Initial file dump from open source releaseHEADmaster

1 files changed, 1281 insertions, 0 deletions

diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c
new file mode 100644
index 00000000..43afde8f
--- /dev/null
+++ b/drivers/net/usb/cdc_ncm.c
@@ -0,0 +1,1281 @@
+/*
+ * cdc_ncm.c
+ *
+ * Copyright (C) ST-Ericsson 2010-2012
+ * Contact: Alexey Orishko <alexey.orishko@stericsson.com>
+ * Original author: Hans Petter Selasky <hans.petter.selasky@stericsson.com>
+ *
+ * USB Host Driver for Network Control Model (NCM)
+ * http://www.usb.org/developers/devclass_docs/NCM10.zip
+ *
+ * The NCM encoding, decoding and initialization logic
+ * derives from FreeBSD 8.x. if_cdce.c and if_cdcereg.h
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose this file to be licensed under the terms
+ * of the GNU General Public License (GPL) Version 2 or the 2-clause
+ * BSD license listed below:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <linux/ctype.h>
+#include <linux/ethtool.h>
+#include <linux/workqueue.h>
+#include <linux/mii.h>
+#include <linux/crc32.h>
+#include <linux/usb.h>
+#include <linux/hrtimer.h>
+#include <linux/atomic.h>
+#include <linux/usb/usbnet.h>
+#include <linux/usb/cdc.h>
+#include <linux/usb/cdc_ncm.h>
+
+#define	DRIVER_VERSION				"14-Mar-2012"
+
+#if IS_ENABLED(CONFIG_USB_NET_CDC_MBIM)
+static bool prefer_mbim = true;
+#else
+static bool prefer_mbim;
+#endif
+module_param(prefer_mbim, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(prefer_mbim, "Prefer MBIM setting on dual NCM/MBIM functions");
+
+static void cdc_ncm_txpath_bh(unsigned long param);
+static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx);
+static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *hr_timer);
+static struct usb_driver cdc_ncm_driver;
+
+static void
+cdc_ncm_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *info)
+{
+	struct usbnet *dev = netdev_priv(net);
+
+	strlcpy(info->driver, dev->driver_name, sizeof(info->driver));
+	strlcpy(info->version, DRIVER_VERSION, sizeof(info->version));
+	strlcpy(info->fw_version, dev->driver_info->description,
+		sizeof(info->fw_version));
+	usb_make_path(dev->udev, info->bus_info, sizeof(info->bus_info));
+}
+
+static u8 cdc_ncm_setup(struct cdc_ncm_ctx *ctx)
+{
+	u32 val;
+	u8 flags;
+	u8 iface_no;
+	int err;
+	int eth_hlen;
+	u16 ntb_fmt_supported;
+	u32 min_dgram_size;
+	u32 min_hdr_size;
+	struct usbnet *dev = netdev_priv(ctx->netdev);
+
+	iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
+
+	err = usbnet_read_cmd(dev, USB_CDC_GET_NTB_PARAMETERS,
+			      USB_TYPE_CLASS | USB_DIR_IN
+			      |USB_RECIP_INTERFACE,
+			      0, iface_no, &ctx->ncm_parm,
+			      sizeof(ctx->ncm_parm));
+	if (err < 0) {
+		pr_debug("failed GET_NTB_PARAMETERS\n");
+		return 1;
+	}
+
+	/* read correct set of parameters according to device mode */
+	ctx->rx_max = le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize);
+	ctx->tx_max = le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize);
+	ctx->tx_remainder = le16_to_cpu(ctx->ncm_parm.wNdpOutPayloadRemainder);
+	ctx->tx_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutDivisor);
+	ctx->tx_ndp_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutAlignment);
+	/* devices prior to NCM Errata shall set this field to zero */
+	ctx->tx_max_datagrams = le16_to_cpu(ctx->ncm_parm.wNtbOutMaxDatagrams);
+	ntb_fmt_supported = le16_to_cpu(ctx->ncm_parm.bmNtbFormatsSupported);
+
+	eth_hlen = ETH_HLEN;
+	min_dgram_size = CDC_NCM_MIN_DATAGRAM_SIZE;
+	min_hdr_size = CDC_NCM_MIN_HDR_SIZE;
+	if (ctx->mbim_desc != NULL) {
+		flags = ctx->mbim_desc->bmNetworkCapabilities;
+		eth_hlen = 0;
+		min_dgram_size = CDC_MBIM_MIN_DATAGRAM_SIZE;
+		min_hdr_size = 0;
+	} else if (ctx->func_desc != NULL) {
+		flags = ctx->func_desc->bmNetworkCapabilities;
+	} else {
+		flags = 0;
+	}
+
+	pr_debug("dwNtbInMaxSize=%u dwNtbOutMaxSize=%u "
+		 "wNdpOutPayloadRemainder=%u wNdpOutDivisor=%u "
+		 "wNdpOutAlignment=%u wNtbOutMaxDatagrams=%u flags=0x%x\n",
+		 ctx->rx_max, ctx->tx_max, ctx->tx_remainder, ctx->tx_modulus,
+		 ctx->tx_ndp_modulus, ctx->tx_max_datagrams, flags);
+
+	/* max count of tx datagrams */
+	if ((ctx->tx_max_datagrams == 0) ||
+			(ctx->tx_max_datagrams > CDC_NCM_DPT_DATAGRAMS_MAX))
+		ctx->tx_max_datagrams = CDC_NCM_DPT_DATAGRAMS_MAX;
+
+	/* verify maximum size of received NTB in bytes */
+	if (ctx->rx_max < USB_CDC_NCM_NTB_MIN_IN_SIZE) {
+		pr_debug("Using min receive length=%d\n",
+						USB_CDC_NCM_NTB_MIN_IN_SIZE);
