Linux-2.6.12-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!

5 files changed, 2248 insertions, 0 deletions

diff --git a/drivers/usb/atm/Kconfig b/drivers/usb/atm/Kconfig
new file mode 100644
index 0000000..0d9f537
--- /dev/null
+++ b/drivers/usb/atm/Kconfig
@@ -0,0 +1,30 @@
+#
+# USB ATM driver configuration
+#
+comment "USB ATM/DSL drivers"
+	depends on USB
+
+config USB_ATM
+	tristate "Generic USB ATM/DSL core I/O support"
+	depends on USB && ATM
+	select CRC32
+	default n
+	help
+	  This provides a library which is used for packet I/O by USB DSL
+	  modems, such as the SpeedTouch driver below. 
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called usb_atm.
+
+config USB_SPEEDTOUCH
+	tristate "Alcatel Speedtouch USB support"
+	depends on USB && ATM
+	select USB_ATM
+	help
+	  Say Y here if you have an Alcatel SpeedTouch USB or SpeedTouch 330
+	  modem.  In order to use your modem you will need to install the 
+	  two parts of the firmware, extracted by the user space tools; see
+	  <http://www.linux-usb.org/SpeedTouch/> for details.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called speedtch.
diff --git a/drivers/usb/atm/Makefile b/drivers/usb/atm/Makefile
new file mode 100644
index 0000000..9213b8b9
--- /dev/null
+++ b/drivers/usb/atm/Makefile
@@ -0,0 +1,7 @@
+#
+# Makefile for the rest of the USB drivers
+# (the ones that don't fit into any other categories)
+#
+
+obj-$(CONFIG_USB_ATM)		+= usb_atm.o
+obj-$(CONFIG_USB_SPEEDTOUCH)	+= speedtch.o
diff --git a/drivers/usb/atm/speedtch.c b/drivers/usb/atm/speedtch.c
new file mode 100644
index 0000000..233f922
--- /dev/null
+++ b/drivers/usb/atm/speedtch.c
@@ -0,0 +1,847 @@
+/******************************************************************************
+ *  speedtch.c  -  Alcatel SpeedTouch USB xDSL modem driver
+ *
+ *  Copyright (C) 2001, Alcatel
+ *  Copyright (C) 2003, Duncan Sands
+ *  Copyright (C) 2004, David Woodhouse
+ *
+ *  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., 59
+ *  Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ ******************************************************************************/
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/gfp.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/errno.h>
+#include <linux/proc_fs.h>
+#include <linux/slab.h>
+#include <linux/wait.h>
+#include <linux/list.h>
+#include <asm/processor.h>
+#include <asm/uaccess.h>
+#include <linux/smp_lock.h>
+#include <linux/interrupt.h>
+#include <linux/atm.h>
+#include <linux/atmdev.h>
+#include <linux/crc32.h>
+#include <linux/init.h>
+#include <linux/firmware.h>
+
+#include "usb_atm.h"
+
+#if defined(CONFIG_FW_LOADER) || defined(CONFIG_FW_LOADER_MODULE)
+#	define USE_FW_LOADER
+#endif
+
+#define DRIVER_AUTHOR	"Johan Verrept, Duncan Sands <duncan.sands@free.fr>"
+#define DRIVER_VERSION	"1.8"
+#define DRIVER_DESC	"Alcatel SpeedTouch USB driver version " DRIVER_VERSION
+
+static const char speedtch_driver_name[] = "speedtch";
+
+#define SPEEDTOUCH_VENDORID		0x06b9
+#define SPEEDTOUCH_PRODUCTID		0x4061
+
+/* Timeout in jiffies */
+#define CTRL_TIMEOUT 2000
+#define DATA_TIMEOUT 2000
+
+#define OFFSET_7  0		/* size 1 */
+#define OFFSET_b  1		/* size 8 */
+#define OFFSET_d  9		/* size 4 */
+#define OFFSET_e 13		/* size 1 */
+#define OFFSET_f 14		/* size 1 */
+#define TOTAL    15
+
+#define SIZE_7 1
+#define SIZE_b 8
+#define SIZE_d 4
+#define SIZE_e 1
+#define SIZE_f 1
+
+static int dl_512_first = 0;
+static int sw_buffering = 0;
+
+module_param(dl_512_first, bool, 0444);
+MODULE_PARM_DESC(dl_512_first, "Read 512 bytes before sending firmware");
+
+module_param(sw_buffering, uint, 0444);
+MODULE_PARM_DESC(sw_buffering, "Enable software buffering");
+
+#define UDSL_IOCTL_LINE_UP		1
+#define UDSL_IOCTL_LINE_DOWN		2
+
+#define SPEEDTCH_ENDPOINT_INT		0x81
+#define SPEEDTCH_ENDPOINT_DATA		0x07
+#define SPEEDTCH_ENDPOINT_FIRMWARE	0x05
+
+#define hex2int(c) ( (c >= '0') && (c <= '9') ? (c - '0') : ((c & 0xf) + 9) )
+
+static struct usb_device_id speedtch_usb_ids[] = {
+	{USB_DEVICE(SPEEDTOUCH_VENDORID, SPEEDTOUCH_PRODUCTID)},
+	{}
+};
+
+MODULE_DEVICE_TABLE(usb, speedtch_usb_ids);
+
+struct speedtch_instance_data {
+	struct udsl_instance_data u;
+
+	/* Status */
+	struct urb *int_urb;
+	unsigned char int_data[16];
+	struct work_struct poll_work;
+	struct timer_list poll_timer;
+};
+/* USB */
+
+static int speedtch_usb_probe(struct usb_interface *intf,
+			      const struct usb_device_id *id);
+static void speedtch_usb_disconnect(struct usb_interface *intf);
+static int speedtch_usb_ioctl(struct usb_interface *intf, unsigned int code,
+			      void *user_data);
+static void speedtch_handle_int(struct urb *urb, struct pt_regs *regs);
+static void speedtch_poll_status(struct speedtch_instance_data *instance);
+
+static struct usb_driver speedtch_usb_driver = {
+	.owner		= THIS_MODULE,
+	.name		= speedtch_driver_name,
+	.probe		= speedtch_usb_probe,
+	.disconnect	= speedtch_usb_disconnect,
+	.ioctl		= speedtch_usb_ioctl,
+	.id_table	= speedtch_usb_ids,
+};
+
+/***************
+**  firmware  **
+***************/
+
+static void speedtch_got_firmware(struct speedtch_instance_data *instance,
+				  int got_it)
+{
+	int err;
+	struct usb_interface *intf;
+
+	down(&instance->u.serialize);	/* vs self, speedtch_firmware_start */
+	if (instance->u.status == UDSL_LOADED_FIRMWARE)
+		goto out;
+	if (!got_it) {
+		instance->u.status = UDSL_NO_FIRMWARE;
+		goto out;
+	}
+	if ((err = usb_set_interface(instance->u.usb_dev, 1, 1)) < 0) {
+		dbg("speedtch_got_firmware: usb_set_interface returned %d!", err);
+		instance->u.status = UDSL_NO_FIRMWARE;
+		goto out;
+	}
+
+	/* Set up interrupt endpoint */
+	intf = usb_ifnum_to_if(instance->u.usb_dev, 0);
+	if (intf && !usb_driver_claim_interface(&speedtch_usb_driver, intf, NULL)) {
+
+		instance->int_urb = usb_alloc_urb(0, GFP_KERNEL);
+		if (instance->int_urb) {
+
+			usb_fill_int_urb(instance->int_urb, instance->u.usb_dev,
+					 usb_rcvintpipe(instance->u.usb_dev, SPEEDTCH_ENDPOINT_INT),
+					 instance->int_data,
+					 sizeof(instance->int_data),
+					 speedtch_handle_int, instance, 50);
+			err = usb_submit_urb(instance->int_urb, GFP_KERNEL);
+			if (err) {
+				/* Doesn't matter; we'll poll anyway */
+				dbg("speedtch_got_firmware: Submission of interrupt URB failed %d", err);
+				usb_free_urb(instance->int_urb);
+				instance->int_urb = NULL;
+				usb_driver_release_interface(&speedtch_usb_driver, intf);
+			}
+		}
+	}
+	/* Start status polling */
+	mod_timer(&instance->poll_timer, jiffies + (1 * HZ));
+
+	instance->u.status = UDSL_LOADED_FIRMWARE;
+	tasklet_schedule(&instance->u.receive_tasklet);
+ out:
+	up(&instance->u.serialize);
+	wake_up_interruptible(&instance->u.firmware_waiters);
+}
+
+static int speedtch_set_swbuff(struct speedtch_instance_data *instance,
+			       int state)
+{
+	struct usb_device *dev = instance->u.usb_dev;
+	int ret;
+
+	ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
+			      0x32, 0x40, state ? 0x01 : 0x00,
+			      0x00, NULL, 0, 100);
+	if (ret < 0) {
+		printk("Warning: %sabling SW buffering: usb_control_msg returned %d\n",
+		     state ? "En" : "Dis", ret);
+		return ret;
+	}
+
+	dbg("speedtch_set_swbuff: %sbled SW buffering", state ? "En" : "Dis");
+	return 0;
+}
+
+static void speedtch_test_sequence(struct speedtch_instance_data *instance)
+{
+	struct usb_device *dev = instance->u.usb_dev;
+	unsigned char buf[10];
+	int ret;
+
+	/* URB 147 */
+	buf[0] = 0x1c;
+	buf[1] = 0x50;
+	ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
+			      0x01, 0x40, 0x0b, 0x00, buf, 2, 100);
+	if (ret < 0)
+		printk(KERN_WARNING "%s failed on URB147: %d\n", __func__, ret);
+
+	/* URB 148 */
+	buf[0] = 0x32;
+	buf[1] = 0x00;
+	ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
+			      0x01, 0x40, 0x02, 0x00, buf, 2, 100);
+	if (ret < 0)
+		printk(KERN_WARNING "%s failed on URB148: %d\n", __func__, ret);
+
+	/* URB 149 */
+	buf[0] = 0x01;
+	buf[1] = 0x00;
+	buf[2] = 0x01;
+	ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
+			      0x01, 0x40, 0x03, 0x00, buf, 3, 100);
+	if (ret < 0)
+		printk(KERN_WARNING "%s failed on URB149: %d\n", __func__, ret);
+
+	/* URB 150 */
+	buf[0] = 0x01;
+	buf[1] = 0x00;
+	buf[2] = 0x01;
+	ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
+			      0x01, 0x40, 0x04, 0x00, buf, 3, 100);
+	if (ret < 0)
+		printk(KERN_WARNING "%s failed on URB150: %d\n", __func__, ret);
+}
+
+static int speedtch_start_synchro(struct speedtch_instance_data *instance)
+{
+	struct usb_device *dev = instance->u.usb_dev;
+	unsigned char buf[2];
+	int ret;
+
+	ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
+			      0x12, 0xc0, 0x04, 0x00,
+			      buf, sizeof(buf), CTRL_TIMEOUT);
+	if (ret < 0) {
+		printk(KERN_WARNING "SpeedTouch: Failed to start ADSL synchronisation: %d\n", ret);
+		return ret;
+	}
+
+	dbg("speedtch_start_synchro: modem prodded. %d Bytes returned: %02x %02x", ret, buf[0], buf[1]);
+	return 0;
+}
+
