kernel/generic: 3.18, 4.y: Add support for Quectel EC20 Mini PCIe module

* both patches (qcserial/qmi_wwan) were submitted upstream[1,2]
* build tested on 3.18 and 4.1
* run tested on imx6 platform with 4.1

1. http://article.gmane.org/gmane.linux.usb.general/132998
2. http://article.gmane.org/gmane.linux.usb.general/133113

Signed-off-by: Petr Štetiar <ynezz@true.cz>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@47567 3c298f89-4303-0410-b956-a3cf2f4a3e73

6 files changed, 660 insertions, 0 deletions

diff --git a/target/linux/generic/patches-3.18/192-USB-qcserial-Add-support-for-Quectel-EC20-Mini-PCIe-.patch b/target/linux/generic/patches-3.18/192-USB-qcserial-Add-support-for-Quectel-EC20-Mini-PCIe-.patch
new file mode 100644
index 0000000000..f56941cbb8
--- /dev/null
+++ b/target/linux/generic/patches-3.18/192-USB-qcserial-Add-support-for-Quectel-EC20-Mini-PCIe-.patch
@@ -0,0 +1,119 @@
+From 128524b9db3e4f4245226852bee771bd03db75be Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Petr=20=C5=A0tetiar?= <ynezz@true.cz>
+Date: Tue, 3 Nov 2015 11:01:42 +0100
+Subject: [PATCH 1/2] USB: qcserial: Add support for Quectel EC20 Mini PCIe
+ module
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+It seems like this device has same vendor and product IDs as G2K
+devices, but it has different number of interfaces(4 vs 5) and also
+different interface layout which makes it currently unusable:
+
+	usbcore: registered new interface driver qcserial
+	usbserial: USB Serial support registered for Qualcomm USB modem
+	usb 2-1.2: unknown number of interfaces: 5
+
+lsusb output:
+
+	Bus 002 Device 003: ID 05c6:9215 Qualcomm, Inc. Acer Gobi 2000 Wireless
+	Device Descriptor:
+	  bLength                18
+	  bDescriptorType         1
+	  bcdUSB               2.00
+	  bDeviceClass            0 (Defined at Interface level)
+	  bDeviceSubClass         0
+	  bDeviceProtocol         0
+	  bMaxPacketSize0        64
+	  idVendor           0x05c6 Qualcomm, Inc.
+	  idProduct          0x9215 Acer Gobi 2000 Wireless Modem
+	  bcdDevice            2.32
+	  iManufacturer           1 Quectel
+	  iProduct                2 Quectel LTE Module
+	  iSerial                 0
+	  bNumConfigurations      1
+	  Configuration Descriptor:
+	    bLength                 9
+	    bDescriptorType         2
+	    wTotalLength          209
+	    bNumInterfaces          5
+	    bConfigurationValue     1
+	    iConfiguration          0
+	    bmAttributes         0xa0
+	      (Bus Powered)
+	      Remote Wakeup
+	    MaxPower              500mA
+
+Signed-off-by: Petr Štetiar <ynezz@true.cz>
+---
+ drivers/usb/serial/qcserial.c |   39 +++++++++++++++++++++++++++++++++++++++
+ 1 file changed, 39 insertions(+)
+
+diff --git a/drivers/usb/serial/qcserial.c b/drivers/usb/serial/qcserial.c
+index ebcec8c..d462132 100644
+--- a/drivers/usb/serial/qcserial.c
++++ b/drivers/usb/serial/qcserial.c
