/*
 * 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/sched/signal.h>
#include <linux/netdevice.h>
#include <linux/ethtool.h>
#include <linux/etherdevice.h>
#include <linux/if_arp.h>
#include <linux/mii.h>
#include <linux/rtnetlink.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 flags;
        struct usb_interface *control;
        struct usb_interface *data;
};

enum qmi_wwan_flags {
        QMI_WWAN_FLAG_RAWIP = 1 << 0,
        QMI_WWAN_FLAG_MUX = 1 << 1,
};

enum qmi_wwan_quirks {
        QMI_WWAN_QUIRK_DTR = 1 << 0,    /* needs "set DTR" request */
};

struct qmimux_hdr {
        u8 pad;
        u8 mux_id;
        __be16 pkt_len;
};

struct qmimux_priv {
        struct net_device *real_dev;
        u8 mux_id;
};

static int qmimux_open(struct net_device *dev)
{
        struct qmimux_priv *priv = netdev_priv(dev);
        struct net_device *real_dev = priv->real_dev;

        if (!(priv->real_dev->flags & IFF_UP))
                return -ENETDOWN;

        if (netif_carrier_ok(real_dev))
                netif_carrier_on(dev);
        return 0;
}

static int qmimux_stop(struct net_device *dev)
{
        netif_carrier_off(dev);
        return 0;
}

static netdev_tx_t qmimux_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
        struct qmimux_priv *priv = netdev_priv(dev);
        unsigned int len = skb->len;
        struct qmimux_hdr *hdr;

        hdr = skb_push(skb, sizeof(struct qmimux_hdr));
        hdr->pad = 0;
        hdr->mux_id = priv->mux_id;
        hdr->pkt_len = cpu_to_be16(len);
        skb->dev = priv->real_dev;
        return dev_queue_xmit(skb);
}

static const struct net_device_ops qmimux_netdev_ops = {
        .ndo_open       = qmimux_open,
        .ndo_stop       = qmimux_stop,
        .ndo_start_xmit = qmimux_start_xmit,
};

static void qmimux_setup(struct net_device *dev)
{
        dev->header_ops      = NULL;  /* No header */
        dev->type            = ARPHRD_NONE;
        dev->hard_header_len = 0;
        dev->addr_len        = 0;
        dev->flags           = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
        dev->netdev_ops      = &qmimux_netdev_ops;
        dev->needs_free_netdev = true;
}

static struct net_device *qmimux_find_dev(struct usbnet *dev, u8 mux_id)
{
        struct qmimux_priv *priv;
        struct list_head *iter;
        struct net_device *ldev;

        rcu_read_lock();
        netdev_for_each_upper_dev_rcu(dev->net, ldev, iter) {
                priv = netdev_priv(ldev);
                if (priv->mux_id == mux_id) {
                        rcu_read_unlock();
                        return ldev;
                }
        }
        rcu_read_unlock();
        return NULL;
}

static bool qmimux_has_slaves(struct usbnet *dev)
{
        return !list_empty(&dev->net->adj_list.upper);
}

static int qmimux_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
{
        unsigned int len, offset = sizeof(struct qmimux_hdr);
        struct qmimux_hdr *hdr;
        struct net_device *net;
        struct sk_buff *skbn;

        while (offset < skb->len) {
                hdr = (struct qmimux_hdr *)skb->data;
                len = be16_to_cpu(hdr->pkt_len);

                /* drop the packet, bogus length */
                if (offset + len > skb->len)
                        return 0;

                /* control packet, we do not know what to do */
                if (hdr->pad & 0x80)
                        goto skip;

                net = qmimux_find_dev(dev, hdr->mux_id);
                if (!net)
                        goto skip;
                skbn = netdev_alloc_skb(net, len);
                if (!skbn)
                        return 0;
                skbn->dev = net;

                switch (skb->data[offset] & 0xf0) {
                case 0x40:
                        skbn->protocol = htons(ETH_P_IP);
                        break;
                case 0x60:
                        skbn->protocol = htons(ETH_P_IPV6);
                        break;
                default:
                        /* not ip - do not know what to do */
                        goto skip;
                }

                skb_put_data(skbn, skb->data + offset, len);
                if (netif_rx(skbn) != NET_RX_SUCCESS)
                        return 0;

skip:
                offset += len + sizeof(struct qmimux_hdr);
        }
        return 1;
}

static int qmimux_register_device(struct net_device *real_dev, u8 mux_id)
{
        struct net_device *new_dev;
        struct qmimux_priv *priv;
        int err;

        new_dev = alloc_netdev(sizeof(struct qmimux_priv),
                               "qmimux%d", NET_NAME_UNKNOWN, qmimux_setup);
        if (!new_dev)
                return -ENOBUFS;

        dev_net_set(new_dev, dev_net(real_dev));
        priv = netdev_priv(new_dev);
        priv->mux_id = mux_id;
        priv->real_dev = real_dev;

        err = register_netdevice(new_dev);
        if (err < 0)
                goto out_free_newdev;

        /* Account for reference in struct qmimux_priv_priv */
        dev_hold(real_dev);

        err = netdev_upper_dev_link(real_dev, new_dev, NULL);
        if (err)
                goto out_unregister_netdev;

        netif_stacked_transfer_operstate(real_dev, new_dev);

        return 0;

out_unregister_netdev:
        unregister_netdevice(new_dev);
        dev_put(real_dev);

out_free_newdev:
        free_netdev(new_dev);
        return err;
}

static void qmimux_unregister_device(struct net_device *dev)
{
        struct qmimux_priv *priv = netdev_priv(dev);
        struct net_device *real_dev = priv->real_dev;

        netdev_upper_dev_unlink(real_dev, dev);
        unregister_netdevice(dev);

        /* Get rid of the reference to real_dev */
        dev_put(real_dev);
}

static void qmi_wwan_netdev_setup(struct net_device *net)
{
        struct usbnet *dev = netdev_priv(net);
        struct qmi_wwan_state *info = (void *)&dev->data;

        if (info->flags & QMI_WWAN_FLAG_RAWIP) {
                net->header_ops      = NULL;  /* No header */
                net->type            = ARPHRD_NONE;
                net->hard_header_len = 0;
                net->addr_len        = 0;
                net->flags           = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
                set_bit(EVENT_NO_IP_ALIGN, &dev->flags);
                netdev_dbg(net, "mode: raw IP\n");
        } else if (!net->header_ops) { /* don't bother if already set */
                ether_setup(net);
                clear_bit(EVENT_NO_IP_ALIGN, &dev->flags);
                netdev_dbg(net, "mode: Ethernet\n");
        }

        /* recalculate buffers after changing hard_header_len */
        usbnet_change_mtu(net, net->mtu);
}

static ssize_t raw_ip_show(struct device *d, struct device_attribute *attr, char *buf)
{
        struct usbnet *dev = netdev_priv(to_net_dev(d));
        struct qmi_wwan_state *info = (void *)&dev->data;

        return sprintf(buf, "%c\n", info->flags & QMI_WWAN_FLAG_RAWIP ? 'Y' : 'N');
}

static ssize_t raw_ip_store(struct device *d,  struct device_attribute *attr, const char *buf, size_t len)
{
        struct usbnet *dev = netdev_priv(to_net_dev(d));
        struct qmi_wwan_state *info = (void *)&dev->data;
        bool enable;
        int ret;

        if (strtobool(buf, &enable))
                return -EINVAL;

