20240107移远的4G模块EC20在Firefly的AIO-3399J开发板的Android11下调通能上网

20240107移远的4G模块EC20在Firefly的AIO-3399J开发板的Android11下调通能上网
2024/1/7 11:17

开发板：Firefly的AIO-3399J【RK3399】
SDK：rk3399-android-11-r20211216.tar.xz【Android11】
Android11.0.tar.bz2.aa【ToyBrick】
Android11.0.tar.bz2.ab
Android11.0.tar.bz2.ac

https://wiki.t-firefly.com/AIO-3399J/prepare_compile_android.html
AIO-3399J产品规格书立即购买
AIO-3399J 采用 RK3399 六核(A72x2+A53x4) 64 位处理器，主频高达1.8GHz，集成了四核 Mali-T860 GPU，性能优异。

0、简略步骤：
rootroot@rootroot-X99-Turbo:~/3TB$ cat Android11.0.tar.bz2.a* > Android11.0.tar.bz2
rootroot@rootroot-X99-Turbo:~/3TB$ tar jxvf Android11.0.tar.bz2
rootroot@rootroot-X99-Turbo:~/3TB$ mv Android11.0 64rk3399-android-11
rootroot@rootroot-X99-Turbo:~/3TB$ cd 64rk3399-android-11
rootroot@rootroot-X99-Turbo:~/3TB/64rk3399-android-11$ cd u-boot
rootroot@rootroot-X99-Turbo:~/3TB/64rk3399-android-11/u-boot$ ./make.sh rk3399
rootroot@rootroot-X99-Turbo:~/3TB/64rk3399-android-11/u-boot$ cd ..
rootroot@rootroot-X99-Turbo:~/3TB/64rk3399-android-11$ cd kernel/
rootroot@rootroot-X99-Turbo:~/3TB/64rk3399-android-11/kernel$ make ARCH=arm64 rockchip_defconfig android-11.config -j36
rootroot@rootroot-X99-Turbo:~/3TB/64rk3399-android-11/kernel$ make ARCH=arm64 BOOT_IMG=../rockdev/Image-rk3399_Android11/boot.img rk3399-sapphire-excavator-edp-avb.img -j36
rootroot@rootroot-X99-Turbo:~/3TB/64rk3399-android-11$ source build/envsetup.sh
rootroot@rootroot-X99-Turbo:~/3TB/64rk3399-android-11$ lunch
36. rk3399_Android11-userdebug
Which would you like? [aosp_arm-eng] 36
rootroot@rootroot-X99-Turbo:~/3TB/64rk3399-android-11$
rootroot@rootroot-X99-Turbo:~/3TB/64rk3399-android-11$ make -j36
rootroot@rootroot-X99-Turbo:~/3TB/64rk3399-android-11$ ./build.sh -u

Android部分：【完全一致/相同】
1、
Z:\rk3399-android-11\device\rockchip\common\4g_modem\manifest.xml
<manifest version="1.0" type="device">
<hal format="hidl">
<name>android.hardware.radio</name>
<transport>hwbinder</transport>
<fqname>@1.1::IRadio/slot1</fqname>
<fqname>@1.1::IRadio/slot2</fqname>
<fqname>@1.2::ISap/slot1</fqname>
</hal>
<hal format="hidl">
<name>android.hardware.radio.deprecated</name>
<transport>hwbinder</transport>
<version>1.0</version>
<interface>
<name>IOemHook</name>
<instance>slot1</instance>
</interface>
</hal>
<hal format="hidl">
<name>android.hardware.radio.config</name>
<transport>hwbinder</transport>
<version>1.0</version>
<interface>
<name>IRadioConfig</name>
<instance>default</instance>
</interface>
</hal>
</manifest>

2、复制库文件：【貌似没用？】
chat
dhcpcd
ip-down
ip-up
libmeig-ril.so
libquec-ril.so
libreference-ril-62.so
libreference-ril.so

Z:\rk3399-android-11\device\rockchip\common\ec20\chat
Z:\rk3399-android-11\device\rockchip\common\ec20\dhcpcd
Z:\rk3399-android-11\device\rockchip\common\ec20\ip-down
Z:\rk3399-android-11\device\rockchip\common\ec20\ip-up
Z:\rk3399-android-11\device\rockchip\common\ec20\libmeig-ril.so
Z:\rk3399-android-11\device\rockchip\common\ec20\libquec-ril.so
Z:\rk3399-android-11\device\rockchip\common\ec20\libreference-ril-62.so
Z:\rk3399-android-11\device\rockchip\common\ec20\libreference-ril.so

3、
Z:\rk3399-android-11\device\rockchip\common\BoardConfig.mk

#for rk 4g modem
BOARD_HAS_RK_4G_MODEM ?= false

修改为：
#for rk 4g modem 2024/1/5 23:36
BOARD_HAS_RK_4G_MODEM ?= false

#for ec20 modem 2024/1/5 22:25
BOARD_HAS_EC20_MODEM ?= true

ifeq ($(strip $(BOARD_HAS_EC20_MODEM)),true)
DEVICE_MANIFEST_FILE += device/rockchip/common/4g_modem/manifest.xml
endif

#for ec20 modem 2024/1/7 22:25

4、
Z:\rk3399-android-11\device\rockchip\common\device.mk
ifeq ($(strip $(TARGET_ARCH)), arm64)
PRODUCT_PROPERTY_OVERRIDES += \
vendor.rild.libpath=/vendor/lib64/librk-ril.so

PRODUCT_COPY_FILES += \
$(LOCAL_PATH)/4g_modem/bin64/dhcpcd:$(TARGET_COPY_OUT_VENDOR)/bin/dhcpcd \
$(LOCAL_PATH)/4g_modem/lib64/librk-ril.so:$(TARGET_COPY_OUT_VENDOR)/lib64/librk-ril.so
else
PRODUCT_PROPERTY_OVERRIDES += \
vendor.rild.libpath=/vendor/lib/librk-ril.so

PRODUCT_COPY_FILES += \
$(LOCAL_PATH)/4g_modem/bin32/dhcpcd:$(TARGET_COPY_OUT_VENDOR)/bin/dhcpcd \
$(LOCAL_PATH)/4g_modem/lib32/librk-ril.so:$(TARGET_COPY_OUT_VENDOR)/lib/librk-ril.so

endif
endif

#for ec20 modem 2024/1/5 22:25
ifeq ($(strip $(BOARD_HAS_EC20_MODEM)),true)
PRODUCT_COPY_FILES += \
device/rockchip/common/ec20/libquec-ril.so:vendor/lib64/libquec-ril.so \
device/rockchip/common/ec20/libmeig-ril.so:vendor/lib64/libmeig-ril.so \
device/rockchip/common/ec20/chat:system/bin/chat \
device/rockchip/common/ec20/ip-up:system/etc/ppp/ip-up \
device/rockchip/common/ec20/ip-down:system/etc/ppp/ip-down \
device/rockchip/common/ec20/dhcpcd:$(TARGET_COPY_OUT_VENDOR)/bin/dhcpcd

PRODUCT_COPY_FILES += vendor/rockchip/common/phone/etc/apns-full-conf.xml:$(TARGET_COPY_OUT_PRODUCT)/etc/apns-conf.xml

PRODUCT_PACKAGES += \
rild \
dhcpcd \
CarrierDefaultApp \
CarrierConfig

PRODUCT_PROPERTY_OVERRIDES += \
ro.boot.noril=false \
ro.telephony.default_network=9

PRODUCT_PACKAGES += \
android.hardware.radio@1.2-radio-service \
android.hardware.radio.config@1.0-service

PRODUCT_PROPERTY_OVERRIDES += \
vendor.rild.libpath=/vendor/lib64/libquec-ril.so
endif
#for ec20 modem 2024/1/7 22:25

