transmitt channel ready to send */
-/*                              'U'  0xF7..0xFF reseved */
-
-/*-------------------------------------------------------------------*/
-/* Internal data structures                                          */
-
-/* ..................................................................*/
-/* urb chain element */
-struct  auerchain;                      /* forward for circular reference */
-typedef struct
-{
-        struct auerchain *chain;        /* pointer to the chain to which this element belongs */
-        struct urb * urbp;                   /* pointer to attached urb */
-        void *context;                  /* saved URB context */
-        usb_complete_t complete;        /* saved URB completion function */
-        struct list_head list;          /* to include element into a list */
-} auerchainelement_t,*pauerchainelement_t;
-
-/* urb chain */
-typedef struct auerchain
-{
-        pauerchainelement_t active;     /* element which is submitted to urb */
-	spinlock_t lock;                /* protection agains interrupts */
-        struct list_head waiting_list;  /* list of waiting elements */
-        struct list_head free_list;     /* list of available elements */
-} auerchain_t,*pauerchain_t;
-
-/* urb blocking completion helper struct */
-typedef struct
-{
-	wait_queue_head_t wqh;    	/* wait for completion */
-	unsigned int done;		/* completion flag */
-} auerchain_chs_t,*pauerchain_chs_t;
-
-/* ...................................................................*/
-/* buffer element */
-struct  auerbufctl;                     /* forward */
-typedef struct
-{
-        char *bufp;                     /* reference to allocated data buffer */
-        unsigned int len;               /* number of characters in data buffer */
-	unsigned int retries;		/* for urb retries */
-        struct usb_ctrlrequest *dr;	/* for setup data in control messages */
-        struct urb * urbp;                   /* USB urb */
-        struct auerbufctl *list;        /* pointer to list */
-        struct list_head buff_list;     /* reference to next buffer in list */
-} auerbuf_t,*pauerbuf_t;
-
-/* buffer list control block */
-typedef struct auerbufctl
-{
-        spinlock_t lock;                /* protection in interrupt */
-        struct list_head free_buff_list;/* free buffers */
-        struct list_head rec_buff_list; /* buffers with receive data */
-} auerbufctl_t,*pauerbufctl_t;
-
-/* ...................................................................*/
-/* service context */
-struct  auerscon;                       /* forward */
-typedef void (*auer_dispatch_t)(struct auerscon*, pauerbuf_t);
-typedef void (*auer_disconn_t) (struct auerscon*);
-typedef struct auerscon
-{
-        unsigned int id;                /* protocol service id AUH_xxxx */
-        auer_dispatch_t dispatch;       /* dispatch read buffer */
-	auer_disconn_t disconnect;	/* disconnect from device, wake up all char readers */
-} auerscon_t,*pauerscon_t;
-
-/* ...................................................................*/
-/* USB device context */
-typedef struct
-{
-	struct mutex 	mutex;         	    /* protection in user context */
-	char 			name[20];	    /* name of the /dev/usb entry */
-	unsigned int		dtindex;	    /* index in the device table */
-	struct usb_device *	usbdev;      	    /* USB device handle */
-	int			open_count;	    /* count the number of open character channels */
-        char 			dev_desc[AUSI_DLEN];/* for storing a textual description */
-        unsigned int 		maxControlLength;   /* max. Length of control paket (without header) */
-        struct urb * 		inturbp;            /* interrupt urb */
-        char *			intbufp;            /* data buffer for interrupt urb */
-	unsigned int 		irqsize;	    /* size of interrupt endpoint 1 */
-        struct auerchain 	controlchain;  	    /* for chaining of control messages */
-	auerbufctl_t 		bufctl;             /* Buffer control for control transfers */
-        pauerscon_t 	     	services[AUH_TYPESIZE];/* context pointers for each service */
-	unsigned int		version;	    /* Version of the device */
-	wait_queue_head_t 	bufferwait;         /* wait for a control buffer */
-} auerswald_t,*pauerswald_t;
-
-/* ................................................................... */
-/* character device context */
-typedef struct
-{
-	struct mutex mutex;		/* protection in user context */
-	pauerswald_t auerdev;           /* context pointer of assigned device */
-        auerbufctl_t bufctl;            /* controls the buffer chain */
-        auerscon_t scontext;            /* service context */
-	wait_queue_head_t readwait;     /* for synchronous reading */
-	struct mutex readmutex;		/* protection against multiple reads */
-	pauerbuf_t readbuf;		/* buffer held for partial reading */
-	unsigned int readoffset;	/* current offset in readbuf */
-	unsigned int removed;		/* is != 0 if device is removed */
-} auerchar_t,*pauerchar_t;
-
-
-/*-------------------------------------------------------------------*/
-/* Forwards */
-static void auerswald_ctrlread_complete (struct urb * urb);
-static void auerswald_removeservice (pauerswald_t cp, pauerscon_t scp);
-static struct usb_driver auerswald_driver;
-
-
-/*-------------------------------------------------------------------*/
-/* USB chain helper functions                                        */
-/* --------------------------                                        */
-
-/* completion function for chained urbs */
-static void auerchain_complete (struct urb * urb)
-{
-	unsigned long flags;
-        int result;
-
-        /* get pointer to element and to chain */
-	pauerchainelement_t acep = urb->context;
-        pauerchain_t         acp = acep->chain;
-
-        /* restore original entries in urb */
-        urb->context  = acep->context;
-        urb->complete = acep->complete;
-
-        dbg ("auerchain_complete called");
-
-        /* call original completion function
-           NOTE: this function may lead to more urbs submitted into the chain.
-                 (no chain lock at calling complete()!)
-                 acp->active != NULL is protecting us against recursion.*/
-        urb->complete (urb);
-
-        /* detach element from chain data structure */
-	spin_lock_irqsave (&acp->lock, flags);
-        if (acp->active != acep) /* paranoia debug check */
-	        dbg ("auerchain_complete: completion on non-active element called!");
-        else
-                acp->active = NULL;
-
-        /* add the used chain element to the list of free elements */
-	list_add_tail (&acep->list, &acp->free_list);
-        acep = NULL;
-
-        /* is there a new element waiting in the chain? */
-        if (!acp->active && !list_empty (&acp->waiting_list)) {
-                /* yes: get the entry */
-                struct list_head *tmp = acp->waiting_list.next;
-                list_del (tmp);
-                acep = list_entry (tmp, auerchainelement_t, list);
-                acp->active = acep;
-        }
-        spin_unlock_irqrestore (&acp->lock, flags);
-
-        /* submit the new urb */
-        if (acep) {
-                urb    = acep->urbp;
-                dbg ("auerchain_complete: submitting next urb from chain");
-		urb->status = 0;	/* needed! */
-		result = usb_submit_urb(urb, GFP_ATOMIC);
-
-                /* check for submit errors */
-                if (result) {
-                        urb->status = result;
-                        dbg("auerchain_complete: usb_submit_urb with error code %d", result);
-                        /* and do error handling via *this* completion function (recursive) */
-                        auerchain_complete( urb);
-                }
-        } else {
-                /* simple return without submitting a new urb.
-                   The empty chain is detected with acp->active == NULL. */
-        };
-}
-
-
-/* submit function for chained urbs
-   this function may be called from completion context or from user space!
-   early = 1 -> submit in front of chain
-*/
-static int auerchain_submit_urb_list (pauerchain_t acp, struct urb * urb, int early)
-{
-        int result;
-        unsigned long flags;
-        pauerchainelement_t acep = NULL;
-
-        dbg ("auerchain_submit_urb called");
-
-        /* try to get a chain element */
-        spin_lock_irqsave (&acp->lock, flags);
-        if (!list_empty (&acp->free_list)) {
-                /* yes: get the entry */
-                struct list_head *tmp = acp->free_list.next;
-                list_del (tmp);
-                acep = list_entry (tmp, auerchainelement_t, list);
-        }
-        spin_unlock_irqrestore (&acp->lock, flags);
-
-        /* if no chain element available: return with error */
-        if (!acep) {
-                return -ENOMEM;
-        }
-
-        /* fill in the new chain element values */
-        acep->chain    = acp;
-        acep->context  = urb->context;
-        acep->complete = urb->complete;
-        acep->urbp     = urb;
-        INIT_LIST_HEAD (&acep->list);
-
-        /* modify urb */
-        urb->context   = acep;
-        urb->complete  = auerchain_complete;
-        urb->status    = -EINPROGRESS;    /* usb_submit_urb does this, too */
-
-        /* add element to chain - or start it immediately */
-        spin_lock_irqsave (&acp->lock, flags);
-        if (acp->active) {
-                /* there is traffic in the chain, simple add element to chain */
-		if (early) {
-			dbg ("adding new urb to head of chain");
-			list_add (&acep->list, &acp->waiting_list);
-		} else {
-			dbg ("adding new urb to end of chain");
-			list_add_tail (&acep->list, &acp->waiting_list);
-		}
-		acep = NULL;
-        } else {
-                /* the chain is empty. Prepare restart */
-                acp->active = acep;
-        }
-        /* Spin has to be removed before usb_submit_urb! */
-        spin_unlock_irqrestore (&acp->lock, flags);
-
-        /* Submit urb if immediate restart */
-        if (acep) {
-                dbg("submitting urb immediate");
-		urb->status = 0;	/* needed! */
-                result = usb_submit_urb(urb, GFP_ATOMIC);
-                /* check for submit errors */
-                if (result) {
-                        urb->status = result;
-                        dbg("auerchain_submit_urb: usb_submit_urb with error code %d", result);
-                        /* and do error handling via completion function */
-                        auerchain_complete( urb);
-                }
-        }
-
-        return 0;
-}
-
-/* submit function for chained urbs
-   this function may be called from completion context or from user space!