+static void speedtch_handle_int(struct urb *urb, struct pt_regs *regs)
+{
+	struct speedtch_instance_data *instance = urb->context;
+	unsigned int count = urb->actual_length;
+	int ret;
+
+	/* The magic interrupt for "up state" */
+	const static unsigned char up_int[6]   = { 0xa1, 0x00, 0x01, 0x00, 0x00, 0x00 };
+	/* The magic interrupt for "down state" */
+	const static unsigned char down_int[6] = { 0xa1, 0x00, 0x00, 0x00, 0x00, 0x00 };
+
+	switch (urb->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__, urb->status);
+		return;
+	default:
+		dbg("%s - nonzero urb status received: %d", __func__, urb->status);
+		goto exit;
+	}
+
+	if (count < 6) {
+		dbg("%s - int packet too short", __func__);
+		goto exit;
+	}
+
+	if (!memcmp(up_int, instance->int_data, 6)) {
+		del_timer(&instance->poll_timer);
+		printk(KERN_NOTICE "DSL line goes up\n");
+	} else if (!memcmp(down_int, instance->int_data, 6)) {
+		printk(KERN_NOTICE "DSL line goes down\n");
+	} else {
+		int i;
+
+		printk(KERN_DEBUG "Unknown interrupt packet of %d bytes:", count);
+		for (i = 0; i < count; i++)
+			printk(" %02x", instance->int_data[i]);
+		printk("\n");
+	}
+	schedule_work(&instance->poll_work);
+
+ exit:
+	rmb();
+	if (!instance->int_urb)
+		return;
+
+	ret = usb_submit_urb(urb, GFP_ATOMIC);
+	if (ret)
+		err("%s - usb_submit_urb failed with result %d", __func__, ret);
+}
+
+static int speedtch_get_status(struct speedtch_instance_data *instance,
+			       unsigned char *buf)
+{
+	struct usb_device *dev = instance->u.usb_dev;
+	int ret;
+
+	memset(buf, 0, TOTAL);
+
+	ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
+			      0x12, 0xc0, 0x07, 0x00, buf + OFFSET_7, SIZE_7,
+			      CTRL_TIMEOUT);
+	if (ret < 0) {
+		dbg("MSG 7 failed");
+		return ret;
+	}
+
+	ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
+			      0x12, 0xc0, 0x0b, 0x00, buf + OFFSET_b, SIZE_b,
+			      CTRL_TIMEOUT);
+	if (ret < 0) {
+		dbg("MSG B failed");
+		return ret;
+	}
+
+	ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
+			      0x12, 0xc0, 0x0d, 0x00, buf + OFFSET_d, SIZE_d,
+			      CTRL_TIMEOUT);
+	if (ret < 0) {
+		dbg("MSG D failed");
+		return ret;
+	}
+
+	ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
+			      0x01, 0xc0, 0x0e, 0x00, buf + OFFSET_e, SIZE_e,
+			      CTRL_TIMEOUT);
+	if (ret < 0) {
+		dbg("MSG E failed");
+		return ret;
+	}
+
+	ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
+			      0x01, 0xc0, 0x0f, 0x00, buf + OFFSET_f, SIZE_f,
+			      CTRL_TIMEOUT);
+	if (ret < 0) {
+		dbg("MSG F failed");
+		return ret;
+	}
+
+	return 0;
+}
+
+static void speedtch_poll_status(struct speedtch_instance_data *instance)
+{
+	unsigned char buf[TOTAL];
+	int ret;
+
+	ret = speedtch_get_status(instance, buf);
+	if (ret) {
+		printk(KERN_WARNING
+		       "SpeedTouch: Error %d fetching device status\n", ret);
+		return;
+	}
+
+	dbg("Line state %02x", buf[OFFSET_7]);
+
+	switch (buf[OFFSET_7]) {
+	case 0:
+		if (instance->u.atm_dev->signal != ATM_PHY_SIG_LOST) {
+			instance->u.atm_dev->signal = ATM_PHY_SIG_LOST;
+			printk(KERN_NOTICE "ADSL line is down\n");
+		}
+		break;
+
+	case 0x08:
+		if (instance->u.atm_dev->signal != ATM_PHY_SIG_UNKNOWN) {
+			instance->u.atm_dev->signal = ATM_PHY_SIG_UNKNOWN;
+			printk(KERN_NOTICE "ADSL line is blocked?\n");
+		}
+		break;
+
+	case 0x10:
+		if (instance->u.atm_dev->signal != ATM_PHY_SIG_LOST) {
+			instance->u.atm_dev->signal = ATM_PHY_SIG_LOST;
+			printk(KERN_NOTICE "ADSL line is synchronising\n");
+		}
+		break;
+
+	case 0x20:
+		if (instance->u.atm_dev->signal != ATM_PHY_SIG_FOUND) {
+			int down_speed = buf[OFFSET_b] | (buf[OFFSET_b + 1] << 8)
+				| (buf[OFFSET_b + 2] << 16) | (buf[OFFSET_b + 3] << 24);
+			int up_speed = buf[OFFSET_b + 4] | (buf[OFFSET_b + 5] << 8)
+				| (buf[OFFSET_b + 6] << 16) | (buf[OFFSET_b + 7] << 24);
+
+			if (!(down_speed & 0x0000ffff) &&
+			    !(up_speed & 0x0000ffff)) {
+				down_speed >>= 16;
+				up_speed >>= 16;
+			}
+			instance->u.atm_dev->link_rate = down_speed * 1000 / 424;
+			instance->u.atm_dev->signal = ATM_PHY_SIG_FOUND;
+
+			printk(KERN_NOTICE
+			       "ADSL line is up (%d Kib/s down | %d Kib/s up)\n",
+			       down_speed, up_speed);
+		}
+		break;
+
+	default:
+		if (instance->u.atm_dev->signal != ATM_PHY_SIG_UNKNOWN) {
+			instance->u.atm_dev->signal = ATM_PHY_SIG_UNKNOWN;
+			printk(KERN_NOTICE "Unknown line state %02x\n", buf[OFFSET_7]);
+		}
+		break;
+	}
+}
+
+static void speedtch_timer_poll(unsigned long data)
+{
+	struct speedtch_instance_data *instance = (void *)data;
+
+	schedule_work(&instance->poll_work);
+	mod_timer(&instance->poll_timer, jiffies + (5 * HZ));
+}
+
+#ifdef USE_FW_LOADER
+static void speedtch_upload_firmware(struct speedtch_instance_data *instance,
+				     const struct firmware *fw1,
+				     const struct firmware *fw2)
+{
+	unsigned char *buffer;
+	struct usb_device *usb_dev = instance->u.usb_dev;
+	struct usb_interface *intf;
+	int actual_length, ret;
+	int offset;
+
+	dbg("speedtch_upload_firmware");
+
+	if (!(intf = usb_ifnum_to_if(usb_dev, 2))) {
+		dbg("speedtch_upload_firmware: interface not found!");
+		goto fail;
+	}
+
+	if (!(buffer = (unsigned char *)__get_free_page(GFP_KERNEL))) {
+		dbg("speedtch_upload_firmware: no memory for buffer!");
+		goto fail;
+	}
+
+	/* A user-space firmware loader may already have claimed interface #2 */
+	if ((ret =
+	     usb_driver_claim_interface(&speedtch_usb_driver, intf, NULL)) < 0) {
+		dbg("speedtch_upload_firmware: interface in use (%d)!", ret);
+		goto fail_free;
+	}
+
+	/* URB 7 */
+	if (dl_512_first) {	/* some modems need a read before writing the firmware */
+		ret = usb_bulk_msg(usb_dev, usb_rcvbulkpipe(usb_dev, SPEEDTCH_ENDPOINT_FIRMWARE),
+				   buffer, 0x200, &actual_length, 2000);
+
+		if (ret < 0 && ret != -ETIMEDOUT)
+			dbg("speedtch_upload_firmware: read BLOCK0 from modem failed (%d)!", ret);
+		else
+			dbg("speedtch_upload_firmware: BLOCK0 downloaded (%d bytes)", ret);
+	}
+
+	/* URB 8 : both leds are static green */
+	for (offset = 0; offset < fw1->size; offset += PAGE_SIZE) {
+		int thislen = min_t(int, PAGE_SIZE, fw1->size - offset);
+		memcpy(buffer, fw1->data + offset, thislen);
+
+		ret = usb_bulk_msg(usb_dev, usb_sndbulkpipe(usb_dev, SPEEDTCH_ENDPOINT_FIRMWARE),
+				   buffer, thislen, &actual_length, DATA_TIMEOUT);
+
+		if (ret < 0) {
+			dbg("speedtch_upload_firmware: write BLOCK1 to modem failed (%d)!", ret);
+			goto fail_release;
+		}
+		dbg("speedtch_upload_firmware: BLOCK1 uploaded (%zu bytes)", fw1->size);
+	}
+
+	/* USB led blinking green, ADSL led off */
+
+	/* URB 11 */
+	ret = usb_bulk_msg(usb_dev, usb_rcvbulkpipe(usb_dev, SPEEDTCH_ENDPOINT_FIRMWARE),
+			   buffer, 0x200, &actual_length, DATA_TIMEOUT);
+
+	if (ret < 0) {
+		dbg("speedtch_upload_firmware: read BLOCK2 from modem failed (%d)!", ret);
+		goto fail_release;
+	}
+	dbg("speedtch_upload_firmware: BLOCK2 downloaded (%d bytes)", actual_length);
+
+	/* URBs 12 to 139 - USB led blinking green, ADSL led off */
+	for (offset = 0; offset < fw2->size; offset += PAGE_SIZE) {
+		int thislen = min_t(int, PAGE_SIZE, fw2->size - offset);
+		memcpy(buffer, fw2->data + offset, thislen);
+
+		ret = usb_bulk_msg(usb_dev, usb_sndbulkpipe(usb_dev, SPEEDTCH_ENDPOINT_FIRMWARE),
+				   buffer, thislen, &actual_length, DATA_TIMEOUT);
+
+		if (ret < 0) {
+			dbg("speedtch_upload_firmware: write BLOCK3 to modem failed (%d)!", ret);
+			goto fail_release;
+		}
+	}
+	dbg("speedtch_upload_firmware: BLOCK3 uploaded (%zu bytes)", fw2->size);
+
+	/* USB led static green, ADSL led static red */
+
+	/* URB 142 */
+	ret = usb_bulk_msg(usb_dev, usb_rcvbulkpipe(usb_dev, SPEEDTCH_ENDPOINT_FIRMWARE),
+			   buffer, 0x200, &actual_length, DATA_TIMEOUT);
+
+	if (ret < 0) {
+		dbg("speedtch_upload_firmware: read BLOCK4 from modem failed (%d)!", ret);
+		goto fail_release;
+	}
+
+	/* success */
+	dbg("speedtch_upload_firmware: BLOCK4 downloaded (%d bytes)", actual_length);
+
+	/* Delay to allow firmware to start up. We can do this here
+	   because we're in our own kernel thread anyway. */
+	msleep(1000);
+
+	/* Enable software buffering, if requested */
+	if (sw_buffering)
+		speedtch_set_swbuff(instance, 1);
+
+	/* Magic spell; don't ask us what this does */
+	speedtch_test_sequence(instance);
+
+	/* Start modem synchronisation */
+	if (speedtch_start_synchro(instance))
+		dbg("speedtch_start_synchro: failed");
+
+	speedtch_got_firmware(instance, 1);
+
+	free_page((unsigned long)buffer);
+	return;
+
+ fail_release:
+	/* Only release interface #2 if uploading failed; we don't release it
+	   we succeeded.  This prevents the userspace tools from trying to load
+	   the firmware themselves */
+	usb_driver_release_interface(&speedtch_usb_driver, intf);
+ fail_free:
+	free_page((unsigned long)buffer);
+ fail:
+	speedtch_got_firmware(instance, 0);
+}
+
+static int speedtch_find_firmware(struct speedtch_instance_data
+				  *instance, int phase,
+				  const struct firmware **fw_p)
