text: /*
   * Copyright (c) 2012  Bjørn Mork <bjorn@mork.no>
   *
   * The probing code is heavily inspired by cdc_ether, which is:
   * Copyright (C) 2003-2005 by David Brownell
   * Copyright (C) 2006 by Ole Andre Vadla Ravnas (ActiveSync)
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License
   * version 2 as published by the Free Software Foundation.
   */
  
  #include <linux/module.h>
  #include <linux/netdevice.h>
  #include <linux/ethtool.h>
  #include <linux/mii.h>
  #include <linux/usb.h>
  #include <linux/usb/cdc.h>
  #include <linux/usb/usbnet.h>
  #include <linux/usb/cdc-wdm.h>
  
  /* This driver supports wwan (3G/LTE/?) devices using a vendor
   * specific management protocol called Qualcomm MSM Interface (QMI) -
   * in addition to the more common AT commands over serial interface
   * management
   *
   * QMI is wrapped in CDC, using CDC encapsulated commands on the
   * control ("master") interface of a two-interface CDC Union
   * resembling standard CDC ECM.  The devices do not use the control
   * interface for any other CDC messages.  Most likely because the
   * management protocol is used in place of the standard CDC
   * notifications NOTIFY_NETWORK_CONNECTION and NOTIFY_SPEED_CHANGE
   *
   * Alternatively, control and data functions can be combined in a
   * single USB interface.
   *
   * Handling a protocol like QMI is out of the scope for any driver.
   * It is exported as a character device using the cdc-wdm driver as
   * a subdriver, enabling userspace applications ("modem managers") to
   * handle it.
   *
   * These devices may alternatively/additionally be configured using AT
   * commands on a serial interface
   */
  
  /* driver specific data */
  struct qmi_wwan_state {
  	struct usb_driver *subdriver;
  	atomic_t pmcount;
  	unsigned long unused;
  	struct usb_interface *control;
  	struct usb_interface *data;
  };
  
  /* using a counter to merge subdriver requests with our own into a combined state */
  static int qmi_wwan_manage_power(struct usbnet *dev, int on)
  {
  	struct qmi_wwan_state *info = (void *)&dev->data;
  	int rv = 0;
  
  	dev_dbg(&dev->intf->dev, "%s() pmcount=%d, on=%d\n", __func__, atomic_read(&info->pmcount), on);
  
  	if ((on && atomic_add_return(1, &info->pmcount) == 1) || (!on && atomic_dec_and_test(&info->pmcount))) {
  		/* need autopm_get/put here to ensure the usbcore sees the new value */
  		rv = usb_autopm_get_interface(dev->intf);
  		if (rv < 0)
  			goto err;
  		dev->intf->needs_remote_wakeup = on;
  		usb_autopm_put_interface(dev->intf);
  	}
  err:
  	return rv;
  }
  
  static int qmi_wwan_cdc_wdm_manage_power(struct usb_interface *intf, int on)
  {
  	struct usbnet *dev = usb_get_intfdata(intf);
  
  	/* can be called while disconnecting */
  	if (!dev)
  		return 0;
  	return qmi_wwan_manage_power(dev, on);
  }
  
  /* collect all three endpoints and register subdriver */
  static int qmi_wwan_register_subdriver(struct usbnet *dev)
  {
  	int rv;
  	struct usb_driver *subdriver = NULL;
  	struct qmi_wwan_state *info = (void *)&dev->data;
  
  	/* collect bulk endpoints */
  	rv = usbnet_get_endpoints(dev, info->data);
  	if (rv < 0)
  		goto err;
  
  	/* update status endpoint if separate control interface */
  	if (info->control != info->data)
  		dev->status = &info->control->cur_altsetting->endpoint[0];
  
  	/* require interrupt endpoint for subdriver */
  	if (!dev->status) {
  		rv = -EINVAL;
  		goto err;
  	}
  
  	/* for subdriver power management */
  	atomic_set(&info->pmcount, 0);
  
  	/* register subdriver */
  	subdriver = usb_cdc_wdm_register(info->control, &dev->status->desc, 512, &qmi_wwan_cdc_wdm_manage_power);
  	if (IS_ERR(subdriver)) {
  		dev_err(&info->control->dev, "subdriver registration failed\n");
  		rv = PTR_ERR(subdriver);
  		goto err;
  	}
  