+@@ -22,6 +22,8 @@
+ #define DRIVER_AUTHOR "Qualcomm Inc"
+ #define DRIVER_DESC "Qualcomm USB Serial driver"
+ 
++#define QUECTEL_EC20_IDPRODUCT 0x9215
++
+ /* standard device layouts supported by this driver */
+ enum qcserial_layouts {
+ 	QCSERIAL_G2K = 0,	/* Gobi 2000 */
+@@ -167,6 +169,38 @@ static const struct usb_device_id id_table[] = {
+ };
+ MODULE_DEVICE_TABLE(usb, id_table);
+ 
++static int handle_quectel_ec20(struct device *dev, int ifnum)
++{
++	int altsetting = 0;
++
++	/*
++	 * Quectel EC20 Mini PCIe LTE module layout:
++	 * 0: DM/DIAG (use libqcdm from ModemManager for communication)
++	 * 1: NMEA
++	 * 2: AT-capable modem port
++	 * 3: Modem interface
++	 * 4: NDIS
++	 */
++	switch (ifnum) {
++	case 0:
++		dev_dbg(dev, "Quectel EC20 DM/DIAG interface found\n");
++		break;
++	case 1:
++		dev_dbg(dev, "Quectel EC20 NMEA GPS interface found\n");
++		break;
++	case 2:
++	case 3:
++		dev_dbg(dev, "Quectel EC20 Modem port found\n");
++		break;
++	case 4:
++		/* Don't claim the QMI/net interface */
++		altsetting = -1;
++		break;
++	}
++
++	return altsetting;
++}
++
+ static int qcprobe(struct usb_serial *serial, const struct usb_device_id *id)
+ {
+ 	struct usb_host_interface *intf = serial->interface->cur_altsetting;
+@@ -235,6 +269,11 @@ static int qcprobe(struct usb_serial *serial, const struct usb_device_id *id)
+ 			altsetting = -1;
+ 		break;
+ 	case QCSERIAL_G2K:
++		if (nintf == 5 && id->idProduct == QUECTEL_EC20_IDPRODUCT) {
++			altsetting = handle_quectel_ec20(dev, ifnum);
++			goto done;
++		}
++
+ 		/*
+ 		 * Gobi 2K+ USB layout:
+ 		 * 0: QMI/net
+-- 
+1.7.9.5
+
diff --git a/target/linux/generic/patches-3.18/193-USB-qmi_wwan-Add-quirk-for-Quectel-EC20-Mini-PCIe-mo.patch b/target/linux/generic/patches-3.18/193-USB-qmi_wwan-Add-quirk-for-Quectel-EC20-Mini-PCIe-mo.patch
new file mode 100644
index 0000000000..3b08571361
--- /dev/null
+++ b/target/linux/generic/patches-3.18/193-USB-qmi_wwan-Add-quirk-for-Quectel-EC20-Mini-PCIe-mo.patch
@@ -0,0 +1,101 @@
+From fe29727caa7fe434fcb3166df2a62672bc516b54 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Petr=20=C5=A0tetiar?= <ynezz@true.cz>
+Date: Wed, 4 Nov 2015 16:23:37 +0100
+Subject: [PATCH 2/2] USB: qmi_wwan: Add quirk for Quectel EC20 Mini PCIe
+ module
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+This device has same vendor and product IDs as G2K devices, but it has
+different number of interfaces(4 vs 5) and also different interface
+layout where EC20 has QMI on interface 4 instead of 0.
+
+lsusb output:
+
+	Bus 002 Device 003: ID 05c6:9215 Qualcomm, Inc. Acer Gobi 2000
+	Device Descriptor:
+	  bLength                18
+	  bDescriptorType         1
+	  bcdUSB               2.00
+	  bDeviceClass            0 (Defined at Interface level)
+	  bDeviceSubClass         0
+	  bDeviceProtocol         0
+	  bMaxPacketSize0        64
+	  idVendor           0x05c6 Qualcomm, Inc.