+{
+	char buf[24];
+	const u16 bcdDevice = le16_to_cpu(instance->u.usb_dev->descriptor.bcdDevice);
+	const u8 major_revision = bcdDevice >> 8;
+	const u8 minor_revision = bcdDevice & 0xff;
+
+	sprintf(buf, "speedtch-%d.bin.%x.%02x", phase, major_revision, minor_revision);
+	dbg("speedtch_find_firmware: looking for %s", buf);
+
+	if (request_firmware(fw_p, buf, &instance->u.usb_dev->dev)) {
+		sprintf(buf, "speedtch-%d.bin.%x", phase, major_revision);
+		dbg("speedtch_find_firmware: looking for %s", buf);
+
+		if (request_firmware(fw_p, buf, &instance->u.usb_dev->dev)) {
+			sprintf(buf, "speedtch-%d.bin", phase);
+			dbg("speedtch_find_firmware: looking for %s", buf);
+
+			if (request_firmware(fw_p, buf, &instance->u.usb_dev->dev)) {
+				dev_warn(&instance->u.usb_dev->dev, "no stage %d firmware found!", phase);
+				return -ENOENT;
+			}
+		}
+	}
+
+	dev_info(&instance->u.usb_dev->dev, "found stage %d firmware %s\n", phase, buf);
+
+	return 0;
+}
+
+static int speedtch_load_firmware(void *arg)
+{
+	const struct firmware *fw1, *fw2;
+	struct speedtch_instance_data *instance = arg;
+
+	BUG_ON(!instance);
+
+	daemonize("firmware/speedtch");
+
+	if (!speedtch_find_firmware(instance, 1, &fw1)) {
+		if (!speedtch_find_firmware(instance, 2, &fw2)) {
+			speedtch_upload_firmware(instance, fw1, fw2);
+			release_firmware(fw2);
+		}
+		release_firmware(fw1);
+	}
+
+	/* In case we failed, set state back to NO_FIRMWARE so that
+	   another later attempt may work. Otherwise, we never actually
+	   manage to recover if, for example, the firmware is on /usr and
+	   we look for it too early. */
+	speedtch_got_firmware(instance, 0);
+
+	module_put(THIS_MODULE);
+	udsl_put_instance(&instance->u);
+	return 0;
+}
+#endif /* USE_FW_LOADER */
+
+static void speedtch_firmware_start(struct speedtch_instance_data *instance)
+{
+#ifdef USE_FW_LOADER
+	int ret;
+#endif
+
+	dbg("speedtch_firmware_start");
+
+	down(&instance->u.serialize);	/* vs self, speedtch_got_firmware */
+
+	if (instance->u.status >= UDSL_LOADING_FIRMWARE) {
+		up(&instance->u.serialize);
+		return;
+	}
+
+	instance->u.status = UDSL_LOADING_FIRMWARE;
+	up(&instance->u.serialize);
+
+#ifdef USE_FW_LOADER
+	udsl_get_instance(&instance->u);
+	try_module_get(THIS_MODULE);
+
+	ret = kernel_thread(speedtch_load_firmware, instance,
+			    CLONE_FS | CLONE_FILES);
+
+	if (ret >= 0)
+		return;		/* OK */
+
+	dbg("speedtch_firmware_start: kernel_thread failed (%d)!", ret);
+
+	module_put(THIS_MODULE);
+	udsl_put_instance(&instance->u);
+	/* Just pretend it never happened... hope modem_run happens */
+#endif				/* USE_FW_LOADER */
+
+	speedtch_got_firmware(instance, 0);
+}
+
+static int speedtch_firmware_wait(struct udsl_instance_data *instance)
+{
+	speedtch_firmware_start((void *)instance);
+
+	if (wait_event_interruptible(instance->firmware_waiters, instance->status != UDSL_LOADING_FIRMWARE) < 0)
+		return -ERESTARTSYS;
+
+	return (instance->status == UDSL_LOADED_FIRMWARE) ? 0 : -EAGAIN;
+}
+
+/**********
+**  USB  **
+**********/
+
+static int speedtch_usb_ioctl(struct usb_interface *intf, unsigned int code,
+			      void *user_data)
+{
+	struct speedtch_instance_data *instance = usb_get_intfdata(intf);
+
+	dbg("speedtch_usb_ioctl entered");
+
+	if (!instance) {
+		dbg("speedtch_usb_ioctl: NULL instance!");
+		return -ENODEV;
+	}
+
+	switch (code) {
+	case UDSL_IOCTL_LINE_UP:
+		instance->u.atm_dev->signal = ATM_PHY_SIG_FOUND;
+		speedtch_got_firmware(instance, 1);
+		return (instance->u.status == UDSL_LOADED_FIRMWARE) ? 0 : -EIO;
+	case UDSL_IOCTL_LINE_DOWN:
+		instance->u.atm_dev->signal = ATM_PHY_SIG_LOST;
+		return 0;
+	default:
+		return -ENOTTY;
+	}
+}
+
+static int speedtch_usb_probe(struct usb_interface *intf,
+			      const struct usb_device_id *id)
+{
+	struct usb_device *dev = interface_to_usbdev(intf);
+	int ifnum = intf->altsetting->desc.bInterfaceNumber;
+	struct speedtch_instance_data *instance;
+	unsigned char mac_str[13];
+	int ret, i;
+	char buf7[SIZE_7];
+
+	dbg("speedtch_usb_probe: trying device with vendor=0x%x, product=0x%x, ifnum %d",
+	    le16_to_cpu(dev->descriptor.idVendor),
+	    le16_to_cpu(dev->descriptor.idProduct), ifnum);
+
+	if ((dev->descriptor.bDeviceClass != USB_CLASS_VENDOR_SPEC) || 
+	    (ifnum != 1))
+		return -ENODEV;
+
+	dbg("speedtch_usb_probe: device accepted");
+
+	/* instance init */
+	instance = kmalloc(sizeof(*instance), GFP_KERNEL);
+	if (!instance) {
+		dbg("speedtch_usb_probe: no memory for instance data!");
+		return -ENOMEM;
+	}
+
+	memset(instance, 0, sizeof(struct speedtch_instance_data));
+
+	if ((ret = usb_set_interface(dev, 0, 0)) < 0)
+		goto fail;
+
+	if ((ret = usb_set_interface(dev, 2, 0)) < 0)
+		goto fail;
+
+	instance->u.data_endpoint = SPEEDTCH_ENDPOINT_DATA;
+	instance->u.firmware_wait = speedtch_firmware_wait;
+	instance->u.driver_name = speedtch_driver_name;
+
+	ret = udsl_instance_setup(dev, &instance->u);
+	if (ret)
+		goto fail;
+
+	init_timer(&instance->poll_timer);
+	instance->poll_timer.function = speedtch_timer_poll;
+	instance->poll_timer.data = (unsigned long)instance;
+
+	INIT_WORK(&instance->poll_work, (void *)speedtch_poll_status, instance);
+
+	/* set MAC address, it is stored in the serial number */
+	memset(instance->u.atm_dev->esi, 0, sizeof(instance->u.atm_dev->esi));
+	if (usb_string(dev, dev->descriptor.iSerialNumber, mac_str, sizeof(mac_str)) == 12) {
+		for (i = 0; i < 6; i++)
+			instance->u.atm_dev->esi[i] =
+				(hex2int(mac_str[i * 2]) * 16) + (hex2int(mac_str[i * 2 + 1]));
+	}
+
+	/* First check whether the modem already seems to be alive */
+	ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
+			      0x12, 0xc0, 0x07, 0x00, buf7, SIZE_7, 500);
+
+	if (ret == SIZE_7) {
+		dbg("firmware appears to be already loaded");
+		speedtch_got_firmware(instance, 1);
+		speedtch_poll_status(instance);
+	} else {
+		speedtch_firmware_start(instance);
+	}
+
+	usb_set_intfdata(intf, instance);
+
+	return 0;
+
+ fail:
+	kfree(instance);
+
+	return -ENOMEM;
+}
+
+static void speedtch_usb_disconnect(struct usb_interface *intf)
+{
+	struct speedtch_instance_data *instance = usb_get_intfdata(intf);
+
+	dbg("speedtch_usb_disconnect entered");
+
+	if (!instance) {
+		dbg("speedtch_usb_disconnect: NULL instance!");
+		return;
+	}
+
+/*QQ need to handle disconnects on interface #2 while uploading firmware */
+/*QQ and what about interface #1? */
+
+	if (instance->int_urb) {
+		struct urb *int_urb = instance->int_urb;
+		instance->int_urb = NULL;
+		wmb();
+		usb_unlink_urb(int_urb);
+		usb_free_urb(int_urb);
+	}
+
+	instance->int_data[0] = 1;
+	del_timer_sync(&instance->poll_timer);
+	wmb();
+	flush_scheduled_work();
+
+	udsl_instance_disconnect(&instance->u);
+
+	/* clean up */
+	usb_set_intfdata(intf, NULL);
+	udsl_put_instance(&instance->u);
+}
+
+/***********
+**  init  **
+***********/
+
+static int __init speedtch_usb_init(void)
+{
+	dbg("speedtch_usb_init: driver version " DRIVER_VERSION);
+
+	return usb_register(&speedtch_usb_driver);
+}
+
+static void __exit speedtch_usb_cleanup(void)
+{
+	dbg("speedtch_usb_cleanup entered");
+
+	usb_deregister(&speedtch_usb_driver);
+}
+
+module_init(speedtch_usb_init);
+module_exit(speedtch_usb_cleanup);
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRIVER_VERSION);
diff --git a/drivers/usb/atm/usb_atm.c b/drivers/usb/atm/usb_atm.c
new file mode 100644
index 0000000..a4cd447
--- /dev/null
+++ b/drivers/usb/atm/usb_atm.c
@@ -0,0 +1,1188 @@
+/******************************************************************************
+ *  usb_atm.c - Generic USB xDSL driver core
+ *
+ *  Copyright (C) 2001, Alcatel
+ *  Copyright (C) 2003, Duncan Sands, SolNegro, Josep Comas
+ *  Copyright (C) 2004, David Woodhouse
+ *
+ *  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., 59
+ *  Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ ******************************************************************************/
+
+/*
+ *  Written by Johan Verrept, maintained by Duncan Sands (duncan.sands@free.fr)
+ *
+ *  1.7+:	- See the check-in logs
+ *
+ *  1.6:	- No longer opens a connection if the firmware is not loaded
+ *  		- Added support for the speedtouch 330
+ *  		- Removed the limit on the number of devices
+ *  		- Module now autoloads on device plugin
+ *  		- Merged relevant parts of sarlib
+ *  		- Replaced the kernel thread with a tasklet
+ *  		- New packet transmission code
+ *  		- Changed proc file contents
+ *  		- Fixed all known SMP races
+ *  		- Many fixes and cleanups
+ *  		- Various fixes by Oliver Neukum (oliver@neukum.name)
+ *
+ *  1.5A:	- Version for inclusion in 2.5 series kernel
+ *		- Modifications by Richard Purdie (rpurdie@rpsys.net)
+ *		- made compatible with kernel 2.5.6 onwards by changing
+ *		udsl_usb_send_data_context->urb to a pointer and adding code
+ *		to alloc and free it
+ *		- remove_wait_queue() added to udsl_atm_processqueue_thread()
+ *
+ *  1.5:	- fixed memory leak when atmsar_decode_aal5 returned NULL.