5、
Z:\rk3399-android-11\device\rockchip\common\ueventd.rockchip.rc

# for serial
/dev/ttyS4 0660 system system

# for radio
/dev/ttyUSB* 0660 system radio
/dev/cdc-wdm0 0660 system radio

# for mali-t764
/dev/mali0 0666 system system

修改为：

# for serial
/dev/ttyS4 0660 system system

#for ec20 modem 2024/1/5 22:25
# for radio
/dev/ttyUSB* 0660 radio radio
/dev/ttyACM* 0666 radio radio
/dev/cdc-wdm* 0666 radio radio
/dev/qcqmi* 0660 radio radio
#for ec20 modem 2024/1/5 22:25

# for mali-t764
/dev/mali0 0666 system system

6、
Z:\rk3399-android-11\device\rockchip\rk3399\rk3399_Android11\overlay\frameworks\base\core\res\res\values\config.xml

<?xml version="1.0" encoding="utf-8"?>

<string-array translatable="false" name="networkAttributes">
<item>"wifi,1,1,2,-1,true"</item>
<item>"mobile,0,0,0,-1,true"</item>
<item>"mobile_mms,2,0,2,60000,true"</item>
<item>"mobile_supl,3,0,2,60000,true"</item>
<item>"mobile_dun,4,0,2,60000,true"</item>
<item>"mobile_hipri,5,0,3,60000,true"</item>
<item>"mobile_fota,10,0,2,60000,true"</item>
<item>"mobile_ims,11,0,2,60000,true"</item>
<item>"mobile_cbs,12,0,2,60000,true"</item>

<item>"bluetooth,7,7,0,-1,true"</item>
<item>"ethernet,9,9,9,-1,true"</item>

<item>"pppoe,15,15,5,-1,true"</item>
</string-array>

<bool name="config_automatic_brightness_available">true</bool>

【不用修改】
Z:\rk3399-android-11\device\rockchip\rk3399\device.mk

7、
Z:\rk3399-android-11\kernel\drivers\net\usb\Makefile
# SPDX-License-Identifier: GPL-2.0
#
# Makefile for USB Network drivers
#

obj-$(CONFIG_USB_CATC)       += catc.o
obj-$(CONFIG_USB_KAWETH)   += kaweth.o
obj-$(CONFIG_USB_PEGASUS)   += pegasus.o
obj-$(CONFIG_USB_RTL8150)   += rtl8150.o
obj-$(CONFIG_USB_RTL8152)   += r8152.o
obj-$(CONFIG_USB_HSO)       += hso.o
obj-$(CONFIG_USB_LAN78XX)   += lan78xx.o
obj-$(CONFIG_USB_NET_AX8817X)   += asix.o
asix-y := asix_devices.o asix_common.o ax88172a.o
obj-$(CONFIG_USB_NET_AX88179_178A) += ax88179_178a.o
obj-$(CONFIG_USB_NET_CDCETHER)   += cdc_ether.o
obj-$(CONFIG_USB_NET_CDC_EEM)   += cdc_eem.o
obj-$(CONFIG_USB_NET_DM9601)   += dm9601.o
obj-$(CONFIG_USB_NET_SR9700)   += sr9700.o
obj-$(CONFIG_USB_NET_SR9800)   += sr9800.o
obj-$(CONFIG_USB_NET_SMSC75XX)   += smsc75xx.o
obj-$(CONFIG_USB_NET_SMSC95XX)   += smsc95xx.o
obj-$(CONFIG_USB_NET_GL620A)   += gl620a.o
obj-$(CONFIG_USB_NET_NET1080)   += net1080.o
obj-$(CONFIG_USB_NET_PLUSB)   += plusb.o
obj-$(CONFIG_USB_NET_RNDIS_HOST)   += rndis_host.o
obj-$(CONFIG_USB_NET_CDC_SUBSET_ENABLE)   += cdc_subset.o
obj-$(CONFIG_USB_NET_ZAURUS)   += zaurus.o
obj-$(CONFIG_USB_NET_MCS7830)   += mcs7830.o
obj-$(CONFIG_USB_USBNET)   += usbnet.o
obj-$(CONFIG_USB_NET_INT51X1)   += int51x1.o
obj-$(CONFIG_USB_CDC_PHONET)   += cdc-phonet.o
obj-$(CONFIG_USB_NET_KALMIA)   += kalmia.o
obj-$(CONFIG_USB_IPHETH)   += ipheth.o
obj-$(CONFIG_USB_SIERRA_NET)   += sierra_net.o
obj-$(CONFIG_USB_NET_CX82310_ETH)   += cx82310_eth.o
obj-$(CONFIG_USB_NET_CDC_NCM)   += cdc_ncm.o
obj-$(CONFIG_USB_NET_HUAWEI_CDC_NCM)   += huawei_cdc_ncm.o
obj-$(CONFIG_USB_VL600)       += lg-vl600.o
#obj-$(CONFIG_USB_NET_QMI_WWAN)   += qmi_wwan.o
obj-$(CONFIG_USB_NET_QMI_WWAN) += qmi_wwan_q.o
obj-$(CONFIG_USB_NET_CDC_MBIM)   += cdc_mbim.o
obj-$(CONFIG_USB_NET_CH9200)   += ch9200.o

Z:\rk3399-android-11\kernel\drivers\net\usb\qmi_wwan_q.c

/*
* Copyright (c) 2012 Bjørn Mork <bjorn@mork.no>
*
* The probing code is heavily inspired by cdc_ether, which is:
* Copyright (C) 2003-2005 by David Brownell
* Copyright (C) 2006 by Ole Andre Vadla Ravnas (ActiveSync)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*/

#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/ethtool.h>
#include <linux/etherdevice.h>
#include <linux/mii.h>
#include <linux/usb.h>
#include <linux/usb/cdc.h>
#include <linux/usb/usbnet.h>
#include <linux/usb/cdc-wdm.h>

/* This driver supports wwan (3G/LTE/?) devices using a vendor
* specific management protocol called Qualcomm MSM Interface (QMI) -
* in addition to the more common AT commands over serial interface
* management
*
* QMI is wrapped in CDC, using CDC encapsulated commands on the
* control ("master") interface of a two-interface CDC Union
* resembling standard CDC ECM. The devices do not use the control
* interface for any other CDC messages. Most likely because the
* management protocol is used in place of the standard CDC
* notifications NOTIFY_NETWORK_CONNECTION and NOTIFY_SPEED_CHANGE
*
* Alternatively, control and data functions can be combined in a
* single USB interface.
*
* Handling a protocol like QMI is out of the scope for any driver.
* It is exported as a character device using the cdc-wdm driver as
* a subdriver, enabling userspace applications ("modem managers") to
* handle it.
*
* These devices may alternatively/additionally be configured using AT
* commands on a serial interface
*/

/* driver specific data */
struct qmi_wwan_state {
   struct usb_driver *subdriver;
   atomic_t pmcount;
   unsigned long unused;
   struct usb_interface *control;
   struct usb_interface *data;
};

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

#if 1 //Added by Quectel
#include <linux/etherdevice.h>
#include <net/arp.h>
#include <net/ip.h>
#include <net/ipv6.h>

/*
Quectel_WCDMA&LTE_Linux_USB_Driver_User_Guide_V1.9.pdf
5.6.   Test QMAP on GobiNet or QMI WWAN
0 - no QMAP
1 - QMAP (Aggregation protocol)
X - QMAP (Multiplexing and Aggregation protocol)
*/
#define QUECTEL_WWAN_QMAP 4

#if defined(QUECTEL_WWAN_QMAP)
#define QUECTEL_QMAP_MUX_ID 0x81

static uint __read_mostly qmap_mode = 0;
module_param( qmap_mode, uint, S_IRUGO);
module_param_named( rx_qmap, qmap_mode, uint, S_IRUGO );
#endif

#ifdef CONFIG_BRIDGE
//#define QUECTEL_BRIDGE_MODE
#endif

#ifdef QUECTEL_BRIDGE_MODE
static uint __read_mostly bridge_mode = BIT(0)/*|BIT(1)*/;
module_param( bridge_mode, uint, S_IRUGO );
#endif