-*/
-static int auerchain_submit_urb (pauerchain_t acp, struct urb * urb)
-{
-	return auerchain_submit_urb_list (acp, urb, 0);
-}
-
-/* cancel an urb which is submitted to the chain
-   the result is 0 if the urb is cancelled, or -EINPROGRESS if
-   the function is successfully started.
-*/
-static int auerchain_unlink_urb (pauerchain_t acp, struct urb * urb)
-{
-	unsigned long flags;
-        struct urb * urbp;
-        pauerchainelement_t acep;
-        struct list_head *tmp;
-
-        dbg ("auerchain_unlink_urb called");
-
-        /* search the chain of waiting elements */
-        spin_lock_irqsave (&acp->lock, flags);
-        list_for_each (tmp, &acp->waiting_list) {
-                acep = list_entry (tmp, auerchainelement_t, list);
-                if (acep->urbp == urb) {
-                        list_del (tmp);
-                        urb->context = acep->context;
-                        urb->complete = acep->complete;
-                        list_add_tail (&acep->list, &acp->free_list);
-                        spin_unlock_irqrestore (&acp->lock, flags);
-                        dbg ("unlink waiting urb");
-                        urb->status = -ENOENT;
-                        urb->complete (urb);
-                        return 0;
-                }
-        }
-        /* not found. */
-        spin_unlock_irqrestore (&acp->lock, flags);
-
-        /* get the active urb */
-        acep = acp->active;
-        if (acep) {
-                urbp = acep->urbp;
-
-                /* check if we have to cancel the active urb */
-                if (urbp == urb) {
-                        /* note that there is a race condition between the check above
-                           and the unlink() call because of no lock. This race is harmless,
-                           because the usb module will detect the unlink() after completion.
-                           We can't use the acp->lock here because the completion function
-                           wants to grab it.
-			*/
-                        dbg ("unlink active urb");
-                        return usb_unlink_urb (urbp);
-                }
-        }
-
-        /* not found anyway
-           ... is some kind of success
-	*/
-        dbg ("urb to unlink not found in chain");
-        return 0;
-}
-
-/* cancel all urbs which are in the chain.
-   this function must not be called from interrupt or completion handler.
-*/
-static void auerchain_unlink_all (pauerchain_t acp)
-{
-	unsigned long flags;
-        struct urb * urbp;
-        pauerchainelement_t acep;
-
-        dbg ("auerchain_unlink_all called");
-
-        /* clear the chain of waiting elements */
-        spin_lock_irqsave (&acp->lock, flags);
-        while (!list_empty (&acp->waiting_list)) {
-                /* get the next entry */
-                struct list_head *tmp = acp->waiting_list.next;
-                list_del (tmp);
-                acep = list_entry (tmp, auerchainelement_t, list);
-                urbp = acep->urbp;
-                urbp->context = acep->context;
-                urbp->complete = acep->complete;
-                list_add_tail (&acep->list, &acp->free_list);
-                spin_unlock_irqrestore (&acp->lock, flags);
-                dbg ("unlink waiting urb");
-                urbp->status = -ENOENT;
-                urbp->complete (urbp);
-                spin_lock_irqsave (&acp->lock, flags);
-        }
-        spin_unlock_irqrestore (&acp->lock, flags);
-
-        /* clear the active urb */
-        acep = acp->active;
-        if (acep) {
-                urbp = acep->urbp;
-                dbg ("unlink active urb");
-                usb_kill_urb (urbp);
-        }
-}
-
-
-/* free the chain.
-   this function must not be called from interrupt or completion handler.
-*/
-static void auerchain_free (pauerchain_t acp)
-{
-	unsigned long flags;
-        pauerchainelement_t acep;
-
-        dbg ("auerchain_free called");
-
-        /* first, cancel all pending urbs */
-        auerchain_unlink_all (acp);
-
-        /* free the elements */
-        spin_lock_irqsave (&acp->lock, flags);
-        while (!list_empty (&acp->free_list)) {
-                /* get the next entry */
-                struct list_head *tmp = acp->free_list.next;
-                list_del (tmp);
-                spin_unlock_irqrestore (&acp->lock, flags);
-		acep = list_entry (tmp, auerchainelement_t, list);
-                kfree (acep);
-	        spin_lock_irqsave (&acp->lock, flags);
-	}
-        spin_unlock_irqrestore (&acp->lock, flags);
-}
-
-
-/* Init the chain control structure */
-static void auerchain_init (pauerchain_t acp)
-{
-        /* init the chain data structure */
-        acp->active = NULL;
-	spin_lock_init (&acp->lock);
-        INIT_LIST_HEAD (&acp->waiting_list);
-        INIT_LIST_HEAD (&acp->free_list);
-}
-
-/* setup a chain.
-   It is assumed that there is no concurrency while setting up the chain
-   requirement: auerchain_init()
-*/
-static int auerchain_setup (pauerchain_t acp, unsigned int numElements)
-{
-        pauerchainelement_t acep;
-
-        dbg ("auerchain_setup called with %d elements", numElements);
-
-        /* fill the list of free elements */
-        for (;numElements; numElements--) {
-                acep = kzalloc(sizeof(auerchainelement_t), GFP_KERNEL);
-                if (!acep)
-			goto ac_fail;
-                INIT_LIST_HEAD (&acep->list);
-                list_add_tail (&acep->list, &acp->free_list);
-        }
-        return 0;
-
-ac_fail:/* free the elements */
-        while (!list_empty (&acp->free_list)) {
-                /* get the next entry */
-                struct list_head *tmp = acp->free_list.next;
-                list_del (tmp);
-                acep = list_entry (tmp, auerchainelement_t, list);
-                kfree (acep);
-        }
-        return -ENOMEM;
-}
-
-
-/* completion handler for synchronous chained URBs */
-static void auerchain_blocking_completion (struct urb *urb)
-{
-	pauerchain_chs_t pchs = urb->context;
-	pchs->done = 1;
-	wmb();
-	wake_up (&pchs->wqh);
-}
-
-
-/* Starts chained urb and waits for completion or timeout */
-static int auerchain_start_wait_urb (pauerchain_t acp, struct urb *urb, int timeout, int* actual_length)
-{
-	auerchain_chs_t chs;
-	int status;
-
-	dbg ("auerchain_start_wait_urb called");
-	init_waitqueue_head (&chs.wqh);
-	chs.done = 0;
-
-	urb->context = &chs;
-	status = auerchain_submit_urb (acp, urb);
-	if (status)
-		/* something went wrong */
-		return status;
-
-	timeout = wait_event_timeout(chs.wqh, chs.done, timeout);
-
-	if (!timeout && !chs.done) {
-		if (urb->status != -EINPROGRESS) {	/* No callback?!! */
-			dbg ("auerchain_start_wait_urb: raced timeout");
-			status = urb->status;
-		} else {
-			dbg ("auerchain_start_wait_urb: timeout");
-			auerchain_unlink_urb (acp, urb);  /* remove urb safely */
-			status = -ETIMEDOUT;
-		}
-	} else
-		status = urb->status;
-
-	if (status >= 0)
-		*actual_length = urb->actual_length;
-
-  	return status;
-}
-
-
-/* auerchain_control_msg - Builds a control urb, sends it off and waits for completion
-   acp: pointer to the auerchain
-   dev: pointer to the usb device to send the message to
-   pipe: endpoint "pipe" to send the message to
-   request: USB message request value
-   requesttype: USB message request type value
-   value: USB message value
-   index: USB message index value
-   data: pointer to the data to send
-   size: length in bytes of the data to send
-   timeout: time to wait for the message to complete before timing out (if 0 the wait is forever)
-
-   This function sends a simple control message to a specified endpoint
-   and waits for the message to complete, or timeout.
-
-   If successful, it returns the transferred length, otherwise a negative error number.