+		ctx->rx_max = USB_CDC_NCM_NTB_MIN_IN_SIZE;
+	}
+
+	if (ctx->rx_max > CDC_NCM_NTB_MAX_SIZE_RX) {
+		pr_debug("Using default maximum receive length=%d\n",
+						CDC_NCM_NTB_MAX_SIZE_RX);
+		ctx->rx_max = CDC_NCM_NTB_MAX_SIZE_RX;
+	}
+
+	/* inform device about NTB input size changes */
+	if (ctx->rx_max != le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize)) {
+		__le32 dwNtbInMaxSize = cpu_to_le32(ctx->rx_max);
+
+		err = usbnet_write_cmd(dev, USB_CDC_SET_NTB_INPUT_SIZE,
+				       USB_TYPE_CLASS | USB_DIR_OUT
+				       | USB_RECIP_INTERFACE,
+				       0, iface_no, &dwNtbInMaxSize, 4);
+		if (err < 0)
+			pr_debug("Setting NTB Input Size failed\n");
+	}
+
+	/* verify maximum size of transmitted NTB in bytes */
+	if ((ctx->tx_max <
+	    (min_hdr_size + min_dgram_size)) ||
+	    (ctx->tx_max > CDC_NCM_NTB_MAX_SIZE_TX)) {
+		pr_debug("Using default maximum transmit length=%d\n",
+						CDC_NCM_NTB_MAX_SIZE_TX);
+		ctx->tx_max = CDC_NCM_NTB_MAX_SIZE_TX;
+	}
+
+	/*
+	 * verify that the structure alignment is:
+	 * - power of two
+	 * - not greater than the maximum transmit length
+	 * - not less than four bytes
+	 */
+	val = ctx->tx_ndp_modulus;
+
+	if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
+	    (val != ((-val) & val)) || (val >= ctx->tx_max)) {
+		pr_debug("Using default alignment: 4 bytes\n");
+		ctx->tx_ndp_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
+	}
+
+	/*
+	 * verify that the payload alignment is:
+	 * - power of two
+	 * - not greater than the maximum transmit length
+	 * - not less than four bytes
+	 */
+	val = ctx->tx_modulus;
+
+	if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
+	    (val != ((-val) & val)) || (val >= ctx->tx_max)) {
+		pr_debug("Using default transmit modulus: 4 bytes\n");
+		ctx->tx_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
+	}
+
+	/* verify the payload remainder */
+	if (ctx->tx_remainder >= ctx->tx_modulus) {
+		pr_debug("Using default transmit remainder: 0 bytes\n");
+		ctx->tx_remainder = 0;
+	}
+
+	/* adjust TX-remainder according to NCM specification. */
+	ctx->tx_remainder = ((ctx->tx_remainder - eth_hlen) &
+			     (ctx->tx_modulus - 1));
+
+	/* additional configuration */
+
+	/* set CRC Mode */
+	if (flags & USB_CDC_NCM_NCAP_CRC_MODE) {
+		err = usbnet_write_cmd(dev, USB_CDC_SET_CRC_MODE,
+				       USB_TYPE_CLASS | USB_DIR_OUT
+				       | USB_RECIP_INTERFACE,
+				       USB_CDC_NCM_CRC_NOT_APPENDED,
+				       iface_no, NULL, 0);
+		if (err < 0)
+			pr_debug("Setting CRC mode off failed\n");
+	}
+
+	/* set NTB format, if both formats are supported */
+	if (ntb_fmt_supported & USB_CDC_NCM_NTH32_SIGN) {
+		err = usbnet_write_cmd(dev, USB_CDC_SET_NTB_FORMAT,
+				       USB_TYPE_CLASS | USB_DIR_OUT
+				       | USB_RECIP_INTERFACE,
+				       USB_CDC_NCM_NTB16_FORMAT,
+				       iface_no, NULL, 0);
+		if (err < 0)
+			pr_debug("Setting NTB format to 16-bit failed\n");
+	}
+
+	ctx->max_datagram_size = min_dgram_size;
+
+	/* set Max Datagram Size (MTU) */
+	if (flags & USB_CDC_NCM_NCAP_MAX_DATAGRAM_SIZE) {
+		__le16 max_datagram_size;
+		u16 eth_max_sz;
+		if (ctx->ether_desc != NULL)
+			eth_max_sz = le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
+		else if (ctx->mbim_desc != NULL)
+			eth_max_sz = le16_to_cpu(ctx->mbim_desc->wMaxSegmentSize);
+		else
+			goto max_dgram_err;
+
+		err = usbnet_read_cmd(dev, USB_CDC_GET_MAX_DATAGRAM_SIZE,
+				      USB_TYPE_CLASS | USB_DIR_IN
+				      | USB_RECIP_INTERFACE,
+				      0, iface_no, &max_datagram_size, 2);
+		if (err < 0) {
+			pr_debug("GET_MAX_DATAGRAM_SIZE failed, use size=%u\n",
+				 min_dgram_size);
+		} else {
+			ctx->max_datagram_size =
+				le16_to_cpu(max_datagram_size);
+			/* Check Eth descriptor value */
+			if (ctx->max_datagram_size > eth_max_sz)
+					ctx->max_datagram_size = eth_max_sz;
+
+			if (ctx->max_datagram_size > CDC_NCM_MAX_DATAGRAM_SIZE)
+				ctx->max_datagram_size = CDC_NCM_MAX_DATAGRAM_SIZE;
+
+			if (ctx->max_datagram_size < min_dgram_size)
+				ctx->max_datagram_size = min_dgram_size;
+
+			/* if value changed, update device */
+			if (ctx->max_datagram_size !=
+					le16_to_cpu(max_datagram_size)) {
+				err = usbnet_write_cmd(dev,
+						USB_CDC_SET_MAX_DATAGRAM_SIZE,
+						USB_TYPE_CLASS | USB_DIR_OUT
+						 | USB_RECIP_INTERFACE,
+						0,
+						iface_no, &max_datagram_size,
+						2);
+				if (err < 0)
+					pr_debug("SET_MAX_DGRAM_SIZE failed\n");
+			}
+		}
+	}
+
+max_dgram_err:
+	if (ctx->netdev->mtu != (ctx->max_datagram_size - eth_hlen))