#if defined(QUECTEL_WWAN_QMAP)
typedef struct sQmiWwanQmap
{
   struct usbnet *mpNetDev;
   atomic_t refcount;
   struct net_device *mpQmapNetDev[QUECTEL_WWAN_QMAP];
   uint link_state;
   uint qmap_mode;
#ifdef QUECTEL_BRIDGE_MODE
   uint bridge_mode;
   uint bridge_ipv4;
   unsigned char bridge_mac[ETH_ALEN];
#endif
} sQmiWwanQmap;

struct qmap_priv {
   struct net_device *real_dev;
   u8 offset_id;
#ifdef QUECTEL_BRIDGE_MODE
   uint bridge_mode;
   uint bridge_ipv4;
   unsigned char bridge_mac[ETH_ALEN];
#endif
};

struct qmap_hdr {
u8 cd_rsvd_pad;
u8 mux_id;
u16 pkt_len;
} __packed;

#ifdef QUECTEL_BRIDGE_MODE
static int is_qmap_netdev(const struct net_device *netdev);
#endif
#endif

#ifdef QUECTEL_BRIDGE_MODE
static int bridge_arp_reply(struct net_device *net, struct sk_buff *skb, uint bridge_ipv4) {
struct arphdr *parp;
u8 *arpptr, *sha;
u8 sip[4], tip[4], ipv4[4];
struct sk_buff *reply = NULL;

ipv4[0] = (bridge_ipv4 >> 24) & 0xFF;
ipv4[1] = (bridge_ipv4 >> 16) & 0xFF;
ipv4[2] = (bridge_ipv4 >> 8) & 0xFF;
ipv4[3] = (bridge_ipv4 >> 0) & 0xFF;

parp = arp_hdr(skb);

if (parp->ar_hrd == htons(ARPHRD_ETHER) && parp->ar_pro == htons(ETH_P_IP)
&& parp->ar_op == htons(ARPOP_REQUEST) && parp->ar_hln == 6 && parp->ar_pln == 4) {
arpptr = (u8 *)parp + sizeof(struct arphdr);
sha = arpptr;
arpptr += net->addr_len;   /* sha */
memcpy(sip, arpptr, sizeof(sip));
arpptr += sizeof(sip);
arpptr += net->addr_len;   /* tha */
memcpy(tip, arpptr, sizeof(tip));

pr_info("%s sip = %d.%d.%d.%d, tip=%d.%d.%d.%d, ipv4=%d.%d.%d.%d\n", netdev_name(net),
sip[0], sip[1], sip[2], sip[3], tip[0], tip[1], tip[2], tip[3], ipv4[0], ipv4[1], ipv4[2], ipv4[3]);
   //wwan0 sip = 10.151.137.255, tip=10.151.138.0, ipv4=10.151.137.255
if (tip[0] == ipv4[0] && tip[1] == ipv4[1] && (tip[2]&0xFC) == (ipv4[2]&0xFC) && tip[3] != ipv4[3])
reply = arp_create(ARPOP_REPLY, ETH_P_ARP, *((__be32 *)sip), net, *((__be32 *)tip), sha, default_modem_addr, sha);

if (reply) {
skb_reset_mac_header(reply);
__skb_pull(reply, skb_network_offset(reply));
reply->ip_summed = CHECKSUM_UNNECESSARY;
reply->pkt_type = PACKET_HOST;

netif_rx_ni(reply);
}
return 1;
}

return 0;
}

static struct sk_buff *bridge_mode_tx_fixup(struct net_device *net, struct sk_buff *skb, uint bridge_ipv4, unsigned char *bridge_mac) {
   struct ethhdr *ehdr;
   const struct iphdr *iph;

   skb_reset_mac_header(skb);
   ehdr = eth_hdr(skb);

   if (ehdr->h_proto == htons(ETH_P_ARP)) {
       if (bridge_ipv4)
           bridge_arp_reply(net, skb, bridge_ipv4);
       return NULL;
   }

   iph = ip_hdr(skb);
   //DBG("iphdr: ");
   //PrintHex((void *)iph, sizeof(struct iphdr));

// 1   0.000000000   0.0.0.0   255.255.255.255   DHCP   362   DHCP Request - Transaction ID 0xe7643ad7
   if (ehdr->h_proto == htons(ETH_P_IP) && iph->protocol == IPPROTO_UDP && iph->saddr == 0x00000000 && iph->daddr == 0xFFFFFFFF) {
       //if (udp_hdr(skb)->dest == htons(67)) //DHCP Request
       {
           memcpy(bridge_mac, ehdr->h_source, ETH_ALEN);
           pr_info("%s PC Mac Address: %02x:%02x:%02x:%02x:%02x:%02x\n", netdev_name(net),
               bridge_mac[0], bridge_mac[1], bridge_mac[2], bridge_mac[3], bridge_mac[4], bridge_mac[5]);
       }
   }

   if (memcmp(ehdr->h_source, bridge_mac, ETH_ALEN)) {
       return NULL;
   }

   return skb;
}
#endif

#if defined(QUECTEL_WWAN_QMAP)
static ssize_t qmap_mode_show(struct device *dev, struct device_attribute *attr, char *buf) {
   struct net_device *netdev = to_net_dev(dev);
   struct usbnet * usbnetdev = netdev_priv( netdev );
   struct qmi_wwan_state *info = (void *)&usbnetdev->data;
   sQmiWwanQmap *pQmapDev = (sQmiWwanQmap *)info->unused;

   return snprintf(buf, PAGE_SIZE, "%d\n", pQmapDev->qmap_mode);
}

static DEVICE_ATTR(qmap_mode, S_IRUGO, qmap_mode_show, NULL);

static ssize_t link_state_show(struct device *dev, struct device_attribute *attr, char *buf) {
   struct net_device *netdev = to_net_dev(dev);
   struct usbnet * usbnetdev = netdev_priv( netdev );
   struct qmi_wwan_state *info = (void *)&usbnetdev->data;
   sQmiWwanQmap *pQmapDev = (sQmiWwanQmap *)info->unused;

   return snprintf(buf, PAGE_SIZE, "0x%x\n", pQmapDev->link_state);
}

static ssize_t link_state_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) {
   struct net_device *netdev = to_net_dev(dev);
   struct usbnet * usbnetdev = netdev_priv( netdev );
   struct qmi_wwan_state *info = (void *)&usbnetdev->data;
   sQmiWwanQmap *pQmapDev = (sQmiWwanQmap *)info->unused;
   unsigned link_state = 0;
   unsigned old_link = pQmapDev->link_state;

   link_state = simple_strtoul(buf, NULL, 0);
   if (pQmapDev->qmap_mode == 1)
       pQmapDev->link_state = !!link_state;
   else if (pQmapDev->qmap_mode > 1) {
       if (0 < link_state && link_state <= pQmapDev->qmap_mode)
           pQmapDev->link_state |= (1 << (link_state - 1));
       else if (0x80 < link_state && link_state <= (0x80 + pQmapDev->qmap_mode))
           pQmapDev->link_state &= ~(1 << ((link_state&0xF) - 1));
   }

   if (old_link != pQmapDev->link_state)
       dev_info(dev, "link_state 0x%x -> 0x%x\n", old_link, pQmapDev->link_state);

   return count;
}

#ifdef QUECTEL_BRIDGE_MODE
static ssize_t bridge_mode_show(struct device *dev, struct device_attribute *attr, char *buf) {
   struct net_device *netdev = to_net_dev(dev);
   uint bridge_mode = 0;

   if (is_qmap_netdev(netdev)) {
       struct qmap_priv *priv = netdev_priv(netdev);
       bridge_mode = priv->bridge_mode;
   }
   else {
       struct usbnet * usbnetdev = netdev_priv( netdev );
       struct qmi_wwan_state *info = (void *)&usbnetdev->data;
       sQmiWwanQmap *pQmapDev = (sQmiWwanQmap *)info->unused;
       bridge_mode = pQmapDev->bridge_mode;
   }

   return snprintf(buf, PAGE_SIZE, "%u\n", bridge_mode);
}

static ssize_t bridge_ipv4_show(struct device *dev, struct device_attribute *attr, char *buf) {
   struct net_device *netdev = to_net_dev(dev);
   unsigned int bridge_ipv4 = 0;
   unsigned char ipv4[4];

