diff --git a/drivers/net/usb/qmi_wwan.c b/drivers/net/usb/qmi_wwan.c
index 602dc66..9bbe38c 100644
--- a/drivers/net/usb/qmi_wwan.c
+++ b/drivers/net/usb/qmi_wwan.c
@@ -58,6 +58,67 @@ 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};
 
+#if 1 //add by Quectel
+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;
+}
+
+#include <linux/version.h>
+#if (LINUX_VERSION_CODE < KERNEL_VERSION( 3,9,1 ))
+static int qmi_wwan_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
+{
+	__be16 proto;
+
+	if (dev->udev->descriptor.idVendor != cpu_to_le16(0x2C7C))
+		return 1;
+
+	/* 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);
+fix_dest:
+	memcpy(eth_hdr(skb)->h_dest, dev->net->dev_addr, ETH_ALEN);
+	return 1;
+}
+#endif
+#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
@@ -348,6 +409,21 @@ next_desc:
 		dev->net->dev_addr[0] &= 0xbf;	/* clear "IP" bit */
 	}
 	dev->net->netdev_ops = &qmi_wwan_netdev_ops;
+
+#if 1 //add by Quectel
+	if (dev->udev->descriptor.idVendor == cpu_to_le16(0x2C7C)) {
+		dev_info(&intf->dev,  "Quectel EC21&EC25 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,
+			0x21,
+			1, //active CDC DTR
+			intf->cur_altsetting->desc.bInterfaceNumber,
+			NULL, 0, 100);
+		}
+#endif
 err:
 	return status;
 }
@@ -432,6 +508,12 @@ static const struct driver_info	qmi_wwan_info = {
 	.bind		= qmi_wwan_bind,
 	.unbind		= qmi_wwan_unbind,
 	.manage_power	= qmi_wwan_manage_power,
+#if 1 //add by Quectel
+	.tx_fixup       = qmi_wwan_tx_fixup,
+#if (LINUX_VERSION_CODE < KERNEL_VERSION( 3,9,1 ))
+	.rx_fixup       = qmi_wwan_rx_fixup,
+#endif
+#endif
 	.rx_fixup       = qmi_wwan_rx_fixup,
 };
 
@@ -451,6 +533,12 @@ static const struct driver_info	qmi_wwan_info = {
 	QMI_FIXED_INTF(vend, prod, 0)
 
 static const struct usb_device_id products[] = {
+#if 1 //add by Quectel
+	{ QMI_FIXED_INTF(0x05C6, 0x9003, 4) },  /* Quectel UC20 */
+	{ QMI_FIXED_INTF(0x05C6, 0x9215, 4) },  /* Quectel EC20 */
+	{ QMI_FIXED_INTF(0x2C7C, 0x0125, 4) },  /* Quectel EC25 */
+	{ QMI_FIXED_INTF(0x2C7C, 0x0121, 4) },  /* Quectel EC21 */
+#endif
 	/* 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),
@@ -814,7 +902,7 @@ static const struct usb_device_id products[] = {
 	{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_GOBI_DEVICE(0x05c6, 0x9215)},	/* Acer Gobi 2000 Modem device (VP413) */
 	{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) */
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 50faef4..fd626d6 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -1405,6 +1405,10 @@ made_compressed_probe:
 				usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
 				NULL, acm->writesize, acm_write_bulk, snd);
 		snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+#if 1 //add by Quectel
+		if (usb_dev->descriptor.idVendor == 0x1519 && usb_dev->descriptor.idProduct == 0x0020)
+			snd->urb->transfer_flags |= URB_ZERO_PACKET;
+#endif
 		snd->instance = acm;
 	}
 
diff --git a/drivers/usb/serial/option.c b/drivers/usb/serial/option.c
index f0c0c53..b2e8229 100644
--- a/drivers/usb/serial/option.c
+++ b/drivers/usb/serial/option.c
@@ -601,6 +601,13 @@ static const struct option_blacklist_info sierra_mc73xx_blacklist = {
 };
 
 static const struct usb_device_id option_ids[] = {
+#if 1 //Added by Quectel
+	{ USB_DEVICE(0x05C6, 0x9090) }, /* Quectel UC15 */
+	{ USB_DEVICE(0x05C6, 0x9003) }, /* Quectel UC20 */
+	{ USB_DEVICE(0x05C6, 0x9215) }, /* Quectel EC20 */
+	{ USB_DEVICE(0x2C7C, 0x0125) }, /* Quectel EC25 */
+	{ USB_DEVICE(0x2C7C, 0x0121) }, /* Quectel EC21 */
+#endif
 	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_COLT) },
 	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_RICOLA) },
 	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_RICOLA_LIGHT) },
@@ -1801,6 +1808,9 @@ static struct usb_serial_driver option_1port_device = {
 #ifdef CONFIG_PM
 	.suspend           = usb_wwan_suspend,
 	.resume            = usb_wwan_resume,
+#if 1 //add by Quectel
+	.reset_resume   = usb_wwan_resume,
+#endif
 #endif
 };
 