+		ctx->netdev->mtu = ctx->max_datagram_size - eth_hlen;
+
+	return 0;
+}
+
+static void
+cdc_ncm_find_endpoints(struct cdc_ncm_ctx *ctx, struct usb_interface *intf)
+{
+	struct usb_host_endpoint *e;
+	u8 ep;
+
+	for (ep = 0; ep < intf->cur_altsetting->desc.bNumEndpoints; ep++) {
+
+		e = intf->cur_altsetting->endpoint + ep;
+		switch (e->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
+		case USB_ENDPOINT_XFER_INT:
+			if (usb_endpoint_dir_in(&e->desc)) {
+				if (ctx->status_ep == NULL)
+					ctx->status_ep = e;
+			}
+			break;
+
+		case USB_ENDPOINT_XFER_BULK:
+			if (usb_endpoint_dir_in(&e->desc)) {
+				if (ctx->in_ep == NULL)
+					ctx->in_ep = e;
+			} else {
+				if (ctx->out_ep == NULL)
+					ctx->out_ep = e;
+			}
+			break;
+
+		default:
+			break;
+		}
+	}
+}
+
+static void cdc_ncm_free(struct cdc_ncm_ctx *ctx)
+{
+	if (ctx == NULL)
+		return;
+
+	if (ctx->tx_rem_skb != NULL) {
+		dev_kfree_skb_any(ctx->tx_rem_skb);
+		ctx->tx_rem_skb = NULL;
+	}
+
+	if (ctx->tx_curr_skb != NULL) {
+		dev_kfree_skb_any(ctx->tx_curr_skb);
+		ctx->tx_curr_skb = NULL;
+	}
+
+	kfree(ctx);
+}
+
+static const struct ethtool_ops cdc_ncm_ethtool_ops = {
+	.get_drvinfo = cdc_ncm_get_drvinfo,
+	.get_link = usbnet_get_link,
+	.get_msglevel = usbnet_get_msglevel,
+	.set_msglevel = usbnet_set_msglevel,
+	.get_settings = usbnet_get_settings,
+	.set_settings = usbnet_set_settings,
+	.nway_reset = usbnet_nway_reset,
+};
+
+int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_altsetting)
+{
+	struct cdc_ncm_ctx *ctx;
+	struct usb_driver *driver;
+	u8 *buf;
+	int len;
+	int temp;
+	u8 iface_no;
+
+	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	hrtimer_init(&ctx->tx_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+	ctx->tx_timer.function = &cdc_ncm_tx_timer_cb;
+	ctx->bh.data = (unsigned long)ctx;
+	ctx->bh.func = cdc_ncm_txpath_bh;
+	atomic_set(&ctx->stop, 0);
+	spin_lock_init(&ctx->mtx);
+	ctx->netdev = dev->net;
+
+	/* store ctx pointer in device data field */
+	dev->data[0] = (unsigned long)ctx;
+
+	/* get some pointers */
+	driver = driver_of(intf);
+	buf = intf->cur_altsetting->extra;
+	len = intf->cur_altsetting->extralen;
+
+	ctx->udev = dev->udev;
+	ctx->intf = intf;
+
+	/* parse through descriptors associated with control interface */
+	while ((len > 0) && (buf[0] > 2) && (buf[0] <= len)) {
+
+		if (buf[1] != USB_DT_CS_INTERFACE)
+			goto advance;
+
+		switch (buf[2]) {
+		case USB_CDC_UNION_TYPE:
+			if (buf[0] < sizeof(*(ctx->union_desc)))
+				break;
+
+			ctx->union_desc =
+					(const struct usb_cdc_union_desc *)buf;
+
+			ctx->control = usb_ifnum_to_if(dev->udev,
+					ctx->union_desc->bMasterInterface0);
+			ctx->data = usb_ifnum_to_if(dev->udev,
+					ctx->union_desc->bSlaveInterface0);
+			break;
+
+		case USB_CDC_ETHERNET_TYPE:
+			if (buf[0] < sizeof(*(ctx->ether_desc)))
+				break;
+
+			ctx->ether_desc =
+					(const struct usb_cdc_ether_desc *)buf;
+			dev->hard_mtu =
+				le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
+
+			if (dev->hard_mtu < CDC_NCM_MIN_DATAGRAM_SIZE)
+				dev->hard_mtu =	CDC_NCM_MIN_DATAGRAM_SIZE;
+			else if (dev->hard_mtu > CDC_NCM_MAX_DATAGRAM_SIZE)
+				dev->hard_mtu =	CDC_NCM_MAX_DATAGRAM_SIZE;
+			break;
+
+		case USB_CDC_NCM_TYPE:
+			if (buf[0] < sizeof(*(ctx->func_desc)))
+				break;
+
+			ctx->func_desc = (const struct usb_cdc_ncm_desc *)buf;
+			break;
+
+		case USB_CDC_MBIM_TYPE:
+			if (buf[0] < sizeof(*(ctx->mbim_desc)))
+				break;
+
+			ctx->mbim_desc = (const struct usb_cdc_mbim_desc *)buf;
+			break;
+
+		default:
+			break;
+		}
+advance:
+		/* advance to next descriptor */
+		temp = buf[0];
+		buf += temp;
+		len -= temp;
+	}
+
+	/* some buggy devices have an IAD but no CDC Union */
+	if (!ctx->union_desc && intf->intf_assoc && intf->intf_assoc->bInterfaceCount == 2) {
+		ctx->control = intf;
+		ctx->data = usb_ifnum_to_if(dev->udev, intf->cur_altsetting->desc.bInterfaceNumber + 1);
+		dev_dbg(&intf->dev, "CDC Union missing - got slave from IAD\n");
+	}
+
+	/* check if we got everything */
+	if ((ctx->control == NULL) || (ctx->data == NULL) ||
+	    ((!ctx->mbim_desc) && ((ctx->ether_desc == NULL) || (ctx->control != intf))))
+		goto error;
+
+	/* claim data interface, if different from control */
+	if (ctx->data != ctx->control) {
+		temp = usb_driver_claim_interface(driver, ctx->data, dev);
+		if (temp)
+			goto error;
+	}
+
+	iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber;
+
+	/* reset data interface */
