Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

23 files changed, 36688 insertions, 0 deletions

diff --git a/drivers/usb/misc/Kconfig b/drivers/usb/misc/Kconfig
new file mode 100644
index 00000000000..3a896954b3a
--- /dev/null
+++ b/drivers/usb/misc/Kconfig
@@ -0,0 +1,152 @@
+#
+# USB Miscellaneous driver configuration
+#
+comment "USB Miscellaneous drivers"
+	depends on USB
+
+config USB_EMI62
+	tristate "EMI 6|2m USB Audio interface support"
+	depends on USB
+	---help---
+	  This driver loads firmware to Emagic EMI 6|2m low latency USB
+	  Audio and Midi interface.
+
+	  After firmware load the device is handled with standard linux
+	  USB Audio driver.
+
+	  This code is also available as a module ( = code which can be
+	  inserted in and removed from the running kernel whenever you want).
+	  The module will be called audio. If you want to compile it as a
+	  module, say M here and read <file:Documentation/kbuild/modules.txt>.
+
+config USB_EMI26
+	tristate "EMI 2|6 USB Audio interface support"
+	depends on USB
+	---help---
+	  This driver loads firmware to Emagic EMI 2|6 low latency USB
+	  Audio interface.
+
+	  After firmware load the device is handled with standard linux
+	  USB Audio driver.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called emi26.
+
+config USB_AUERSWALD
+	tristate "USB Auerswald ISDN support (EXPERIMENTAL)"
+	depends on USB && EXPERIMENTAL
+	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 (EXPERIMENTAL)"
+	depends on USB && EXPERIMENTAL
+	help
+	  Say Y here if you want to connect a USB Rio500 mp3 player to your
+	  computer's USB port. Please read <file:Documentation/usb/rio.txt>
+	  for more information.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called rio500.
+
+config USB_LEGOTOWER
+	tristate "USB Lego Infrared Tower support (EXPERIMENTAL)"
+	depends on USB && EXPERIMENTAL
+	help
+	  Say Y here if you want to connect a USB Lego Infrared Tower to your
+	  computer's USB port.
+
+	  This code is also available as a module ( = code which can be
+	  inserted in and removed from the running kernel whenever you want).
+	  The module will be called legousbtower. If you want to compile it as
+	  a module, say M here and read
+	  <file:Documentation/kbuild/modules.txt>.
+
+config USB_LCD
+	tristate "USB LCD driver support"
+	depends on USB
+	help
+	  Say Y here if you want to connect an USBLCD to your computer's
+	  USB port. The USBLCD is a small USB interface board for
+	  alphanumeric LCD modules. See <http://www.usblcd.de/> for more
+	  information.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called usblcd.
+
+config USB_LED
+	tristate "USB LED driver support"
+	depends on USB
+	help
+	  Say Y here if you want to connect an USBLED device to your 
+	  computer's USB port.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called usbled.
+
+config USB_CYTHERM
+	tristate "Cypress USB thermometer driver support"
+	depends on USB
+	help
+	  Say Y here if you want to connect a Cypress USB thermometer
+	  device to your computer's USB port. This device is also known
+	  as the Cypress USB Starter kit or demo board. The Elektor
+	  magazine published a modified version of this device in issue 
+	  #291.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called cytherm.
+
+config USB_PHIDGETKIT
+	tristate "USB PhidgetKit support"
+	depends on USB
+	help
+	  Say Y here if you want to connect a PhidgetKit USB device from
+	  Phidgets Inc.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called phidgetkit.
+
+config USB_PHIDGETSERVO
+	tristate "USB PhidgetServo support"
+	depends on USB
+	help
+	  Say Y here if you want to connect an 1 or 4 Motor PhidgetServo 
+	  servo controller version 2.0 or 3.0.
+
+	  Phidgets Inc. has a web page at <http://www.phidgets.com/>.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called phidgetservo.
+
+config USB_IDMOUSE
+	tristate "Siemens ID USB Mouse Fingerprint sensor support"
+	depends on USB
+	help
+	  Say Y here if you want to use the fingerprint sensor on
+	  the Siemens ID Mouse. There is also a Siemens ID Mouse
+	  _Professional_, which has not been tested with this driver,
+	  but uses the same sensor and may therefore work.