  	/* prevent usbnet from using status endpoint */
  	dev->status = NULL;
  
  	/* save subdriver struct for suspend/resume wrappers */
  	info->subdriver = subdriver;
  
  err:
  	return rv;
  }
  
  static int qmi_wwan_bind(struct usbnet *dev, struct usb_interface *intf)
  {
  	int status = -1;
  	u8 *buf = intf->cur_altsetting->extra;
  	int len = intf->cur_altsetting->extralen;
  	struct usb_interface_descriptor *desc = &intf->cur_altsetting->desc;
  	struct usb_cdc_union_desc *cdc_union = NULL;
  	struct usb_cdc_ether_desc *cdc_ether = NULL;
  	u32 found = 0;
  	struct usb_driver *driver = driver_of(intf);
  	struct qmi_wwan_state *info = (void *)&dev->data;
  
  	BUILD_BUG_ON((sizeof(((struct usbnet *)0)->data) < sizeof(struct qmi_wwan_state)));
  
  	/* require a single interrupt status endpoint for subdriver */
  	if (intf->cur_altsetting->desc.bNumEndpoints != 1)
  		goto err;
  
  	while (len > 3) {
  		struct usb_descriptor_header *h = (void *)buf;
  
  		/* ignore any misplaced descriptors */
  		if (h->bDescriptorType != USB_DT_CS_INTERFACE)
  			goto next_desc;
  
  		/* buf[2] is CDC descriptor subtype */
  		switch (buf[2]) {
  		case USB_CDC_HEADER_TYPE:
  			if (found & 1 << USB_CDC_HEADER_TYPE) {
  				dev_dbg(&intf->dev, "extra CDC header\n");
  				goto err;
  			}
  			if (h->bLength != sizeof(struct usb_cdc_header_desc)) {
  				dev_dbg(&intf->dev, "CDC header len %u\n", h->bLength);
  				goto err;
  			}
  			break;
  		case USB_CDC_UNION_TYPE:
  			if (found & 1 << USB_CDC_UNION_TYPE) {
  				dev_dbg(&intf->dev, "extra CDC union\n");
  				goto err;
  			}
  			if (h->bLength != sizeof(struct usb_cdc_union_desc)) {
  				dev_dbg(&intf->dev, "CDC union len %u\n", h->bLength);
  				goto err;
  			}
  			cdc_union = (struct usb_cdc_union_desc *)buf;
  			break;
  		case USB_CDC_ETHERNET_TYPE:
  			if (found & 1 << USB_CDC_ETHERNET_TYPE) {
  				dev_dbg(&intf->dev, "extra CDC ether\n");
  				goto err;
  			}
  			if (h->bLength != sizeof(struct usb_cdc_ether_desc)) {
  				dev_dbg(&intf->dev, "CDC ether len %u\n",  h->bLength);
  				goto err;
  			}
  			cdc_ether = (struct usb_cdc_ether_desc *)buf;
  			break;
  		}
  
  		/*
  		 * Remember which CDC functional descriptors we've seen.  Works
  		 * for all types we care about, of which USB_CDC_ETHERNET_TYPE
  		 * (0x0f) is the highest numbered
  		 */
  		if (buf[2] < 32)
  			found |= 1 << buf[2];
  
  next_desc:
  		len -= h->bLength;
  		buf += h->bLength;
  	}
  
  	/* did we find all the required ones? */
  	if (!(found & (1 << USB_CDC_HEADER_TYPE)) ||
  	    !(found & (1 << USB_CDC_UNION_TYPE))) {
  		dev_err(&intf->dev, "CDC functional descriptors missing\n");
  		goto err;
  	}
  
  	/* verify CDC Union */
  	if (desc->bInterfaceNumber != cdc_union->bMasterInterface0) {
  		dev_err(&intf->dev, "bogus CDC Union: master=%u\n", cdc_union->bMasterInterface0);
  		goto err;
  	}
  
  	/* need to save these for unbind */
  	info->control = intf;
  	info->data = usb_ifnum_to_if(dev->udev,	cdc_union->bSlaveInterface0);
  	if (!info->data) {
  		dev_err(&intf->dev, "bogus CDC Union: slave=%u\n", cdc_union->bSlaveInterface0);
  		goto err;
  	}
  
