/*
* 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