        /* no change? */
        if (enable == (info->flags & QMI_WWAN_FLAG_RAWIP))
                return len;

        if (!rtnl_trylock())
                return restart_syscall();

        /* we don't want to modify a running netdev */
        if (netif_running(dev->net)) {
                netdev_err(dev->net, "Cannot change a running device\n");
                ret = -EBUSY;
                goto err;
        }

        /* let other drivers deny the change */
        ret = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE, dev->net);
        ret = notifier_to_errno(ret);
        if (ret) {
                netdev_err(dev->net, "Type change was refused\n");
                goto err;
        }

        if (enable)
                info->flags |= QMI_WWAN_FLAG_RAWIP;
        else
                info->flags &= ~QMI_WWAN_FLAG_RAWIP;
        qmi_wwan_netdev_setup(dev->net);
        call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev->net);
        ret = len;
err:
        rtnl_unlock();
        return ret;
}

static ssize_t add_mux_show(struct device *d, struct device_attribute *attr, char *buf)
{
        struct net_device *dev = to_net_dev(d);
        struct qmimux_priv *priv;
        struct list_head *iter;
        struct net_device *ldev;
        ssize_t count = 0;

        rcu_read_lock();
        netdev_for_each_upper_dev_rcu(dev, ldev, iter) {
                priv = netdev_priv(ldev);
                count += scnprintf(&buf[count], PAGE_SIZE - count,
                                   "0x%02x\n", priv->mux_id);
        }
        rcu_read_unlock();
        return count;
}

static ssize_t add_mux_store(struct device *d,  struct device_attribute *attr, const char *buf, size_t len)
{
        struct usbnet *dev = netdev_priv(to_net_dev(d));
        struct qmi_wwan_state *info = (void *)&dev->data;
        u8 mux_id;
        int ret;

        if (kstrtou8(buf, 0, &mux_id))
                return -EINVAL;

        /* mux_id [1 - 0x7f] range empirically found */
        if (mux_id < 1 || mux_id > 0x7f)
                return -EINVAL;

        if (!rtnl_trylock())
                return restart_syscall();

        if (qmimux_find_dev(dev, mux_id)) {
                netdev_err(dev->net, "mux_id already present\n");
                ret = -EINVAL;
                goto err;
        }

        /* we don't want to modify a running netdev */
        if (netif_running(dev->net)) {
                netdev_err(dev->net, "Cannot change a running device\n");
                ret = -EBUSY;
                goto err;
        }

        ret = qmimux_register_device(dev->net, mux_id);
        if (!ret) {
                info->flags |= QMI_WWAN_FLAG_MUX;
                ret = len;
        }
err:
        rtnl_unlock();
        return ret;
}

static ssize_t del_mux_show(struct device *d, struct device_attribute *attr, char *buf)
{
        return add_mux_show(d, attr, buf);
}

static ssize_t del_mux_store(struct device *d,  struct device_attribute *attr, const char *buf, size_t len)
{
        struct usbnet *dev = netdev_priv(to_net_dev(d));
        struct qmi_wwan_state *info = (void *)&dev->data;
        struct net_device *del_dev;
        u8 mux_id;
        int ret = 0;

        if (kstrtou8(buf, 0, &mux_id))
                return -EINVAL;

        if (!rtnl_trylock())
                return restart_syscall();

        /* we don't want to modify a running netdev */
        if (netif_running(dev->net)) {
                netdev_err(dev->net, "Cannot change a running device\n");
                ret = -EBUSY;
                goto err;
        }

        del_dev = qmimux_find_dev(dev, mux_id);
        if (!del_dev) {
                netdev_err(dev->net, "mux_id not present\n");
                ret = -EINVAL;
                goto err;
        }
        qmimux_unregister_device(del_dev);

        if (!qmimux_has_slaves(dev))
                info->flags &= ~QMI_WWAN_FLAG_MUX;
        ret = len;
err:
        rtnl_unlock();
        return ret;
}

static DEVICE_ATTR_RW(raw_ip);
static DEVICE_ATTR_RW(add_mux);
static DEVICE_ATTR_RW(del_mux);

static struct attribute *qmi_wwan_sysfs_attrs[] = {
        &dev_attr_raw_ip.attr,
        &dev_attr_add_mux.attr,
        &dev_attr_del_mux.attr,
        NULL,
};

static struct attribute_group qmi_wwan_sysfs_attr_group = {
        .name = "qmi",
        .attrs = qmi_wwan_sysfs_attrs,
};

/* default ethernet address used by the modem */
static const u8 default_modem_addr[ETH_ALEN] = {0x02, 0x50, 0xf3};

static const u8 buggy_fw_addr[ETH_ALEN] = {0x00, 0xa0, 0xc6, 0x00, 0x00, 0x00};

/* Make up an ethernet header if the packet doesn't have one.
 *
 * A firmware bug common among several devices cause them to send raw
 * IP packets under some circumstances.  There is no way for the
 * driver/host to know when this will happen.  And even when the bug
 * hits, some packets will still arrive with an intact header.
 *
 * The supported devices are only capably of sending IPv4, IPv6 and
 * ARP packets on a point-to-point link. Any packet with an ethernet
 * header will have either our address or a broadcast/multicast
 * address as destination.  ARP packets will always have a header.
 *
 * This means that this function will reliably add the appropriate
 * header iff necessary, provided our hardware address does not start
 * with 4 or 6.
 *
 * Another common firmware bug results in all packets being addressed
 * to 00:a0:c6:00:00:00 despite the host address being different.
 * This function will also fixup such packets.
 */
static int qmi_wwan_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
{
        struct qmi_wwan_state *info = (void *)&dev->data;
        bool rawip = info->flags & QMI_WWAN_FLAG_RAWIP;
        __be16 proto;

        /* This check is no longer done by usbnet */
        if (skb->len < dev->net->hard_header_len)
                return 0;

        if (info->flags & QMI_WWAN_FLAG_MUX)
                return qmimux_rx_fixup(dev, skb);

        switch (skb->data[0] & 0xf0) {
        case 0x40:
                proto = htons(ETH_P_IP);
                break;
        case 0x60:
                proto = htons(ETH_P_IPV6);
                break;
        case 0x00:
                if (rawip)
                        return 0;
                if (is_multicast_ether_addr(skb->data))
                        return 1;
                /* possibly bogus destination - rewrite just in case */
                skb_reset_mac_header(skb);
                goto fix_dest;
        default:
                if (rawip)
                        return 0;
                /* pass along other packets without modifications */
                return 1;
        }
        if (rawip) {
                skb_reset_mac_header(skb);
                skb->dev = dev->net; /* normally set by eth_type_trans */
                skb->protocol = proto;
                return 1;
        }

        if (skb_headroom(skb) < ETH_HLEN)
                return 0;
        skb_push(skb, ETH_HLEN);
        skb_reset_mac_header(skb);
        eth_hdr(skb)->h_proto = proto;
        eth_zero_addr(eth_hdr(skb)->h_source);
fix_dest:
        memcpy(eth_hdr(skb)->h_dest, dev->net->dev_addr, ETH_ALEN);
        return 1;
}