  	/* errors aren't fatal - we can live with the dynamic address */
  	if (cdc_ether) {
  		dev->hard_mtu = le16_to_cpu(cdc_ether->wMaxSegmentSize);
  		usbnet_get_ethernet_addr(dev, cdc_ether->iMACAddress);
  	}
  
  	/* claim data interface and set it up */
  	status = usb_driver_claim_interface(driver, info->data, dev);
  	if (status < 0)
  		goto err;
  
  	status = qmi_wwan_register_subdriver(dev);
  	if (status < 0) {
  		usb_set_intfdata(info->data, NULL);
  		usb_driver_release_interface(driver, info->data);
  	}
  
  err:
  	return status;
  }
  
  /* Some devices combine the "control" and "data" functions into a
   * single interface with all three endpoints: interrupt + bulk in and
   * out
   */
  static int qmi_wwan_bind_shared(struct usbnet *dev, struct usb_interface *intf)
  {
  	struct qmi_wwan_state *info = (void *)&dev->data;
  
  	/*  control and data is shared */
  	info->control = intf;
  	info->data = intf;
  	return qmi_wwan_register_subdriver(dev);
  }
  
  static void qmi_wwan_unbind(struct usbnet *dev, struct usb_interface *intf)
  {
  	struct qmi_wwan_state *info = (void *)&dev->data;
  	struct usb_driver *driver = driver_of(intf);
  	struct usb_interface *other;
  
  	if (info->subdriver && info->subdriver->disconnect)
  		info->subdriver->disconnect(info->control);
  
  	/* allow user to unbind using either control or data */
  	if (intf == info->control)
  		other = info->data;
  	else
  		other = info->control;
  
  	/* only if not shared */
  	if (other && intf != other) {
  		usb_set_intfdata(other, NULL);
  		usb_driver_release_interface(driver, other);
  	}
  
  	info->subdriver = NULL;
  	info->data = NULL;
  	info->control = NULL;
  }
  
  /* suspend/resume wrappers calling both usbnet and the cdc-wdm
   * subdriver if present.
   *
   * NOTE: cdc-wdm also supports pre/post_reset, but we cannot provide
   * wrappers for those without adding usbnet reset support first.
   */
  static int qmi_wwan_suspend(struct usb_interface *intf, pm_message_t message)
  {
  	struct usbnet *dev = usb_get_intfdata(intf);
  	struct qmi_wwan_state *info = (void *)&dev->data;
  	int ret;
  
  	ret = usbnet_suspend(intf, message);
  	if (ret < 0)
  		goto err;
  
  	if (intf == info->control && info->subdriver && info->subdriver->suspend)
  		ret = info->subdriver->suspend(intf, message);
  	if (ret < 0)
  		usbnet_resume(intf);
  err:
  	return ret;
  }
  
  static int qmi_wwan_resume(struct usb_interface *intf)
  {
  	struct usbnet *dev = usb_get_intfdata(intf);
  	struct qmi_wwan_state *info = (void *)&dev->data;
  	int ret = 0;
  	bool callsub = (intf == info->control && info->subdriver && info->subdriver->resume);
  
  	if (callsub)
  		ret = info->subdriver->resume(intf);
  	if (ret < 0)
  		goto err;
  	ret = usbnet_resume(intf);
  	if (ret < 0 && callsub && info->subdriver->suspend)
  		info->subdriver->suspend(intf, PMSG_SUSPEND);
  err:
  	return ret;
  }
  
  static const struct driver_info	qmi_wwan_info = {
  	.description	= "WWAN/QMI device",
  	.flags		= FLAG_WWAN,
  	.bind		= qmi_wwan_bind,
  	.unbind		= qmi_wwan_unbind,
  	.manage_power	= qmi_wwan_manage_power,
  };
  
  static const struct driver_info	qmi_wwan_shared = {
  	.description	= "WWAN/QMI device",
  	.flags		= FLAG_WWAN,
  	.bind		= qmi_wwan_bind_shared,
  	.unbind		= qmi_wwan_unbind,
  	.manage_power	= qmi_wwan_manage_power,
  };
  
  #define HUAWEI_VENDOR_ID	0x12D1
  
  /* map QMI/wwan function by a fixed interface number */
  #define QMI_FIXED_INTF(vend, prod, num) \
  	USB_DEVICE_INTERFACE_NUMBER(vend, prod, num), \
  	.driver_info = (unsigned long)&qmi_wwan_shared
  
