一、EC200T驱动移植

1、添加usb-serial-option usb串口驱动

1.1 修改drivers/usb/serial/option.c

staticconststructusb_device_idoption_ids[] = {

#if 1 //Added by Quectel

{ USB_DEVICE(0x2C7C, 0x0125) }, /* Quectel EC25/EC20 R2.0 */

{ USB_DEVICE(0x2C7C, 0x0121) }, /* Quectel EC21 */

{ USB_DEVICE(0x2C7C, 0x6026) }, /* Quectel EC200T */

#endif

staticintoption_probe(structusb_serial *serial,

conststructusb_device_id *id)

{

structusb_wwan_intf_private *data;

#if 1 //Added by Quectel

//Quectel EC25&EC21 's interface 4 can be used as USB Network device

if (serial->dev->descriptor.idVendor == cpu_to_le16(0x2C7C) && serial->dev->descriptor.idProduct != cpu_to_le16(0x6026)

&& serial->interface->cur_altsetting->desc.bInterfaceNumber>= 4)

return -ENODEV;

if (serial->dev->descriptor.idVendor == cpu_to_le16(0x2C7C) && serial->dev->descriptor.idProduct == cpu_to_le16(0x6026)

&& serial->interface->cur_altsetting->desc.bInterfaceNumber<= 1)

return -ENODEV;

#endif

1.2 添加drivers/usb/serial/usb_wwan.c

/* Fill URB using supplied data. */

usb_fill_bulk_urb(urb, serial->dev,

usb_sndbulkpipe(serial->dev, endpoint) | dir,

buf, len, callback, ctx);

#if 1 //Added by Quectel for Zero Packet

if (dir == USB_DIR_OUT) {

structusb_device_descriptor *desc = &serial->dev->descriptor;

if (desc->idVendor == cpu_to_le16(0x2C7C))

urb->transfer_flags |= URB_ZERO_PACKET;

}

#endif

2、测试驱动加载

2.1 驱动加载流程

4480.389072] usb 1-1: new high-speed USB device number 2 using ehci-pci

[ 4480.724881] usb 1-1: New USB device found, idVendor=2c7c, idProduct=6026

[ 4480.724891] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3

[ 4480.724945] usb 1-1: Product: Android

[ 4480.724950] usb 1-1: Manufacturer: Android

[ 4480.724953] usb 1-1: SerialNumber: 200806006809080000

[ 4480.880597] usbcore: registered new interface driver usbserial

[ 4480.882143] usbcore: registered new interface driver usbserial_generic

[ 4480.882258] usbserial: USB Serial support registered for generic

[ 4480.900108] usb_wwan: module verification failed: signature and/or required key missing - tainting kernel

[ 4480.904573] cdc_ether 1-1:1.0 eth1: register 'cdc_ether' at usb-0000:02:03.0-1, CDC Ethernet Device, ac:5f:92:e1:e1:7f

[ 4480.907953] usbcore: registered new interface driver cdc_ether

[ 4480.949296] usbcore: registered new interface driver option

[ 4480.949337] usbserial: USB Serial support registered for GSM modem (1-port)

[ 4480.949618] TEST:bInterfaceNumber is 2.

[ 4480.949634] option 1-1:1.2: GSM modem (1-port) converter detected

[ 4480.950765] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB0

[ 4480.950866] TEST:bInterfaceNumber is 3.

[ 4480.950876] option 1-1:1.3: GSM modem (1-port) converter detected

[ 4480.951768] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB1

[ 4480.951815] TEST:bInterfaceNumber is 4.

[ 4480.951821] option 1-1:1.4: GSM modem (1-port) converter detected

[ 4480.952507]usb 1-1: GSM modem (1-port) converter now attached to ttyUSB2

2.2 USB端口设备

/dev/ttyUSB1 is AT Port

/dev/ttyUSB2 is PPP port

3、USB网卡usbnet模式(默认rndis模式)

二、Linux/Android ppp拨号移植

1.Enable CONFIG_PPP_ASYNC CONFIG_PPP_SYNC_TTY CONFIG_PPP_DEFLATE

1.1 modified Makefile

1.2 modified Kconfig