+	temp = usb_set_interface(dev->udev, iface_no, 0);
+	if (temp)
+		goto error2;
+
+	/* initialize data interface */
+	if (cdc_ncm_setup(ctx))
+		goto error2;
+
+	/* configure data interface */
+	temp = usb_set_interface(dev->udev, iface_no, data_altsetting);
+	if (temp)
+		goto error2;
+
+	cdc_ncm_find_endpoints(ctx, ctx->data);
+	cdc_ncm_find_endpoints(ctx, ctx->control);
+
+	if ((ctx->in_ep == NULL) || (ctx->out_ep == NULL) ||
+	    (ctx->status_ep == NULL))
+		goto error2;
+
+	dev->net->ethtool_ops = &cdc_ncm_ethtool_ops;
+
+	usb_set_intfdata(ctx->data, dev);
+	usb_set_intfdata(ctx->control, dev);
+	usb_set_intfdata(ctx->intf, dev);
+
+	if (ctx->ether_desc) {
+		temp = usbnet_get_ethernet_addr(dev, ctx->ether_desc->iMACAddress);
+		if (temp)
+			goto error2;
+		dev_info(&dev->udev->dev, "MAC-Address: %pM\n", dev->net->dev_addr);
+	}
+
+
+	dev->in = usb_rcvbulkpipe(dev->udev,
+		ctx->in_ep->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
+	dev->out = usb_sndbulkpipe(dev->udev,
+		ctx->out_ep->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
+	dev->status = ctx->status_ep;
+	dev->rx_urb_size = ctx->rx_max;
+
+	ctx->tx_speed = ctx->rx_speed = 0;
+	return 0;
+
+error2:
+	usb_set_intfdata(ctx->control, NULL);
+	usb_set_intfdata(ctx->data, NULL);
+	if (ctx->data != ctx->control)
+		usb_driver_release_interface(driver, ctx->data);
+error:
+	cdc_ncm_free((struct cdc_ncm_ctx *)dev->data[0]);
+	dev->data[0] = 0;
+	dev_info(&dev->udev->dev, "bind() failure\n");
+	return -ENODEV;
+}
+EXPORT_SYMBOL_GPL(cdc_ncm_bind_common);
+
+void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf)
+{
+	struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
+	struct usb_driver *driver = driver_of(intf);
+
+	if (ctx == NULL)
+		return;		/* no setup */
+
+	atomic_set(&ctx->stop, 1);
+
+	if (hrtimer_active(&ctx->tx_timer))
+		hrtimer_cancel(&ctx->tx_timer);
+
+	tasklet_kill(&ctx->bh);
+
+	/* handle devices with combined control and data interface */
+	if (ctx->control == ctx->data)
+		ctx->data = NULL;
+
+	/* disconnect master --> disconnect slave */
+	if (intf == ctx->control && ctx->data) {
+		usb_set_intfdata(ctx->data, NULL);
+		usb_driver_release_interface(driver, ctx->data);
+		ctx->data = NULL;
+
+	} else if (intf == ctx->data && ctx->control) {
+		usb_set_intfdata(ctx->control, NULL);
+		usb_driver_release_interface(driver, ctx->control);
+		ctx->control = NULL;
+	}
+
+	usb_set_intfdata(ctx->intf, NULL);
+	cdc_ncm_free(ctx);
+}
+EXPORT_SYMBOL_GPL(cdc_ncm_unbind);
+
+/* Select the MBIM altsetting iff it is preferred and available,
+ * returning the number of the corresponding data interface altsetting
+ */
+u8 cdc_ncm_select_altsetting(struct usbnet *dev, struct usb_interface *intf)
+{
+	struct usb_host_interface *alt;
+
+	/* The MBIM spec defines a NCM compatible default altsetting,
+	 * which we may have matched:
+	 *
+	 *  "Functions that implement both NCM 1.0 and MBIM (an
+	 *   “NCM/MBIM function”) according to this recommendation
+	 *   shall provide two alternate settings for the
+	 *   Communication Interface.  Alternate setting 0, and the
+	 *   associated class and endpoint descriptors, shall be
+	 *   constructed according to the rules given for the
+	 *   Communication Interface in section 5 of [USBNCM10].
+	 *   Alternate setting 1, and the associated class and
+	 *   endpoint descriptors, shall be constructed according to
+	 *   the rules given in section 6 (USB Device Model) of this
+	 *   specification."
+	 */
+	if (prefer_mbim && intf->num_altsetting == 2) {
+		alt = usb_altnum_to_altsetting(intf, CDC_NCM_COMM_ALTSETTING_MBIM);
+		if (alt && cdc_ncm_comm_intf_is_mbim(alt) &&
+		    !usb_set_interface(dev->udev,
+				       intf->cur_altsetting->desc.bInterfaceNumber,
+				       CDC_NCM_COMM_ALTSETTING_MBIM))
+			return CDC_NCM_DATA_ALTSETTING_MBIM;
+	}
+	return CDC_NCM_DATA_ALTSETTING_NCM;
+}
+EXPORT_SYMBOL_GPL(cdc_ncm_select_altsetting);
+
+static int cdc_ncm_bind(struct usbnet *dev, struct usb_interface *intf)
+{
+	int ret;
+
+	/* MBIM backwards compatible function? */
+	cdc_ncm_select_altsetting(dev, intf);
+	if (cdc_ncm_comm_intf_is_mbim(intf->cur_altsetting))
+		return -ENODEV;
+
+	/* NCM data altsetting is always 1 */
+	ret = cdc_ncm_bind_common(dev, intf, 1);
+
+	/*
+	 * We should get an event when network connection is "connected" or
+	 * "disconnected". Set network connection in "disconnected" state
+	 * (carrier is OFF) during attach, so the IP network stack does not
+	 * start IPv6 negotiation and more.