  /* Gobi 1000 QMI/wwan interface number is 3 according to qcserial */
  #define QMI_GOBI1K_DEVICE(vend, prod) \
  	QMI_FIXED_INTF(vend, prod, 3)
  
  /* Gobi 2000/3000 QMI/wwan interface number is 0 according to qcserial */
  #define QMI_GOBI_DEVICE(vend, prod) \
  	QMI_FIXED_INTF(vend, prod, 0)
  
  static const struct usb_device_id products[] = {
  	/* 1. CDC ECM like devices match on the control interface */
  	{	/* Huawei E392, E398 and possibly others sharing both device id and more... */
  		USB_VENDOR_AND_INTERFACE_INFO(HUAWEI_VENDOR_ID, USB_CLASS_VENDOR_SPEC, 1, 9),
  		.driver_info        = (unsigned long)&qmi_wwan_info,
  	},
  	{	/* Vodafone/Huawei K5005 (12d1:14c8) and similar modems */
  		USB_VENDOR_AND_INTERFACE_INFO(HUAWEI_VENDOR_ID, USB_CLASS_VENDOR_SPEC, 1, 57),
  		.driver_info        = (unsigned long)&qmi_wwan_info,
  	},
  
  	/* 2. Combined interface devices matching on class+protocol */
  	{	/* Huawei E367 and possibly others in "Windows mode" */
  		USB_VENDOR_AND_INTERFACE_INFO(HUAWEI_VENDOR_ID, USB_CLASS_VENDOR_SPEC, 1, 7),
  		.driver_info        = (unsigned long)&qmi_wwan_info,
  	},
  	{	/* Huawei E392, E398 and possibly others in "Windows mode" */
  		USB_VENDOR_AND_INTERFACE_INFO(HUAWEI_VENDOR_ID, USB_CLASS_VENDOR_SPEC, 1, 17),
  		.driver_info        = (unsigned long)&qmi_wwan_shared,
  	},
  	{	/* Pantech UML290, P4200 and more */
  		USB_VENDOR_AND_INTERFACE_INFO(0x106c, USB_CLASS_VENDOR_SPEC, 0xf0, 0xff),
  		.driver_info        = (unsigned long)&qmi_wwan_shared,
  	},
  	{	/* Pantech UML290 - newer firmware */
  		USB_VENDOR_AND_INTERFACE_INFO(0x106c, USB_CLASS_VENDOR_SPEC, 0xf1, 0xff),
  		.driver_info        = (unsigned long)&qmi_wwan_shared,
  	},
  
  	/* 3. Combined interface devices matching on interface number */
  	{QMI_FIXED_INTF(0x19d2, 0x0055, 1)},	/* ZTE (Vodafone) K3520-Z */
  	{QMI_FIXED_INTF(0x19d2, 0x0063, 4)},	/* ZTE (Vodafone) K3565-Z */
  	{QMI_FIXED_INTF(0x19d2, 0x0104, 4)},	/* ZTE (Vodafone) K4505-Z */
  	{QMI_FIXED_INTF(0x19d2, 0x0157, 5)},	/* ZTE MF683 */
  	{QMI_FIXED_INTF(0x19d2, 0x0167, 4)},	/* ZTE MF820D */
  	{QMI_FIXED_INTF(0x19d2, 0x0326, 4)},	/* ZTE MF821D */
  	{QMI_FIXED_INTF(0x19d2, 0x1008, 4)},	/* ZTE (Vodafone) K3570-Z */
  	{QMI_FIXED_INTF(0x19d2, 0x1010, 4)},	/* ZTE (Vodafone) K3571-Z */
  	{QMI_FIXED_INTF(0x19d2, 0x1018, 3)},	/* ZTE (Vodafone) K5006-Z */
  	{QMI_FIXED_INTF(0x19d2, 0x1402, 2)},	/* ZTE MF60 */
  	{QMI_FIXED_INTF(0x19d2, 0x2002, 4)},	/* ZTE (Vodafone) K3765-Z */
  	{QMI_FIXED_INTF(0x0f3d, 0x68a2, 8)},    /* Sierra Wireless MC7700 */
  	{QMI_FIXED_INTF(0x114f, 0x68a2, 8)},    /* Sierra Wireless MC7750 */
  	{QMI_FIXED_INTF(0x1199, 0x68a2, 8)},	/* Sierra Wireless MC7710 in QMI mode */
  	{QMI_FIXED_INTF(0x1199, 0x68a2, 19)},	/* Sierra Wireless MC7710 in QMI mode */
  	{QMI_FIXED_INTF(0x1199, 0x901c, 8)},    /* Sierra Wireless EM7700 */
  