/* very simplistic detection of IPv4 or IPv6 headers */
static bool possibly_iphdr(const char *data)
{
        return (data[0] & 0xd0) == 0x40;
}

/* disallow addresses which may be confused with IP headers */
static int qmi_wwan_mac_addr(struct net_device *dev, void *p)
{
        int ret;
        struct sockaddr *addr = p;

        ret = eth_prepare_mac_addr_change(dev, p);
        if (ret < 0)
                return ret;
        if (possibly_iphdr(addr->sa_data))
                return -EADDRNOTAVAIL;
        eth_commit_mac_addr_change(dev, p);
        return 0;
}

static const struct net_device_ops qmi_wwan_netdev_ops = {
        .ndo_open               = usbnet_open,
        .ndo_stop               = usbnet_stop,
        .ndo_start_xmit         = usbnet_start_xmit,
        .ndo_tx_timeout         = usbnet_tx_timeout,
        .ndo_change_mtu         = usbnet_change_mtu,
        .ndo_get_stats64        = usbnet_get_stats64,
        .ndo_set_mac_address    = qmi_wwan_mac_addr,
        .ndo_validate_addr      = eth_validate_addr,
};

/* 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;

        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);
                dev->intf->needs_remote_wakeup = on;
                if (!rv)
                        usb_autopm_put_interface(dev->intf);
        }
        return 0;
}

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,
                                         4096, &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;
}

/* Send CDC SetControlLineState request, setting or clearing the DTR.
 * "Required for Autoconnect and 9x30 to wake up" according to the
 * GobiNet driver. The requirement has been verified on an MDM9230
 * based Sierra Wireless MC7455
 */
static int qmi_wwan_change_dtr(struct usbnet *dev, bool on)
{
        u8 intf = dev->intf->cur_altsetting->desc.bInterfaceNumber;

        return usbnet_write_cmd(dev, USB_CDC_REQ_SET_CONTROL_LINE_STATE,
                                USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
                                on ? 0x01 : 0x00, intf, NULL, 0);
}

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;
        struct usb_cdc_ether_desc *cdc_ether;
        struct usb_driver *driver = driver_of(intf);
        struct qmi_wwan_state *info = (void *)&dev->data;
        struct usb_cdc_parsed_header hdr;

        BUILD_BUG_ON((sizeof(((struct usbnet *)0)->data) <
                      sizeof(struct qmi_wwan_state)));

        /* set up initial state */
        info->control = intf;
        info->data = intf;

        /* and a number of CDC descriptors */
        cdc_parse_cdc_header(&hdr, intf, buf, len);
        cdc_union = hdr.usb_cdc_union_desc;
        cdc_ether = hdr.usb_cdc_ether_desc;

        /* Use separate control and data interfaces if we found a CDC Union */
        if (cdc_union) {
                info->data = usb_ifnum_to_if(dev->udev,
                                             cdc_union->bSlaveInterface0);
                if (desc->bInterfaceNumber != cdc_union->bMasterInterface0 ||
                    !info->data) {
                        dev_err(&intf->dev,
                                "bogus CDC Union: master=%u, slave=%u\n",
                                cdc_union->bMasterInterface0,
                                cdc_union->bSlaveInterface0);

                        /* ignore and continue... */
                        cdc_union = NULL;
                        info->data = intf;
                }
        }

        /* errors aren't fatal - we can live with the dynamic address */
        if (cdc_ether && cdc_ether->wMaxSegmentSize) {
                dev->hard_mtu = le16_to_cpu(cdc_ether->wMaxSegmentSize);
                usbnet_get_ethernet_addr(dev, cdc_ether->iMACAddress);
        }

        /* claim data interface and set it up */
        if (info->control != info->data) {
                status = usb_driver_claim_interface(driver, info->data, dev);
                if (status < 0)
                        goto err;
        }

        status = qmi_wwan_register_subdriver(dev);
        if (status < 0 && info->control != info->data) {
                usb_set_intfdata(info->data, NULL);
                usb_driver_release_interface(driver, info->data);
        }

        /* disabling remote wakeup on MDM9x30 devices has the same
         * effect as clearing DTR. The device will not respond to QMI
         * requests until we set DTR again.  This is similar to a
         * QMI_CTL SYNC request, clearing a lot of firmware state
         * including the client ID allocations.
         *
         * Our usage model allows a session to span multiple
         * open/close events, so we must prevent the firmware from
         * clearing out state the clients might need.
         *
         * MDM9x30 is the first QMI chipset with USB3 support. Abuse
         * this fact to enable the quirk for all USB3 devices.
         *
         * There are also chipsets with the same "set DTR" requirement
         * but without USB3 support.  Devices based on these chips
         * need a quirk flag in the device ID table.
         */
        if (dev->driver_info->data & QMI_WWAN_QUIRK_DTR ||
            le16_to_cpu(dev->udev->descriptor.bcdUSB) >= 0x0201) {
                qmi_wwan_manage_power(dev, 1);
                qmi_wwan_change_dtr(dev, true);
        }

        /* Never use the same address on both ends of the link, even if the
         * buggy firmware told us to. Or, if device is assigned the well-known
         * buggy firmware MAC address, replace it with a random address,
         */
        if (ether_addr_equal(dev->net->dev_addr, default_modem_addr) ||
            ether_addr_equal(dev->net->dev_addr, buggy_fw_addr))
                eth_hw_addr_random(dev->net);

        /* make MAC addr easily distinguishable from an IP header */
        if (possibly_iphdr(dev->net->dev_addr)) {
                dev->net->dev_addr[0] |= 0x02;  /* set local assignment bit */
                dev->net->dev_addr[0] &= 0xbf;  /* clear "IP" bit */
        }
        dev->net->netdev_ops = &qmi_wwan_netdev_ops;
        dev->net->sysfs_groups[0] = &qmi_wwan_sysfs_attr_group;
err:
        return status;
}

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);

        /* disable MDM9x30 quirk */
        if (le16_to_cpu(dev->udev->descriptor.bcdUSB) >= 0x0201) {
                qmi_wwan_change_dtr(dev, false);
                qmi_wwan_manage_power(dev, 0);
        }

        /* 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;

        /* Both usbnet_suspend() and subdriver->suspend() MUST return 0
         * in system sleep context, otherwise, the resume callback has
         * to recover device from previous suspend failure.
         */
        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(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,
        .rx_fixup       = qmi_wwan_rx_fixup,
};

static const struct driver_info qmi_wwan_info_quirk_dtr = {
        .description    = "WWAN/QMI device",
        .flags          = FLAG_WWAN,
        .bind           = qmi_wwan_bind,
        .unbind         = qmi_wwan_unbind,
        .manage_power   = qmi_wwan_manage_power,
        .rx_fixup       = qmi_wwan_rx_fixup,
        .data           = QMI_WWAN_QUIRK_DTR,
};