+	 */
+	usbnet_link_change(dev, 0, 0);
+	return ret;
+}
+
+static void cdc_ncm_align_tail(struct sk_buff *skb, size_t modulus, size_t remainder, size_t max)
+{
+	size_t align = ALIGN(skb->len, modulus) - skb->len + remainder;
+
+	if (skb->len + align > max)
+		align = max - skb->len;
+	if (align && skb_tailroom(skb) >= align)
+		memset(skb_put(skb, align), 0, align);
+}
+
+/* return a pointer to a valid struct usb_cdc_ncm_ndp16 of type sign, possibly
+ * allocating a new one within skb
+ */
+static struct usb_cdc_ncm_ndp16 *cdc_ncm_ndp(struct cdc_ncm_ctx *ctx, struct sk_buff *skb, __le32 sign, size_t reserve)
+{
+	struct usb_cdc_ncm_ndp16 *ndp16 = NULL;
+	struct usb_cdc_ncm_nth16 *nth16 = (void *)skb->data;
+	size_t ndpoffset = le16_to_cpu(nth16->wNdpIndex);
+
+	/* follow the chain of NDPs, looking for a match */
+	while (ndpoffset) {
+		ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb->data + ndpoffset);
+		if  (ndp16->dwSignature == sign)
+			return ndp16;
+		ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
+	}
+
+	/* align new NDP */
+	cdc_ncm_align_tail(skb, ctx->tx_ndp_modulus, 0, ctx->tx_max);
+
+	/* verify that there is room for the NDP and the datagram (reserve) */
+	if ((ctx->tx_max - skb->len - reserve) < CDC_NCM_NDP_SIZE)
+		return NULL;
+
+	/* link to it */
+	if (ndp16)
+		ndp16->wNextNdpIndex = cpu_to_le16(skb->len);
+	else
+		nth16->wNdpIndex = cpu_to_le16(skb->len);
+
+	/* push a new empty NDP */
+	ndp16 = (struct usb_cdc_ncm_ndp16 *)memset(skb_put(skb, CDC_NCM_NDP_SIZE), 0, CDC_NCM_NDP_SIZE);
+	ndp16->dwSignature = sign;
+	ndp16->wLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_ndp16) + sizeof(struct usb_cdc_ncm_dpe16));
+	return ndp16;
+}
+
+struct sk_buff *
+cdc_ncm_fill_tx_frame(struct cdc_ncm_ctx *ctx, struct sk_buff *skb, __le32 sign)
+{
+	struct usb_cdc_ncm_nth16 *nth16;
+	struct usb_cdc_ncm_ndp16 *ndp16;
+	struct sk_buff *skb_out;
+	u16 n = 0, index, ndplen;
+	u8 ready2send = 0;
+
+	/* if there is a remaining skb, it gets priority */
+	if (skb != NULL) {
+		swap(skb, ctx->tx_rem_skb);
+		swap(sign, ctx->tx_rem_sign);
+	} else {
+		ready2send = 1;
+	}
+
+	/* check if we are resuming an OUT skb */
+	skb_out = ctx->tx_curr_skb;
+
+	/* allocate a new OUT skb */
+	if (!skb_out) {
+		skb_out = alloc_skb((ctx->tx_max + 1), GFP_ATOMIC);
+		if (skb_out == NULL) {
+			if (skb != NULL) {
+				dev_kfree_skb_any(skb);
+				ctx->netdev->stats.tx_dropped++;
+			}
+			goto exit_no_skb;
+		}
+		/* fill out the initial 16-bit NTB header */
+		nth16 = (struct usb_cdc_ncm_nth16 *)memset(skb_put(skb_out, sizeof(struct usb_cdc_ncm_nth16)), 0, sizeof(struct usb_cdc_ncm_nth16));
+		nth16->dwSignature = cpu_to_le32(USB_CDC_NCM_NTH16_SIGN);
+		nth16->wHeaderLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_nth16));
+		nth16->wSequence = cpu_to_le16(ctx->tx_seq++);
+
+		/* count total number of frames in this NTB */
+		ctx->tx_curr_frame_num = 0;
+	}
+
+	for (n = ctx->tx_curr_frame_num; n < ctx->tx_max_datagrams; n++) {
+		/* send any remaining skb first */
+		if (skb == NULL) {
+			skb = ctx->tx_rem_skb;
+			sign = ctx->tx_rem_sign;
+			ctx->tx_rem_skb = NULL;
+
+			/* check for end of skb */
+			if (skb == NULL)
+				break;
+		}
+
+		/* get the appropriate NDP for this skb */
+		ndp16 = cdc_ncm_ndp(ctx, skb_out, sign, skb->len + ctx->tx_modulus + ctx->tx_remainder);
+
+		/* align beginning of next frame */
+		cdc_ncm_align_tail(skb_out,  ctx->tx_modulus, ctx->tx_remainder, ctx->tx_max);
+
+		/* check if we had enough room left for both NDP and frame */
+		if (!ndp16 || skb_out->len + skb->len > ctx->tx_max) {
+			if (n == 0) {
+				/* won't fit, MTU problem? */
+				dev_kfree_skb_any(skb);
+				skb = NULL;
+				ctx->netdev->stats.tx_dropped++;
+			} else {
+				/* no room for skb - store for later */
+				if (ctx->tx_rem_skb != NULL) {
+					dev_kfree_skb_any(ctx->tx_rem_skb);
+					ctx->netdev->stats.tx_dropped++;
+				}
+				ctx->tx_rem_skb = skb;
+				ctx->tx_rem_sign = sign;
+				skb = NULL;
+				ready2send = 1;
+			}
+			break;
+		}
+
+		/* calculate frame number withing this NDP */
+		ndplen = le16_to_cpu(ndp16->wLength);
+		index = (ndplen - sizeof(struct usb_cdc_ncm_ndp16)) / sizeof(struct usb_cdc_ncm_dpe16) - 1;
+
+		/* OK, add this skb */
+		ndp16->dpe16[index].wDatagramLength = cpu_to_le16(skb->len);
+		ndp16->dpe16[index].wDatagramIndex = cpu_to_le16(skb_out->len);
+		ndp16->wLength = cpu_to_le16(ndplen + sizeof(struct usb_cdc_ncm_dpe16));
+		memcpy(skb_put(skb_out, skb->len), skb->data, skb->len);
+		dev_kfree_skb_any(skb);
+		skb = NULL;
+
+		/* send now if this NDP is full */
+		if (index >= CDC_NCM_DPT_DATAGRAMS_MAX) {
+			ready2send = 1;
+			break;
+		}
+	}
+
+	/* free up any dangling skb */
+	if (skb != NULL) {
+		dev_kfree_skb_any(skb);
+		skb = NULL;
+		ctx->netdev->stats.tx_dropped++;
+	}
+
+	ctx->tx_curr_frame_num = n;
+
+	if (n == 0) {
+		/* wait for more frames */
+		/* push variables */
+		ctx->tx_curr_skb = skb_out;
+		goto exit_no_skb;
+
+	} else if ((n < ctx->tx_max_datagrams) && (ready2send == 0)) {
+		/* wait for more frames */
+		/* push variables */
+		ctx->tx_curr_skb = skb_out;
+		/* set the pending count */
+		if (n < CDC_NCM_RESTART_TIMER_DATAGRAM_CNT)
+			ctx->tx_timer_pending = CDC_NCM_TIMER_PENDING_CNT;
+		goto exit_no_skb;
+
+	} else {
+		/* frame goes out */
+		/* variables will be reset at next call */
+	}
+
+	/*
+	 * If collected data size is less or equal CDC_NCM_MIN_TX_PKT bytes,
+	 * we send buffers as it is. If we get more data, it would be more
+	 * efficient for USB HS mobile device with DMA engine to receive a full
+	 * size NTB, than canceling DMA transfer and receiving a short packet.