+ *		(reported by stephen.robinson@zen.co.uk)
+ *
+ *  1.4:	- changed the spin_lock() under interrupt to spin_lock_irqsave()
+ *		- unlink all active send urbs of a vcc that is being closed.
+ *
+ *  1.3.1:	- added the version number
+ *
+ *  1.3:	- Added multiple send urb support
+ *		- fixed memory leak and vcc->tx_inuse starvation bug
+ *		  when not enough memory left in vcc.
+ *
+ *  1.2:	- Fixed race condition in udsl_usb_send_data()
+ *  1.1:	- Turned off packet debugging
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/errno.h>
+#include <linux/proc_fs.h>
+#include <linux/slab.h>
+#include <linux/wait.h>
+#include <linux/list.h>
+#include <asm/uaccess.h>
+#include <linux/smp_lock.h>
+#include <linux/interrupt.h>
+#include <linux/atm.h>
+#include <linux/atmdev.h>
+#include <linux/crc32.h>
+#include <linux/init.h>
+#include <linux/firmware.h>
+
+#include "usb_atm.h"
+
+#ifdef VERBOSE_DEBUG
+static int udsl_print_packet(const unsigned char *data, int len);
+#define PACKETDEBUG(arg...)	udsl_print_packet (arg)
+#define vdbg(arg...)		dbg (arg)
+#else
+#define PACKETDEBUG(arg...)
+#define vdbg(arg...)
+#endif
+
+#define DRIVER_AUTHOR	"Johan Verrept, Duncan Sands <duncan.sands@free.fr>"
+#define DRIVER_VERSION	"1.8"
+#define DRIVER_DESC	"Generic USB ATM/DSL I/O, version " DRIVER_VERSION
+
+static unsigned int num_rcv_urbs = UDSL_DEFAULT_RCV_URBS;
+static unsigned int num_snd_urbs = UDSL_DEFAULT_SND_URBS;
+static unsigned int num_rcv_bufs = UDSL_DEFAULT_RCV_BUFS;
+static unsigned int num_snd_bufs = UDSL_DEFAULT_SND_BUFS;
+static unsigned int rcv_buf_size = UDSL_DEFAULT_RCV_BUF_SIZE;
+static unsigned int snd_buf_size = UDSL_DEFAULT_SND_BUF_SIZE;
+
+module_param(num_rcv_urbs, uint, 0444);
+MODULE_PARM_DESC(num_rcv_urbs,
+		 "Number of urbs used for reception (range: 0-"
+		 __MODULE_STRING(UDSL_MAX_RCV_URBS) ", default: "
+		 __MODULE_STRING(UDSL_DEFAULT_RCV_URBS) ")");
+
+module_param(num_snd_urbs, uint, 0444);
+MODULE_PARM_DESC(num_snd_urbs,
+		 "Number of urbs used for transmission (range: 0-"
+		 __MODULE_STRING(UDSL_MAX_SND_URBS) ", default: "
+		 __MODULE_STRING(UDSL_DEFAULT_SND_URBS) ")");
+
+module_param(num_rcv_bufs, uint, 0444);
+MODULE_PARM_DESC(num_rcv_bufs,
+		 "Number of buffers used for reception (range: 0-"
+		 __MODULE_STRING(UDSL_MAX_RCV_BUFS) ", default: "
+		 __MODULE_STRING(UDSL_DEFAULT_RCV_BUFS) ")");
+
+module_param(num_snd_bufs, uint, 0444);
+MODULE_PARM_DESC(num_snd_bufs,
+		 "Number of buffers used for transmission (range: 0-"
+		 __MODULE_STRING(UDSL_MAX_SND_BUFS) ", default: "
+		 __MODULE_STRING(UDSL_DEFAULT_SND_BUFS) ")");
+
+module_param(rcv_buf_size, uint, 0444);
+MODULE_PARM_DESC(rcv_buf_size,
+		 "Size of the buffers used for reception (range: 0-"
+		 __MODULE_STRING(UDSL_MAX_RCV_BUF_SIZE) ", default: "
+		 __MODULE_STRING(UDSL_DEFAULT_RCV_BUF_SIZE) ")");
+
+module_param(snd_buf_size, uint, 0444);
+MODULE_PARM_DESC(snd_buf_size,
+		 "Size of the buffers used for transmission (range: 0-"
+		 __MODULE_STRING(UDSL_MAX_SND_BUF_SIZE) ", default: "
+		 __MODULE_STRING(UDSL_DEFAULT_SND_BUF_SIZE) ")");
+
+/* ATM */
+
+static void udsl_atm_dev_close(struct atm_dev *dev);
+static int udsl_atm_open(struct atm_vcc *vcc);
+static void udsl_atm_close(struct atm_vcc *vcc);
+static int udsl_atm_ioctl(struct atm_dev *dev, unsigned int cmd, void __user * arg);
+static int udsl_atm_send(struct atm_vcc *vcc, struct sk_buff *skb);
+static int udsl_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page);
+
+static struct atmdev_ops udsl_atm_devops = {
+	.dev_close	= udsl_atm_dev_close,
+	.open		= udsl_atm_open,
+	.close		= udsl_atm_close,
+	.ioctl		= udsl_atm_ioctl,
+	.send		= udsl_atm_send,
+	.proc_read	= udsl_atm_proc_read,
+	.owner		= THIS_MODULE,
+};
+
+/***********
+**  misc  **
+***********/
+
+static inline void udsl_pop(struct atm_vcc *vcc, struct sk_buff *skb)
+{
+	if (vcc->pop)
+		vcc->pop(vcc, skb);
+	else
+		dev_kfree_skb(skb);
+}
+
+/*************
+**  decode  **
+*************/
+
+static inline struct udsl_vcc_data *udsl_find_vcc(struct udsl_instance_data *instance,
+						  short vpi, int vci)
+{
+	struct udsl_vcc_data *vcc;
+
+	list_for_each_entry(vcc, &instance->vcc_list, list)
+		if ((vcc->vci == vci) && (vcc->vpi == vpi))
+			return vcc;
+	return NULL;
+}
+
+static void udsl_extract_cells(struct udsl_instance_data *instance,
+			       unsigned char *source, unsigned int howmany)
+{
+	struct udsl_vcc_data *cached_vcc = NULL;
+	struct atm_vcc *vcc;
+	struct sk_buff *sarb;
+	struct udsl_vcc_data *vcc_data;
+	int cached_vci = 0;
+	unsigned int i;
+	int pti;
+	int vci;
+	short cached_vpi = 0;
+	short vpi;
+
+	for (i = 0; i < howmany;
+	     i++, source += ATM_CELL_SIZE + instance->rcv_padding) {
+		vpi = ((source[0] & 0x0f) << 4) | (source[1] >> 4);
+		vci = ((source[1] & 0x0f) << 12) | (source[2] << 4) | (source[3] >> 4);
+		pti = (source[3] & 0x2) != 0;
+
+		vdbg("udsl_extract_cells: vpi %hd, vci %d, pti %d", vpi, vci, pti);
+
+		if (cached_vcc && (vci == cached_vci) && (vpi == cached_vpi))
+			vcc_data = cached_vcc;
+		else if ((vcc_data = udsl_find_vcc(instance, vpi, vci))) {
+			cached_vcc = vcc_data;
+			cached_vpi = vpi;
+			cached_vci = vci;
+		} else {
+			dbg("udsl_extract_cells: unknown vpi/vci (%hd/%d)!", vpi, vci);
+			continue;
+		}
+
+		vcc = vcc_data->vcc;
+		sarb = vcc_data->sarb;
+
+		if (sarb->tail + ATM_CELL_PAYLOAD > sarb->end) {
+			dbg("udsl_extract_cells: buffer overrun (sarb->len %u, vcc: 0x%p)!", sarb->len, vcc);
+			/* discard cells already received */
+			skb_trim(sarb, 0);
+		}
+
+		memcpy(sarb->tail, source + ATM_CELL_HEADER, ATM_CELL_PAYLOAD);
+		__skb_put(sarb, ATM_CELL_PAYLOAD);
+
+		if (pti) {
+			struct sk_buff *skb;
+			unsigned int length;
+			unsigned int pdu_length;
+
+			length = (source[ATM_CELL_SIZE - 6] << 8) + source[ATM_CELL_SIZE - 5];
+
+			/* guard against overflow */
+			if (length > ATM_MAX_AAL5_PDU) {
+				dbg("udsl_extract_cells: bogus length %u (vcc: 0x%p)!", length, vcc);
+				atomic_inc(&vcc->stats->rx_err);
+				goto out;
+			}
+
+			pdu_length = UDSL_NUM_CELLS(length) * ATM_CELL_PAYLOAD;
+
+			if (sarb->len < pdu_length) {
+				dbg("udsl_extract_cells: bogus pdu_length %u (sarb->len: %u, vcc: 0x%p)!", pdu_length, sarb->len, vcc);
+				atomic_inc(&vcc->stats->rx_err);
+				goto out;
+			}
+
+			if (crc32_be(~0, sarb->tail - pdu_length, pdu_length) != 0xc704dd7b) {
+				dbg("udsl_extract_cells: packet failed crc check (vcc: 0x%p)!", vcc);
+				atomic_inc(&vcc->stats->rx_err);
+				goto out;
+			}
+
+			vdbg("udsl_extract_cells: got packet (length: %u, pdu_length: %u, vcc: 0x%p)", length, pdu_length, vcc);
+
+			if (!(skb = dev_alloc_skb(length))) {
+				dbg("udsl_extract_cells: no memory for skb (length: %u)!", length);
+				atomic_inc(&vcc->stats->rx_drop);
+				goto out;
+			}
+
+			vdbg("udsl_extract_cells: allocated new sk_buff (skb: 0x%p, skb->truesize: %u)", skb, skb->truesize);
+
+			if (!atm_charge(vcc, skb->truesize)) {
+				dbg("udsl_extract_cells: failed atm_charge (skb->truesize: %u)!", skb->truesize);
+				dev_kfree_skb(skb);
+				goto out;	/* atm_charge increments rx_drop */
+			}
+
+			memcpy(skb->data, sarb->tail - pdu_length, length);
+			__skb_put(skb, length);
+