   if (is_qmap_netdev(netdev)) {
       struct qmap_priv *priv = netdev_priv(netdev);
       bridge_ipv4 = priv->bridge_ipv4;
   }
   else {
       struct usbnet * usbnetdev = netdev_priv( netdev );
       struct qmi_wwan_state *info = (void *)&usbnetdev->data;
       sQmiWwanQmap *pQmapDev = (sQmiWwanQmap *)info->unused;
       bridge_ipv4 = pQmapDev->bridge_ipv4;
   }

   ipv4[0] = (bridge_ipv4 >> 24) & 0xFF;
   ipv4[1] = (bridge_ipv4 >> 16) & 0xFF;
   ipv4[2] = (bridge_ipv4 >> 8) & 0xFF;
   ipv4[3] = (bridge_ipv4 >> 0) & 0xFF;

   return snprintf(buf, PAGE_SIZE, "%d.%d.%d.%d\n", ipv4[0], ipv4[1], ipv4[2], ipv4[3]);
}

static ssize_t bridge_ipv4_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) {
   struct net_device *netdev = to_net_dev(dev);

   if (is_qmap_netdev(netdev)) {
       struct qmap_priv *priv = netdev_priv(netdev);
       priv->bridge_ipv4 = simple_strtoul(buf, NULL, 16);
   }
   else {
       struct usbnet * usbnetdev = netdev_priv( netdev );
       struct qmi_wwan_state *info = (void *)&usbnetdev->data;
       sQmiWwanQmap *pQmapDev = (sQmiWwanQmap *)info->unused;
       pQmapDev->bridge_ipv4 = simple_strtoul(buf, NULL, 16);
   }

   return count;
}
#endif

static DEVICE_ATTR(link_state, S_IWUSR | S_IRUGO, link_state_show, link_state_store);
#ifdef QUECTEL_BRIDGE_MODE
static DEVICE_ATTR(bridge_mode, S_IRUGO, bridge_mode_show, NULL);
static DEVICE_ATTR(bridge_ipv4, S_IWUSR | S_IRUGO, bridge_ipv4_show, bridge_ipv4_store);
#endif

static struct attribute *qmi_wwan_sysfs_attrs[] = {
   &dev_attr_link_state.attr,
   &dev_attr_qmap_mode.attr,
#ifdef QUECTEL_BRIDGE_MODE
   &dev_attr_bridge_mode.attr,
   &dev_attr_bridge_ipv4.attr,
#endif
   NULL,
};

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

#ifdef QUECTEL_BRIDGE_MODE
static struct attribute *qmi_qmap_sysfs_attrs[] = {
   &dev_attr_bridge_mode.attr,
   &dev_attr_bridge_ipv4.attr,
   NULL,
};

static struct attribute_group qmi_qmap_sysfs_attr_group = {
   .attrs = qmi_qmap_sysfs_attrs,
};
#endif

static int qmap_open(struct net_device *dev)
{
   struct qmap_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 qmap_stop(struct net_device *pNet)
{
   netif_carrier_off(pNet);
   return 0;
}

static int qmap_start_xmit(struct sk_buff *skb, struct net_device *pNet)
{
   int err;
   struct qmap_priv *priv = netdev_priv(pNet);
   unsigned int len;
   struct qmap_hdr *hdr;

   skb_reset_mac_header(skb);

#ifdef QUECTEL_BRIDGE_MODE
   if (priv->bridge_mode && bridge_mode_tx_fixup(pNet, skb, priv->bridge_ipv4, priv->bridge_mac) == NULL) {
   dev_kfree_skb_any (skb);
   return NETDEV_TX_OK;
   }
#endif

   if (skb_pull(skb, ETH_HLEN) == NULL) {
   dev_kfree_skb_any (skb);
   return NETDEV_TX_OK;
    }

   len = skb->len;
   hdr = (struct qmap_hdr *)skb_push(skb, sizeof(struct qmap_hdr));
   hdr->cd_rsvd_pad = 0;
   hdr->mux_id = QUECTEL_QMAP_MUX_ID + priv->offset_id;
   hdr->pkt_len = cpu_to_be16(len);

   skb->dev = priv->real_dev;
   err = dev_queue_xmit(skb);
   if (err == NET_XMIT_SUCCESS) {
       pNet->stats.tx_packets++;
       pNet->stats.tx_bytes += skb->len;
   } else {
       pNet->stats.tx_errors++;
   }

   return err;
}

static const struct net_device_ops qmap_netdev_ops = {
   .ndo_open = qmap_open,
   .ndo_stop = qmap_stop,
   .ndo_start_xmit = qmap_start_xmit,
};

static int qmap_register_device(sQmiWwanQmap * pDev, u8 offset_id)
{
struct net_device *real_dev = pDev->mpNetDev->net;
struct net_device *qmap_net;
struct qmap_priv *priv;
int err;

qmap_net = alloc_etherdev(sizeof(*priv));
if (!qmap_net)
return -ENOBUFS;

SET_NETDEV_DEV(qmap_net, &real_dev->dev);
priv = netdev_priv(qmap_net);
priv->offset_id = offset_id;
priv->real_dev = real_dev;
sprintf(qmap_net->name, "%s.%d", real_dev->name, offset_id + 1);
qmap_net->netdev_ops = &qmap_netdev_ops;
memcpy (qmap_net->dev_addr, real_dev->dev_addr, ETH_ALEN);

#ifdef QUECTEL_BRIDGE_MODE
   priv->bridge_mode = !!(pDev->bridge_mode & BIT(offset_id));
   qmap_net->sysfs_groups[0] = &qmi_qmap_sysfs_attr_group;
#endif

err = register_netdev(qmap_net);
if (err < 0)
goto out_free_newdev;
netif_device_attach (qmap_net);

pDev->mpQmapNetDev[offset_id] = qmap_net;
qmap_net->flags |= IFF_NOARP;

dev_info(&real_dev->dev, "%s %s\n", __func__, qmap_net->name);

return 0;

out_free_newdev:
free_netdev(qmap_net);
return err;
}

static void qmap_unregister_device(sQmiWwanQmap * pDev, u8 offset_id) {
struct net_device *net = pDev->mpQmapNetDev[offset_id];
if (net != NULL) {
netif_carrier_off( net );
unregister_netdev (net);
free_netdev(net);
}
}

#ifdef CONFIG_ANDROID
static int qmap_ndo_do_ioctl(struct net_device *dev,struct ifreq *ifr, int cmd) {
   int rc = -EOPNOTSUPP;
   uint link_state = 0;

   switch (cmd) {
   case 0x89F1: //SIOCDEVPRIVATE
       rc = copy_from_user(&link_state, ifr->ifr_ifru.ifru_data, sizeof(link_state));
       if (!rc) {
           char buf[32];
           snprintf(buf, sizeof(buf), "%u", link_state);
           link_state_store(&dev->dev, NULL, buf, strlen(buf));
       }
   break;

   default:
   break;
   }

   return rc;
}
#endif

#ifdef QUECTEL_BRIDGE_MODE
static int is_qmap_netdev(const struct net_device *netdev) {
   return netdev->netdev_ops == &qmap_netdev_ops;
}
#endif
#endif

static struct sk_buff *qmi_wwan_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags) {
   //MDM9x07,MDM9628,MDM9x40,SDX20,SDX24 only work on RAW IP mode
   if ((dev->driver_info->flags & FLAG_NOARP) == 0)
       return skb;

   // Skip Ethernet header from message
   if (dev->net->hard_header_len == 0)
       return skb;
   else
       skb_reset_mac_header(skb);

#ifdef QUECTEL_BRIDGE_MODE
{
   struct qmi_wwan_state *info = (void *)&dev->data;
   sQmiWwanQmap *pQmapDev = (sQmiWwanQmap *)info->unused;

   if (pQmapDev->bridge_mode && bridge_mode_tx_fixup(dev->net, skb, pQmapDev->bridge_ipv4, pQmapDev->bridge_mac) == NULL) {
   dev_kfree_skb_any (skb);
   return NULL;
   }
}
#endif

   if (skb_pull(skb, ETH_HLEN)) {
       return skb;
   } else {
       dev_err(&dev->intf->dev, "Packet Dropped ");
   }