#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_info

/* devices requiring "set DTR" quirk */
#define QMI_QUIRK_SET_DTR(vend, prod, num) \
        USB_DEVICE_INTERFACE_NUMBER(vend, prod, num), \
        .driver_info = (unsigned long)&qmi_wwan_info_quirk_dtr

/* 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,
        },
        {       /* HUAWEI_INTERFACE_NDIS_CONTROL_QUALCOMM */
                USB_VENDOR_AND_INTERFACE_INFO(HUAWEI_VENDOR_ID, USB_CLASS_VENDOR_SPEC, 0x01, 0x69),
                .driver_info        = (unsigned long)&qmi_wwan_info,
        },
        {       /* Motorola Mapphone devices with MDM6600 */
                USB_VENDOR_AND_INTERFACE_INFO(0x22b8, USB_CLASS_VENDOR_SPEC, 0xfb, 0xff),
                .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_info,
        },
        {       /* HUAWEI_NDIS_SINGLE_INTERFACE_VDF */
                USB_VENDOR_AND_INTERFACE_INFO(HUAWEI_VENDOR_ID, USB_CLASS_VENDOR_SPEC, 0x01, 0x37),
                .driver_info        = (unsigned long)&qmi_wwan_info,
        },
        {       /* HUAWEI_INTERFACE_NDIS_HW_QUALCOMM */
                USB_VENDOR_AND_INTERFACE_INFO(HUAWEI_VENDOR_ID, USB_CLASS_VENDOR_SPEC, 0x01, 0x67),
                .driver_info        = (unsigned long)&qmi_wwan_info,
        },
        {       /* Pantech UML290, P4200 and more */
                USB_VENDOR_AND_INTERFACE_INFO(0x106c, USB_CLASS_VENDOR_SPEC, 0xf0, 0xff),
                .driver_info        = (unsigned long)&qmi_wwan_info,
        },
        {       /* Pantech UML290 - newer firmware */
                USB_VENDOR_AND_INTERFACE_INFO(0x106c, USB_CLASS_VENDOR_SPEC, 0xf1, 0xff),
                .driver_info        = (unsigned long)&qmi_wwan_info,
        },
        {       /* Novatel USB551L and MC551 */
                USB_DEVICE_AND_INTERFACE_INFO(0x1410, 0xb001,
                                              USB_CLASS_COMM,
                                              USB_CDC_SUBCLASS_ETHERNET,
                                              USB_CDC_PROTO_NONE),
                .driver_info        = (unsigned long)&qmi_wwan_info,
        },
        {       /* Novatel E362 */
                USB_DEVICE_AND_INTERFACE_INFO(0x1410, 0x9010,
                                              USB_CLASS_COMM,
                                              USB_CDC_SUBCLASS_ETHERNET,
                                              USB_CDC_PROTO_NONE),
                .driver_info        = (unsigned long)&qmi_wwan_info,
        },
        {       /* Novatel Expedite E371 */
                USB_DEVICE_AND_INTERFACE_INFO(0x1410, 0x9011,
                                              USB_CLASS_COMM,
                                              USB_CDC_SUBCLASS_ETHERNET,
                                              USB_CDC_PROTO_NONE),
                .driver_info        = (unsigned long)&qmi_wwan_info,
        },
        {       /* Dell Wireless 5800 (Novatel E362) */
                USB_DEVICE_AND_INTERFACE_INFO(0x413C, 0x8195,
                                              USB_CLASS_COMM,
                                              USB_CDC_SUBCLASS_ETHERNET,
                                              USB_CDC_PROTO_NONE),
                .driver_info        = (unsigned long)&qmi_wwan_info,
        },
        {       /* Dell Wireless 5800 V2 (Novatel E362) */
                USB_DEVICE_AND_INTERFACE_INFO(0x413C, 0x8196,
                                              USB_CLASS_COMM,
                                              USB_CDC_SUBCLASS_ETHERNET,
                                              USB_CDC_PROTO_NONE),
                .driver_info        = (unsigned long)&qmi_wwan_info,
        },
        {       /* Dell Wireless 5804 (Novatel E371) */
                USB_DEVICE_AND_INTERFACE_INFO(0x413C, 0x819b,
                                              USB_CLASS_COMM,
                                              USB_CDC_SUBCLASS_ETHERNET,
                                              USB_CDC_PROTO_NONE),
                .driver_info        = (unsigned long)&qmi_wwan_info,
        },
        {       /* ADU960S */
                USB_DEVICE_AND_INTERFACE_INFO(0x16d5, 0x650a,
                                              USB_CLASS_COMM,
                                              USB_CDC_SUBCLASS_ETHERNET,
                                              USB_CDC_PROTO_NONE),
                .driver_info        = (unsigned long)&qmi_wwan_info,
        },
        {       /* HP lt2523 (Novatel E371) */
                USB_DEVICE_AND_INTERFACE_INFO(0x03f0, 0x421d,
                                              USB_CLASS_COMM,
                                              USB_CDC_SUBCLASS_ETHERNET,
                                              USB_CDC_PROTO_NONE),
                .driver_info        = (unsigned long)&qmi_wwan_info,
        },
        {       /* HP lt4112 LTE/HSPA+ Gobi 4G Module (Huawei me906e) */
                USB_DEVICE_AND_INTERFACE_INFO(0x03f0, 0x581d, USB_CLASS_VENDOR_SPEC, 1, 7),
                .driver_info = (unsigned long)&qmi_wwan_info,
        },

        /* 3. Combined interface devices matching on interface number */
        {QMI_FIXED_INTF(0x0408, 0xea42, 4)},    /* Yota / Megafon M100-1 */
        {QMI_FIXED_INTF(0x05c6, 0x6001, 3)},    /* 4G LTE usb-modem U901 */
        {QMI_FIXED_INTF(0x05c6, 0x7000, 0)},
        {QMI_FIXED_INTF(0x05c6, 0x7001, 1)},
        {QMI_FIXED_INTF(0x05c6, 0x7002, 1)},
        {QMI_FIXED_INTF(0x05c6, 0x7101, 1)},
        {QMI_FIXED_INTF(0x05c6, 0x7101, 2)},
        {QMI_FIXED_INTF(0x05c6, 0x7101, 3)},
        {QMI_FIXED_INTF(0x05c6, 0x7102, 1)},
        {QMI_FIXED_INTF(0x05c6, 0x7102, 2)},
        {QMI_FIXED_INTF(0x05c6, 0x7102, 3)},
        {QMI_FIXED_INTF(0x05c6, 0x8000, 7)},
        {QMI_FIXED_INTF(0x05c6, 0x8001, 6)},
        {QMI_FIXED_INTF(0x05c6, 0x9000, 4)},
        {QMI_FIXED_INTF(0x05c6, 0x9003, 4)},
        {QMI_FIXED_INTF(0x05c6, 0x9005, 2)},
        {QMI_FIXED_INTF(0x05c6, 0x900a, 4)},
        {QMI_FIXED_INTF(0x05c6, 0x900b, 2)},
        {QMI_FIXED_INTF(0x05c6, 0x900c, 4)},
        {QMI_FIXED_INTF(0x05c6, 0x900c, 5)},
        {QMI_FIXED_INTF(0x05c6, 0x900c, 6)},
        {QMI_FIXED_INTF(0x05c6, 0x900d, 5)},
        {QMI_FIXED_INTF(0x05c6, 0x900f, 3)},
        {QMI_FIXED_INTF(0x05c6, 0x900f, 4)},
        {QMI_FIXED_INTF(0x05c6, 0x900f, 5)},
        {QMI_FIXED_INTF(0x05c6, 0x9010, 4)},
        {QMI_FIXED_INTF(0x05c6, 0x9010, 5)},
        {QMI_FIXED_INTF(0x05c6, 0x9011, 3)},
        {QMI_FIXED_INTF(0x05c6, 0x9011, 4)},