+
+	  This driver creates an entry "/dev/idmouseX" or "/dev/usb/idmouseX",
+	  which can be used by, e.g.,"cat /dev/idmouse0 > fingerprint.pnm".
+
+	  See also <http://www.fs.tum.de/~echtler/idmouse/>.
+
+source "drivers/usb/misc/sisusbvga/Kconfig"
+
+config USB_TEST
+	tristate "USB testing driver (DEVELOPMENT)"
+	depends on USB && USB_DEVICEFS && EXPERIMENTAL
+	help
+	  This driver is for testing host controller software.  It is used
+	  with specialized device firmware for regression and stress testing,
+	  to help prevent problems from cropping up with "real" drivers.
+
+	  See <http://www.linux-usb.org/usbtest/> for more information,
+	  including sample test device firmware and "how to use it".
+
diff --git a/drivers/usb/misc/Makefile b/drivers/usb/misc/Makefile
new file mode 100644
index 00000000000..4a3814cbd48
--- /dev/null
+++ b/drivers/usb/misc/Makefile
@@ -0,0 +1,20 @@
+#
+# Makefile for the rest of the USB drivers
+# (the ones that don't fit into any other categories)
+#
+
+obj-$(CONFIG_USB_AUERSWALD)	+= auerswald.o
+obj-$(CONFIG_USB_CYTHERM)	+= cytherm.o
+obj-$(CONFIG_USB_EMI26)		+= emi26.o
+obj-$(CONFIG_USB_EMI62)		+= emi62.o
+obj-$(CONFIG_USB_IDMOUSE)	+= idmouse.o
+obj-$(CONFIG_USB_LCD)		+= usblcd.o
+obj-$(CONFIG_USB_LED)		+= usbled.o
+obj-$(CONFIG_USB_LEGOTOWER)	+= legousbtower.o
+obj-$(CONFIG_USB_PHIDGETKIT)	+= phidgetkit.o
+obj-$(CONFIG_USB_PHIDGETSERVO)	+= phidgetservo.o
+obj-$(CONFIG_USB_RIO500)	+= rio500.o
+obj-$(CONFIG_USB_TEST)		+= usbtest.o
+obj-$(CONFIG_USB_USS720)	+= uss720.o
+
+obj-$(CONFIG_USB_SISUSBVGA)	+= sisusbvga/
\ No newline at end of file
diff --git a/drivers/usb/misc/auerswald.c b/drivers/usb/misc/auerswald.c
new file mode 100644
index 00000000000..a530bb976e4
--- /dev/null
+++ b/drivers/usb/misc/auerswald.c
@@ -0,0 +1,2163 @@
+/*****************************************************************************/
+/*
+ *      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>
+#undef DEBUG   		/* include debug macros until it's done	*/
+#include <linux/usb.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 semaphore 	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 semaphore 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 semaphore 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, struct pt_regs *regs);
+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, struct pt_regs *regs)
+{
+	unsigned long flags;
+        int result;
+
+        /* get pointer to element and to chain */
+        pauerchainelement_t acep = (pauerchainelement_t) 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, regs);
+
+        /* 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, NULL);
+                }
+        } 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, NULL);
+                }
+        }
+
+        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
+   URB_ASYNC_UNLINK is set and 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, NULL);
+                        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, NULL);
+                spin_lock_irqsave (&acp->lock, flags);
+        }
+        spin_unlock_irqrestore (&acp->lock, flags);
+
+        /* clear the active urb */
+        acep = acp->active;
+        if (acep) {
+                urbp = acep->urbp;
+                urbp->transfer_flags &= ~URB_ASYNC_UNLINK;
+                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 = (pauerchainelement_t) kmalloc (sizeof (auerchainelement_t), GFP_KERNEL);
+                if (!acep)
+			goto ac_fail;
+		memset (acep, 0, sizeof (auerchainelement_t));
+                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, struct pt_regs *regs)
+{
+	pauerchain_chs_t pchs = (pauerchain_chs_t)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