+	 */
+	if (skb_out->len > CDC_NCM_MIN_TX_PKT)
+		/* final zero padding */
+		memset(skb_put(skb_out, ctx->tx_max - skb_out->len), 0, ctx->tx_max - skb_out->len);
+
+	/* do we need to prevent a ZLP? */
+	if (((skb_out->len % le16_to_cpu(ctx->out_ep->desc.wMaxPacketSize)) == 0) &&
+	    (skb_out->len < le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize)) && skb_tailroom(skb_out))
+		*skb_put(skb_out, 1) = 0;	/* force short packet */
+
+	/* set final frame length */
+	nth16 = (struct usb_cdc_ncm_nth16 *)skb_out->data;
+	nth16->wBlockLength = cpu_to_le16(skb_out->len);
+
+	/* return skb */
+	ctx->tx_curr_skb = NULL;
+	ctx->netdev->stats.tx_packets += ctx->tx_curr_frame_num;
+	return skb_out;
+
+exit_no_skb:
+	/* Start timer, if there is a remaining skb */
+	if (ctx->tx_curr_skb != NULL)
+		cdc_ncm_tx_timeout_start(ctx);
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(cdc_ncm_fill_tx_frame);
+
+static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx)
+{
+	/* start timer, if not already started */
+	if (!(hrtimer_active(&ctx->tx_timer) || atomic_read(&ctx->stop)))
+		hrtimer_start(&ctx->tx_timer,
+				ktime_set(0, CDC_NCM_TIMER_INTERVAL),
+				HRTIMER_MODE_REL);
+}
+
+static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *timer)
+{
+	struct cdc_ncm_ctx *ctx =
+			container_of(timer, struct cdc_ncm_ctx, tx_timer);
+
+	if (!atomic_read(&ctx->stop))
+		tasklet_schedule(&ctx->bh);
+	return HRTIMER_NORESTART;
+}
+
+static void cdc_ncm_txpath_bh(unsigned long param)
+{
+	struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)param;
+
+	spin_lock_bh(&ctx->mtx);
+	if (ctx->tx_timer_pending != 0) {
+		ctx->tx_timer_pending--;
+		cdc_ncm_tx_timeout_start(ctx);
+		spin_unlock_bh(&ctx->mtx);
+	} else if (ctx->netdev != NULL) {
+		spin_unlock_bh(&ctx->mtx);
+		netif_tx_lock_bh(ctx->netdev);
+		usbnet_start_xmit(NULL, ctx->netdev);
+		netif_tx_unlock_bh(ctx->netdev);
+	} else {
+		spin_unlock_bh(&ctx->mtx);
+	}
+}
+
+static struct sk_buff *
+cdc_ncm_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
+{
+	struct sk_buff *skb_out;
+	struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
+
+	/*
+	 * The Ethernet API we are using does not support transmitting
+	 * multiple Ethernet frames in a single call. This driver will
+	 * accumulate multiple Ethernet frames and send out a larger
+	 * USB frame when the USB buffer is full or when a single jiffies
+	 * timeout happens.
+	 */
+	if (ctx == NULL)
+		goto error;
+
+	spin_lock_bh(&ctx->mtx);
+	skb_out = cdc_ncm_fill_tx_frame(ctx, skb, cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN));
+	spin_unlock_bh(&ctx->mtx);
+	return skb_out;
+
+error:
+	if (skb != NULL)
+		dev_kfree_skb_any(skb);
+
+	return NULL;
+}
+
+/* verify NTB header and return offset of first NDP, or negative error */
+int cdc_ncm_rx_verify_nth16(struct cdc_ncm_ctx *ctx, struct sk_buff *skb_in)
+{
+	struct usb_cdc_ncm_nth16 *nth16;
+	int len;
+	int ret = -EINVAL;
+
+	if (ctx == NULL)
+		goto error;
+
+	if (skb_in->len < (sizeof(struct usb_cdc_ncm_nth16) +
+					sizeof(struct usb_cdc_ncm_ndp16))) {
+		pr_debug("frame too short\n");
+		goto error;
+	}
+
+	nth16 = (struct usb_cdc_ncm_nth16 *)skb_in->data;
+
+	if (le32_to_cpu(nth16->dwSignature) != USB_CDC_NCM_NTH16_SIGN) {
+		pr_debug("invalid NTH16 signature <%u>\n",
+					le32_to_cpu(nth16->dwSignature));
+		goto error;
+	}
+
+	len = le16_to_cpu(nth16->wBlockLength);
+	if (len > ctx->rx_max) {
+		pr_debug("unsupported NTB block length %u/%u\n", len,
+								ctx->rx_max);
+		goto error;
+	}
+
+	if ((ctx->rx_seq + 1) != le16_to_cpu(nth16->wSequence) &&
+		(ctx->rx_seq || le16_to_cpu(nth16->wSequence)) &&
+		!((ctx->rx_seq == 0xffff) && !le16_to_cpu(nth16->wSequence))) {
+		pr_debug("sequence number glitch prev=%d curr=%d\n",
+				ctx->rx_seq, le16_to_cpu(nth16->wSequence));
+	}
+	ctx->rx_seq = le16_to_cpu(nth16->wSequence);
+
+	ret = le16_to_cpu(nth16->wNdpIndex);
+error:
+	return ret;
+}
+EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_nth16);
+
+/* verify NDP header and return number of datagrams, or negative error */
+int cdc_ncm_rx_verify_ndp16(struct sk_buff *skb_in, int ndpoffset)
+{
+	struct usb_cdc_ncm_ndp16 *ndp16;
+	int ret = -EINVAL;
+
+	if ((ndpoffset + sizeof(struct usb_cdc_ncm_ndp16)) > skb_in->len) {