        {QMI_FIXED_INTF(0x05c6, 0x9021, 1)},
        {QMI_FIXED_INTF(0x05c6, 0x9022, 2)},
        {QMI_FIXED_INTF(0x05c6, 0x9025, 4)},    /* Alcatel-sbell ASB TL131 TDD LTE  (China Mobile) */
        {QMI_FIXED_INTF(0x05c6, 0x9026, 3)},
        {QMI_FIXED_INTF(0x05c6, 0x902e, 5)},
        {QMI_FIXED_INTF(0x05c6, 0x9031, 5)},
        {QMI_FIXED_INTF(0x05c6, 0x9032, 4)},
        {QMI_FIXED_INTF(0x05c6, 0x9033, 3)},
        {QMI_FIXED_INTF(0x05c6, 0x9033, 4)},
        {QMI_FIXED_INTF(0x05c6, 0x9033, 5)},
        {QMI_FIXED_INTF(0x05c6, 0x9033, 6)},
        {QMI_FIXED_INTF(0x05c6, 0x9034, 3)},
        {QMI_FIXED_INTF(0x05c6, 0x9034, 4)},
        {QMI_FIXED_INTF(0x05c6, 0x9034, 5)},
        {QMI_FIXED_INTF(0x05c6, 0x9034, 6)},
        {QMI_FIXED_INTF(0x05c6, 0x9034, 7)},
        {QMI_FIXED_INTF(0x05c6, 0x9035, 4)},
        {QMI_FIXED_INTF(0x05c6, 0x9036, 3)},
        {QMI_FIXED_INTF(0x05c6, 0x9037, 5)},
        {QMI_FIXED_INTF(0x05c6, 0x9038, 4)},
        {QMI_FIXED_INTF(0x05c6, 0x903b, 7)},
        {QMI_FIXED_INTF(0x05c6, 0x903c, 6)},
        {QMI_FIXED_INTF(0x05c6, 0x903d, 6)},
        {QMI_FIXED_INTF(0x05c6, 0x903e, 5)},
        {QMI_FIXED_INTF(0x05c6, 0x9043, 3)},
        {QMI_FIXED_INTF(0x05c6, 0x9046, 3)},
        {QMI_FIXED_INTF(0x05c6, 0x9046, 4)},
        {QMI_FIXED_INTF(0x05c6, 0x9046, 5)},
        {QMI_FIXED_INTF(0x05c6, 0x9047, 2)},
        {QMI_FIXED_INTF(0x05c6, 0x9047, 3)},
        {QMI_FIXED_INTF(0x05c6, 0x9047, 4)},
        {QMI_FIXED_INTF(0x05c6, 0x9048, 4)},
        {QMI_FIXED_INTF(0x05c6, 0x9048, 5)},
        {QMI_FIXED_INTF(0x05c6, 0x9048, 6)},
        {QMI_FIXED_INTF(0x05c6, 0x9048, 7)},
        {QMI_FIXED_INTF(0x05c6, 0x9048, 8)},
        {QMI_FIXED_INTF(0x05c6, 0x904c, 5)},
        {QMI_FIXED_INTF(0x05c6, 0x904c, 6)},
        {QMI_FIXED_INTF(0x05c6, 0x904c, 7)},
        {QMI_FIXED_INTF(0x05c6, 0x904c, 8)},
        {QMI_FIXED_INTF(0x05c6, 0x9050, 3)},
        {QMI_FIXED_INTF(0x05c6, 0x9052, 4)},
        {QMI_FIXED_INTF(0x05c6, 0x9053, 6)},
        {QMI_FIXED_INTF(0x05c6, 0x9053, 7)},
        {QMI_FIXED_INTF(0x05c6, 0x9054, 5)},
        {QMI_FIXED_INTF(0x05c6, 0x9054, 6)},
        {QMI_FIXED_INTF(0x05c6, 0x9055, 3)},
        {QMI_FIXED_INTF(0x05c6, 0x9055, 4)},
        {QMI_FIXED_INTF(0x05c6, 0x9055, 5)},
        {QMI_FIXED_INTF(0x05c6, 0x9055, 6)},
        {QMI_FIXED_INTF(0x05c6, 0x9055, 7)},
        {QMI_FIXED_INTF(0x05c6, 0x9056, 3)},
        {QMI_FIXED_INTF(0x05c6, 0x9062, 2)},
        {QMI_FIXED_INTF(0x05c6, 0x9062, 3)},
        {QMI_FIXED_INTF(0x05c6, 0x9062, 4)},
        {QMI_FIXED_INTF(0x05c6, 0x9062, 5)},
        {QMI_FIXED_INTF(0x05c6, 0x9062, 6)},
        {QMI_FIXED_INTF(0x05c6, 0x9062, 7)},
        {QMI_FIXED_INTF(0x05c6, 0x9062, 8)},
        {QMI_FIXED_INTF(0x05c6, 0x9062, 9)},
        {QMI_FIXED_INTF(0x05c6, 0x9064, 3)},
        {QMI_FIXED_INTF(0x05c6, 0x9065, 6)},
        {QMI_FIXED_INTF(0x05c6, 0x9065, 7)},
        {QMI_FIXED_INTF(0x05c6, 0x9066, 5)},
        {QMI_FIXED_INTF(0x05c6, 0x9066, 6)},
        {QMI_FIXED_INTF(0x05c6, 0x9067, 1)},
        {QMI_FIXED_INTF(0x05c6, 0x9068, 2)},
        {QMI_FIXED_INTF(0x05c6, 0x9068, 3)},
        {QMI_FIXED_INTF(0x05c6, 0x9068, 4)},
        {QMI_FIXED_INTF(0x05c6, 0x9068, 5)},
        {QMI_FIXED_INTF(0x05c6, 0x9068, 6)},
        {QMI_FIXED_INTF(0x05c6, 0x9068, 7)},
        {QMI_FIXED_INTF(0x05c6, 0x9069, 5)},
        {QMI_FIXED_INTF(0x05c6, 0x9069, 6)},
        {QMI_FIXED_INTF(0x05c6, 0x9069, 7)},
        {QMI_FIXED_INTF(0x05c6, 0x9069, 8)},
        {QMI_FIXED_INTF(0x05c6, 0x9070, 4)},
        {QMI_FIXED_INTF(0x05c6, 0x9070, 5)},
        {QMI_FIXED_INTF(0x05c6, 0x9075, 5)},
        {QMI_FIXED_INTF(0x05c6, 0x9076, 4)},
        {QMI_FIXED_INTF(0x05c6, 0x9076, 5)},
        {QMI_FIXED_INTF(0x05c6, 0x9076, 6)},
        {QMI_FIXED_INTF(0x05c6, 0x9076, 7)},
        {QMI_FIXED_INTF(0x05c6, 0x9076, 8)},
        {QMI_FIXED_INTF(0x05c6, 0x9077, 3)},
        {QMI_FIXED_INTF(0x05c6, 0x9077, 4)},
        {QMI_FIXED_INTF(0x05c6, 0x9077, 5)},
        {QMI_FIXED_INTF(0x05c6, 0x9077, 6)},
        {QMI_FIXED_INTF(0x05c6, 0x9078, 3)},
        {QMI_FIXED_INTF(0x05c6, 0x9079, 4)},
        {QMI_FIXED_INTF(0x05c6, 0x9079, 5)},
        {QMI_FIXED_INTF(0x05c6, 0x9079, 6)},
        {QMI_FIXED_INTF(0x05c6, 0x9079, 7)},
        {QMI_FIXED_INTF(0x05c6, 0x9079, 8)},
        {QMI_FIXED_INTF(0x05c6, 0x9080, 5)},
        {QMI_FIXED_INTF(0x05c6, 0x9080, 6)},
        {QMI_FIXED_INTF(0x05c6, 0x9080, 7)},
        {QMI_FIXED_INTF(0x05c6, 0x9080, 8)},
        {QMI_FIXED_INTF(0x05c6, 0x9083, 3)},
        {QMI_FIXED_INTF(0x05c6, 0x9084, 4)},
        {QMI_FIXED_INTF(0x05c6, 0x920d, 0)},
        {QMI_FIXED_INTF(0x05c6, 0x920d, 5)},
        {QMI_QUIRK_SET_DTR(0x05c6, 0x9625, 4)}, /* YUGA CLM920-NC5 */
        {QMI_FIXED_INTF(0x0846, 0x68a2, 8)},
        {QMI_FIXED_INTF(0x12d1, 0x140c, 1)},    /* Huawei E173 */
        {QMI_FIXED_INTF(0x12d1, 0x14ac, 1)},    /* Huawei E1820 */
        {QMI_FIXED_INTF(0x16d8, 0x6003, 0)},    /* CMOTech 6003 */
        {QMI_FIXED_INTF(0x16d8, 0x6007, 0)},    /* CMOTech CHE-628S */
        {QMI_FIXED_INTF(0x16d8, 0x6008, 0)},    /* CMOTech CMU-301 */
        {QMI_FIXED_INTF(0x16d8, 0x6280, 0)},    /* CMOTech CHU-628 */
        {QMI_FIXED_INTF(0x16d8, 0x7001, 0)},    /* CMOTech CHU-720S */
        {QMI_FIXED_INTF(0x16d8, 0x7002, 0)},    /* CMOTech 7002 */
        {QMI_FIXED_INTF(0x16d8, 0x7003, 4)},    /* CMOTech CHU-629K */
        {QMI_FIXED_INTF(0x16d8, 0x7004, 3)},    /* CMOTech 7004 */
        {QMI_FIXED_INTF(0x16d8, 0x7006, 5)},    /* CMOTech CGU-629 */
        {QMI_FIXED_INTF(0x16d8, 0x700a, 4)},    /* CMOTech CHU-629S */
        {QMI_FIXED_INTF(0x16d8, 0x7211, 0)},    /* CMOTech CHU-720I */
        {QMI_FIXED_INTF(0x16d8, 0x7212, 0)},    /* CMOTech 7212 */
        {QMI_FIXED_INTF(0x16d8, 0x7213, 0)},    /* CMOTech 7213 */
        {QMI_FIXED_INTF(0x16d8, 0x7251, 1)},    /* CMOTech 7251 */
        {QMI_FIXED_INTF(0x16d8, 0x7252, 1)},    /* CMOTech 7252 */
        {QMI_FIXED_INTF(0x16d8, 0x7253, 1)},    /* CMOTech 7253 */
        {QMI_FIXED_INTF(0x19d2, 0x0002, 1)},
        {QMI_FIXED_INTF(0x19d2, 0x0012, 1)},
        {QMI_FIXED_INTF(0x19d2, 0x0017, 3)},
        {QMI_FIXED_INTF(0x19d2, 0x0019, 3)},    /* ONDA MT689DC */
        {QMI_FIXED_INTF(0x19d2, 0x0021, 4)},
        {QMI_FIXED_INTF(0x19d2, 0x0025, 1)},
        {QMI_FIXED_INTF(0x19d2, 0x0031, 4)},
        {QMI_FIXED_INTF(0x19d2, 0x0042, 4)},
        {QMI_FIXED_INTF(0x19d2, 0x0049, 5)},
        {QMI_FIXED_INTF(0x19d2, 0x0052, 4)},
        {QMI_FIXED_INTF(0x19d2, 0x0055, 1)},    /* ZTE (Vodafone) K3520-Z */
        {QMI_FIXED_INTF(0x19d2, 0x0058, 4)},
        {QMI_FIXED_INTF(0x19d2, 0x0063, 4)},    /* ZTE (Vodafone) K3565-Z */
        {QMI_FIXED_INTF(0x19d2, 0x0104, 4)},    /* ZTE (Vodafone) K4505-Z */
        {QMI_FIXED_INTF(0x19d2, 0x0113, 5)},
        {QMI_FIXED_INTF(0x19d2, 0x0118, 5)},
        {QMI_FIXED_INTF(0x19d2, 0x0121, 5)},
        {QMI_FIXED_INTF(0x19d2, 0x0123, 4)},
        {QMI_FIXED_INTF(0x19d2, 0x0124, 5)},
        {QMI_FIXED_INTF(0x19d2, 0x0125, 6)},
        {QMI_FIXED_INTF(0x19d2, 0x0126, 5)},
        {QMI_FIXED_INTF(0x19d2, 0x0130, 1)},