+	  idProduct          0x9215 Acer Gobi 2000 Wireless Modem
+	  bcdDevice            2.32
+	  iManufacturer           1 Quectel
+	  iProduct                2 Quectel LTE Module
+	  iSerial                 0
+	  bNumConfigurations      1
+	  Configuration Descriptor:
+	    bLength                 9
+	    bDescriptorType         2
+	    wTotalLength          209
+	    bNumInterfaces          5
+	    bConfigurationValue     1
+	    iConfiguration          0
+	    bmAttributes         0xa0
+	      (Bus Powered)
+	      Remote Wakeup
+	    MaxPower              500mA
+
+Signed-off-by: Petr Štetiar <ynezz@true.cz>
+---
+ drivers/net/usb/qmi_wwan.c |   21 +++++++++++++++++++++
+ 1 file changed, 21 insertions(+)
+
+diff --git a/drivers/net/usb/qmi_wwan.c b/drivers/net/usb/qmi_wwan.c
+index 2a7c1be..b81a32c 100644
+--- a/drivers/net/usb/qmi_wwan.c
++++ b/drivers/net/usb/qmi_wwan.c
+@@ -822,6 +822,7 @@ static const struct usb_device_id products[] = {
+ 	{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) */
+@@ -853,10 +854,24 @@ static const struct usb_device_id products[] = {
+ };
+ 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
+@@ -868,6 +883,12 @@ static int qmi_wwan_probe(struct usb_interface *intf,
+ 		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);
+ }
+ 
+-- 
+1.7.9.5
+
diff --git a/target/linux/generic/patches-4.1/192-USB-qcserial-Add-support-for-Quectel-EC20-Mini-PCIe-.patch b/target/linux/generic/patches-4.1/192-USB-qcserial-Add-support-for-Quectel-EC20-Mini-PCIe-.patch
new file mode 100644
index 0000000000..f56941cbb8
--- /dev/null
+++ b/target/linux/generic/patches-4.1/192-USB-qcserial-Add-support-for-Quectel-EC20-Mini-PCIe-.patch
@@ -0,0 +1,119 @@
+From 128524b9db3e4f4245226852bee771bd03db75be Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Petr=20=C5=A0tetiar?= <ynezz@true.cz>
+Date: Tue, 3 Nov 2015 11:01:42 +0100
+Subject: [PATCH 1/2] USB: qcserial: Add support for Quectel EC20 Mini PCIe
+ module
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+It seems like this device has same vendor and product IDs as G2K
+devices, but it has different number of interfaces(4 vs 5) and also
+different interface layout which makes it currently unusable:
+
+	usbcore: registered new interface driver qcserial
+	usbserial: USB Serial support registered for Qualcomm USB modem
+	usb 2-1.2: unknown number of interfaces: 5
+
+lsusb output:
+
+	Bus 002 Device 003: ID 05c6:9215 Qualcomm, Inc. Acer Gobi 2000 Wireless
+	Device Descriptor:
+	  bLength                18
+	  bDescriptorType         1
+	  bcdUSB               2.00
+	  bDeviceClass            0 (Defined at Interface level)
+	  bDeviceSubClass         0
+	  bDeviceProtocol         0
+	  bMaxPacketSize0        64
+	  idVendor           0x05c6 Qualcomm, Inc.
+	  idProduct          0x9215 Acer Gobi 2000 Wireless Modem
+	  bcdDevice            2.32
+	  iManufacturer           1 Quectel
+	  iProduct                2 Quectel LTE Module
+	  iSerial                 0
+	  bNumConfigurations      1
+	  Configuration Descriptor:
+	    bLength                 9
+	    bDescriptorType         2
+	    wTotalLength          209
+	    bNumInterfaces          5
+	    bConfigurationValue     1
+	    iConfiguration          0
+	    bmAttributes         0xa0
+	      (Bus Powered)
+	      Remote Wakeup
+	    MaxPower              500mA
+
+Signed-off-by: Petr Štetiar <ynezz@true.cz>
+---
+ drivers/usb/serial/qcserial.c |   39 +++++++++++++++++++++++++++++++++++++++
+ 1 file changed, 39 insertions(+)
+
+diff --git a/drivers/usb/serial/qcserial.c b/drivers/usb/serial/qcserial.c
+index ebcec8c..d462132 100644