@@ -1822,6 +1832,21 @@ static int option_probe(struct usb_serial *serial,
 	struct usb_device_descriptor *dev_desc = &serial->dev->descriptor;
 	const struct option_blacklist_info *blacklist;
 
+#if 1 //Added by Quectel
+	//Quectel UC20's interface 4 can be used as USB Network device
+	if (serial->dev->descriptor.idVendor == cpu_to_le16(0x05C6) && serial->dev->descriptor.idProduct == cpu_to_le16(0x9003)
+		&& serial->interface->cur_altsetting->desc.bInterfaceNumber >= 4)
+		return -ENODEV;
+	//Quectel EC20's interface 4 can be used as USB Network device
+	if (serial->dev->descriptor.idVendor == cpu_to_le16(0x05C6) && serial->dev->descriptor.idProduct == cpu_to_le16(0x9215)
+		&& serial->interface->cur_altsetting->desc.bInterfaceNumber >= 4)
+		return -ENODEV;
+	//Quectel EC25&EC21 's interface 4 can be used as USB Network device
+	if (serial->dev->descriptor.idVendor == cpu_to_le16(0x2C7C)
+		&& serial->interface->cur_altsetting->desc.bInterfaceNumber >= 4)
+		return -ENODEV;
+#endif
+
 	/* Never bind to the CD-Rom emulation interface	*/
 	if (iface_desc->bInterfaceClass == 0x08)
 		return -ENODEV;
diff --git a/drivers/usb/serial/qcserial.c b/drivers/usb/serial/qcserial.c
index 9c63897..7417c69 100644
--- a/drivers/usb/serial/qcserial.c
+++ b/drivers/usb/serial/qcserial.c
@@ -90,7 +90,7 @@ static const struct usb_device_id id_table[] = {
 	{USB_DEVICE(0x03f0, 0x241d)},	/* HP Gobi 2000 QDL device (VP412) */
 	{USB_DEVICE(0x03f0, 0x251d)},	/* HP Gobi 2000 Modem device (VP412) */
 	{USB_DEVICE(0x05c6, 0x9214)},	/* Acer Gobi 2000 QDL device (VP413) */
-	{USB_DEVICE(0x05c6, 0x9215)},	/* Acer Gobi 2000 Modem device (VP413) */
+	//{USB_DEVICE(0x05c6, 0x9215)},	/* Acer Gobi 2000 Modem device (VP413) */
 	{USB_DEVICE(0x05c6, 0x9264)},	/* Asus Gobi 2000 QDL device (VR305) */
 	{USB_DEVICE(0x05c6, 0x9265)},	/* Asus Gobi 2000 Modem device (VR305) */
 	{USB_DEVICE(0x05c6, 0x9234)},	/* Top Global Gobi 2000 QDL device (VR306) */
diff --git a/drivers/usb/serial/usb_wwan.c b/drivers/usb/serial/usb_wwan.c
index 2f805cb..8d006a3 100644
--- a/drivers/usb/serial/usb_wwan.c
+++ b/drivers/usb/serial/usb_wwan.c
@@ -471,6 +471,19 @@ static struct urb *usb_wwan_setup_urb(struct usb_serial_port *port,
 			  usb_sndbulkpipe(serial->dev, endpoint) | dir,
 			  buf, len, callback, ctx);
 
+#if 1 //Added by Quectel for Zero Packet
+	if (dir == USB_DIR_OUT) {
+		if (serial->dev->descriptor.idVendor == cpu_to_le16(0x05C6) && serial->dev->descriptor.idProduct == cpu_to_le16(0x9090))
+			urb->transfer_flags |= URB_ZERO_PACKET;
+		if (serial->dev->descriptor.idVendor == cpu_to_le16(0x05C6) && serial->dev->descriptor.idProduct == cpu_to_le16(0x9003))
+			urb->transfer_flags |= URB_ZERO_PACKET;
+		if (serial->dev->descriptor.idVendor == cpu_to_le16(0x05C6) && serial->dev->descriptor.idProduct == cpu_to_le16(0x9215))
+			urb->transfer_flags |= URB_ZERO_PACKET;
+		if (serial->dev->descriptor.idVendor == cpu_to_le16(0x2C7C))
+			urb->transfer_flags |= URB_ZERO_PACKET;
+	}
+#endif
+
 	return urb;
 }
 