   // Filter the packet out, release it
   dev_kfree_skb_any(skb);
   return NULL;
}
#endif

/* 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)
{
   __be16 proto;
#ifdef QUECTEL_BRIDGE_MODE
   struct qmi_wwan_state *info = (void *)&dev->data;
   sQmiWwanQmap *pQmapDev = (sQmiWwanQmap *)info->unused;
#endif

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

   switch (skb->data[0] & 0xf0) {
   case 0x40:
       proto = htons(ETH_P_IP);
       break;
   case 0x60:
       proto = htons(ETH_P_IPV6);
       break;
   case 0x00:
       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:
       /* pass along other packets without modifications */
       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;
   memset(eth_hdr(skb)->h_source, 0, ETH_ALEN);
#if 1 //Added by Quectel
   //some kernel will drop ethernet packet which's souce mac is all zero
   memcpy(eth_hdr(skb)->h_source, default_modem_addr, ETH_ALEN);
#endif
#ifdef QUECTEL_BRIDGE_MODE
   if (pQmapDev->bridge_mode) {
       memcpy(eth_hdr(skb)->h_dest, pQmapDev->bridge_mac, ETH_ALEN);
   }
#endif

fix_dest:
   memcpy(eth_hdr(skb)->h_dest, dev->net->dev_addr, ETH_ALEN);
   return 1;
}

#if defined(QUECTEL_WWAN_QMAP)
static struct sk_buff *qmap_qmi_wwan_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags) {
   struct qmi_wwan_state *info = (void *)&dev->data;
   sQmiWwanQmap *pQmapDev = (sQmiWwanQmap *)info->unused;
   struct qmap_hdr *qhdr;

   if (unlikely(pQmapDev == NULL)) {
       goto drop_skb;
   } else if (unlikely(pQmapDev->qmap_mode && !pQmapDev->link_state)) {
       dev_dbg(&dev->net->dev, "link_state 0x%x, drop skb, len = %u\n", pQmapDev->link_state, skb->len);
       goto drop_skb;
   } else if (pQmapDev->qmap_mode == 0) {
       return qmi_wwan_tx_fixup(dev, skb, flags);
   }
   else if (pQmapDev->qmap_mode > 1) {
       qhdr = (struct qmap_hdr *)skb->data;
       if (qhdr->cd_rsvd_pad != 0) {
           goto drop_skb;
       }
       if ((qhdr->mux_id&0xF0) != 0x80) {
           goto drop_skb;
       }
       return skb;
   }
   else {
       if (qmi_wwan_tx_fixup(dev, skb, flags)) {
           qhdr = (struct qmap_hdr *)skb_push(skb, sizeof(struct qmap_hdr));
           qhdr->cd_rsvd_pad = 0;
           qhdr->mux_id = QUECTEL_QMAP_MUX_ID;
           qhdr->pkt_len = cpu_to_be16(skb->len - sizeof(struct qmap_hdr));

return skb;
       }
       else {
           return NULL;
       }
   }

drop_skb:
   dev_kfree_skb_any (skb);
   return NULL;
}

static int qmap_qmi_wwan_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
{
   struct qmi_wwan_state *info = (void *)&dev->data;
   sQmiWwanQmap *pQmapDev = (sQmiWwanQmap *)info->unused;
   static int debug_len = 0;
   int debug_pkts = 0;
   int update_len = skb->len;

   if (pQmapDev->qmap_mode == 0)
       return qmi_wwan_rx_fixup(dev, skb);

   while (skb->len > sizeof(struct qmap_hdr)) {
       struct qmap_hdr *qhdr = (struct qmap_hdr *)skb->data;
       struct net_device *qmap_net;
       struct sk_buff *qmap_skb;
#ifdef QUECTEL_BRIDGE_MODE
       uint bridge_mode = 0;
       unsigned char *bridge_mac;
#endif
       __be16 proto;
       int pkt_len;
       u8 offset_id = 0;
       int err;
       unsigned len = (be16_to_cpu(qhdr->pkt_len) + sizeof(struct qmap_hdr));

       if (skb->len < (be16_to_cpu(qhdr->pkt_len) + sizeof(struct qmap_hdr))) {
           dev_info(&dev->net->dev, "drop qmap unknow pkt, len=%d, pkt_len=%d\n", skb->len, be16_to_cpu(qhdr->pkt_len));
           goto out;
       }

       debug_pkts++;

       if (qhdr->cd_rsvd_pad & 0x80) {
           dev_info(&dev->net->dev, "drop qmap command packet %x\n", qhdr->cd_rsvd_pad);
           goto skip_pkt;;
       }

       offset_id = qhdr->mux_id - QUECTEL_QMAP_MUX_ID;
       if (offset_id >= pQmapDev->qmap_mode) {
           dev_info(&dev->net->dev, "drop qmap unknow mux_id %x\n", qhdr->mux_id);
           goto skip_pkt;
       }

       qmap_net = pQmapDev->mpQmapNetDev[offset_id];

       if (qmap_net == NULL) {
           dev_info(&dev->net->dev, "drop qmap unknow mux_id %x\n", qhdr->mux_id);
           goto skip_pkt;
       }

       switch (skb->data[sizeof(struct qmap_hdr)] & 0xf0) {
           case 0x40:
               proto = htons(ETH_P_IP);
           break;
           case 0x60:
               proto = htons(ETH_P_IPV6);
           break;
           default:
               goto skip_pkt;
       }

       pkt_len = be16_to_cpu(qhdr->pkt_len) - (qhdr->cd_rsvd_pad&0x3F);
       qmap_skb = netdev_alloc_skb(qmap_net, ETH_HLEN + pkt_len);
       if (qmap_skb == NULL) {
           dev_info(&dev->net->dev, "fail to alloc skb, pkt_len = %d\n", pkt_len);
           return 0;
       }

       skb_reset_mac_header(qmap_skb);
       memcpy(eth_hdr(qmap_skb)->h_source, default_modem_addr, ETH_ALEN);
       memcpy(eth_hdr(qmap_skb)->h_dest, qmap_net->dev_addr, ETH_ALEN);
       eth_hdr(qmap_skb)->h_proto = proto;
       memcpy(skb_put(qmap_skb, ETH_HLEN + pkt_len) + ETH_HLEN, skb->data + sizeof(struct qmap_hdr), pkt_len);
#ifdef QUECTEL_BRIDGE_MODE
       if (pQmapDev->qmap_mode > 1) {
           struct qmap_priv *priv = netdev_priv(qmap_net);
           bridge_mode = priv->bridge_mode;
           bridge_mac = priv->bridge_mac;
       }
       else {
           bridge_mode = pQmapDev->bridge_mode;
           bridge_mac = pQmapDev->bridge_mac;
       }
   if (bridge_mode) {
       memcpy(eth_hdr(qmap_skb)->h_dest, bridge_mac, ETH_ALEN);
   }
#endif

       if (pQmapDev->qmap_mode > 1) {
           qmap_skb->protocol = eth_type_trans (qmap_skb, qmap_net);
           memset(qmap_skb->cb, 0, sizeof(struct skb_data));
           err = netif_rx(qmap_skb);
           if (err == NET_RX_SUCCESS) {
               qmap_net->stats.rx_packets++;
               qmap_net->stats.rx_bytes += qmap_skb->len;
           } else {
               qmap_net->stats.rx_errors++;
           }
       }
       else {
           usbnet_skb_return(dev, qmap_skb);
       }

       skip_pkt:
       skb_pull(skb, len);
   }

out:
   if (update_len > debug_len) {
       debug_len = update_len;
       dev_info(&dev->net->dev, "rx_pkts=%d, rx_len=%d\n", debug_pkts, debug_len);
   }

return 0;
}
#endif

/* 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_set_mac_address   = qmi_wwan_mac_addr,
   .ndo_validate_addr   = eth_validate_addr,
#if defined(QUECTEL_WWAN_QMAP) && defined(CONFIG_ANDROID)
   .ndo_do_ioctl = qmap_ndo_do_ioctl,
#endif
};