        {QMI_FIXED_INTF(0x19d2, 0x0133, 3)},
        {QMI_FIXED_INTF(0x19d2, 0x0141, 5)},
        {QMI_FIXED_INTF(0x19d2, 0x0157, 5)},    /* ZTE MF683 */
        {QMI_FIXED_INTF(0x19d2, 0x0158, 3)},
        {QMI_FIXED_INTF(0x19d2, 0x0167, 4)},    /* ZTE MF820D */
        {QMI_FIXED_INTF(0x19d2, 0x0168, 4)},
        {QMI_FIXED_INTF(0x19d2, 0x0176, 3)},
        {QMI_FIXED_INTF(0x19d2, 0x0178, 3)},
        {QMI_FIXED_INTF(0x19d2, 0x0191, 4)},    /* ZTE EuFi890 */
        {QMI_FIXED_INTF(0x19d2, 0x0199, 1)},    /* ZTE MF820S */
        {QMI_FIXED_INTF(0x19d2, 0x0200, 1)},
        {QMI_FIXED_INTF(0x19d2, 0x0257, 3)},    /* ZTE MF821 */
        {QMI_FIXED_INTF(0x19d2, 0x0265, 4)},    /* ONDA MT8205 4G LTE */
        {QMI_FIXED_INTF(0x19d2, 0x0284, 4)},    /* ZTE MF880 */
        {QMI_FIXED_INTF(0x19d2, 0x0326, 4)},    /* ZTE MF821D */
        {QMI_FIXED_INTF(0x19d2, 0x0412, 4)},    /* Telewell TW-LTE 4G */
        {QMI_FIXED_INTF(0x19d2, 0x1008, 4)},    /* ZTE (Vodafone) K3570-Z */
        {QMI_FIXED_INTF(0x19d2, 0x1010, 4)},    /* ZTE (Vodafone) K3571-Z */
        {QMI_FIXED_INTF(0x19d2, 0x1012, 4)},
        {QMI_FIXED_INTF(0x19d2, 0x1018, 3)},    /* ZTE (Vodafone) K5006-Z */
        {QMI_FIXED_INTF(0x19d2, 0x1021, 2)},
        {QMI_FIXED_INTF(0x19d2, 0x1245, 4)},
        {QMI_FIXED_INTF(0x19d2, 0x1247, 4)},
        {QMI_FIXED_INTF(0x19d2, 0x1252, 4)},
        {QMI_FIXED_INTF(0x19d2, 0x1254, 4)},
        {QMI_FIXED_INTF(0x19d2, 0x1255, 3)},
        {QMI_FIXED_INTF(0x19d2, 0x1255, 4)},
        {QMI_FIXED_INTF(0x19d2, 0x1256, 4)},
        {QMI_FIXED_INTF(0x19d2, 0x1270, 5)},    /* ZTE MF667 */
        {QMI_FIXED_INTF(0x19d2, 0x1401, 2)},
        {QMI_FIXED_INTF(0x19d2, 0x1402, 2)},    /* ZTE MF60 */
        {QMI_FIXED_INTF(0x19d2, 0x1424, 2)},
        {QMI_FIXED_INTF(0x19d2, 0x1425, 2)},
        {QMI_FIXED_INTF(0x19d2, 0x1426, 2)},    /* ZTE MF91 */
        {QMI_FIXED_INTF(0x19d2, 0x1428, 2)},    /* Telewell TW-LTE 4G v2 */
        {QMI_FIXED_INTF(0x19d2, 0x2002, 4)},    /* ZTE (Vodafone) K3765-Z */
        {QMI_FIXED_INTF(0x2001, 0x7e19, 4)},    /* D-Link DWM-221 B1 */
        {QMI_FIXED_INTF(0x2001, 0x7e35, 4)},    /* D-Link DWM-222 */
        {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, 0x68c0, 8)},    /* Sierra Wireless MC7304/MC7354 */
        {QMI_FIXED_INTF(0x1199, 0x68c0, 10)},   /* Sierra Wireless MC7304/MC7354 */
        {QMI_FIXED_INTF(0x1199, 0x901c, 8)},    /* Sierra Wireless EM7700 */
        {QMI_FIXED_INTF(0x1199, 0x901f, 8)},    /* Sierra Wireless EM7355 */
        {QMI_FIXED_INTF(0x1199, 0x9041, 8)},    /* Sierra Wireless MC7305/MC7355 */
        {QMI_FIXED_INTF(0x1199, 0x9041, 10)},   /* Sierra Wireless MC7305/MC7355 */
        {QMI_FIXED_INTF(0x1199, 0x9051, 8)},    /* Netgear AirCard 340U */
        {QMI_FIXED_INTF(0x1199, 0x9053, 8)},    /* Sierra Wireless Modem */
        {QMI_FIXED_INTF(0x1199, 0x9054, 8)},    /* Sierra Wireless Modem */
        {QMI_FIXED_INTF(0x1199, 0x9055, 8)},    /* Netgear AirCard 341U */
        {QMI_FIXED_INTF(0x1199, 0x9056, 8)},    /* Sierra Wireless Modem */
        {QMI_FIXED_INTF(0x1199, 0x9057, 8)},
        {QMI_FIXED_INTF(0x1199, 0x9061, 8)},    /* Sierra Wireless Modem */
        {QMI_FIXED_INTF(0x1199, 0x9063, 8)},    /* Sierra Wireless EM7305 */
        {QMI_FIXED_INTF(0x1199, 0x9063, 10)},   /* Sierra Wireless EM7305 */
        {QMI_FIXED_INTF(0x1199, 0x9071, 8)},    /* Sierra Wireless MC74xx */
        {QMI_FIXED_INTF(0x1199, 0x9071, 10)},   /* Sierra Wireless MC74xx */
        {QMI_FIXED_INTF(0x1199, 0x9079, 8)},    /* Sierra Wireless EM74xx */
        {QMI_FIXED_INTF(0x1199, 0x9079, 10)},   /* Sierra Wireless EM74xx */
        {QMI_FIXED_INTF(0x1199, 0x907b, 8)},    /* Sierra Wireless EM74xx */
        {QMI_FIXED_INTF(0x1199, 0x907b, 10)},   /* Sierra Wireless EM74xx */
        {QMI_FIXED_INTF(0x1199, 0x9091, 8)},    /* Sierra Wireless EM7565 */
        {QMI_FIXED_INTF(0x1bbb, 0x011e, 4)},    /* Telekom Speedstick LTE II (Alcatel One Touch L100V LTE) */
        {QMI_FIXED_INTF(0x1bbb, 0x0203, 2)},    /* Alcatel L800MA */
        {QMI_FIXED_INTF(0x2357, 0x0201, 4)},    /* TP-LINK HSUPA Modem MA180 */
        {QMI_FIXED_INTF(0x2357, 0x9000, 4)},    /* TP-LINK MA260 */
        {QMI_QUIRK_SET_DTR(0x1bc7, 0x1040, 2)}, /* Telit LE922A */
        {QMI_FIXED_INTF(0x1bc7, 0x1100, 3)},    /* Telit ME910 */
        {QMI_FIXED_INTF(0x1bc7, 0x1101, 3)},    /* Telit ME910 dual modem */
        {QMI_FIXED_INTF(0x1bc7, 0x1200, 5)},    /* Telit LE920 */
        {QMI_QUIRK_SET_DTR(0x1bc7, 0x1201, 2)}, /* Telit LE920, LE920A4 */
        {QMI_FIXED_INTF(0x1c9e, 0x9801, 3)},    /* Telewell TW-3G HSPA+ */
        {QMI_FIXED_INTF(0x1c9e, 0x9803, 4)},    /* Telewell TW-3G HSPA+ */
        {QMI_FIXED_INTF(0x1c9e, 0x9b01, 3)},    /* XS Stick W100-2 from 4G Systems */
        {QMI_FIXED_INTF(0x0b3c, 0xc000, 4)},    /* Olivetti Olicard 100 */
        {QMI_FIXED_INTF(0x0b3c, 0xc001, 4)},    /* Olivetti Olicard 120 */
        {QMI_FIXED_INTF(0x0b3c, 0xc002, 4)},    /* Olivetti Olicard 140 */
        {QMI_FIXED_INTF(0x0b3c, 0xc004, 6)},    /* Olivetti Olicard 155 */
        {QMI_FIXED_INTF(0x0b3c, 0xc005, 6)},    /* Olivetti Olicard 200 */
        {QMI_FIXED_INTF(0x0b3c, 0xc00a, 6)},    /* Olivetti Olicard 160 */
        {QMI_FIXED_INTF(0x0b3c, 0xc00b, 4)},    /* Olivetti Olicard 500 */
        {QMI_FIXED_INTF(0x1e2d, 0x0060, 4)},    /* Cinterion PLxx */
        {QMI_FIXED_INTF(0x1e2d, 0x0053, 4)},    /* Cinterion PHxx,PXxx */
        {QMI_FIXED_INTF(0x1e2d, 0x0082, 4)},    /* Cinterion PHxx,PXxx (2 RmNet) */
        {QMI_FIXED_INTF(0x1e2d, 0x0082, 5)},    /* Cinterion PHxx,PXxx (2 RmNet) */
        {QMI_FIXED_INTF(0x1e2d, 0x0083, 4)},    /* Cinterion PHxx,PXxx (1 RmNet + USB Audio)*/
        {QMI_FIXED_INTF(0x413c, 0x81a2, 8)},    /* Dell Wireless 5806 Gobi(TM) 4G LTE Mobile Broadband Card */
        {QMI_FIXED_INTF(0x413c, 0x81a3, 8)},    /* Dell Wireless 5570 HSPA+ (42Mbps) Mobile Broadband Card */
        {QMI_FIXED_INTF(0x413c, 0x81a4, 8)},    /* Dell Wireless 5570e HSPA+ (42Mbps) Mobile Broadband Card */
        {QMI_FIXED_INTF(0x413c, 0x81a8, 8)},    /* Dell Wireless 5808 Gobi(TM) 4G LTE Mobile Broadband Card */
        {QMI_FIXED_INTF(0x413c, 0x81a9, 8)},    /* Dell Wireless 5808e Gobi(TM) 4G LTE Mobile Broadband Card */
        {QMI_FIXED_INTF(0x413c, 0x81b1, 8)},    /* Dell Wireless 5809e Gobi(TM) 4G LTE Mobile Broadband Card */
        {QMI_FIXED_INTF(0x413c, 0x81b3, 8)},    /* Dell Wireless 5809e Gobi(TM) 4G LTE Mobile Broadband Card (rev3) */
        {QMI_FIXED_INTF(0x413c, 0x81b6, 8)},    /* Dell Wireless 5811e */
        {QMI_FIXED_INTF(0x413c, 0x81b6, 10)},   /* Dell Wireless 5811e */
        {QMI_FIXED_INTF(0x03f0, 0x4e1d, 8)},    /* HP lt4111 LTE/EV-DO/HSPA+ Gobi 4G Module */
        {QMI_FIXED_INTF(0x22de, 0x9061, 3)},    /* WeTelecom WPD-600N */
        {QMI_FIXED_INTF(0x1e0e, 0x9001, 5)},    /* SIMCom 7230E */
        {QMI_QUIRK_SET_DTR(0x2c7c, 0x0125, 4)}, /* Quectel EC25, EC20 R2.0  Mini PCIe */
        {QMI_QUIRK_SET_DTR(0x2c7c, 0x0121, 4)}, /* Quectel EC21 Mini PCIe */
        {QMI_FIXED_INTF(0x2c7c, 0x0296, 4)},    /* Quectel BG96 */