+			vdbg("udsl_extract_cells: sending skb 0x%p, skb->len %u, skb->truesize %u", skb, skb->len, skb->truesize);
+
+			PACKETDEBUG(skb->data, skb->len);
+
+			vcc->push(vcc, skb);
+
+			atomic_inc(&vcc->stats->rx);
+		out:
+			skb_trim(sarb, 0);
+		}
+	}
+}
+
+/*************
+**  encode  **
+*************/
+
+static inline void udsl_fill_cell_header(unsigned char *target, struct atm_vcc *vcc)
+{
+	target[0] = vcc->vpi >> 4;
+	target[1] = (vcc->vpi << 4) | (vcc->vci >> 12);
+	target[2] = vcc->vci >> 4;
+	target[3] = vcc->vci << 4;
+	target[4] = 0xec;
+}
+
+static const unsigned char zeros[ATM_CELL_PAYLOAD];
+
+static void udsl_groom_skb(struct atm_vcc *vcc, struct sk_buff *skb)
+{
+	struct udsl_control *ctrl = UDSL_SKB(skb);
+	unsigned int zero_padding;
+	u32 crc;
+
+	ctrl->atm_data.vcc = vcc;
+
+	ctrl->num_cells = UDSL_NUM_CELLS(skb->len);
+	ctrl->num_entire = skb->len / ATM_CELL_PAYLOAD;
+
+	zero_padding = ctrl->num_cells * ATM_CELL_PAYLOAD - skb->len - ATM_AAL5_TRAILER;
+
+	if (ctrl->num_entire + 1 < ctrl->num_cells)
+		ctrl->pdu_padding = zero_padding - (ATM_CELL_PAYLOAD - ATM_AAL5_TRAILER);
+	else
+		ctrl->pdu_padding = zero_padding;
+
+	ctrl->aal5_trailer[0] = 0;	/* UU = 0 */
+	ctrl->aal5_trailer[1] = 0;	/* CPI = 0 */
+	ctrl->aal5_trailer[2] = skb->len >> 8;
+	ctrl->aal5_trailer[3] = skb->len;
+
+	crc = crc32_be(~0, skb->data, skb->len);
+	crc = crc32_be(crc, zeros, zero_padding);
+	crc = crc32_be(crc, ctrl->aal5_trailer, 4);
+	crc = ~crc;
+
+	ctrl->aal5_trailer[4] = crc >> 24;
+	ctrl->aal5_trailer[5] = crc >> 16;
+	ctrl->aal5_trailer[6] = crc >> 8;
+	ctrl->aal5_trailer[7] = crc;
+}
+
+static unsigned int udsl_write_cells(struct udsl_instance_data *instance,
+				     unsigned int howmany, struct sk_buff *skb,
+				     unsigned char **target_p)
+{
+	struct udsl_control *ctrl = UDSL_SKB(skb);
+	unsigned char *target = *target_p;
+	unsigned int nc, ne, i;
+
+	vdbg("udsl_write_cells: howmany=%u, skb->len=%d, num_cells=%u, num_entire=%u, pdu_padding=%u", howmany, skb->len, ctrl->num_cells, ctrl->num_entire, ctrl->pdu_padding);
+
+	nc = ctrl->num_cells;
+	ne = min(howmany, ctrl->num_entire);
+
+	for (i = 0; i < ne; i++) {
+		udsl_fill_cell_header(target, ctrl->atm_data.vcc);
+		target += ATM_CELL_HEADER;
+		memcpy(target, skb->data, ATM_CELL_PAYLOAD);
+		target += ATM_CELL_PAYLOAD;
+		if (instance->snd_padding) {
+			memset(target, 0, instance->snd_padding);
+			target += instance->snd_padding;
+		}
+		__skb_pull(skb, ATM_CELL_PAYLOAD);
+	}
+
+	ctrl->num_entire -= ne;
+
+	if (!(ctrl->num_cells -= ne) || !(howmany -= ne))
+		goto out;
+
+	udsl_fill_cell_header(target, ctrl->atm_data.vcc);
+	target += ATM_CELL_HEADER;
+	memcpy(target, skb->data, skb->len);
+	target += skb->len;
+	__skb_pull(skb, skb->len);
+	memset(target, 0, ctrl->pdu_padding);
+	target += ctrl->pdu_padding;
+
+	if (--ctrl->num_cells) {
+		if (!--howmany) {
+			ctrl->pdu_padding = ATM_CELL_PAYLOAD - ATM_AAL5_TRAILER;
+			goto out;
+		}
+
+		if (instance->snd_padding) {
+			memset(target, 0, instance->snd_padding);
+			target += instance->snd_padding;
+		}
+		udsl_fill_cell_header(target, ctrl->atm_data.vcc);
+		target += ATM_CELL_HEADER;
+		memset(target, 0, ATM_CELL_PAYLOAD - ATM_AAL5_TRAILER);
+		target += ATM_CELL_PAYLOAD - ATM_AAL5_TRAILER;
+
+		--ctrl->num_cells;
+		UDSL_ASSERT(!ctrl->num_cells);
+	}
+
+	memcpy(target, ctrl->aal5_trailer, ATM_AAL5_TRAILER);
+	target += ATM_AAL5_TRAILER;
+	/* set pti bit in last cell */
+	*(target + 3 - ATM_CELL_SIZE) |= 0x2;
+	if (instance->snd_padding) {
+		memset(target, 0, instance->snd_padding);
+		target += instance->snd_padding;
+	}
+ out:
+	*target_p = target;
+	return nc - ctrl->num_cells;
+}
+
+/**************
+**  receive  **
+**************/
+
+static void udsl_complete_receive(struct urb *urb, struct pt_regs *regs)
+{
+	struct udsl_receive_buffer *buf;
+	struct udsl_instance_data *instance;
+	struct udsl_receiver *rcv;
+	unsigned long flags;
+
+	if (!urb || !(rcv = urb->context)) {
+		dbg("udsl_complete_receive: bad urb!");
+		return;
+	}
+
+	instance = rcv->instance;
+	buf = rcv->buffer;
+
+	buf->filled_cells = urb->actual_length / (ATM_CELL_SIZE + instance->rcv_padding);
+
+	vdbg("udsl_complete_receive: urb 0x%p, status %d, actual_length %d, filled_cells %u, rcv 0x%p, buf 0x%p", urb, urb->status, urb->actual_length, buf->filled_cells, rcv, buf);
+
+	UDSL_ASSERT(buf->filled_cells <= rcv_buf_size);
+
+	/* may not be in_interrupt() */
+	spin_lock_irqsave(&instance->receive_lock, flags);
+	list_add(&rcv->list, &instance->spare_receivers);
+	list_add_tail(&buf->list, &instance->filled_receive_buffers);
+	if (likely(!urb->status))
+		tasklet_schedule(&instance->receive_tasklet);
+	spin_unlock_irqrestore(&instance->receive_lock, flags);
+}
+
+static void udsl_process_receive(unsigned long data)
+{
+	struct udsl_receive_buffer *buf;
+	struct udsl_instance_data *instance = (struct udsl_instance_data *)data;
+	struct udsl_receiver *rcv;
+	int err;
+
+ made_progress:
+	while (!list_empty(&instance->spare_receive_buffers)) {
+		spin_lock_irq(&instance->receive_lock);
+		if (list_empty(&instance->spare_receivers)) {
+			spin_unlock_irq(&instance->receive_lock);
+			break;
+		}
+		rcv = list_entry(instance->spare_receivers.next,
+				 struct udsl_receiver, list);
+		list_del(&rcv->list);
+		spin_unlock_irq(&instance->receive_lock);
+
+		buf = list_entry(instance->spare_receive_buffers.next,
+				 struct udsl_receive_buffer, list);
+		list_del(&buf->list);
+
+		rcv->buffer = buf;
+
+		usb_fill_bulk_urb(rcv->urb, instance->usb_dev,
+				  usb_rcvbulkpipe(instance->usb_dev, instance->data_endpoint),
+				  buf->base,
+				  rcv_buf_size * (ATM_CELL_SIZE + instance->rcv_padding),
+				  udsl_complete_receive, rcv);
+
+		vdbg("udsl_process_receive: sending urb 0x%p, rcv 0x%p, buf 0x%p",
+		     rcv->urb, rcv, buf);
+
+		if ((err = usb_submit_urb(rcv->urb, GFP_ATOMIC)) < 0) {
+			dbg("udsl_process_receive: urb submission failed (%d)!", err);
+			list_add(&buf->list, &instance->spare_receive_buffers);
+			spin_lock_irq(&instance->receive_lock);
+			list_add(&rcv->list, &instance->spare_receivers);
+			spin_unlock_irq(&instance->receive_lock);
+			break;
+		}
+	}
+
+	spin_lock_irq(&instance->receive_lock);
+	if (list_empty(&instance->filled_receive_buffers)) {
+		spin_unlock_irq(&instance->receive_lock);
+		return;		/* done - no more buffers */
+	}
+	buf = list_entry(instance->filled_receive_buffers.next,
+			 struct udsl_receive_buffer, list);
+	list_del(&buf->list);
+	spin_unlock_irq(&instance->receive_lock);
+
+	vdbg("udsl_process_receive: processing buf 0x%p", buf);
+	udsl_extract_cells(instance, buf->base, buf->filled_cells);
+	list_add(&buf->list, &instance->spare_receive_buffers);
+	goto made_progress;
+}
+
+/***********
+**  send  **
+***********/
+
+static void udsl_complete_send(struct urb *urb, struct pt_regs *regs)
+{
+	struct udsl_instance_data *instance;
+	struct udsl_sender *snd;
+	unsigned long flags;
+
+	if (!urb || !(snd = urb->context) || !(instance = snd->instance)) {
+		dbg("udsl_complete_send: bad urb!");
+		return;
+	}
+
+	vdbg("udsl_complete_send: urb 0x%p, status %d, snd 0x%p, buf 0x%p", urb,
+	     urb->status, snd, snd->buffer);
+
+	/* may not be in_interrupt() */
+	spin_lock_irqsave(&instance->send_lock, flags);