-
-   Don't use this function from within an interrupt context, like a
-   bottom half handler.  If you need an asynchronous message, or need to send
-   a message from within interrupt context, use auerchain_submit_urb()
-*/
-static int auerchain_control_msg (pauerchain_t acp, struct usb_device *dev, unsigned int pipe, __u8 request, __u8 requesttype,
-			          __u16 value, __u16 index, void *data, __u16 size, int timeout)
-{
-	int ret;
-	struct usb_ctrlrequest *dr;
-	struct urb *urb;
-        int uninitialized_var(length);
-
-        dbg ("auerchain_control_msg");
-        dr = kmalloc (sizeof (struct usb_ctrlrequest), GFP_KERNEL);
-	if (!dr)
-		return -ENOMEM;
-	urb = usb_alloc_urb (0, GFP_KERNEL);
-	if (!urb) {
-        	kfree (dr);
-		return -ENOMEM;
-        }
-
-	dr->bRequestType = requesttype;
-	dr->bRequest = request;
-	dr->wValue  = cpu_to_le16 (value);
-	dr->wIndex  = cpu_to_le16 (index);
-	dr->wLength = cpu_to_le16 (size);
-
-	usb_fill_control_urb (urb, dev, pipe, (unsigned char*)dr, data, size,    /* build urb */
-		          auerchain_blocking_completion, NULL);
-	ret = auerchain_start_wait_urb (acp, urb, timeout, &length);
-
-	usb_free_urb (urb);
-	kfree (dr);
-
-        if (ret < 0)
-		return ret;
-	else
-		return length;
-}
-
-
-/*-------------------------------------------------------------------*/
-/* Buffer List helper functions                                      */
-
-/* free a single auerbuf */
-static void auerbuf_free (pauerbuf_t bp)
-{
-	kfree(bp->bufp);
-	kfree(bp->dr);
-	usb_free_urb(bp->urbp);
-	kfree(bp);
-}
-
-/* free the buffers from an auerbuf list */
-static void auerbuf_free_list (struct list_head *q)
-{
-        struct list_head *tmp;
-	struct list_head *p;
-	pauerbuf_t bp;
-
-	dbg ("auerbuf_free_list");
-	for (p = q->next; p != q;) {
-		bp = list_entry (p, auerbuf_t, buff_list);
-		tmp = p->next;
-		list_del (p);
-		p = tmp;
-		auerbuf_free (bp);
-	}
-}
-
-/* init the members of a list control block */
-static void auerbuf_init (pauerbufctl_t bcp)
-{
-	dbg ("auerbuf_init");
-	spin_lock_init (&bcp->lock);
-        INIT_LIST_HEAD (&bcp->free_buff_list);
-        INIT_LIST_HEAD (&bcp->rec_buff_list);
-}
-
-/* free all buffers from an auerbuf chain */
-static void auerbuf_free_buffers (pauerbufctl_t bcp)
-{
-	unsigned long flags;
-	dbg ("auerbuf_free_buffers");
-
-        spin_lock_irqsave (&bcp->lock, flags);
-
-	auerbuf_free_list (&bcp->free_buff_list);
-	auerbuf_free_list (&bcp->rec_buff_list);
-
-        spin_unlock_irqrestore (&bcp->lock, flags);
-}
-
-/* setup a list of buffers */
-/* requirement: auerbuf_init() */
-static int auerbuf_setup (pauerbufctl_t bcp, unsigned int numElements, unsigned int bufsize)
-{
-        pauerbuf_t bep = NULL;
-
-        dbg ("auerbuf_setup called with %d elements of %d bytes", numElements, bufsize);
-
-        /* fill the list of free elements */
-        for (;numElements; numElements--) {
-                bep = kzalloc(sizeof(auerbuf_t), GFP_KERNEL);
-                if (!bep)
-			goto bl_fail;
-                bep->list = bcp;
-                INIT_LIST_HEAD (&bep->buff_list);
-                bep->bufp = kmalloc (bufsize, GFP_KERNEL);
-                if (!bep->bufp)
-			goto bl_fail;
-                bep->dr = kmalloc(sizeof (struct usb_ctrlrequest), GFP_KERNEL);
-                if (!bep->dr)
-			goto bl_fail;
-                bep->urbp = usb_alloc_urb (0, GFP_KERNEL);
-                if (!bep->urbp)
-			goto bl_fail;
-                list_add_tail (&bep->buff_list, &bcp->free_buff_list);
-        }
-        return 0;
-
-bl_fail:/* not enough memory. Free allocated elements */
-        dbg ("auerbuf_setup: no more memory");
-	auerbuf_free(bep);
-        auerbuf_free_buffers (bcp);
-        return -ENOMEM;
-}
-
-/* insert a used buffer into the free list */
-static void auerbuf_releasebuf( pauerbuf_t bp)
-{
-        unsigned long flags;
-        pauerbufctl_t bcp = bp->list;
-	bp->retries = 0;
-
-        dbg ("auerbuf_releasebuf called");
-        spin_lock_irqsave (&bcp->lock, flags);
-	list_add_tail (&bp->buff_list, &bcp->free_buff_list);
-        spin_unlock_irqrestore (&bcp->lock, flags);
-}
-
-
-/*-------------------------------------------------------------------*/
-/* Completion handlers */
-
-/* Values of urb->status or results of usb_submit_urb():
-0		Initial, OK
--EINPROGRESS	during submission until end
--ENOENT		if urb is unlinked
--ETIME		Device did not respond
--ENOMEM		Memory Overflow
--ENODEV		Specified USB-device or bus doesn't exist
--ENXIO		URB already queued
--EINVAL		a) Invalid transfer type specified (or not supported)
-		b) Invalid interrupt interval (0n256)
--EAGAIN		a) Specified ISO start frame too early
-		b) (using ISO-ASAP) Too much scheduled for the future wait some time and try again.
--EFBIG		Too much ISO frames requested (currently uhci900)
--EPIPE		Specified pipe-handle/Endpoint is already stalled
--EMSGSIZE	Endpoint message size is zero, do interface/alternate setting
--EPROTO		a) Bitstuff error
-		b) Unknown USB error
--EILSEQ		CRC mismatch
--ENOSR		Buffer error
--EREMOTEIO	Short packet detected
--EXDEV		ISO transfer only partially completed look at individual frame status for details
--EINVAL		ISO madness, if this happens: Log off and go home
--EOVERFLOW	babble
-*/
-
-/* check if a status code allows a retry */
-static int auerswald_status_retry (int status)
-{
-	switch (status) {
-	case 0:
-	case -ETIME:
-	case -EOVERFLOW:
-	case -EAGAIN:
-	case -EPIPE:
-	case -EPROTO:
-	case -EILSEQ:
-	case -ENOSR:
-	case -EREMOTEIO:
-		return 1; /* do a retry */
-	}
-	return 0;	/* no retry possible */
-}
-
-/* Completion of asynchronous write block */
-static void auerchar_ctrlwrite_complete (struct urb * urb)
-{
-	pauerbuf_t bp =  urb->context;
-	pauerswald_t cp = ((pauerswald_t)((char *)(bp->list)-(unsigned long)(&((pauerswald_t)0)->bufctl)));
-	dbg ("auerchar_ctrlwrite_complete called");
-
-	/* reuse the buffer */
-	auerbuf_releasebuf (bp);
-	/* Wake up all processes waiting for a buffer */
-	wake_up (&cp->bufferwait);
-}
-
-/* Completion handler for dummy retry packet */
-static void auerswald_ctrlread_wretcomplete (struct urb * urb)
-{
-	pauerbuf_t bp = urb->context;
-        pauerswald_t cp;
-	int ret;
-	int status = urb->status;
-
-        dbg ("auerswald_ctrlread_wretcomplete called");
-        dbg ("complete with status: %d", status);
-	cp = ((pauerswald_t)((char *)(bp->list)-(unsigned long)(&((pauerswald_t)0)->bufctl)));
-
-	/* check if it is possible to advance */
-	if (!auerswald_status_retry(status) || !cp->usbdev) {
-		/* reuse the buffer */
-		err ("control dummy: transmission error %d, can not retry", status);
-		auerbuf_releasebuf (bp);
-		/* Wake up all processes waiting for a buffer */
-		wake_up (&cp->bufferwait);
-		return;
-	}
-
-	/* fill the control message */
-	bp->dr->bRequestType = AUT_RREQ;
-	bp->dr->bRequest     = AUV_RBLOCK;
-	bp->dr->wLength      = bp->dr->wValue;	/* temporary stored */
-	bp->dr->wValue       = cpu_to_le16 (1);	/* Retry Flag */
-	/* bp->dr->index    = channel id;          remains */
-	usb_fill_control_urb (bp->urbp, cp->usbdev, usb_rcvctrlpipe (cp->usbdev, 0),
-                          (unsigned char*)bp->dr, bp->bufp, le16_to_cpu (bp->dr->wLength),
-		          auerswald_ctrlread_complete,bp);
-
-	/* submit the control msg as next paket */
-	ret = auerchain_submit_urb_list (&cp->controlchain, bp->urbp, 1);
-        if (ret) {
-        	dbg ("auerswald_ctrlread_complete: nonzero result of auerchain_submit_urb_list %d", ret);
-        	bp->urbp->status = ret;
-        	auerswald_ctrlread_complete (bp->urbp);
-    	}
-}
-
-/* completion handler for receiving of control messages */
-static void auerswald_ctrlread_complete (struct urb * urb)
-{
-        unsigned int  serviceid;
-        pauerswald_t  cp;
-        pauerscon_t   scp;
-	pauerbuf_t bp = urb->context;
-	int status = urb->status;
-	int ret;
-
-        dbg ("auerswald_ctrlread_complete called");
-
-	cp = ((pauerswald_t)((char *)(bp->list)-(unsigned long)(&((pauerswald_t)0)->bufctl)));
-
-	/* check if there is valid data in this urb */