/* 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;
}

static int qmi_wwan_bind(struct usbnet *dev, struct usb_interface *intf)
{
   int status = -1;
   u8 *buf = intf->cur_altsetting->extra;
   int len = intf->cur_altsetting->extralen;
   struct usb_interface_descriptor *desc = &intf->cur_altsetting->desc;
   struct usb_cdc_union_desc *cdc_union = NULL;
   struct usb_cdc_ether_desc *cdc_ether = NULL;
   u32 found = 0;
   struct usb_driver *driver = driver_of(intf);
   struct qmi_wwan_state *info = (void *)&dev->data;

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

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

   /* and a number of CDC descriptors */
   while (len > 3) {
       struct usb_descriptor_header *h = (void *)buf;

       /* ignore any misplaced descriptors */
       if (h->bDescriptorType != USB_DT_CS_INTERFACE)
           goto next_desc;

       /* buf[2] is CDC descriptor subtype */
       switch (buf[2]) {
       case USB_CDC_HEADER_TYPE:
           if (found & 1 << USB_CDC_HEADER_TYPE) {
               dev_dbg(&intf->dev, "extra CDC header\n");
               goto err;
           }
           if (h->bLength != sizeof(struct usb_cdc_header_desc)) {
               dev_dbg(&intf->dev, "CDC header len %u\n",
                   h->bLength);
               goto err;
           }
           break;
       case USB_CDC_UNION_TYPE:
           if (found & 1 << USB_CDC_UNION_TYPE) {
               dev_dbg(&intf->dev, "extra CDC union\n");
               goto err;
           }
           if (h->bLength != sizeof(struct usb_cdc_union_desc)) {
               dev_dbg(&intf->dev, "CDC union len %u\n",
                   h->bLength);
               goto err;
           }
           cdc_union = (struct usb_cdc_union_desc *)buf;
           break;
       case USB_CDC_ETHERNET_TYPE:
           if (found & 1 << USB_CDC_ETHERNET_TYPE) {
               dev_dbg(&intf->dev, "extra CDC ether\n");
               goto err;
           }
           if (h->bLength != sizeof(struct usb_cdc_ether_desc)) {
               dev_dbg(&intf->dev, "CDC ether len %u\n",
                   h->bLength);
               goto err;
           }
           cdc_ether = (struct usb_cdc_ether_desc *)buf;
           break;
       }

       /* Remember which CDC functional descriptors we've seen. Works
       * for all types we care about, of which USB_CDC_ETHERNET_TYPE
       * (0x0f) is the highest numbered
       */
       if (buf[2] < 32)
           found |= 1 << buf[2];

next_desc:
       len -= h->bLength;
       buf += h->bLength;
   }

   /* 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);
           goto err;
       }
   }

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

   /* claim data interface and set it up */
   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);
   }

   /* Never use the same address on both ends of the link, even
   * if the buggy firmware told us to.
   */
   if (ether_addr_equal(dev->net->dev_addr, default_modem_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;

#if 1 //Added by Quectel
   if (dev->driver_info->flags & FLAG_NOARP) {
       dev_info(&intf->dev, "Quectel EC25&EC21&EG91&EG95&EG06&EP06&EM06&EG12&EP12&EM12&EG16&EG18&BG96&AG35 work on RawIP mode\n");
       dev->net->flags |= IFF_NOARP;
       usb_control_msg(
           interface_to_usbdev(intf),
           usb_sndctrlpipe(interface_to_usbdev(intf), 0),
           0x22, //USB_CDC_REQ_SET_CONTROL_LINE_STATE
           0x21, //USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE
           1, //active CDC DTR
           intf->cur_altsetting->desc.bInterfaceNumber,
           NULL, 0, 100);
   }

   //to advoid module report mtu 1460, but rx 1500 bytes IP packets, and cause the customer's system crash
   //next setting can make usbnet.c:usbnet_change_mtu() do not modify rx_urb_size according to hard mtu
   dev->rx_urb_size = ETH_DATA_LEN + ETH_HLEN + 6;

#if defined(QUECTEL_WWAN_QMAP)
   if (qmap_mode > QUECTEL_WWAN_QMAP)
       qmap_mode = QUECTEL_WWAN_QMAP;

   if (!status)
   {
       sQmiWwanQmap *pQmapDev = (sQmiWwanQmap *)kzalloc(sizeof(sQmiWwanQmap), GFP_KERNEL);

       if (pQmapDev == NULL)
           return -ENODEV;

#ifdef QUECTEL_BRIDGE_MODE
       pQmapDev->bridge_mode = bridge_mode;
#endif
       pQmapDev->mpNetDev = dev;
       pQmapDev->link_state = 1;

       if (dev->driver_info->flags & FLAG_NOARP)
       {
           int idProduct = le16_to_cpu(dev->udev->descriptor.idProduct);
           int lte_a = (idProduct == 0x0306 || idProduct == 0x0512 || idProduct == 0x0620 || idProduct == 0x0800);

           pQmapDev->qmap_mode = qmap_mode;
           if (lte_a || dev->udev->speed == USB_SPEED_SUPER) {
               if (pQmapDev->qmap_mode == 0) {
                   pQmapDev->qmap_mode = 1; //force use QMAP
                   if(qmap_mode == 0)
                       qmap_mode = 1; //old quectel-CM only check sys/module/wwan0/parameters/qmap_mode
               }
           }

           if (pQmapDev->qmap_mode) {
               if (idProduct == 0x0121 || idProduct == 0x0125 || idProduct == 0x0435) //MDM9x07
                   dev->rx_urb_size = 4*1024;
               else if (lte_a || dev->udev->speed == USB_SPEED_SUPER)
                   dev->rx_urb_size = 32*1024;
               else
                   dev->rx_urb_size = 32*1024;

               //for these modules, if send pakcet before qmi_start_network, or cause host PC crash, or cause modules crash
               if (lte_a || dev->udev->speed == USB_SPEED_SUPER)
                   pQmapDev->link_state = 0;
           }
       }

       info->unused = (unsigned long)pQmapDev;
       dev->net->sysfs_groups[0] = &qmi_wwan_sysfs_attr_group;

       dev_info(&intf->dev, "rx_urb_size = %zd\n", dev->rx_urb_size);
   }
#endif
#endif

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);

   /* 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 int qmi_wwan_reset_resume(struct usb_interface *intf)
{
   dev_info(&intf->dev, "device do not support reset_resume\n");
   intf->needs_binding = 1;
   return -EOPNOTSUPP;
}

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_raw_ip_info = {
   .description   = "WWAN/QMI device",
   .flags       = FLAG_WWAN | FLAG_RX_ASSEMBLE | FLAG_NOARP | FLAG_SEND_ZLP,
   .bind       = qmi_wwan_bind,
   .unbind       = qmi_wwan_unbind,
   .manage_power   = qmi_wwan_manage_power,
#if defined(QUECTEL_WWAN_QMAP)
   .tx_fixup = qmap_qmi_wwan_tx_fixup,
   .rx_fixup = qmap_qmi_wwan_rx_fixup,
#else
   .tx_fixup = qmi_wwan_tx_fixup,
   .rx_fixup = qmi_wwan_rx_fixup,
#endif
};