        /* 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/Verizon USB-1000 */
        {QMI_GOBI1K_DEVICE(0x1410, 0xa002)},    /* Novatel Gobi Modem device */
        {QMI_GOBI1K_DEVICE(0x1410, 0xa003)},    /* Novatel Gobi Modem device */
        {QMI_GOBI1K_DEVICE(0x1410, 0xa004)},    /* Novatel Gobi Modem device */
        {QMI_GOBI1K_DEVICE(0x1410, 0xa005)},    /* Novatel Gobi Modem device */
        {QMI_GOBI1K_DEVICE(0x1410, 0xa006)},    /* Novatel Gobi Modem device */
        {QMI_GOBI1K_DEVICE(0x1410, 0xa007)},    /* 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, 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_FIXED_INTF(0x05c6, 0x9215, 4)},    /* Quectel EC20 Mini PCIe */
        {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(0x0af0, 0x8120)},      /* Option GTM681W */
        {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_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 bool quectel_ec20_detected(struct usb_interface *intf)
{
        struct usb_device *dev = interface_to_usbdev(intf);

        if (dev->actconfig &&
            le16_to_cpu(dev->descriptor.idVendor) == 0x05c6 &&
            le16_to_cpu(dev->descriptor.idProduct) == 0x9215 &&
            dev->actconfig->desc.bNumInterfaces == 5)
                return true;