-        if (status) {
-		dbg ("complete with non-zero status: %d", status);
-		/* should we do a retry? */
-		if (!auerswald_status_retry(status)
-		 || !cp->usbdev
-		 || (cp->version < AUV_RETRY)
-                 || (bp->retries >= AU_RETRIES)) {
-			/* reuse the buffer */
-			err ("control read: transmission error %d, can not retry", status);
-			auerbuf_releasebuf (bp);
-			/* Wake up all processes waiting for a buffer */
-			wake_up (&cp->bufferwait);
-			return;
-		}
-		bp->retries++;
-		dbg ("Retry count = %d", bp->retries);
-		/* send a long dummy control-write-message to allow device firmware to react */
-		bp->dr->bRequestType = AUT_WREQ;
-		bp->dr->bRequest     = AUV_DUMMY;
-		bp->dr->wValue       = bp->dr->wLength; /* temporary storage */
-		// bp->dr->wIndex    channel ID remains
-		bp->dr->wLength      = cpu_to_le16 (32); /* >= 8 bytes */
-		usb_fill_control_urb (bp->urbp, cp->usbdev, usb_sndctrlpipe (cp->usbdev, 0),
-  			(unsigned char*)bp->dr, bp->bufp, 32,
-	   		auerswald_ctrlread_wretcomplete,bp);
-
-		/* submit the control msg as next paket */
-       		ret = auerchain_submit_urb_list (&cp->controlchain, bp->urbp, 1);
-       		if (ret) {
-               		dbg ("auerswald_ctrlread_complete: nonzero result of auerchain_submit_urb_list %d", ret);
-               		bp->urbp->status = ret;
-               		auerswald_ctrlread_wretcomplete (bp->urbp);
-		}
-                return;
-        }
-
-        /* get the actual bytecount (incl. headerbyte) */
-        bp->len = urb->actual_length;
-        serviceid = bp->bufp[0] & AUH_TYPEMASK;
-        dbg ("Paket with serviceid %d and %d bytes received", serviceid, bp->len);
-
-        /* dispatch the paket */
-        scp = cp->services[serviceid];
-        if (scp) {
-                /* look, Ma, a listener! */
-                scp->dispatch (scp, bp);
-        }
-
-        /* release the paket */
-        auerbuf_releasebuf (bp);
-	/* Wake up all processes waiting for a buffer */
-	wake_up (&cp->bufferwait);
-}
-
-/*-------------------------------------------------------------------*/
-/* Handling of Interrupt Endpoint                                    */
-/* This interrupt Endpoint is used to inform the host about waiting
-   messages from the USB device.
-*/
-/* int completion handler. */
-static void auerswald_int_complete (struct urb * urb)
-{
-        unsigned long flags;
-        unsigned  int channelid;
-        unsigned  int bytecount;
-        int ret;
-	int status = urb->status;
-        pauerbuf_t   bp = NULL;
-	pauerswald_t cp = urb->context;
-
-        dbg ("%s called", __func__);
-
-	switch (status) {
-	case 0:
-		/* success */
-		break;
-	case -ECONNRESET:
-	case -ENOENT:
-	case -ESHUTDOWN:
-		/* this urb is terminated, clean up */
-		dbg("%s - urb shutting down with status: %d", __func__, status);
-		return;
-	default:
-		dbg("%s - nonzero urb status received: %d", __func__, status);
-		goto exit;
-	}
-
-        /* check if all needed data was received */
-	if (urb->actual_length < AU_IRQMINSIZE) {
-                dbg ("invalid data length received: %d bytes", urb->actual_length);
-		goto exit;
-        }
-
-        /* check the command code */
-        if (cp->intbufp[0] != AU_IRQCMDID) {
-                dbg ("invalid command received: %d", cp->intbufp[0]);
-		goto exit;
-        }
-
-        /* check the command type */
-        if (cp->intbufp[1] != AU_BLOCKRDY) {
-                dbg ("invalid command type received: %d", cp->intbufp[1]);
-		goto exit;
-        }
-
-        /* now extract the information */
-        channelid = cp->intbufp[2];
-        bytecount = (unsigned char)cp->intbufp[3];
-        bytecount |= (unsigned char)cp->intbufp[4] << 8;
-
-        /* check the channel id */
-        if (channelid >= AUH_TYPESIZE) {
-                dbg ("invalid channel id received: %d", channelid);
-		goto exit;
-        }
-
-        /* check the byte count */
-        if (bytecount > (cp->maxControlLength+AUH_SIZE)) {
-                dbg ("invalid byte count received: %d", bytecount);
-		goto exit;
-        }
-        dbg ("Service Channel = %d", channelid);
-        dbg ("Byte Count = %d", bytecount);
-
-        /* get a buffer for the next data paket */
-        spin_lock_irqsave (&cp->bufctl.lock, flags);
-        if (!list_empty (&cp->bufctl.free_buff_list)) {
-                /* yes: get the entry */
-                struct list_head *tmp = cp->bufctl.free_buff_list.next;
-                list_del (tmp);
-                bp = list_entry (tmp, auerbuf_t, buff_list);
-        }
-        spin_unlock_irqrestore (&cp->bufctl.lock, flags);
-
-        /* if no buffer available: skip it */
-        if (!bp) {
-                dbg ("auerswald_int_complete: no data buffer available");
-                /* can we do something more?
-		   This is a big problem: if this int packet is ignored, the
-		   device will wait forever and not signal any more data.
-		   The only real solution is: having enough buffers!
-		   Or perhaps temporary disabling the int endpoint?
-		*/
-		goto exit;
-        }
-
-	/* fill the control message */
-        bp->dr->bRequestType = AUT_RREQ;
-	bp->dr->bRequest     = AUV_RBLOCK;
-	bp->dr->wValue       = cpu_to_le16 (0);
-	bp->dr->wIndex       = cpu_to_le16 (channelid | AUH_DIRECT | AUH_UNSPLIT);
-	bp->dr->wLength      = cpu_to_le16 (bytecount);
-	usb_fill_control_urb (bp->urbp, cp->usbdev, usb_rcvctrlpipe (cp->usbdev, 0),
-                          (unsigned char*)bp->dr, bp->bufp, bytecount,
-		          auerswald_ctrlread_complete,bp);
-
-        /* submit the control msg */
-        ret = auerchain_submit_urb (&cp->controlchain, bp->urbp);
-        if (ret) {
-                dbg ("auerswald_int_complete: nonzero result of auerchain_submit_urb %d", ret);
-                bp->urbp->status = ret;
-                auerswald_ctrlread_complete( bp->urbp);
-		/* here applies the same problem as above: device locking! */
-        }
-exit:
-	ret = usb_submit_urb (urb, GFP_ATOMIC);
-	if (ret)
-		err ("%s - usb_submit_urb failed with result %d",
-		     __func__, ret);
-}
-
-/* int memory deallocation
-   NOTE: no mutex please!
-*/
-static void auerswald_int_free (pauerswald_t cp)
-{
-	if (cp->inturbp) {
-		usb_free_urb(cp->inturbp);
-		cp->inturbp = NULL;
-	}
-	kfree(cp->intbufp);
-	cp->intbufp = NULL;
-}
-
-/* This function is called to activate the interrupt
-   endpoint. This function returns 0 if successful or an error code.
-   NOTE: no mutex please!
-*/
-static int auerswald_int_open (pauerswald_t cp)
-{
-        int ret;
-	struct usb_host_endpoint *ep;
-	int irqsize;
-	dbg ("auerswald_int_open");
-
-	ep = cp->usbdev->ep_in[AU_IRQENDP];
-	if (!ep) {
-		ret = -EFAULT;
-  		goto intoend;
-    	}
-	irqsize = le16_to_cpu(ep->desc.wMaxPacketSize);
-	cp->irqsize = irqsize;
-
-	/* allocate the urb and data buffer */
-        if (!cp->inturbp) {
-                cp->inturbp = usb_alloc_urb (0, GFP_KERNEL);
-                if (!cp->inturbp) {
-                        ret = -ENOMEM;
-                        goto intoend;
-                }
-        }
-        if (!cp->intbufp) {
-                cp->intbufp = kmalloc (irqsize, GFP_KERNEL);
-                if (!cp->intbufp) {
-                        ret = -ENOMEM;
-                        goto intoend;
-                }
-        }
-        /* setup urb */
-        usb_fill_int_urb (cp->inturbp, cp->usbdev,
-			usb_rcvintpipe (cp->usbdev,AU_IRQENDP), cp->intbufp,
-			irqsize, auerswald_int_complete, cp, ep->desc.bInterval);
-        /* start the urb */
-	cp->inturbp->status = 0;	/* needed! */
-	ret = usb_submit_urb (cp->inturbp, GFP_KERNEL);
-
-intoend:
-        if (ret < 0) {
-                /* activation of interrupt endpoint has failed. Now clean up. */
-                dbg ("auerswald_int_open: activation of int endpoint failed");
-
-                /* deallocate memory */
-                auerswald_int_free (cp);
-        }
-        return ret;
-}
-
-/* This function is called to deactivate the interrupt
-   endpoint. This function returns 0 if successful or an error code.