/* 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

#define QMI_FIXED_RAWIP_INTF(vend, prod, num) \
   USB_DEVICE_INTERFACE_NUMBER(vend, prod, num), \
   .driver_info = (unsigned long)&qmi_wwan_raw_ip_info

static const struct usb_device_id products[] = {
#if 1 //Added by Quectel
   { QMI_FIXED_INTF(0x05C6, 0x9003, 4) }, /* Quectel UC20 */
   { QMI_FIXED_INTF(0x05C6, 0x9215, 4) }, /* Quectel EC20 (MDM9215) */
   { QMI_FIXED_RAWIP_INTF(0x2C7C, 0x0125, 4) }, /* Quectel EC20 (MDM9X07)/EC25/EG25 */
   { QMI_FIXED_RAWIP_INTF(0x2C7C, 0x0121, 4) }, /* Quectel EC21 */
   { QMI_FIXED_RAWIP_INTF(0x2C7C, 0x0191, 4) }, /* Quectel EG91 */
   { QMI_FIXED_RAWIP_INTF(0x2C7C, 0x0195, 4) }, /* Quectel EG95 */
   { QMI_FIXED_RAWIP_INTF(0x2C7C, 0x0306, 4) }, /* Quectel EG06/EP06/EM06 */
   { QMI_FIXED_RAWIP_INTF(0x2C7C, 0x0512, 4) }, /* Quectel EG12/EP12/EM12/EG16/EG18 */
   { QMI_FIXED_RAWIP_INTF(0x2C7C, 0x0296, 4) }, /* Quectel BG96 */
   { QMI_FIXED_RAWIP_INTF(0x2C7C, 0x0435, 4) }, /* Quectel AG35 */
   { QMI_FIXED_RAWIP_INTF(0x2C7C, 0x0620, 4) }, /* Quectel EG20 */
   { QMI_FIXED_RAWIP_INTF(0x2C7C, 0x0800, 4) }, /* Quectel RG500 */
#endif
   { }                   /* END */
};
MODULE_DEVICE_TABLE(usb, products);

static int qmi_wwan_probe(struct usb_interface *intf,
           const struct usb_device_id *prod)
{
   struct usb_device_id *id = (struct usb_device_id *)prod;

   /* Workaround to enable dynamic IDs. This disables usbnet
   * blacklisting functionality. Which, if required, can be
   * reimplemented here by using a magic "blacklist" value
   * instead of 0 in the static device id table
   */
   if (!id->driver_info) {
       dev_dbg(&intf->dev, "setting defaults for dynamic device id\n");
       id->driver_info = (unsigned long)&qmi_wwan_info;
   }

   if (intf->cur_altsetting->desc.bInterfaceClass != 0xff) {
       dev_info(&intf->dev, "Quectel module not qmi_wwan mode! please check 'at+qcfg=\"usbnet\"'\n");
       return -ENODEV;
   }

   return usbnet_probe(intf, id);
}

#if defined(QUECTEL_WWAN_QMAP)
static int qmap_qmi_wwan_probe(struct usb_interface *intf,
           const struct usb_device_id *prod)
{
   int status = qmi_wwan_probe(intf, prod);

   if (!status) {
       struct usbnet *dev = usb_get_intfdata(intf);
       struct qmi_wwan_state *info = (void *)&dev->data;
       sQmiWwanQmap *pQmapDev = (sQmiWwanQmap *)info->unused;
       unsigned i;

       if (pQmapDev) {
           if (pQmapDev->qmap_mode == 1) {
               pQmapDev->mpQmapNetDev[0] = dev->net;
           }
           else if (pQmapDev->qmap_mode > 1) {
               for (i = 0; i < pQmapDev->qmap_mode; i++) {
                   qmap_register_device(pQmapDev, i);
               }
           }
       }
   }

   return status;
}

static void qmap_qmi_wwan_disconnect(struct usb_interface *intf)
{
   struct usbnet *dev = usb_get_intfdata(intf);
   struct qmi_wwan_state *info = (void *)&dev->data;
   sQmiWwanQmap *pQmapDev = (sQmiWwanQmap *)info->unused;

   if (pQmapDev) {
       if (pQmapDev->qmap_mode > 1) {
           unsigned i;

           for (i = 0; i < pQmapDev->qmap_mode; i++) {
               qmap_unregister_device(pQmapDev, i);
           }
       }

       kfree(pQmapDev);
   }

   usbnet_disconnect(intf);
}
#endif

static struct usb_driver qmi_wwan_driver = {
   .name       = "qmi_wwan_q",
   .id_table   = products,
   .probe       = qmi_wwan_probe,
#if defined(QUECTEL_WWAN_QMAP)
   .probe       = qmap_qmi_wwan_probe,
   .disconnect   = qmap_qmi_wwan_disconnect,
#else
   .probe       = qmi_wwan_probe,
   .disconnect   = usbnet_disconnect,
#endif
   .suspend   = qmi_wwan_suspend,
   .resume       =   qmi_wwan_resume,
   .reset_resume = qmi_wwan_reset_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");
#define QUECTEL_WWAN_VERSION "Quectel_Linux&Android_QMI_WWAN_Driver_V1.1"
MODULE_VERSION(QUECTEL_WWAN_VERSION);

8、
Z:\rk3399-android-11\kernel\drivers\usb\serial\option.c

static int option_probe(struct usb_serial *serial,
           const struct usb_device_id *id)
{
   struct usb_interface_descriptor *iface_desc =
               &serial->interface->cur_altsetting->desc;
   unsigned long device_flags = id->driver_info;

   /*simcom*/
   if(serial->dev->descriptor.idVendor == SIMCOM_PRODUCT_VID_1E0E &&
   serial->dev->descriptor.idProduct == SIMCOM_PRODUCT_PID_9001 &&
   serial->interface->cur_altsetting->desc.bInterfaceNumber >= 4)
       return -ENODEV;

   printk("idVendor:%x,idProduct:%x,bInterfaceNumber:%d\n",serial->dev->descriptor.idVendor,serial->dev->descriptor.idProduct,serial->interface->cur_altsetting->desc.bInterfaceNumber);
   if (serial->dev->descriptor.idVendor == QUECTEL_VENDOR_ID &&
serial->dev->descriptor.idProduct == QUECTEL_PRODUCT_EC25 &&
   serial->interface->cur_altsetting->desc.bInterfaceNumber >= 4)
       return -ENODEV;

printk("ckkkkkkkkkk\n");

   /* Never bind to the CD-Rom emulation interface   */
   if (iface_desc->bInterfaceClass == USB_CLASS_MASS_STORAGE)
       return -ENODEV;

   /*
   * Don't bind reserved interfaces (like network ones) which often have
   * the same class/subclass/protocol as the serial interfaces. Look at
   * the Windows driver .INF files for reserved interface numbers.
   */
   if (iface_is_reserved(device_flags, iface_desc->bInterfaceNumber))
       return -ENODEV;

   /*
   * Allow matching on bNumEndpoints for devices whose interface numbers
   * can change (e.g. Quectel EP06).
   */
   if (device_flags & NUMEP2 && iface_desc->bNumEndpoints != 2)
       return -ENODEV;

/* Store the device flags so we can use them during attach. */
usb_set_serial_data(serial, (void *)device_flags);

return 0;
}

【几乎没有改动】
Z:\rk3399-android-11\kernel\drivers\usb\serial\qcserial.c

Z:\rk3399-android-11\kernel\drivers\usb\serial\usb_wwan.c

static struct urb *usb_wwan_setup_urb(struct usb_serial_port *port,
               int endpoint,
               int dir, void *ctx, char *buf, int len,
               void (*callback) (struct urb *))
{
   struct usb_serial *serial = port->serial;
   struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
   struct urb *urb;
   struct usb_device_descriptor *desc = &serial->dev->descriptor;

   urb = usb_alloc_urb(0, GFP_KERNEL);   /* No ISO */
   if (!urb)
       return NULL;

   usb_fill_bulk_urb(urb, serial->dev,
           usb_sndbulkpipe(serial->dev, endpoint) | dir,
           buf, len, callback, ctx);

if (intfdata->use_zlp && dir == USB_DIR_OUT)
urb->transfer_flags |= URB_ZERO_PACKET;

   if (dir == USB_DIR_OUT) {
       if ((desc->idVendor == cpu_to_le16(0x1286) &&
       desc->idProduct == cpu_to_le16(0x4e3c)))
           urb->transfer_flags |= URB_ZERO_PACKET;
       if (desc->idVendor == cpu_to_le16(0x2c7c))
           urb->transfer_flags |= URB_ZERO_PACKET;
   }
   return urb;
}