  	/* 4. Gobi 1000 devices */
  	{QMI_GOBI1K_DEVICE(0x05c6, 0x9212)},	/* Acer Gobi Modem Device */
  	{QMI_GOBI1K_DEVICE(0x03f0, 0x1f1d)},	/* HP un2400 Gobi Modem Device */
  	{QMI_GOBI1K_DEVICE(0x04da, 0x250d)},	/* Panasonic Gobi Modem device */
  	{QMI_GOBI1K_DEVICE(0x413c, 0x8172)},	/* Dell Gobi Modem device */
  	{QMI_GOBI1K_DEVICE(0x1410, 0xa001)},	/* Novatel Gobi Modem device */
  	{QMI_GOBI1K_DEVICE(0x0b05, 0x1776)},	/* Asus Gobi Modem device */
  	{QMI_GOBI1K_DEVICE(0x19d2, 0xfff3)},	/* ONDA Gobi Modem device */
  	{QMI_GOBI1K_DEVICE(0x05c6, 0x9001)},	/* Generic Gobi Modem device */
  	{QMI_GOBI1K_DEVICE(0x05c6, 0x9002)},	/* Generic Gobi Modem device */
  	{QMI_GOBI1K_DEVICE(0x05c6, 0x9202)},	/* Generic Gobi Modem device */
  	{QMI_GOBI1K_DEVICE(0x05c6, 0x9203)},	/* Generic Gobi Modem device */
  	{QMI_GOBI1K_DEVICE(0x05c6, 0x9222)},	/* Generic Gobi Modem device */
  	{QMI_GOBI1K_DEVICE(0x05c6, 0x9009)},	/* Generic Gobi Modem device */
  