+		pr_debug("invalid NDP offset  <%u>\n", ndpoffset);
+		goto error;
+	}
+	ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
+
+	if (le16_to_cpu(ndp16->wLength) < USB_CDC_NCM_NDP16_LENGTH_MIN) {
+		pr_debug("invalid DPT16 length <%u>\n",
+					le32_to_cpu(ndp16->dwSignature));
+		goto error;
+	}
+
+	ret = ((le16_to_cpu(ndp16->wLength) -
+					sizeof(struct usb_cdc_ncm_ndp16)) /
+					sizeof(struct usb_cdc_ncm_dpe16));
+	ret--; /* we process NDP entries except for the last one */
+
+	if ((sizeof(struct usb_cdc_ncm_ndp16) + ret * (sizeof(struct usb_cdc_ncm_dpe16))) >
+								skb_in->len) {
+		pr_debug("Invalid nframes = %d\n", ret);
+		ret = -EINVAL;
+	}
+
+error:
+	return ret;
+}
+EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_ndp16);
+
+static int cdc_ncm_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in)
+{
+	struct sk_buff *skb;
+	struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
+	int len;
+	int nframes;
+	int x;
+	int offset;
+	struct usb_cdc_ncm_ndp16 *ndp16;
+	struct usb_cdc_ncm_dpe16 *dpe16;
+	int ndpoffset;
+	int loopcount = 50; /* arbitrary max preventing infinite loop */
+
+	ndpoffset = cdc_ncm_rx_verify_nth16(ctx, skb_in);
+	if (ndpoffset < 0)
+		goto error;
+
+next_ndp:
+	nframes = cdc_ncm_rx_verify_ndp16(skb_in, ndpoffset);
+	if (nframes < 0)
+		goto error;
+
+	ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
+
+	if (le32_to_cpu(ndp16->dwSignature) != USB_CDC_NCM_NDP16_NOCRC_SIGN) {
+		pr_debug("invalid DPT16 signature <%u>\n",
+			 le32_to_cpu(ndp16->dwSignature));
+		goto err_ndp;
+	}
+	dpe16 = ndp16->dpe16;
+
+	for (x = 0; x < nframes; x++, dpe16++) {
+		offset = le16_to_cpu(dpe16->wDatagramIndex);
+		len = le16_to_cpu(dpe16->wDatagramLength);
+
+		/*
+		 * CDC NCM ch. 3.7
+		 * All entries after first NULL entry are to be ignored
+		 */
+		if ((offset == 0) || (len == 0)) {
+			if (!x)
+				goto err_ndp; /* empty NTB */
+			break;
+		}
+
+		/* sanity checking */
+		if (((offset + len) > skb_in->len) ||
+				(len > ctx->rx_max) || (len < ETH_HLEN)) {
+			pr_debug("invalid frame detected (ignored)"
+					"offset[%u]=%u, length=%u, skb=%p\n",
+					x, offset, len, skb_in);
+			if (!x)
+				goto err_ndp;
+			break;
+
+		} else {
+			skb = skb_clone(skb_in, GFP_ATOMIC);
+			if (!skb)
+				goto error;
+			skb->len = len;
+			skb->data = ((u8 *)skb_in->data) + offset;
+			skb_set_tail_pointer(skb, len);
+			usbnet_skb_return(dev, skb);
+		}
+	}
+err_ndp:
+	/* are there more NDPs to process? */
+	ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
+	if (ndpoffset && loopcount--)
+		goto next_ndp;
+
+	return 1;
+error:
+	return 0;
+}
+
+static void
+cdc_ncm_speed_change(struct cdc_ncm_ctx *ctx,
+		     struct usb_cdc_speed_change *data)
+{
+	uint32_t rx_speed = le32_to_cpu(data->DLBitRRate);
+	uint32_t tx_speed = le32_to_cpu(data->ULBitRate);
+
+	/*
+	 * Currently the USB-NET API does not support reporting the actual
+	 * device speed. Do print it instead.
+	 */
+	if ((tx_speed != ctx->tx_speed) || (rx_speed != ctx->rx_speed)) {
+		ctx->tx_speed = tx_speed;
+		ctx->rx_speed = rx_speed;
+
+		if ((tx_speed > 1000000) && (rx_speed > 1000000)) {
+			printk(KERN_INFO KBUILD_MODNAME
+				": %s: %u mbit/s downlink "
+				"%u mbit/s uplink\n",
+				ctx->netdev->name,
+				(unsigned int)(rx_speed / 1000000U),
+				(unsigned int)(tx_speed / 1000000U));
+		} else {
+			printk(KERN_INFO KBUILD_MODNAME
+				": %s: %u kbit/s downlink "
+				"%u kbit/s uplink\n",
+				ctx->netdev->name,
+				(unsigned int)(rx_speed / 1000U),
+				(unsigned int)(tx_speed / 1000U));
+		}
+	}
+}
+
+static void cdc_ncm_status(struct usbnet *dev, struct urb *urb)
+{
+	struct cdc_ncm_ctx *ctx;
+	struct usb_cdc_notification *event;
+
+	ctx = (struct cdc_ncm_ctx *)dev->data[0];
+
+	if (urb->actual_length < sizeof(*event))
+		return;
+
+	/* test for split data in 8-byte chunks */
+	if (test_and_clear_bit(EVENT_STS_SPLIT, &dev->flags)) {
+		cdc_ncm_speed_change(ctx,
+		      (struct usb_cdc_speed_change *)urb->transfer_buffer);
+		return;
+	}
+
+	event = urb->transfer_buffer;
+
+	switch (event->bNotificationType) {
+	case USB_CDC_NOTIFY_NETWORK_CONNECTION:
+		/*
+		 * According to the CDC NCM specification ch.7.1
+		 * USB_CDC_NOTIFY_NETWORK_CONNECTION notification shall be
+		 * sent by device after USB_CDC_NOTIFY_SPEED_CHANGE.
