openwrt 18.06 ec20 R2.0 qmi 4G拨号上网

记录18.06 下驱动 EC20

openwrt 18.06 已经支持EC20 这个模块的识别了

只要在make menuconfig下选中以下模块, 是直接可以用AT命令读取到信息的,只是无法用qmi 应用程序获取到IP地址

Kernel modules  --->
	USB Support  --->	
		-*- kmod-usb-core............................................ Support for USB
		-*- kmod-usb-net............... Kernel modules for USB-to-Ethernet convertors
		 -*-   kmod-usb-net-qmi-wwan.................................... QMI WWAN drive
		<*> kmod-usb-ohci............................... Support for OHCI controllers
		<*>   kmod-usb-serial-option................... Support for Option HSDPA modem

无法获取IP地址主要是qmi 用的RAW-IP mode 没有在

[KERNEL]/drivers/net/usb/qmi_wwan.c

文件里面驱动起来,把下面补丁打入即可

https://download.csdn.net/download/jianzhizuo/10748784

@@ -175,6 +175,21 @@
  * to 00:a0:c6:00:00:00 despite the host address being different.
  * This function will also fixup such packets.
  */
+struct sk_buff *qmi_wwan_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
+{
+	if (dev->udev->descriptor.idVendor != cpu_to_le16(0x2C7C)) return skb;
+	
+	// Skip Ethernet header from message
+	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;
+}
+
 static int qmi_wwan_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
 {
 	struct qmi_wwan_state *info = (void *)&dev->data;
@@ -445,6 +460,20 @@
 	}
 	dev->net->netdev_ops = &qmi_wwan_netdev_ops;
 	dev->net->sysfs_groups[0] = &qmi_wwan_sysfs_attr_group;
+#if 1 //Added by Quectel
+	if (dev->udev->descriptor.idVendor == cpu_to_le16(0x2C7C)) {
+		dev_info(&intf->dev,  "Quectel  EC25&EC21&EC20R2.0&EG91&EG95&EG06&EP06&EM06&BG96 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);
+	}
+#endif	
 err:
 	return status;
 }
@@ -536,6 +565,7 @@
 	.unbind		= qmi_wwan_unbind,
 	.manage_power	= qmi_wwan_manage_power,
 	.rx_fixup       = qmi_wwan_rx_fixup,
+	.tx_fixup       = qmi_wwan_tx_fixup,	
 };
 
 static const struct driver_info	qmi_wwan_info_quirk_dtr = {
@@ -545,6 +575,7 @@
 	.unbind		= qmi_wwan_unbind,
 	.manage_power	= qmi_wwan_manage_power,
 	.rx_fixup       = qmi_wwan_rx_fixup,
+	.tx_fixup       = qmi_wwan_tx_fixup,		
 	.data           = QMI_WWAN_QUIRK_DTR,
 }

quectel-CM 这个应用程序, 直接改成openwrt应用程序编译进代码就可以获取到IP了.
不过用原厂给的直接编译出来 是不会主动添加 DNS的,需要手动去/etc/resolv.conf dns 才能上网
下面这个是改好的包,解压放在package下面就行了,也会主动添加DNS

包下载地址: https://download.csdn.net/download/jianzhizuo/10749215
然后上成果图