+--- a/drivers/usb/serial/qcserial.c
++++ b/drivers/usb/serial/qcserial.c
+@@ -22,6 +22,8 @@
+ #define DRIVER_AUTHOR "Qualcomm Inc"
+ #define DRIVER_DESC "Qualcomm USB Serial driver"
+ 
++#define QUECTEL_EC20_IDPRODUCT 0x9215
++
+ /* standard device layouts supported by this driver */
+ enum qcserial_layouts {
+ 	QCSERIAL_G2K = 0,	/* Gobi 2000 */
+@@ -167,6 +169,38 @@ static const struct usb_device_id id_table[] = {
+ };
+ MODULE_DEVICE_TABLE(usb, id_table);
+ 
++static int handle_quectel_ec20(struct device *dev, int ifnum)
++{
++	int altsetting = 0;
++
++	/*
++	 * Quectel EC20 Mini PCIe LTE module layout:
++	 * 0: DM/DIAG (use libqcdm from ModemManager for communication)
++	 * 1: NMEA
++	 * 2: AT-capable modem port
++	 * 3: Modem interface
++	 * 4: NDIS
++	 */
++	switch (ifnum) {
++	case 0:
++		dev_dbg(dev, "Quectel EC20 DM/DIAG interface found\n");
++		break;
++	case 1:
++		dev_dbg(dev, "Quectel EC20 NMEA GPS interface found\n");
++		break;
++	case 2:
++	case 3:
++		dev_dbg(dev, "Quectel EC20 Modem port found\n");
++		break;
++	case 4:
++		/* Don't claim the QMI/net interface */
++		altsetting = -1;
++		break;
++	}
++
++	return altsetting;
++}
++
+ static int qcprobe(struct usb_serial *serial, const struct usb_device_id *id)
+ {
+ 	struct usb_host_interface *intf = serial->interface->cur_altsetting;
+@@ -235,6 +269,11 @@ static int qcprobe(struct usb_serial *serial, const struct usb_device_id *id)
+ 			altsetting = -1;
+ 		break;
+ 	case QCSERIAL_G2K:
++		if (nintf == 5 && id->idProduct == QUECTEL_EC20_IDPRODUCT) {
++			altsetting = handle_quectel_ec20(dev, ifnum);
++			goto done;
++		}
++
+ 		/*
+ 		 * Gobi 2K+ USB layout:
+ 		 * 0: QMI/net
+-- 
+1.7.9.5
+
diff --git a/target/linux/generic/patches-4.1/193-USB-qmi_wwan-Add-quirk-for-Quectel-EC20-Mini-PCIe-mo.patch b/target/linux/generic/patches-4.1/193-USB-qmi_wwan-Add-quirk-for-Quectel-EC20-Mini-PCIe-mo.patch
new file mode 100644
index 0000000000..3b08571361
--- /dev/null
+++ b/target/linux/generic/patches-4.1/193-USB-qmi_wwan-Add-quirk-for-Quectel-EC20-Mini-PCIe-mo.patch
@@ -0,0 +1,101 @@
+From fe29727caa7fe434fcb3166df2a62672bc516b54 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Petr=20=C5=A0tetiar?= <ynezz@true.cz>
+Date: Wed, 4 Nov 2015 16:23:37 +0100
+Subject: [PATCH 2/2] USB: qmi_wwan: Add quirk for Quectel EC20 Mini PCIe
+ module
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+This device has same vendor and product IDs as G2K devices, but it has
+different number of interfaces(4 vs 5) and also different interface
+layout where EC20 has QMI on interface 4 instead of 0.
+
+lsusb output:
+
+	Bus 002 Device 003: ID 05c6:9215 Qualcomm, Inc. Acer Gobi 2000
+	Device Descriptor:
+	  bLength                18
+	  bDescriptorType         1
+	  bcdUSB               2.00
+	  bDeviceClass            0 (Defined at Interface level)
+	  bDeviceSubClass         0
+	  bDeviceProtocol         0
+	  bMaxPacketSize0        64
+	  idVendor           0x05c6 Qualcomm, Inc.
+	  idProduct          0x9215 Acer Gobi 2000 Wireless Modem
+	  bcdDevice            2.32
+	  iManufacturer           1 Quectel
+	  iProduct                2 Quectel LTE Module
+	  iSerial                 0
+	  bNumConfigurations      1
+	  Configuration Descriptor:
+	    bLength                 9
+	    bDescriptorType         2
+	    wTotalLength          209
+	    bNumInterfaces          5
+	    bConfigurationValue     1
+	    iConfiguration          0
+	    bmAttributes         0xa0
+	      (Bus Powered)
+	      Remote Wakeup
+	    MaxPower              500mA
+
+Signed-off-by: Petr Štetiar <ynezz@true.cz>
+---
+ drivers/net/usb/qmi_wwan.c |   21 +++++++++++++++++++++