+		 */
+		ctx->connected = le16_to_cpu(event->wValue);
+
+		printk(KERN_INFO KBUILD_MODNAME ": %s: network connection:"
+			" %sconnected\n",
+			ctx->netdev->name, ctx->connected ? "" : "dis");
+
+		usbnet_link_change(dev, ctx->connected, 0);
+		if (!ctx->connected)
+			ctx->tx_speed = ctx->rx_speed = 0;
+		break;
+
+	case USB_CDC_NOTIFY_SPEED_CHANGE:
+		if (urb->actual_length < (sizeof(*event) +
+					sizeof(struct usb_cdc_speed_change)))
+			set_bit(EVENT_STS_SPLIT, &dev->flags);
+		else
+			cdc_ncm_speed_change(ctx,
+				(struct usb_cdc_speed_change *) &event[1]);
+		break;
+
+	default:
+		dev_dbg(&dev->udev->dev,
+			"NCM: unexpected notification 0x%02x!\n",
+			event->bNotificationType);
+		break;
+	}
+}
+
+static int cdc_ncm_check_connect(struct usbnet *dev)
+{
+	struct cdc_ncm_ctx *ctx;
+
+	ctx = (struct cdc_ncm_ctx *)dev->data[0];
+	if (ctx == NULL)
+		return 1;	/* disconnected */
+
+	return !ctx->connected;
+}
+
+static int
+cdc_ncm_probe(struct usb_interface *udev, const struct usb_device_id *prod)
+{
+	return usbnet_probe(udev, prod);
+}
+
+static void cdc_ncm_disconnect(struct usb_interface *intf)
+{
+	struct usbnet *dev = usb_get_intfdata(intf);
+
+	if (dev == NULL)
+		return;		/* already disconnected */
+
+	usbnet_disconnect(intf);
+}
+
+static const struct driver_info cdc_ncm_info = {
+	.description = "CDC NCM",
+	.flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET,
+	.bind = cdc_ncm_bind,
+	.unbind = cdc_ncm_unbind,
+	.check_connect = cdc_ncm_check_connect,
+	.manage_power = usbnet_manage_power,
+	.status = cdc_ncm_status,
+	.rx_fixup = cdc_ncm_rx_fixup,
+	.tx_fixup = cdc_ncm_tx_fixup,
+};
+
+/* Same as cdc_ncm_info, but with FLAG_WWAN */
+static const struct driver_info wwan_info = {
+	.description = "Mobile Broadband Network Device",
+	.flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
+			| FLAG_WWAN,
+	.bind = cdc_ncm_bind,
+	.unbind = cdc_ncm_unbind,
+	.check_connect = cdc_ncm_check_connect,
+	.manage_power = usbnet_manage_power,
+	.status = cdc_ncm_status,
+	.rx_fixup = cdc_ncm_rx_fixup,
+	.tx_fixup = cdc_ncm_tx_fixup,
+};
+
+/* Same as wwan_info, but with FLAG_NOARP  */
+static const struct driver_info wwan_noarp_info = {
+	.description = "Mobile Broadband Network Device (NO ARP)",
+	.flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
+			| FLAG_WWAN | FLAG_NOARP,
+	.bind = cdc_ncm_bind,
+	.unbind = cdc_ncm_unbind,
+	.check_connect = cdc_ncm_check_connect,
+	.manage_power = usbnet_manage_power,
+	.status = cdc_ncm_status,
+	.rx_fixup = cdc_ncm_rx_fixup,
+	.tx_fixup = cdc_ncm_tx_fixup,
+};
+
+static const struct usb_device_id cdc_devs[] = {
+	/* Ericsson MBM devices like F5521gw */
+	{ .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
+		| USB_DEVICE_ID_MATCH_VENDOR,
+	  .idVendor = 0x0bdb,
+	  .bInterfaceClass = USB_CLASS_COMM,
+	  .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
+	  .bInterfaceProtocol = USB_CDC_PROTO_NONE,
+	  .driver_info = (unsigned long) &wwan_info,
+	},
+
+	/* Dell branded MBM devices like DW5550 */
+	{ .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
+		| USB_DEVICE_ID_MATCH_VENDOR,
+	  .idVendor = 0x413c,
+	  .bInterfaceClass = USB_CLASS_COMM,
+	  .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
+	  .bInterfaceProtocol = USB_CDC_PROTO_NONE,
+	  .driver_info = (unsigned long) &wwan_info,
+	},
+
+	/* Toshiba branded MBM devices */
+	{ .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
+		| USB_DEVICE_ID_MATCH_VENDOR,
+	  .idVendor = 0x0930,
+	  .bInterfaceClass = USB_CLASS_COMM,
+	  .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
+	  .bInterfaceProtocol = USB_CDC_PROTO_NONE,
+	  .driver_info = (unsigned long) &wwan_info,
+	},
+
+	/* tag Huawei devices as wwan */
+	{ USB_VENDOR_AND_INTERFACE_INFO(0x12d1,
+					USB_CLASS_COMM,
+					USB_CDC_SUBCLASS_NCM,
+					USB_CDC_PROTO_NONE),
+	  .driver_info = (unsigned long)&wwan_info,
+	},
+
+	/* Huawei NCM devices disguised as vendor specific */
+	{ USB_VENDOR_AND_INTERFACE_INFO(0x12d1, 0xff, 0x02, 0x16),
+	  .driver_info = (unsigned long)&wwan_info,
+	},
+	{ USB_VENDOR_AND_INTERFACE_INFO(0x12d1, 0xff, 0x02, 0x46),
+	  .driver_info = (unsigned long)&wwan_info,
+	},
+	{ USB_VENDOR_AND_INTERFACE_INFO(0x12d1, 0xff, 0x02, 0x76),
+	  .driver_info = (unsigned long)&wwan_info,
+	},
+
+	/* Infineon(now Intel) HSPA Modem platform */
+	{ USB_DEVICE_AND_INTERFACE_INFO(0x1519, 0x0443,
+		USB_CLASS_COMM,
+		USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
+	  .driver_info = (unsigned long)&wwan_noarp_info,
+	},
+
+	/* Generic CDC-NCM devices */
+	{ USB_INTERFACE_INFO(USB_CLASS_COMM,
+		USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
+		.driver_info = (unsigned long)&cdc_ncm_info,
+	},
+	{
+	},
+};
+MODULE_DEVICE_TABLE(usb, cdc_devs);
+
+static struct usb_driver cdc_ncm_driver = {
+	.name = "cdc_ncm",
+	.id_table = cdc_devs,
+	.probe = cdc_ncm_probe,
+	.disconnect = cdc_ncm_disconnect,
+	.suspend = usbnet_suspend,
+	.resume = usbnet_resume,
+	.reset_resume =	usbnet_resume,
+	.supports_autosuspend = 1,
+	.disable_hub_initiated_lpm = 1,
+};
+
+module_usb_driver(cdc_ncm_driver);
+
+MODULE_AUTHOR("Hans Petter Selasky");
+MODULE_DESCRIPTION("USB CDC NCM host driver");
+MODULE_LICENSE("Dual BSD/GPL");