  	/* 5. Gobi 2000 and 3000 devices */
  	{QMI_GOBI_DEVICE(0x413c, 0x8186)},	/* Dell Gobi 2000 Modem device (N0218, VU936) */
  	{QMI_GOBI_DEVICE(0x413c, 0x8194)},	/* Dell Gobi 3000 Composite */
  	{QMI_GOBI_DEVICE(0x05c6, 0x920b)},	/* Generic Gobi 2000 Modem device */
  	{QMI_GOBI_DEVICE(0x05c6, 0x920d)},	/* Gobi 3000 Composite */
  	{QMI_GOBI_DEVICE(0x05c6, 0x9225)},	/* Sony Gobi 2000 Modem device (N0279, VU730) */
  	{QMI_GOBI_DEVICE(0x05c6, 0x9245)},	/* Samsung Gobi 2000 Modem device (VL176) */
  	{QMI_GOBI_DEVICE(0x03f0, 0x251d)},	/* HP Gobi 2000 Modem device (VP412) */
  	{QMI_GOBI_DEVICE(0x05c6, 0x9215)},	/* Acer Gobi 2000 Modem device (VP413) */
  	{QMI_GOBI_DEVICE(0x05c6, 0x9265)},	/* Asus Gobi 2000 Modem device (VR305) */
  	{QMI_GOBI_DEVICE(0x05c6, 0x9235)},	/* Top Global Gobi 2000 Modem device (VR306) */
  	{QMI_GOBI_DEVICE(0x05c6, 0x9275)},	/* iRex Technologies Gobi 2000 Modem device (VR307) */
  	{QMI_GOBI_DEVICE(0x1199, 0x68a5)},	/* Sierra Wireless Modem */
  	{QMI_GOBI_DEVICE(0x1199, 0x68a9)},	/* Sierra Wireless Modem */
  	{QMI_GOBI_DEVICE(0x1199, 0x9001)},	/* Sierra Wireless Gobi 2000 Modem device (VT773) */
  	{QMI_GOBI_DEVICE(0x1199, 0x9002)},	/* Sierra Wireless Gobi 2000 Modem device (VT773) */
  	{QMI_GOBI_DEVICE(0x1199, 0x9003)},	/* Sierra Wireless Gobi 2000 Modem device (VT773) */
  	{QMI_GOBI_DEVICE(0x1199, 0x9004)},	/* Sierra Wireless Gobi 2000 Modem device (VT773) */
  	{QMI_GOBI_DEVICE(0x1199, 0x9005)},	/* Sierra Wireless Gobi 2000 Modem device (VT773) */
  	{QMI_GOBI_DEVICE(0x1199, 0x9006)},	/* Sierra Wireless Gobi 2000 Modem device (VT773) */
  	{QMI_GOBI_DEVICE(0x1199, 0x9007)},	/* Sierra Wireless Gobi 2000 Modem device (VT773) */
  	{QMI_GOBI_DEVICE(0x1199, 0x9008)},	/* Sierra Wireless Gobi 2000 Modem device (VT773) */
  	{QMI_GOBI_DEVICE(0x1199, 0x9009)},	/* Sierra Wireless Gobi 2000 Modem device (VT773) */
  	{QMI_GOBI_DEVICE(0x1199, 0x900a)},	/* Sierra Wireless Gobi 2000 Modem device (VT773) */
  	{QMI_GOBI_DEVICE(0x1199, 0x9011)},	/* Sierra Wireless Gobi 2000 Modem device (MC8305) */
  	{QMI_FIXED_INTF(0x1199, 0x9011, 5)},	/* alternate interface number!? */
  	{QMI_GOBI_DEVICE(0x16d8, 0x8002)},	/* CMDTech Gobi 2000 Modem device (VU922) */
  	{QMI_GOBI_DEVICE(0x05c6, 0x9205)},	/* Gobi 2000 Modem device */
  	{QMI_GOBI_DEVICE(0x1199, 0x9013)},	/* Sierra Wireless Gobi 3000 Modem device (MC8355) */
  	{QMI_GOBI_DEVICE(0x03f0, 0x371d)},	/* HP un2430 Mobile Broadband Module */
  	{QMI_GOBI_DEVICE(0x1199, 0x9015)},	/* Sierra Wireless Gobi 3000 Modem device */
  	{QMI_GOBI_DEVICE(0x1199, 0x9019)},	/* Sierra Wireless Gobi 3000 Modem device */
  	{QMI_GOBI_DEVICE(0x1199, 0x901b)},	/* Sierra Wireless MC7770 */
  	{QMI_GOBI_DEVICE(0x12d1, 0x14f1)},	/* Sony Gobi 3000 Composite */
  	{QMI_GOBI_DEVICE(0x1410, 0xa021)},	/* Foxconn Gobi 3000 Modem device (Novatel E396) */
  
  	{ }					/* END */
  };
  MODULE_DEVICE_TABLE(usb, products);
  
  static int qmi_wwan_probe(struct usb_interface *intf, const struct usb_device_id *prod)
  {
  	struct usb_device_id *id = (struct usb_device_id *)prod;
  
  	/* Workaround to enable dynamic IDs.  This disables usbnet
  	 * blacklisting functionality.  Which, if required, can be
  	 * reimplemented here by using a magic "blacklist" value
  	 * instead of 0 in the static device id table
  	 */
  	if (!id->driver_info) {
  		dev_dbg(&intf->dev, "setting defaults for dynamic device id\n");
  		id->driver_info = (unsigned long)&qmi_wwan_shared;
  	}
  
  	return usbnet_probe(intf, id);
  }
  
  static struct usb_driver qmi_wwan_driver = {
  	.name		      = "qmi_wwan",
  	.id_table	      = products,
  	.probe		      = qmi_wwan_probe,
  	.disconnect	      = usbnet_disconnect,
  	.suspend	      = qmi_wwan_suspend,
  	.resume		      =	qmi_wwan_resume,
  	.reset_resume         = qmi_wwan_resume,
  	.supports_autosuspend = 1,
  	.disable_hub_initiated_lpm = 1,
  };
  
  module_usb_driver(qmi_wwan_driver);
  
  MODULE_AUTHOR("Bjørn Mork <bjorn@mork.no>");
  MODULE_DESCRIPTION("Qualcomm MSM Interface (QMI) WWAN driver");
  MODULE_LICENSE("GPL");
  