-   NOTE: no mutex please!
-*/
-static void auerswald_int_release (pauerswald_t cp)
-{
-        dbg ("auerswald_int_release");
-
-        /* stop the int endpoint */
-	usb_kill_urb (cp->inturbp);
-
-        /* deallocate memory */
-        auerswald_int_free (cp);
-}
-
-/* --------------------------------------------------------------------- */
-/* Helper functions                                                      */
-
-/* wake up waiting readers */
-static void auerchar_disconnect (pauerscon_t scp)
-{
-        pauerchar_t ccp = ((pauerchar_t)((char *)(scp)-(unsigned long)(&((pauerchar_t)0)->scontext)));
-	dbg ("auerchar_disconnect called");
-	ccp->removed = 1;
-	wake_up (&ccp->readwait);
-}
-
-
-/* dispatch a read paket to a waiting character device */
-static void auerchar_ctrlread_dispatch (pauerscon_t scp, pauerbuf_t bp)
-{
-	unsigned long flags;
-        pauerchar_t ccp;
-        pauerbuf_t newbp = NULL;
-        char * charp;
-        dbg ("auerchar_ctrlread_dispatch called");
-        ccp = ((pauerchar_t)((char *)(scp)-(unsigned long)(&((pauerchar_t)0)->scontext)));
-
-        /* get a read buffer from character device context */
-        spin_lock_irqsave (&ccp->bufctl.lock, flags);
-        if (!list_empty (&ccp->bufctl.free_buff_list)) {
-                /* yes: get the entry */
-                struct list_head *tmp = ccp->bufctl.free_buff_list.next;
-                list_del (tmp);
-                newbp = list_entry (tmp, auerbuf_t, buff_list);
-        }
-        spin_unlock_irqrestore (&ccp->bufctl.lock, flags);
-
-        if (!newbp) {
-                dbg ("No read buffer available, discard paket!");
-                return;     /* no buffer, no dispatch */
-        }
-
-        /* copy information to new buffer element
-           (all buffers have the same length) */
-        charp = newbp->bufp;
-        newbp->bufp = bp->bufp;
-        bp->bufp = charp;
-        newbp->len = bp->len;
-
-        /* insert new buffer in read list */
-        spin_lock_irqsave (&ccp->bufctl.lock, flags);
-	list_add_tail (&newbp->buff_list, &ccp->bufctl.rec_buff_list);
-        spin_unlock_irqrestore (&ccp->bufctl.lock, flags);
-        dbg ("read buffer appended to rec_list");
-
-        /* wake up pending synchronous reads */
-	wake_up (&ccp->readwait);
-}
-
-
-/* Delete an auerswald driver context */
-static void auerswald_delete( pauerswald_t cp)
-{
-	dbg( "auerswald_delete");
-	if (cp == NULL)
-		return;
-
-	/* Wake up all processes waiting for a buffer */
-	wake_up (&cp->bufferwait);
-
-	/* Cleaning up */
-	auerswald_int_release (cp);
-	auerchain_free (&cp->controlchain);
-	auerbuf_free_buffers (&cp->bufctl);
-
-	/* release the memory */
-	kfree( cp);
-}
-
-
-/* Delete an auerswald character context */
-static void auerchar_delete( pauerchar_t ccp)
-{
-	dbg ("auerchar_delete");
-	if (ccp == NULL)
-		return;
-
-        /* wake up pending synchronous reads */
-	ccp->removed = 1;
-	wake_up (&ccp->readwait);
-
-	/* remove the read buffer */
-	if (ccp->readbuf) {
-		auerbuf_releasebuf (ccp->readbuf);
-		ccp->readbuf = NULL;
-	}
-
-	/* remove the character buffers */
-	auerbuf_free_buffers (&ccp->bufctl);
-
-	/* release the memory */
-	kfree( ccp);
-}
-
-
-/* add a new service to the device
-   scp->id must be set!
-   return: 0 if OK, else error code
-*/
-static int auerswald_addservice (pauerswald_t cp, pauerscon_t scp)
-{
-	int ret;
-
-	/* is the device available? */
-	if (!cp->usbdev) {
-		dbg ("usbdev == NULL");
-		return -EIO;	/*no: can not add a service, sorry*/
-	}
-
-	/* is the service available? */
-	if (cp->services[scp->id]) {
-		dbg ("service is busy");
-                return -EBUSY;
-	}
-
-	/* device is available, service is free */
-	cp->services[scp->id] = scp;
-
-	/* register service in device */
-	ret = auerchain_control_msg(
-		&cp->controlchain,                      /* pointer to control chain */
-		cp->usbdev,                             /* pointer to device */
-		usb_sndctrlpipe (cp->usbdev, 0),        /* pipe to control endpoint */
-		AUV_CHANNELCTL,                         /* USB message request value */
-		AUT_WREQ,                               /* USB message request type value */
-		0x01,              /* open                 USB message value */
-		scp->id,            		        /* USB message index value */
-		NULL,                                   /* pointer to the data to send */
-		0,                                      /* length in bytes of the data to send */
-		HZ * 2);                                /* time to wait for the message to complete before timing out */
-	if (ret < 0) {
-		dbg ("auerswald_addservice: auerchain_control_msg returned error code %d", ret);
-		/* undo above actions */
-		cp->services[scp->id] = NULL;
-		return ret;
-	}
-
-	dbg ("auerswald_addservice: channel open OK");
-	return 0;
-}
-
-
-/* remove a service from the device
-   scp->id must be set! */
-static void auerswald_removeservice (pauerswald_t cp, pauerscon_t scp)
-{
-	dbg ("auerswald_removeservice called");
-
-	/* check if we have a service allocated */
-	if (scp->id == AUH_UNASSIGNED)
-		return;
-
-	/* If there is a device: close the channel */
-	if (cp->usbdev) {
-		/* Close the service channel inside the device */
-		int ret = auerchain_control_msg(
-		&cp->controlchain,            		/* pointer to control chain */
-		cp->usbdev,         		        /* pointer to device */
-		usb_sndctrlpipe (cp->usbdev, 0),	/* pipe to control endpoint */
-		AUV_CHANNELCTL,                         /* USB message request value */
-		AUT_WREQ,                               /* USB message request type value */
-		0x00,              // close             /* USB message value */
-		scp->id,            		        /* USB message index value */
-		NULL,                                   /* pointer to the data to send */
-		0,                                      /* length in bytes of the data to send */
-		HZ * 2);                                /* time to wait for the message to complete before timing out */
-		if (ret < 0) {
-			dbg ("auerswald_removeservice: auerchain_control_msg returned error code %d", ret);
-		}
-		else {
-			dbg ("auerswald_removeservice: channel close OK");
-		}
-	}
-
-	/* remove the service from the device */
-	cp->services[scp->id] = NULL;
-	scp->id = AUH_UNASSIGNED;
-}
-
-
-/* --------------------------------------------------------------------- */
-/* Char device functions                                                 */
-
-/* Open a new character device */
-static int auerchar_open (struct inode *inode, struct file *file)
-{
-	int dtindex = iminor(inode);
-	pauerswald_t cp = NULL;
-	pauerchar_t ccp = NULL;
-	struct usb_interface *intf;
-        int ret;
-
-        /* minor number in range? */
-	if (dtindex < 0) {
-		return -ENODEV;
-        }
-	intf = usb_find_interface(&auerswald_driver, dtindex);
-	if (!intf) {
-		return -ENODEV;
-	}
-
-	/* usb device available? */
-	cp = usb_get_intfdata (intf);
-	if (cp == NULL) {
-		return -ENODEV;
-	}
-	if (mutex_lock_interruptible(&cp->mutex)) {
-		return -ERESTARTSYS;
-	}
-
-	/* we have access to the device. Now lets allocate memory */