+ 1 file changed, 21 insertions(+)
+
+diff --git a/drivers/net/usb/qmi_wwan.c b/drivers/net/usb/qmi_wwan.c
+index 2a7c1be..b81a32c 100644
+--- a/drivers/net/usb/qmi_wwan.c
++++ b/drivers/net/usb/qmi_wwan.c
+@@ -822,6 +822,7 @@ static const struct usb_device_id products[] = {
+ 	{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) */
+@@ -853,10 +854,24 @@ static const struct usb_device_id products[] = {
+ };
+ 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
+@@ -868,6 +883,12 @@ static int qmi_wwan_probe(struct usb_interface *intf,
+ 		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);
+ }
+ 
+-- 
+1.7.9.5
+
diff --git a/target/linux/generic/patches-4.3/192-USB-qcserial-Add-support-for-Quectel-EC20-Mini-PCIe-.patch b/target/linux/generic/patches-4.3/192-USB-qcserial-Add-support-for-Quectel-EC20-Mini-PCIe-.patch
new file mode 100644
index 0000000000..f56941cbb8
--- /dev/null
+++ b/target/linux/generic/patches-4.3/192-USB-qcserial-Add-support-for-Quectel-EC20-Mini-PCIe-.patch
@@ -0,0 +1,119 @@
+From 128524b9db3e4f4245226852bee771bd03db75be Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Petr=20=C5=A0tetiar?= <ynezz@true.cz>
+Date: Tue, 3 Nov 2015 11:01:42 +0100
+Subject: [PATCH 1/2] USB: qcserial: Add support for Quectel EC20 Mini PCIe
+ module
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+It seems like this device has same vendor and product IDs as G2K
+devices, but it has different number of interfaces(4 vs 5) and also
+different interface layout which makes it currently unusable:
+
+	usbcore: registered new interface driver qcserial
+	usbserial: USB Serial support registered for Qualcomm USB modem
+	usb 2-1.2: unknown number of interfaces: 5
+
+lsusb output:
+
+	Bus 002 Device 003: ID 05c6:9215 Qualcomm, Inc. Acer Gobi 2000 Wireless
+	Device Descriptor:
+	  bLength                18
+	  bDescriptorType         1
+	  bcdUSB               2.00
+	  bDeviceClass            0 (Defined at Interface level)
+	  bDeviceSubClass         0
+	  bDeviceProtocol         0
+	  bMaxPacketSize0        64
+	  idVendor           0x05c6 Qualcomm, Inc.
+	  idProduct          0x9215 Acer Gobi 2000 Wireless Modem
+	  bcdDevice            2.32
+	  iManufacturer           1 Quectel
+	  iProduct                2 Quectel LTE Module
+	  iSerial                 0
+	  bNumConfigurations      1
+	  Configuration Descriptor:
+	    bLength                 9
+	    bDescriptorType         2
+	    wTotalLength          209
+	    bNumInterfaces          5
+	    bConfigurationValue     1
+	    iConfiguration          0
+	    bmAttributes         0xa0
+	      (Bus Powered)
+	      Remote Wakeup
+	    MaxPower              500mA
+
+Signed-off-by: Petr Štetiar <ynezz@true.cz>
+---
+ drivers/usb/serial/qcserial.c |   39 +++++++++++++++++++++++++++++++++++++++
+ 1 file changed, 39 insertions(+)
+
+diff --git a/drivers/usb/serial/qcserial.c b/drivers/usb/serial/qcserial.c
+index ebcec8c..d462132 100644
+--- a/drivers/usb/serial/qcserial.c
++++ b/drivers/usb/serial/qcserial.c
+@@ -22,6 +22,8 @@
+ #define DRIVER_AUTHOR "Qualcomm Inc"
+ #define DRIVER_DESC "Qualcomm USB Serial driver"
+ 
++#define QUECTEL_EC20_IDPRODUCT 0x9215
++
+ /* standard device layouts supported by this driver */
+ enum qcserial_layouts {
+ 	QCSERIAL_G2K = 0,	/* Gobi 2000 */
+@@ -167,6 +169,38 @@ static const struct usb_device_id id_table[] = {
+ };
+ MODULE_DEVICE_TABLE(usb, id_table);
+ 
++static int handle_quectel_ec20(struct device *dev, int ifnum)
++{
++	int altsetting = 0;
++
++	/*
++	 * Quectel EC20 Mini PCIe LTE module layout:
++	 * 0: DM/DIAG (use libqcdm from ModemManager for communication)