修改为：
static struct urb *usb_wwan_setup_urb(struct usb_serial_port *port,
               int endpoint,
               int dir, void *ctx, char *buf, int len,
               void (*callback) (struct urb *))
{
   struct usb_serial *serial = port->serial;
   struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
   struct urb *urb;
   struct usb_device_descriptor *desc = &serial->dev->descriptor;

   urb = usb_alloc_urb(0, GFP_KERNEL);   /* No ISO */
   if (!urb)
       return NULL;

   usb_fill_bulk_urb(urb, serial->dev,
           usb_sndbulkpipe(serial->dev, endpoint) | dir,
           buf, len, callback, ctx);

if (intfdata->use_zlp && dir == USB_DIR_OUT)
urb->transfer_flags |= URB_ZERO_PACKET;

   if (dir == USB_DIR_OUT) {
#define DEV_MATCH(udesc, vid, pid) \
   (udesc->idVendor == cpu_to_le16(vid) && desc->idProduct == cpu_to_le16(pid))
       if (DEV_MATCH(desc, 0x1286, 0x4e3c) ||
       DEV_MATCH(desc, 0x05C6, 0x9090) ||
       DEV_MATCH(desc, 0x05C6, 0x9003) ||
       DEV_MATCH(desc, 0x05C6, 0x9215) ||
       (desc->idVendor == cpu_to_le16(0x2C7C)))
           urb->transfer_flags |= URB_ZERO_PACKET;
#undef DEV_MATCH
   }

return urb;
}

9、
Z:\rk3399-android-11\system\core\init\devices.cpp
void DeviceHandler::HandleUevent(const Uevent& uevent) {
if (uevent.action == "add" || uevent.action == "change" || uevent.action == "online") {
FixupSysPermissions(uevent.path, uevent.subsystem);
}

// if it's not a /dev device, nothing to do
if (uevent.major < 0 || uevent.minor < 0) return;

std::string devpath;
std::vector<std::string> links;
bool block = false;

if (uevent.subsystem == "block") {
block = true;
devpath = "/dev/block/" + Basename(uevent.path);

if (StartsWith(uevent.path, "/devices")) {
links = GetBlockDeviceSymlinks(uevent);
}
} else if (const auto subsystem =
std::find(subsystems_.cbegin(), subsystems_.cend(), uevent.subsystem);
subsystem != subsystems_.cend()) {
devpath = subsystem->ParseDevPath(uevent);
} else if (uevent.subsystem == "usb") {
if (!uevent.device_name.empty()) {
devpath = "/dev/" + uevent.device_name;
} else {
// This imitates the file system that would be created
// if we were using devfs instead.
// Minors are broken up into groups of 128, starting at "001"
int bus_id = uevent.minor / 128 + 1;
int device_id = uevent.minor % 128 + 1;
devpath = StringPrintf("/dev/bus/usb/%03d/%03d", bus_id, device_id);
}

// add by quectel for mknod /dev/cdc-wdm0
} else if (uevent.subsystem == "usbmisc" && !uevent.device_name.empty()) {
devpath = "/dev/" + uevent.device_name;

} else if (uevent.subsystem == "usbmisc" && !uevent.device_name.empty()) {
devpath = "/dev/" + uevent.device_name;

//PLOG(ERROR) << "Failed to symlink " << devpath << " to " << link << ", which already links to: " << link_path;
PLOG(ERROR) << "2024/1/5 22:56 wenyuanbo " << devpath ;
} else if (StartsWith(uevent.subsystem, "usb")) {
// ignore other USB events
return;
} else {
devpath = "/dev/" + Basename(uevent.path);
}

mkdir_recursive(Dirname(devpath), 0755);

HandleDevice(uevent.action, devpath, block, uevent.major, uevent.minor, links);

// Duplicate /dev/ashmem device and name it /dev/ashmem<boot_id>.
// TODO(b/111903542): remove once all users of /dev/ashmem are migrated to libcutils API.
HandleAshmemUevent(uevent);
}

参考资料：
https://download.csdn.net/download/seasonfangjing/86247556
RK356X android11 移远EC20 modem支持

对应工程设置BOARD_HAS_EC20_MODEM := true

device/rockchip/rk356x/itx68/BoardConfig.mk
BOARD_HAS_EC20_MODEM := true

system/core/init
diff --git a/init/devices.cpp b/init/devices.cpp
index 9fbec641b..e3c823d05 100644
--- a/init/devices.cpp
+++ b/init/devices.cpp
@@ -492,7 +492,10 @@ void DeviceHandler::HandleUevent(const Uevent& uevent) {
int device_id = uevent.minor % 128 + 1;
devpath = StringPrintf("/dev/bus/usb/%03d/%03d", bus_id, device_id);
}
- } else if (StartsWith(uevent.subsystem, "usb")) {
+ } else if (uevent.subsystem == "usbmisc" && !uevent.device_name.empty()) {
+ devpath = "/dev/" + uevent.device_name;
+ }
+ else if (StartsWith(uevent.subsystem, "usb")) {
// ignore other USB events
return;
} else {

device/rockchip
--- a/overlay/frameworks/base/core/res/res/values/config.xml
+++ b/overlay/frameworks/base/core/res/res/values/config.xml
@@ -31,6 +31,14 @@

<string-array translatable="false" name="networkAttributes">
<item>"wifi,1,1,2,-1,true"</item>
+ <item>"mobile,0,0,0,-1,true"</item>
+ <item>"mobile_mms,2,0,2,60000,true"</item>
+ <item>"mobile_supl,3,0,2,60000,true"</item>
+ <item>"mobile_dun,4,0,2,60000,true"</item>
+ <item>"mobile_hipri,5,0,3,60000,true"</item>
+ <item>"mobile_fota,10,0,2,60000,true"</item>
+ <item>"mobile_ims,11,0,2,60000,true"</item>
+ <item>"mobile_cbs,12,0,2,60000,true"</item>
<item>"bluetooth,7,7,0,-1,true"</item>

【可选参考】
https://blog.csdn.net/longmin96/article/details/122687865
RK3568-ANDROID11-4G-EC20-系统篇（移远模块）

【可选参考，需要会员下载库文件】
https://blog.csdn.net/yjz_0314/article/details/134142847
Android11.0系统中适配EC20模块4G及GPS功能

参考资料：
http://www.friendlyelec.com.cn/agent.asp
http://www.friendlyelec.com.cn/
https://download.friendlyelec.com/NanoPC-T4
https://wiki.friendlyelec.com/wiki/index.php/NanoPC-T4/zh#.E4.B8.8B.E8.BD.BDAndroid10.E6.BA.90.E4.BB.A3.E7.A0.81

https://item.taobao.com/item.htm?spm=a1z09.2.0.0.37562e8dcotDm6&id=570312633249&_u=7ju3ku004a
友善NanoPC-T4瑞芯微RK3399开发板ROS双摄4K播放开源AI智能安卓10

WiKi维基教程（固件介绍，使用说明，操作步骤等）
http://wiki.friendlyelec.com/wiki/index.php/NanoPC-T4
系统固件下载
https://dl.friendlyelec.com/nanopct4
原理图(pdf格式)
http://wiki.friendlyelec.com/wiki/images/e/e0/NanoPC-T4-1902-Schematic.pdf
尺寸图(dxf格式)
http://wiki.friendlyelec.com/wiki/images/b/bc/NanoPC-T4_1802_Drawing%28dxf%29.zip

http://www.friendlyelec.com.cn/nanopi-m4.asp
NanoPi M4 | NanoPi M4V2

https://wiki.friendlyelec.com/wiki/index.php/NanoPi_M4/zh
15.3 编译Android10源代码
15.3.1 下载Android10源代码
有以下两种途径获取 Android10 的源代码，都需要联网:

使用网盘里的git repo压缩包
网盘下载地址: 点击进入

https://download.friendlyelec.com/NanoPiM4
https://pan.baidu.com/share/init?surl=oBLn9H31hILJKEPQXgrUog
提取码：yn6r