-	ccp = kzalloc(sizeof(auerchar_t), GFP_KERNEL);
-	if (ccp == NULL) {
-		err ("out of memory");
-		ret = -ENOMEM;
-		goto ofail;
-	}
-
-	/* Initialize device descriptor */
-	mutex_init(&ccp->mutex);
-	mutex_init(&ccp->readmutex);
-        auerbuf_init (&ccp->bufctl);
-        ccp->scontext.id = AUH_UNASSIGNED;
-        ccp->scontext.dispatch = auerchar_ctrlread_dispatch;
-	ccp->scontext.disconnect = auerchar_disconnect;
-	init_waitqueue_head (&ccp->readwait);
-
-	ret = auerbuf_setup (&ccp->bufctl, AU_RBUFFERS, cp->maxControlLength+AUH_SIZE);
-       	if (ret) {
-		goto ofail;
-	}
-
-	cp->open_count++;
-	ccp->auerdev = cp;
-	dbg("open %s as /dev/%s", cp->dev_desc, cp->name);
-	mutex_unlock(&cp->mutex);
-
-	/* file IO stuff */
-	file->f_pos = 0;
-	file->private_data = ccp;
-	return nonseekable_open(inode, file);
-
-	/* Error exit */
-ofail:	mutex_unlock(&cp->mutex);
-	auerchar_delete (ccp);
-	return ret;
-}
-
-
-/* IOCTL functions */
-static long auerchar_ioctl(struct file *file, unsigned int cmd,
-							unsigned long arg)
-{
-	pauerchar_t ccp = (pauerchar_t) file->private_data;
-	int ret = 0;
-        audevinfo_t devinfo;
-        pauerswald_t cp = NULL;
-	unsigned int u;
-	unsigned int __user *user_arg = (unsigned int __user *)arg;
-
-        dbg ("ioctl");
-
-	/* get the mutexes */
-	if (mutex_lock_interruptible(&ccp->mutex)) {
-		return -ERESTARTSYS;
-	}
-	cp = ccp->auerdev;
-	if (!cp) {
-		mutex_unlock(&ccp->mutex);
-                return -ENODEV;
-	}
-	if (mutex_lock_interruptible(&cp->mutex)) {
-		mutex_unlock(&ccp->mutex);
-		return -ERESTARTSYS;
-	}
-
-	/* Check for removal */
-	if (!cp->usbdev) {
-		mutex_unlock(&cp->mutex);
-		mutex_unlock(&ccp->mutex);
-                return -ENODEV;
-	}
-	lock_kernel();
-	switch (cmd) {
-
-	/* return != 0 if Transmitt channel ready to send */
-	case IOCTL_AU_TXREADY:
-		dbg ("IOCTL_AU_TXREADY");
-		u   = ccp->auerdev
-		   && (ccp->scontext.id != AUH_UNASSIGNED)
-		   && !list_empty (&cp->bufctl.free_buff_list);
-	        ret = put_user (u, user_arg);
-		break;
-
-	/* return != 0 if connected to a service channel */
-	case IOCTL_AU_CONNECT:
-		dbg ("IOCTL_AU_CONNECT");
-		u = (ccp->scontext.id != AUH_UNASSIGNED);
-	        ret = put_user (u, user_arg);
-		break;
-
-	/* return != 0 if Receive Data available */
-	case IOCTL_AU_RXAVAIL:
-		dbg ("IOCTL_AU_RXAVAIL");
-		if (ccp->scontext.id == AUH_UNASSIGNED) {
-                        ret = -EIO;
-                        break;
-                }
-		u = 0;	/* no data */
-		if (ccp->readbuf) {
-			int restlen = ccp->readbuf->len - ccp->readoffset;
-			if (restlen > 0)
-				u = 1;
-		}
-		if (!u) {
-        		if (!list_empty (&ccp->bufctl.rec_buff_list)) {
-				u = 1;
-			}
-		}
-	        ret = put_user (u, user_arg);
-		break;
-
-	/* return the max. buffer length for the device */
-	case IOCTL_AU_BUFLEN:
-		dbg ("IOCTL_AU_BUFLEN");
-		u = cp->maxControlLength;
-	        ret = put_user (u, user_arg);
-		break;
-
-	/* requesting a service channel */
-        case IOCTL_AU_SERVREQ:
-		dbg ("IOCTL_AU_SERVREQ");
-                /* requesting a service means: release the previous one first */
-		auerswald_removeservice (cp, &ccp->scontext);
-		/* get the channel number */
-		ret = get_user (u, user_arg);
-		if (ret) {
-			break;
-		}
-		if ((u < AUH_FIRSTUSERCH) || (u >= AUH_TYPESIZE)) {
-                        ret = -EIO;
-                        break;
-                }
-                dbg ("auerchar service request parameters are ok");
-		ccp->scontext.id = u;
-
-		/* request the service now */
-		ret = auerswald_addservice (cp, &ccp->scontext);
-		if (ret) {
-			/* no: revert service entry */
-                	ccp->scontext.id = AUH_UNASSIGNED;
-		}
-		break;
-
-	/* get a string descriptor for the device */
-	case IOCTL_AU_DEVINFO:
-		dbg ("IOCTL_AU_DEVINFO");
-                if (copy_from_user (&devinfo, (void __user *) arg, sizeof (audevinfo_t))) {
-        		ret = -EFAULT;
-	        	break;
-                }
-		u = strlen(cp->dev_desc)+1;
-		if (u > devinfo.bsize) {
-			u = devinfo.bsize;
-		}
-		ret = copy_to_user(devinfo.buf, cp->dev_desc, u) ? -EFAULT : 0;
-		break;
-
-	/* get the max. string descriptor length */
-        case IOCTL_AU_SLEN:
-		dbg ("IOCTL_AU_SLEN");
-		u = AUSI_DLEN;
-	        ret = put_user (u, user_arg);
-		break;
-
-	default:
-		dbg ("IOCTL_AU_UNKNOWN");
-		ret = -ENOTTY;
-		break;
-        }
-        unlock_kernel();
-	/* release the mutexes */
-	mutex_unlock(&cp->mutex);
-	mutex_unlock(&ccp->mutex);
-	return ret;
-}
-
-/* Read data from the device */
-static ssize_t auerchar_read (struct file *file, char __user *buf, size_t count, loff_t * ppos)
-{
-        unsigned long flags;
-	pauerchar_t ccp = (pauerchar_t) file->private_data;
-        pauerbuf_t   bp = NULL;
-	wait_queue_t wait;
-
-        dbg ("auerchar_read");
-
-	/* Error checking */
-	if (!ccp)
-		return -EIO;
-	if (*ppos)
- 		return -ESPIPE;
-        if (count == 0)
-		return 0;
-
-	/* get the mutex */
-	if (mutex_lock_interruptible(&ccp->mutex))
-		return -ERESTARTSYS;
-
-	/* Can we expect to read something? */
-	if (ccp->scontext.id == AUH_UNASSIGNED) {
-		mutex_unlock(&ccp->mutex);
-                return -EIO;
-	}
-
-	/* only one reader per device allowed */
-	if (mutex_lock_interruptible(&ccp->readmutex)) {
-		mutex_unlock(&ccp->mutex);
-		return -ERESTARTSYS;
-	}
-
-	/* read data from readbuf, if available */
-doreadbuf:
-	bp = ccp->readbuf;
-	if (bp) {
-		/* read the maximum bytes */
-		int restlen = bp->len - ccp->readoffset;
-		if (restlen < 0)
-			restlen = 0;
-		if (count > restlen)
-			count = restlen;
-		if (count) {
-			if (copy_to_user (buf, bp->bufp+ccp->readoffset, count)) {
-				dbg ("auerswald_read: copy_to_user failed");
-				mutex_unlock(&ccp->readmutex);
-				mutex_unlock(&ccp->mutex);
-				return -EFAULT;
-			}
-		}
-		/* advance the read offset */
-		ccp->readoffset += count;
-		restlen -= count;
-		// reuse the read buffer
-		if (restlen <= 0) {
-			auerbuf_releasebuf (bp);
-			ccp->readbuf = NULL;
-		}
-		/* return with number of bytes read */
-		if (count) {
-			mutex_unlock(&ccp->readmutex);
-			mutex_unlock(&ccp->mutex);
-			return count;
-		}
-	}
-
-	/* a read buffer is not available. Try to get the next data block. */
-doreadlist:
-	/* Preparing for sleep */
-	init_waitqueue_entry (&wait, current);
-	set_current_state (TASK_INTERRUPTIBLE);
-	add_wait_queue (&ccp->readwait, &wait);
-
-	bp = NULL;
-	spin_lock_irqsave (&ccp->bufctl.lock, flags);
-        if (!list_empty (&ccp->bufctl.rec_buff_list)) {
-                /* yes: get the entry */
-                struct list_head *tmp = ccp->bufctl.rec_buff_list.next;
-                list_del (tmp);
-                bp = list_entry (tmp, auerbuf_t, buff_list);
-        }
-        spin_unlock_irqrestore (&ccp->bufctl.lock, flags);
-
-	/* have we got data? */
-	if (bp) {
-		ccp->readbuf = bp;
-		ccp->readoffset = AUH_SIZE; /* for headerbyte */
-		set_current_state (TASK_RUNNING);
-		remove_wait_queue (&ccp->readwait, &wait);
-		goto doreadbuf;		  /* now we can read! */
-	}
-
-	/* no data available. Should we wait? */
-	if (file->f_flags & O_NONBLOCK) {