++	 * 1: NMEA
++	 * 2: AT-capable modem port
++	 * 3: Modem interface
++	 * 4: NDIS
++	 */
++	switch (ifnum) {
++	case 0:
++		dev_dbg(dev, "Quectel EC20 DM/DIAG interface found\n");
++		break;
++	case 1:
++		dev_dbg(dev, "Quectel EC20 NMEA GPS interface found\n");
++		break;
++	case 2:
++	case 3:
++		dev_dbg(dev, "Quectel EC20 Modem port found\n");
++		break;
++	case 4:
++		/* Don't claim the QMI/net interface */
++		altsetting = -1;
++		break;
++	}
++
++	return altsetting;
++}
++
+ static int qcprobe(struct usb_serial *serial, const struct usb_device_id *id)
+ {
+ 	struct usb_host_interface *intf = serial->interface->cur_altsetting;
+@@ -235,6 +269,11 @@ static int qcprobe(struct usb_serial *serial, const struct usb_device_id *id)
+ 			altsetting = -1;
+ 		break;
+ 	case QCSERIAL_G2K:
++		if (nintf == 5 && id->idProduct == QUECTEL_EC20_IDPRODUCT) {
++			altsetting = handle_quectel_ec20(dev, ifnum);
++			goto done;
++		}
++
+ 		/*
+ 		 * Gobi 2K+ USB layout:
+ 		 * 0: QMI/net
+-- 
+1.7.9.5
+
diff --git a/target/linux/generic/patches-4.3/193-USB-qmi_wwan-Add-quirk-for-Quectel-EC20-Mini-PCIe-mo.patch b/target/linux/generic/patches-4.3/193-USB-qmi_wwan-Add-quirk-for-Quectel-EC20-Mini-PCIe-mo.patch
new file mode 100644
index 0000000000..3b08571361
--- /dev/null
+++ b/target/linux/generic/patches-4.3/193-USB-qmi_wwan-Add-quirk-for-Quectel-EC20-Mini-PCIe-mo.patch
@@ -0,0 +1,101 @@
+From fe29727caa7fe434fcb3166df2a62672bc516b54 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Petr=20=C5=A0tetiar?= <ynezz@true.cz>
+Date: Wed, 4 Nov 2015 16:23:37 +0100
+Subject: [PATCH 2/2] USB: qmi_wwan: Add quirk for Quectel EC20 Mini PCIe
+ module
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+This device has same vendor and product IDs as G2K devices, but it has
+different number of interfaces(4 vs 5) and also different interface
+layout where EC20 has QMI on interface 4 instead of 0.
+
+lsusb output:
+
+	Bus 002 Device 003: ID 05c6:9215 Qualcomm, Inc. Acer Gobi 2000
+	Device Descriptor:
+	  bLength                18
+	  bDescriptorType         1
+	  bcdUSB               2.00
+	  bDeviceClass            0 (Defined at Interface level)
+	  bDeviceSubClass         0
+	  bDeviceProtocol         0
+	  bMaxPacketSize0        64
+	  idVendor           0x05c6 Qualcomm, Inc.
+	  idProduct          0x9215 Acer Gobi 2000 Wireless Modem
+	  bcdDevice            2.32
+	  iManufacturer           1 Quectel
+	  iProduct                2 Quectel LTE Module
+	  iSerial                 0
+	  bNumConfigurations      1
+	  Configuration Descriptor:
+	    bLength                 9
+	    bDescriptorType         2
+	    wTotalLength          209
+	    bNumInterfaces          5
+	    bConfigurationValue     1
+	    iConfiguration          0
+	    bmAttributes         0xa0
+	      (Bus Powered)
+	      Remote Wakeup
+	    MaxPower              500mA
+
+Signed-off-by: Petr Štetiar <ynezz@true.cz>
+---
+ drivers/net/usb/qmi_wwan.c |   21 +++++++++++++++++++++
+ 1 file changed, 21 insertions(+)
+
+diff --git a/drivers/net/usb/qmi_wwan.c b/drivers/net/usb/qmi_wwan.c
+index 2a7c1be..b81a32c 100644
+--- a/drivers/net/usb/qmi_wwan.c
++++ b/drivers/net/usb/qmi_wwan.c
+@@ -822,6 +822,7 @@ static const struct usb_device_id products[] = {
+ 	{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) */
+@@ -853,10 +854,24 @@ static const struct usb_device_id products[] = {
+ };
+ 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
+@@ -868,6 +883,12 @@ static int qmi_wwan_probe(struct usb_interface *intf,
+ 		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);
+ }
+ 
+-- 
+1.7.9.5
+