+	list_add(&snd->list, &instance->spare_senders);
+	list_add(&snd->buffer->list, &instance->spare_send_buffers);
+	tasklet_schedule(&instance->send_tasklet);
+	spin_unlock_irqrestore(&instance->send_lock, flags);
+}
+
+static void udsl_process_send(unsigned long data)
+{
+	struct udsl_send_buffer *buf;
+	struct udsl_instance_data *instance = (struct udsl_instance_data *)data;
+	struct sk_buff *skb;
+	struct udsl_sender *snd;
+	int err;
+	unsigned int num_written;
+
+ made_progress:
+	spin_lock_irq(&instance->send_lock);
+	while (!list_empty(&instance->spare_senders)) {
+		if (!list_empty(&instance->filled_send_buffers)) {
+			buf = list_entry(instance->filled_send_buffers.next,
+					 struct udsl_send_buffer, list);
+			list_del(&buf->list);
+		} else if ((buf = instance->current_buffer)) {
+			instance->current_buffer = NULL;
+		} else		/* all buffers empty */
+			break;
+
+		snd = list_entry(instance->spare_senders.next,
+				 struct udsl_sender, list);
+		list_del(&snd->list);
+		spin_unlock_irq(&instance->send_lock);
+
+		snd->buffer = buf;
+		usb_fill_bulk_urb(snd->urb, instance->usb_dev,
+				  usb_sndbulkpipe(instance->usb_dev, instance->data_endpoint),
+				  buf->base,
+				  (snd_buf_size - buf->free_cells) * (ATM_CELL_SIZE + instance->snd_padding),
+				  udsl_complete_send, snd);
+
+		vdbg("udsl_process_send: submitting urb 0x%p (%d cells), snd 0x%p, buf 0x%p",
+		     snd->urb, snd_buf_size - buf->free_cells, snd, buf);
+
+		if ((err = usb_submit_urb(snd->urb, GFP_ATOMIC)) < 0) {
+			dbg("udsl_process_send: urb submission failed (%d)!", err);
+			spin_lock_irq(&instance->send_lock);
+			list_add(&snd->list, &instance->spare_senders);
+			spin_unlock_irq(&instance->send_lock);
+			list_add(&buf->list, &instance->filled_send_buffers);
+			return;	/* bail out */
+		}
+
+		spin_lock_irq(&instance->send_lock);
+	}			/* while */
+	spin_unlock_irq(&instance->send_lock);
+
+	if (!instance->current_skb)
+		instance->current_skb = skb_dequeue(&instance->sndqueue);
+	if (!instance->current_skb)
+		return;		/* done - no more skbs */
+
+	skb = instance->current_skb;
+
+	if (!(buf = instance->current_buffer)) {
+		spin_lock_irq(&instance->send_lock);
+		if (list_empty(&instance->spare_send_buffers)) {
+			instance->current_buffer = NULL;
+			spin_unlock_irq(&instance->send_lock);
+			return;	/* done - no more buffers */
+		}
+		buf = list_entry(instance->spare_send_buffers.next,
+			       struct udsl_send_buffer, list);
+		list_del(&buf->list);
+		spin_unlock_irq(&instance->send_lock);
+
+		buf->free_start = buf->base;
+		buf->free_cells = snd_buf_size;
+
+		instance->current_buffer = buf;
+	}
+
+	num_written = udsl_write_cells(instance, buf->free_cells, skb, &buf->free_start);
+
+	vdbg("udsl_process_send: wrote %u cells from skb 0x%p to buffer 0x%p",
+	     num_written, skb, buf);
+
+	if (!(buf->free_cells -= num_written)) {
+		list_add_tail(&buf->list, &instance->filled_send_buffers);
+		instance->current_buffer = NULL;
+	}
+
+	vdbg("udsl_process_send: buffer contains %d cells, %d left",
+	     snd_buf_size - buf->free_cells, buf->free_cells);
+
+	if (!UDSL_SKB(skb)->num_cells) {
+		struct atm_vcc *vcc = UDSL_SKB(skb)->atm_data.vcc;
+
+		udsl_pop(vcc, skb);
+		instance->current_skb = NULL;
+
+		atomic_inc(&vcc->stats->tx);
+	}
+
+	goto made_progress;
+}
+
+static void udsl_cancel_send(struct udsl_instance_data *instance,
+			     struct atm_vcc *vcc)
+{
+	struct sk_buff *skb, *n;
+
+	dbg("udsl_cancel_send entered");
+	spin_lock_irq(&instance->sndqueue.lock);
+	for (skb = instance->sndqueue.next, n = skb->next;
+	     skb != (struct sk_buff *)&instance->sndqueue;
+	     skb = n, n = skb->next)
+		if (UDSL_SKB(skb)->atm_data.vcc == vcc) {
+			dbg("udsl_cancel_send: popping skb 0x%p", skb);
+			__skb_unlink(skb, &instance->sndqueue);
+			udsl_pop(vcc, skb);
+		}
+	spin_unlock_irq(&instance->sndqueue.lock);
+
+	tasklet_disable(&instance->send_tasklet);
+	if ((skb = instance->current_skb) && (UDSL_SKB(skb)->atm_data.vcc == vcc)) {
+		dbg("udsl_cancel_send: popping current skb (0x%p)", skb);
+		instance->current_skb = NULL;
+		udsl_pop(vcc, skb);
+	}
+	tasklet_enable(&instance->send_tasklet);
+	dbg("udsl_cancel_send done");
+}
+
+static int udsl_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
+{
+	struct udsl_instance_data *instance = vcc->dev->dev_data;
+	int err;
+
+	vdbg("udsl_atm_send called (skb 0x%p, len %u)", skb, skb->len);
+
+	if (!instance) {
+		dbg("udsl_atm_send: NULL data!");
+		err = -ENODEV;
+		goto fail;
+	}
+
+	if (vcc->qos.aal != ATM_AAL5) {
+		dbg("udsl_atm_send: unsupported ATM type %d!", vcc->qos.aal);
+		err = -EINVAL;
+		goto fail;
+	}
+
+	if (skb->len > ATM_MAX_AAL5_PDU) {
+		dbg("udsl_atm_send: packet too long (%d vs %d)!", skb->len,
+		    ATM_MAX_AAL5_PDU);
+		err = -EINVAL;
+		goto fail;
+	}
+
+	PACKETDEBUG(skb->data, skb->len);
+
+	udsl_groom_skb(vcc, skb);
+	skb_queue_tail(&instance->sndqueue, skb);
+	tasklet_schedule(&instance->send_tasklet);
+
+	return 0;
+
+ fail:
+	udsl_pop(vcc, skb);
+	return err;
+}
+
+/********************
+**  bean counting  **
+********************/
+
+static void udsl_destroy_instance(struct kref *kref)
+{
+	struct udsl_instance_data *instance =
+	    container_of(kref, struct udsl_instance_data, refcount);
+
+	tasklet_kill(&instance->receive_tasklet);
+	tasklet_kill(&instance->send_tasklet);
+	usb_put_dev(instance->usb_dev);
+	kfree(instance);
+}
+
+void udsl_get_instance(struct udsl_instance_data *instance)
+{
+	kref_get(&instance->refcount);
+}
+
+void udsl_put_instance(struct udsl_instance_data *instance)
+{
+	kref_put(&instance->refcount, udsl_destroy_instance);
+}
+
+/**********
+**  ATM  **
+**********/
+
+static void udsl_atm_dev_close(struct atm_dev *dev)
+{
+	struct udsl_instance_data *instance = dev->dev_data;
+
+	dev->dev_data = NULL;
+	udsl_put_instance(instance);
+}
+
+static int udsl_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page)
+{
+	struct udsl_instance_data *instance = atm_dev->dev_data;
+	int left = *pos;
+
+	if (!instance) {
+		dbg("udsl_atm_proc_read: NULL instance!");
+		return -ENODEV;
+	}
+
+	if (!left--)
+		return sprintf(page, "%s\n", instance->description);
+
+	if (!left--)
+		return sprintf(page, "MAC: %02x:%02x:%02x:%02x:%02x:%02x\n",
+			       atm_dev->esi[0], atm_dev->esi[1],
+			       atm_dev->esi[2], atm_dev->esi[3],
+			       atm_dev->esi[4], atm_dev->esi[5]);
+
+	if (!left--)
+		return sprintf(page,
+			       "AAL5: tx %d ( %d err ), rx %d ( %d err, %d drop )\n",
+			       atomic_read(&atm_dev->stats.aal5.tx),
+			       atomic_read(&atm_dev->stats.aal5.tx_err),
+			       atomic_read(&atm_dev->stats.aal5.rx),
+			       atomic_read(&atm_dev->stats.aal5.rx_err),
+			       atomic_read(&atm_dev->stats.aal5.rx_drop));
+
+	if (!left--) {
+		switch (atm_dev->signal) {
+		case ATM_PHY_SIG_FOUND:
+			sprintf(page, "Line up");
+			break;
+		case ATM_PHY_SIG_LOST:
+			sprintf(page, "Line down");
+			break;
+		default:
+			sprintf(page, "Line state unknown");
+			break;
+		}
+
+		if (instance->usb_dev->state == USB_STATE_NOTATTACHED)
+			strcat(page, ", disconnected\n");
+		else {
+			if (instance->status == UDSL_LOADED_FIRMWARE)
+				strcat(page, ", firmware loaded\n");
+			else if (instance->status == UDSL_LOADING_FIRMWARE)