        return false;
}

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;
        struct usb_interface_descriptor *desc = &intf->cur_altsetting->desc;

        /* 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_info;
        }

        /* Quectel EC20 quirk where we've QMI on interface 4 instead of 0 */
        if (quectel_ec20_detected(intf) && desc->bInterfaceNumber == 0) {
                dev_dbg(&intf->dev, "Quectel EC20 quirk, skipping interface 0\n");
                return -ENODEV;
        }

        return usbnet_probe(intf, id);
}

static void qmi_wwan_disconnect(struct usb_interface *intf)
{
        struct usbnet *dev = usb_get_intfdata(intf);
        struct qmi_wwan_state *info;
        struct list_head *iter;
        struct net_device *ldev;

        /* called twice if separate control and data intf */
        if (!dev)
                return;
        info = (void *)&dev->data;
        if (info->flags & QMI_WWAN_FLAG_MUX) {
                if (!rtnl_trylock()) {
                        restart_syscall();
                        return;
                }
                rcu_read_lock();
                netdev_for_each_upper_dev_rcu(dev->net, ldev, iter)
                        qmimux_unregister_device(ldev);
                rcu_read_unlock();
                rtnl_unlock();
                info->flags &= ~QMI_WWAN_FLAG_MUX;
        }
        usbnet_disconnect(intf);
}

static struct usb_driver qmi_wwan_driver = {
        .name                 = "qmi_wwan",
        .id_table             = products,
        .probe                = qmi_wwan_probe,
        .disconnect           = qmi_wwan_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");