-                dbg ("No read buffer available, returning -EAGAIN");
-		set_current_state (TASK_RUNNING);
-		remove_wait_queue (&ccp->readwait, &wait);
-		mutex_unlock(&ccp->readmutex);
-		mutex_unlock(&ccp->mutex);
-		return -EAGAIN;  /* nonblocking, no data available */
-        }
-
-	/* yes, we should wait! */
-	mutex_unlock(&ccp->mutex); /* allow other operations while we wait */
-	schedule();
-	remove_wait_queue (&ccp->readwait, &wait);
-	if (signal_pending (current)) {
-		/* waked up by a signal */
-		mutex_unlock(&ccp->readmutex);
-		return -ERESTARTSYS;
-	}
-
-	/* Anything left to read? */
-	if ((ccp->scontext.id == AUH_UNASSIGNED) || ccp->removed) {
-		mutex_unlock(&ccp->readmutex);
-		return -EIO;
-	}
-
-	if (mutex_lock_interruptible(&ccp->mutex)) {
-		mutex_unlock(&ccp->readmutex);
-		return -ERESTARTSYS;
-	}
-
-	/* try to read the incoming data again */
-	goto doreadlist;
-}
-
-
-/* Write a data block into the right service channel of the device */
-static ssize_t auerchar_write (struct file *file, const char __user *buf, size_t len, loff_t *ppos)
-{
-	pauerchar_t ccp = (pauerchar_t) file->private_data;
-        pauerswald_t cp = NULL;
-        pauerbuf_t bp;
-        unsigned long flags;
-	int ret;
-	wait_queue_t wait;
-
-        dbg ("auerchar_write %zd bytes", len);
-
-	/* Error checking */
-	if (!ccp)
-		return -EIO;
-        if (*ppos)
-		return -ESPIPE;
-        if (len == 0)
-                return 0;
-
-write_again:
-	/* get the mutex */
-	if (mutex_lock_interruptible(&ccp->mutex))
-		return -ERESTARTSYS;
-
-	/* Can we expect to write something? */
-	if (ccp->scontext.id == AUH_UNASSIGNED) {
-		mutex_unlock(&ccp->mutex);
-                return -EIO;
-	}
-
-	cp = ccp->auerdev;
-	if (!cp) {
-		mutex_unlock(&ccp->mutex);
-		return -ERESTARTSYS;
-	}
-	if (mutex_lock_interruptible(&cp->mutex)) {
-		mutex_unlock(&ccp->mutex);
-		return -ERESTARTSYS;
-	}
-	if (!cp->usbdev) {
-		mutex_unlock(&cp->mutex);
-		mutex_unlock(&ccp->mutex);
-		return -EIO;
-	}
-	/* Prepare for sleep */
-	init_waitqueue_entry (&wait, current);
-	set_current_state (TASK_INTERRUPTIBLE);
-	add_wait_queue (&cp->bufferwait, &wait);
-
-	/* Try to get a buffer from the device pool.
-	   We can't use a buffer from ccp->bufctl because the write
-	   command will last beond a release() */
-	bp = NULL;
-	spin_lock_irqsave (&cp->bufctl.lock, flags);
-        if (!list_empty (&cp->bufctl.free_buff_list)) {
-                /* yes: get the entry */
-                struct list_head *tmp = cp->bufctl.free_buff_list.next;
-                list_del (tmp);
-                bp = list_entry (tmp, auerbuf_t, buff_list);
-        }
-        spin_unlock_irqrestore (&cp->bufctl.lock, flags);
-
-	/* are there any buffers left? */
-	if (!bp) {
-		mutex_unlock(&cp->mutex);
-		mutex_unlock(&ccp->mutex);
-
-		/* NONBLOCK: don't wait */
-		if (file->f_flags & O_NONBLOCK) {
-			set_current_state (TASK_RUNNING);
-			remove_wait_queue (&cp->bufferwait, &wait);
-			return -EAGAIN;
-		}
-
-		/* BLOCKING: wait */
-		schedule();
-		remove_wait_queue (&cp->bufferwait, &wait);
-		if (signal_pending (current)) {
-			/* waked up by a signal */
-			return -ERESTARTSYS;
-		}
-		goto write_again;
-	} else {
-		set_current_state (TASK_RUNNING);
-		remove_wait_queue (&cp->bufferwait, &wait);
-	}
-
-	/* protect against too big write requests */
-	if (len > cp->maxControlLength)
-		len = cp->maxControlLength;
-
-	/* Fill the buffer */
-	if (copy_from_user ( bp->bufp+AUH_SIZE, buf, len)) {
-		dbg ("copy_from_user failed");
-		auerbuf_releasebuf (bp);
-		/* Wake up all processes waiting for a buffer */
-		wake_up (&cp->bufferwait);
-		mutex_unlock(&cp->mutex);
-		mutex_unlock(&ccp->mutex);
-		return -EFAULT;
-	}
-
-	/* set the header byte */
-        *(bp->bufp) = ccp->scontext.id | AUH_DIRECT | AUH_UNSPLIT;
-
-	/* Set the transfer Parameters */
-	bp->len = len+AUH_SIZE;
-        bp->dr->bRequestType = AUT_WREQ;
-	bp->dr->bRequest     = AUV_WBLOCK;
-	bp->dr->wValue       = cpu_to_le16 (0);
-	bp->dr->wIndex       = cpu_to_le16 (ccp->scontext.id | AUH_DIRECT | AUH_UNSPLIT);
-	bp->dr->wLength      = cpu_to_le16 (len+AUH_SIZE);
-	usb_fill_control_urb (bp->urbp, cp->usbdev, usb_sndctrlpipe (cp->usbdev, 0),
-                   (unsigned char*)bp->dr, bp->bufp, len+AUH_SIZE,
-		    auerchar_ctrlwrite_complete, bp);
-	/* up we go */
-	ret = auerchain_submit_urb (&cp->controlchain, bp->urbp);
-	mutex_unlock(&cp->mutex);
-	if (ret) {
-		dbg ("auerchar_write: nonzero result of auerchain_submit_urb %d", ret);
-		auerbuf_releasebuf (bp);
-		/* Wake up all processes waiting for a buffer */
-		wake_up (&cp->bufferwait);
-		mutex_unlock(&ccp->mutex);
-		return -EIO;
-	}
-	else {
-		dbg ("auerchar_write: Write OK");
-		mutex_unlock(&ccp->mutex);
-		return len;
-	}
-}
-
-
-/* Close a character device */
-static int auerchar_release (struct inode *inode, struct file *file)
-{
-	pauerchar_t ccp = (pauerchar_t) file->private_data;
-	pauerswald_t cp;
-	dbg("release");
-
-	mutex_lock(&ccp->mutex);
-	cp = ccp->auerdev;
-	if (cp) {
-		mutex_lock(&cp->mutex);
-		/* remove an open service */
-		auerswald_removeservice (cp, &ccp->scontext);
-		/* detach from device */
-		if ((--cp->open_count <= 0) && (cp->usbdev == NULL)) {
-			/* usb device waits for removal */
-			mutex_unlock(&cp->mutex);
-			auerswald_delete (cp);
-		} else {
-			mutex_unlock(&cp->mutex);
-		}
-		cp = NULL;
-		ccp->auerdev = NULL;
-	}
-	mutex_unlock(&ccp->mutex);
-	auerchar_delete (ccp);
-
-	return 0;
-}
-
-
-/*----------------------------------------------------------------------*/
-/* File operation structure                                             */
-static const struct file_operations auerswald_fops =
-{
-	.owner =	THIS_MODULE,
-	.llseek =	no_llseek,
-	.read =		auerchar_read,
-	.write =        auerchar_write,
-	.unlocked_ioctl = auerchar_ioctl,
-	.open =		auerchar_open,
-	.release =	auerchar_release,
-};
-
-static struct usb_class_driver auerswald_class = {
-	.name =		"auer%d",
-	.fops =		&auerswald_fops,
-	.minor_base =	AUER_MINOR_BASE,
-};
-
-
-/* --------------------------------------------------------------------- */
-/* Special USB driver functions                                          */
-
-/* Probe if this driver wants to serve an USB device
-
-   This entry point is called whenever a new device is attached to the bus.
-   Then the device driver has to create a new instance of its internal data
-   structures for the new device.
-
-   The  dev argument specifies the device context, which contains pointers
-   to all USB descriptors. The  interface argument specifies the interface
-   number. If a USB driver wants to bind itself to a particular device and
-   interface it has to return a pointer. This pointer normally references
-   the device driver's context structure.
-
-   Probing normally is done by checking the vendor and product identifications
-   or the class and subclass definitions. If they match the interface number
-   is compared with the ones supported by the driver. When probing is done
-   class based it might be necessary to parse some more USB descriptors because
-   the device properties can differ in a wide range.