+				strcat(page, ", firmware loading\n");
+			else
+				strcat(page, ", no firmware\n");
+		}
+
+		return strlen(page);
+	}
+
+	return 0;
+}
+
+static int udsl_atm_open(struct atm_vcc *vcc)
+{
+	struct udsl_instance_data *instance = vcc->dev->dev_data;
+	struct udsl_vcc_data *new;
+	unsigned int max_pdu;
+	int vci = vcc->vci;
+	short vpi = vcc->vpi;
+	int err;
+
+	dbg("udsl_atm_open: vpi %hd, vci %d", vpi, vci);
+
+	if (!instance) {
+		dbg("udsl_atm_open: NULL data!");
+		return -ENODEV;
+	}
+
+	/* only support AAL5 */
+	if ((vcc->qos.aal != ATM_AAL5) || (vcc->qos.rxtp.max_sdu < 0)
+	    || (vcc->qos.rxtp.max_sdu > ATM_MAX_AAL5_PDU)) {
+		dbg("udsl_atm_open: unsupported ATM type %d!", vcc->qos.aal);
+		return -EINVAL;
+	}
+
+	if (instance->firmware_wait &&
+	    (err = instance->firmware_wait(instance)) < 0) {
+		dbg("udsl_atm_open: firmware not loaded (%d)!", err);
+		return err;
+	}
+
+	down(&instance->serialize);	/* vs self, udsl_atm_close */
+
+	if (udsl_find_vcc(instance, vpi, vci)) {
+		dbg("udsl_atm_open: %hd/%d already in use!", vpi, vci);
+		up(&instance->serialize);
+		return -EADDRINUSE;
+	}
+
+	if (!(new = kmalloc(sizeof(struct udsl_vcc_data), GFP_KERNEL))) {
+		dbg("udsl_atm_open: no memory for vcc_data!");
+		up(&instance->serialize);
+		return -ENOMEM;
+	}
+
+	memset(new, 0, sizeof(struct udsl_vcc_data));
+	new->vcc = vcc;
+	new->vpi = vpi;
+	new->vci = vci;
+
+	/* udsl_extract_cells requires at least one cell */
+	max_pdu = max(1, UDSL_NUM_CELLS(vcc->qos.rxtp.max_sdu)) * ATM_CELL_PAYLOAD;
+	if (!(new->sarb = alloc_skb(max_pdu, GFP_KERNEL))) {
+		dbg("udsl_atm_open: no memory for SAR buffer!");
+		kfree(new);
+		up(&instance->serialize);
+		return -ENOMEM;
+	}
+
+	vcc->dev_data = new;
+
+	tasklet_disable(&instance->receive_tasklet);
+	list_add(&new->list, &instance->vcc_list);
+	tasklet_enable(&instance->receive_tasklet);
+
+	set_bit(ATM_VF_ADDR, &vcc->flags);
+	set_bit(ATM_VF_PARTIAL, &vcc->flags);
+	set_bit(ATM_VF_READY, &vcc->flags);
+
+	up(&instance->serialize);
+
+	tasklet_schedule(&instance->receive_tasklet);
+
+	dbg("udsl_atm_open: allocated vcc data 0x%p (max_pdu: %u)", new, max_pdu);
+
+	return 0;
+}
+
+static void udsl_atm_close(struct atm_vcc *vcc)
+{
+	struct udsl_instance_data *instance = vcc->dev->dev_data;
+	struct udsl_vcc_data *vcc_data = vcc->dev_data;
+
+	dbg("udsl_atm_close called");
+
+	if (!instance || !vcc_data) {
+		dbg("udsl_atm_close: NULL data!");
+		return;
+	}
+
+	dbg("udsl_atm_close: deallocating vcc 0x%p with vpi %d vci %d",
+	    vcc_data, vcc_data->vpi, vcc_data->vci);
+
+	udsl_cancel_send(instance, vcc);
+
+	down(&instance->serialize);	/* vs self, udsl_atm_open */
+
+	tasklet_disable(&instance->receive_tasklet);
+	list_del(&vcc_data->list);
+	tasklet_enable(&instance->receive_tasklet);
+
+	kfree_skb(vcc_data->sarb);
+	vcc_data->sarb = NULL;
+
+	kfree(vcc_data);
+	vcc->dev_data = NULL;
+
+	vcc->vpi = ATM_VPI_UNSPEC;
+	vcc->vci = ATM_VCI_UNSPEC;
+	clear_bit(ATM_VF_READY, &vcc->flags);
+	clear_bit(ATM_VF_PARTIAL, &vcc->flags);
+	clear_bit(ATM_VF_ADDR, &vcc->flags);
+
+	up(&instance->serialize);
+
+	dbg("udsl_atm_close successful");
+}
+
+static int udsl_atm_ioctl(struct atm_dev *dev, unsigned int cmd,
+			  void __user * arg)
+{
+	switch (cmd) {
+	case ATM_QUERYLOOP:
+		return put_user(ATM_LM_NONE, (int __user *)arg) ? -EFAULT : 0;
+	default:
+		return -ENOIOCTLCMD;
+	}
+}
+
+/**********
+**  USB  **
+**********/
+
+int udsl_instance_setup(struct usb_device *dev,
+			struct udsl_instance_data *instance)
+{
+	char *buf;
+	int i, length;
+
+	kref_init(&instance->refcount);	/* one for USB */
+	udsl_get_instance(instance);	/* one for ATM */
+
+	init_MUTEX(&instance->serialize);
+
+	instance->usb_dev = dev;
+
+	INIT_LIST_HEAD(&instance->vcc_list);
+
+	instance->status = UDSL_NO_FIRMWARE;
+	init_waitqueue_head(&instance->firmware_waiters);
+
+	spin_lock_init(&instance->receive_lock);
+	INIT_LIST_HEAD(&instance->spare_receivers);
+	INIT_LIST_HEAD(&instance->filled_receive_buffers);
+
+	tasklet_init(&instance->receive_tasklet, udsl_process_receive, (unsigned long)instance);
+	INIT_LIST_HEAD(&instance->spare_receive_buffers);
+
+	skb_queue_head_init(&instance->sndqueue);
+
+	spin_lock_init(&instance->send_lock);
+	INIT_LIST_HEAD(&instance->spare_senders);
+	INIT_LIST_HEAD(&instance->spare_send_buffers);
+
+	tasklet_init(&instance->send_tasklet, udsl_process_send,
+		     (unsigned long)instance);
+	INIT_LIST_HEAD(&instance->filled_send_buffers);
+
+	/* receive init */
+	for (i = 0; i < num_rcv_urbs; i++) {
+		struct udsl_receiver *rcv = &(instance->receivers[i]);
+
+		if (!(rcv->urb = usb_alloc_urb(0, GFP_KERNEL))) {
+			dbg("udsl_usb_probe: no memory for receive urb %d!", i);
+			goto fail;
+		}
+
+		rcv->instance = instance;
+
+		list_add(&rcv->list, &instance->spare_receivers);
+	}
+
+	for (i = 0; i < num_rcv_bufs; i++) {
+		struct udsl_receive_buffer *buf =
+		    &(instance->receive_buffers[i]);
+
+		buf->base = kmalloc(rcv_buf_size * (ATM_CELL_SIZE + instance->rcv_padding),
+				    GFP_KERNEL);
+		if (!buf->base) {
+			dbg("udsl_usb_probe: no memory for receive buffer %d!", i);
+			goto fail;
+		}
+
+		list_add(&buf->list, &instance->spare_receive_buffers);
+	}
+
+	/* send init */
+	for (i = 0; i < num_snd_urbs; i++) {
+		struct udsl_sender *snd = &(instance->senders[i]);
+
+		if (!(snd->urb = usb_alloc_urb(0, GFP_KERNEL))) {
+			dbg("udsl_usb_probe: no memory for send urb %d!", i);
+			goto fail;
+		}
+
+		snd->instance = instance;
+
+		list_add(&snd->list, &instance->spare_senders);
+	}
+
+	for (i = 0; i < num_snd_bufs; i++) {
+		struct udsl_send_buffer *buf = &(instance->send_buffers[i]);
+
+		buf->base = kmalloc(snd_buf_size * (ATM_CELL_SIZE + instance->snd_padding),
+				    GFP_KERNEL);
+		if (!buf->base) {
+			dbg("udsl_usb_probe: no memory for send buffer %d!", i);
+			goto fail;
+		}
+
+		list_add(&buf->list, &instance->spare_send_buffers);
+	}
+
+	/* ATM init */
+	instance->atm_dev = atm_dev_register(instance->driver_name,
+					     &udsl_atm_devops, -1, NULL);
+	if (!instance->atm_dev) {
+		dbg("udsl_usb_probe: failed to register ATM device!");
+		goto fail;
+	}
+
+	instance->atm_dev->ci_range.vpi_bits = ATM_CI_MAX;
+	instance->atm_dev->ci_range.vci_bits = ATM_CI_MAX;
+	instance->atm_dev->signal = ATM_PHY_SIG_UNKNOWN;
+
+	/* temp init ATM device, set to 128kbit */
+	instance->atm_dev->link_rate = 128 * 1000 / 424;
+
+	/* device description */
+	buf = instance->description;
+	length = sizeof(instance->description);
+
+	if ((i = usb_string(dev, dev->descriptor.iProduct, buf, length)) < 0)
+		goto finish;
+
+	buf += i;
+	length -= i;
+
+	i = scnprintf(buf, length, " (");
+	buf += i;
+	length -= i;
+
+	if (length <= 0 || (i = usb_make_path(dev, buf, length)) < 0)
+		goto finish;
+
+	buf += i;
+	length -= i;
+
+	snprintf(buf, length, ")");
+
+ finish:
+	/* ready for ATM callbacks */
+	wmb();
+	instance->atm_dev->dev_data = instance;
+
+	usb_get_dev(dev);
+
+	return 0;
+
+ fail:
+	for (i = 0; i < num_snd_bufs; i++)
+		kfree(instance->send_buffers[i].base);
+
+	for (i = 0; i < num_snd_urbs; i++)
+		usb_free_urb(instance->senders[i].urb);
+
+	for (i = 0; i < num_rcv_bufs; i++)
+		kfree(instance->receive_buffers[i].base);
+
+	for (i = 0; i < num_rcv_urbs; i++)
+		usb_free_urb(instance->receivers[i].urb);
+
+	return -ENOMEM;
+}
+
+void udsl_instance_disconnect(struct udsl_instance_data *instance)
+{
+	int i;
+
+	dbg("udsl_instance_disconnect entered");
+
+	if (!instance) {
+		dbg("udsl_instance_disconnect: NULL instance!");
+		return;
+	}
+
+	/* receive finalize */
+	tasklet_disable(&instance->receive_tasklet);
+
+	for (i = 0; i < num_rcv_urbs; i++)
+		usb_kill_urb(instance->receivers[i].urb);
+
+	/* no need to take the spinlock */
+	INIT_LIST_HEAD(&instance->filled_receive_buffers);
+	INIT_LIST_HEAD(&instance->spare_receive_buffers);
+
+	tasklet_enable(&instance->receive_tasklet);
+
+	for (i = 0; i < num_rcv_urbs; i++)
+		usb_free_urb(instance->receivers[i].urb);
+
+	for (i = 0; i < num_rcv_bufs; i++)
+		kfree(instance->receive_buffers[i].base);
+
+	/* send finalize */
+	tasklet_disable(&instance->send_tasklet);
+
+	for (i = 0; i < num_snd_urbs; i++)
+		usb_kill_urb(instance->senders[i].urb);
+
+	/* no need to take the spinlock */
+	INIT_LIST_HEAD(&instance->spare_senders);
+	INIT_LIST_HEAD(&instance->spare_send_buffers);
+	instance->current_buffer = NULL;
+
+	tasklet_enable(&instance->send_tasklet);
+
+	for (i = 0; i < num_snd_urbs; i++)
+		usb_free_urb(instance->senders[i].urb);
+
+	for (i = 0; i < num_snd_bufs; i++)
+		kfree(instance->send_buffers[i].base);
+
+	/* ATM finalize */
+	shutdown_atm_dev(instance->atm_dev);
+}
+
+EXPORT_SYMBOL_GPL(udsl_get_instance);
+EXPORT_SYMBOL_GPL(udsl_put_instance);
+EXPORT_SYMBOL_GPL(udsl_instance_setup);
+EXPORT_SYMBOL_GPL(udsl_instance_disconnect);
+
+/***********
+**  init  **
+***********/
+
+static int __init udsl_usb_init(void)
+{
+	dbg("udsl_usb_init: driver version " DRIVER_VERSION);
+
+	if (sizeof(struct udsl_control) > sizeof(((struct sk_buff *) 0)->cb)) {
+		printk(KERN_ERR __FILE__ ": unusable with this kernel!\n");
+		return -EIO;
+	}
+
+	if ((num_rcv_urbs > UDSL_MAX_RCV_URBS)
+	    || (num_snd_urbs > UDSL_MAX_SND_URBS)
+	    || (num_rcv_bufs > UDSL_MAX_RCV_BUFS)
+	    || (num_snd_bufs > UDSL_MAX_SND_BUFS)
+	    || (rcv_buf_size > UDSL_MAX_RCV_BUF_SIZE)
+	    || (snd_buf_size > UDSL_MAX_SND_BUF_SIZE))
+		return -EINVAL;
+
+	return 0;
+}
+
+static void __exit udsl_usb_exit(void)
+{
+}
+
+module_init(udsl_usb_init);
+module_exit(udsl_usb_exit);
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRIVER_VERSION);
+
+/************
+**  debug  **
+************/
+
+#ifdef VERBOSE_DEBUG
+static int udsl_print_packet(const unsigned char *data, int len)
+{
+	unsigned char buffer[256];
+	int i = 0, j = 0;
+
+	for (i = 0; i < len;) {
+		buffer[0] = '\0';
+		sprintf(buffer, "%.3d :", i);
+		for (j = 0; (j < 16) && (i < len); j++, i++) {
+			sprintf(buffer, "%s %2.2x", buffer, data[i]);
+		}
+		dbg("%s", buffer);
+	}
+	return i;
+}
+#endif
diff --git a/drivers/usb/atm/usb_atm.h b/drivers/usb/atm/usb_atm.h
new file mode 100644
index 0000000..cf8c532
--- /dev/null
+++ b/drivers/usb/atm/usb_atm.h
@@ -0,0 +1,176 @@
+/******************************************************************************
+ *  usb_atm.h - Generic USB xDSL driver core
+ *
+ *  Copyright (C) 2001, Alcatel
+ *  Copyright (C) 2003, Duncan Sands, SolNegro, Josep Comas
+ *  Copyright (C) 2004, David Woodhouse
+ *
+ *  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., 59
+ *  Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ ******************************************************************************/
+
+#include <linux/config.h>
+#include <linux/list.h>
+#include <linux/kref.h>
+#include <linux/atm.h>
+#include <linux/atmdev.h>
+#include <asm/semaphore.h>
+
+/*
+#define DEBUG
+#define VERBOSE_DEBUG
+*/
+
+#if !defined (DEBUG) && defined (CONFIG_USB_DEBUG)
+#	define DEBUG
+#endif
+
+#include <linux/usb.h>
+
+#ifdef DEBUG
+#define UDSL_ASSERT(x)	BUG_ON(!(x))
+#else
+#define UDSL_ASSERT(x)	do { if (!(x)) warn("failed assertion '" #x "' at line %d", __LINE__); } while(0)
+#endif
+
+#define UDSL_MAX_RCV_URBS		4
+#define UDSL_MAX_SND_URBS		4
+#define UDSL_MAX_RCV_BUFS		8
+#define UDSL_MAX_SND_BUFS		8
+#define UDSL_MAX_RCV_BUF_SIZE		1024	/* ATM cells */
+#define UDSL_MAX_SND_BUF_SIZE		1024	/* ATM cells */
+#define UDSL_DEFAULT_RCV_URBS		2
+#define UDSL_DEFAULT_SND_URBS		2
+#define UDSL_DEFAULT_RCV_BUFS		4
+#define UDSL_DEFAULT_SND_BUFS		4
+#define UDSL_DEFAULT_RCV_BUF_SIZE	64	/* ATM cells */
+#define UDSL_DEFAULT_SND_BUF_SIZE	64	/* ATM cells */
+
+#define ATM_CELL_HEADER			(ATM_CELL_SIZE - ATM_CELL_PAYLOAD)
+#define UDSL_NUM_CELLS(x)		(((x) + ATM_AAL5_TRAILER + ATM_CELL_PAYLOAD - 1) / ATM_CELL_PAYLOAD)
+
+/* receive */
+
+struct udsl_receive_buffer {
+	struct list_head list;
+	unsigned char *base;
+	unsigned int filled_cells;
+};
+
+struct udsl_receiver {
+	struct list_head list;
+	struct udsl_receive_buffer *buffer;
+	struct urb *urb;
+	struct udsl_instance_data *instance;
+};
+
+struct udsl_vcc_data {
+	/* vpi/vci lookup */
+	struct list_head list;
+	short vpi;
+	int vci;
+	struct atm_vcc *vcc;
+
+	/* raw cell reassembly */
+	struct sk_buff *sarb;
+};
+
+/* send */
+
+struct udsl_send_buffer {
+	struct list_head list;
+	unsigned char *base;
+	unsigned char *free_start;
+	unsigned int free_cells;
+};
+
+struct udsl_sender {
+	struct list_head list;
+	struct udsl_send_buffer *buffer;
+	struct urb *urb;
+	struct udsl_instance_data *instance;
+};
+
+struct udsl_control {
+	struct atm_skb_data atm_data;
+	unsigned int num_cells;
+	unsigned int num_entire;
+	unsigned int pdu_padding;
+	unsigned char aal5_trailer[ATM_AAL5_TRAILER];
+};
+
+#define UDSL_SKB(x)		((struct udsl_control *)(x)->cb)
+
+/* main driver data */
+
+enum udsl_status {
+	UDSL_NO_FIRMWARE,
+	UDSL_LOADING_FIRMWARE,
+	UDSL_LOADED_FIRMWARE
+};
+
+struct udsl_instance_data {
+	struct kref refcount;
+	struct semaphore serialize;
+
+	/* USB device part */
+	struct usb_device *usb_dev;
+	char description[64];
+	int data_endpoint;
+	int snd_padding;
+	int rcv_padding;
+	const char *driver_name;
+
+	/* ATM device part */
+	struct atm_dev *atm_dev;
+	struct list_head vcc_list;
+
+	/* firmware */
+	int (*firmware_wait) (struct udsl_instance_data *);
+	enum udsl_status status;
+	wait_queue_head_t firmware_waiters;
+
+	/* receive */
+	struct udsl_receiver receivers[UDSL_MAX_RCV_URBS];
+	struct udsl_receive_buffer receive_buffers[UDSL_MAX_RCV_BUFS];
+
+	spinlock_t receive_lock;
+	struct list_head spare_receivers;
+	struct list_head filled_receive_buffers;
+
+	struct tasklet_struct receive_tasklet;
+	struct list_head spare_receive_buffers;
+
+	/* send */
+	struct udsl_sender senders[UDSL_MAX_SND_URBS];
+	struct udsl_send_buffer send_buffers[UDSL_MAX_SND_BUFS];
+
+	struct sk_buff_head sndqueue;
+
+	spinlock_t send_lock;
+	struct list_head spare_senders;
+	struct list_head spare_send_buffers;
+
+	struct tasklet_struct send_tasklet;
+	struct sk_buff *current_skb;			/* being emptied */
+	struct udsl_send_buffer *current_buffer;	/* being filled */
+	struct list_head filled_send_buffers;
+};
+
+extern int udsl_instance_setup(struct usb_device *dev,
+			       struct udsl_instance_data *instance);
+extern void udsl_instance_disconnect(struct udsl_instance_data *instance);
+extern void udsl_get_instance(struct udsl_instance_data *instance);
+extern void udsl_put_instance(struct udsl_instance_data *instance);