-*/
-static int auerswald_probe (struct usb_interface *intf,
-			    const struct usb_device_id *id)
-{
-	struct usb_device *usbdev = interface_to_usbdev(intf);
-	pauerswald_t cp = NULL;
-	unsigned int u = 0;
-	__le16 *pbuf;
-	int ret;
-
-	dbg ("probe: vendor id 0x%x, device id 0x%x",
-	     le16_to_cpu(usbdev->descriptor.idVendor),
-	     le16_to_cpu(usbdev->descriptor.idProduct));
-
-        /* we use only the first -and only- interface */
-        if (intf->altsetting->desc.bInterfaceNumber != 0)
-		return -ENODEV;
-
-	/* allocate memory for our device and initialize it */
-	cp = kzalloc (sizeof(auerswald_t), GFP_KERNEL);
-	if (cp == NULL) {
-		err ("out of memory");
-		goto pfail;
-	}
-
-	/* Initialize device descriptor */
-	mutex_init(&cp->mutex);
-	cp->usbdev = usbdev;
-	auerchain_init (&cp->controlchain);
-        auerbuf_init (&cp->bufctl);
-	init_waitqueue_head (&cp->bufferwait);
-
-	ret = usb_register_dev(intf, &auerswald_class);
-	if (ret) {
-		err ("Not able to get a minor for this device.");
-		goto pfail;
-	}
-
-	/* Give the device a name */
-	sprintf (cp->name, "usb/auer%d", intf->minor);
-
-	/* Store the index */
-	cp->dtindex = intf->minor;
-
-	/* Get the usb version of the device */
-	cp->version = le16_to_cpu(cp->usbdev->descriptor.bcdDevice);
-	dbg ("Version is %X", cp->version);
-
-	/* allow some time to settle the device */
-	msleep(334);
-
-	/* Try to get a suitable textual description of the device */
-	/* Device name:*/
-	ret = usb_string( cp->usbdev, AUSI_DEVICE, cp->dev_desc, AUSI_DLEN-1);
-	if (ret >= 0) {
-		u += ret;
-		/* Append Serial Number */
-		memcpy(&cp->dev_desc[u], ",Ser# ", 6);
-		u += 6;
-		ret = usb_string( cp->usbdev, AUSI_SERIALNR, &cp->dev_desc[u], AUSI_DLEN-u-1);
-		if (ret >= 0) {
-			u += ret;
-			/* Append subscriber number */
-			memcpy(&cp->dev_desc[u], ", ", 2);
-			u += 2;
-			ret = usb_string( cp->usbdev, AUSI_MSN, &cp->dev_desc[u], AUSI_DLEN-u-1);
-			if (ret >= 0) {
-				u += ret;
-			}
-		}
-	}
-	cp->dev_desc[u] = '\0';
-	info("device is a %s", cp->dev_desc);
-
-        /* get the maximum allowed control transfer length */
-        pbuf = kmalloc(2, GFP_KERNEL);    /* use an allocated buffer because of urb target */
-        if (!pbuf) {
-		err( "out of memory");
-		goto pfail;
-	}
-        ret = usb_control_msg(cp->usbdev,           /* pointer to device */
-                usb_rcvctrlpipe( cp->usbdev, 0 ),   /* pipe to control endpoint */
-                AUV_GETINFO,                        /* USB message request value */
-                AUT_RREQ,                           /* USB message request type value */
-                0,                                  /* USB message value */
-                AUDI_MBCTRANS,                      /* USB message index value */
-                pbuf,                               /* pointer to the receive buffer */
-                2,                                  /* length of the buffer */
-                2000);                            /* time to wait for the message to complete before timing out */
-        if (ret == 2) {
-	        cp->maxControlLength = le16_to_cpup(pbuf);
-                kfree(pbuf);
-                dbg("setup: max. allowed control transfersize is %d bytes", cp->maxControlLength);
-        } else {
-                kfree(pbuf);
-                err("setup: getting max. allowed control transfer length failed with error %d", ret);
-		goto pfail;
-        }
-
-	/* allocate a chain for the control messages */
-        if (auerchain_setup (&cp->controlchain, AUCH_ELEMENTS)) {
-		err ("out of memory");
-		goto pfail;
-	}
-
-        /* allocate buffers for control messages */
-	if (auerbuf_setup (&cp->bufctl, AU_RBUFFERS, cp->maxControlLength+AUH_SIZE)) {
-		err ("out of memory");
-		goto pfail;
-	}
-
-	/* start the interrupt endpoint */
-	if (auerswald_int_open (cp)) {
-		err ("int endpoint failed");
-		goto pfail;
-	}
-
-	/* all OK */
-	usb_set_intfdata (intf, cp);
-	return 0;
-
-	/* Error exit: clean up the memory */
-pfail:	auerswald_delete (cp);
-	return -EIO;
-}
-
-
-/* Disconnect driver from a served device
-
-   This function is called whenever a device which was served by this driver
-   is disconnected.
-
-   The argument  dev specifies the device context and the  driver_context
-   returns a pointer to the previously registered  driver_context of the
-   probe function. After returning from the disconnect function the USB
-   framework completely deallocates all data structures associated with
-   this device. So especially the usb_device structure must not be used
-   any longer by the usb driver.
-*/
-static void auerswald_disconnect (struct usb_interface *intf)
-{
-	pauerswald_t cp = usb_get_intfdata (intf);
-	unsigned int u;
-
-	usb_set_intfdata (intf, NULL);
-	if (!cp)
-		return;
-
-	/* give back our USB minor number */
-	usb_deregister_dev(intf, &auerswald_class);
-
-	mutex_lock(&cp->mutex);
-	info ("device /dev/%s now disconnecting", cp->name);
-
-	/* Stop the interrupt endpoint */
-	auerswald_int_release (cp);
-
-	/* remove the control chain allocated in auerswald_probe
-	   This has the benefit of
-	   a) all pending (a)synchronous urbs are unlinked
-	   b) all buffers dealing with urbs are reclaimed
-	*/
-	auerchain_free (&cp->controlchain);
-
-	if (cp->open_count == 0) {
-		/* nobody is using this device. So we can clean up now */
-		mutex_unlock(&cp->mutex);
-		/* mutex_unlock() is possible here because no other task
-		   can open the device (see above). I don't want
-		   to kfree() a locked mutex. */
-
-		auerswald_delete (cp);
-	} else {
-		/* device is used. Remove the pointer to the
-		   usb device (it's not valid any more). The last
-		   release() will do the clean up */
-		cp->usbdev = NULL;
-		mutex_unlock(&cp->mutex);
-		/* Terminate waiting writers */
-		wake_up (&cp->bufferwait);
-		/* Inform all waiting readers */
-		for ( u = 0; u < AUH_TYPESIZE; u++) {
-			pauerscon_t scp = cp->services[u];
-			if (scp)
-				scp->disconnect( scp);
-		}
-	}
-}
-
-/* Descriptor for the devices which are served by this driver.
-   NOTE: this struct is parsed by the usbmanager install scripts.
-         Don't change without caution!
-*/
-static struct usb_device_id auerswald_ids [] = {
-	{ USB_DEVICE (ID_AUERSWALD, 0x00C0) },          /* COMpact 2104 USB */
-	{ USB_DEVICE (ID_AUERSWALD, 0x00DB) },          /* COMpact 4410/2206 USB */
-	{ USB_DEVICE (ID_AUERSWALD, 0x00DC) }, /* COMpact 4406 DSL */
-	{ USB_DEVICE (ID_AUERSWALD, 0x00DD) }, /* COMpact 2204 USB */
-	{ USB_DEVICE (ID_AUERSWALD, 0x00F1) },          /* Comfort 2000 System Telephone */
-	{ USB_DEVICE (ID_AUERSWALD, 0x00F2) },          /* Comfort 1200 System Telephone */
-        { }			                        /* Terminating entry */
-};
-
-/* Standard module device table */
-MODULE_DEVICE_TABLE (usb, auerswald_ids);
-
-/* Standard usb driver struct */
-static struct usb_driver auerswald_driver = {
-	.name =		"auerswald",
-	.probe =	auerswald_probe,
-	.disconnect =	auerswald_disconnect,
-	.id_table =	auerswald_ids,
-};
-
-
-/* --------------------------------------------------------------------- */
-/* Module loading/unloading                                              */
-
-/* Driver initialisation. Called after module loading.
-   NOTE: there is no concurrency at _init
-*/
-static int __init auerswald_init (void)
-{
-	int result;
-	dbg ("init");
-
-	/* register driver at the USB subsystem */
-	result = usb_register (&auerswald_driver);
-	if (result < 0) {
-		err ("driver could not be registered");
-		return -1;
-	}
-	return 0;
-}
-
-/* Driver deinit. Called before module removal.
-   NOTE: there is no concurrency at _cleanup
-*/
-static void __exit auerswald_cleanup (void)
-{
-	dbg ("cleanup");
-	usb_deregister (&auerswald_driver);
-}
-
-/* --------------------------------------------------------------------- */
-/* Linux device driver module description                                */
-
-MODULE_AUTHOR (DRIVER_AUTHOR);
-MODULE_DESCRIPTION (DRIVER_DESC);
-MODULE_LICENSE ("GPL");
-
-module_init (auerswald_init);
-module_exit (auerswald_cleanup);
-
-/* --------------------------------------------------------------------- */
-