移远EC20、EC25内核驱动修改。内核版本为3.2.0。
一、设备信息。
Interface Information：
EC20VID: 0x05c6 PID: 0x9215USB SerialttyUSB0 -> DMttyUSB1 -> NMEAttyUSB2 -> ATttyUSB3 -> ModemttyUSB4 -> NDISEC25VID: 0x2c7c PID: 0x0125
二、修改文件。
1、Add VID and PID。
文件：kernel/drivers/usb/serial/option.c。
static const struct usb_device_id option_ids[] = {...{ USB_DEVICE(QUALCOMM_VENDOR_ID, 0x6000)}, /* ZTE AC8700 */{ USB_DEVICE(QUALCOMM_VENDOR_ID, 0x6613)}, /* Onda H600/ZTE MF330 */{ USB_DEVICE(QUALCOMM_VENDOR_ID, 0x9000)}, /* SIMCom SIM5218 */#if 1 //Added by Quectel{ USB_DEVICE(0x05C6, 0x9090) }, /* Quectel UC15 */{ USB_DEVICE(0x05C6, 0x9003) }, /* Quectel UC20 */{ USB_DEVICE(0x2C7C, 0x0125) }, /* Quectel EC25/EC20 R2.0 */{ USB_DEVICE(0x2C7C, 0x0121) }, /* Quectel EC21 */{ USB_DEVICE(0x05C6, 0x9215) }, /* Quectel EC20 */{ USB_DEVICE(0x2C7C, 0x0191) }, /* Quectel EG91 */{ USB_DEVICE(0x2C7C, 0x0195) }, /* Quectel EG95 */{ USB_DEVICE(0x2C7C, 0x0306) }, /* Quectel EG06/EP06/EM06 */{ USB_DEVICE(0x2C7C, 0x0296) }, /* Quectel BG96 */#endif{ USB_DEVICE(CMOTECH_VENDOR_ID, CMOTECH_PRODUCT_6280) }, /* BP3-USB & BP3-EXT HSDPA */{ USB_DEVICE(CMOTECH_VENDOR_ID, CMOTECH_PRODUCT_6008) },{ USB_DEVICE(TELIT_VENDOR_ID, TELIT_PRODUCT_UC864E) },...
文件：kernel/drivers/usb/serial/qcserial.c。
static const struct usb_device_id id_table[] = {...{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, 0x9264)},/* Asus Gobi 2000 QDL device (VR305) */...
文件：kernel/drivers/net/usb/qmi_wwan.c。（无此文件）
{QMI_GOBI_DEVICE(0x05c6, 0x9215)}, /* Acer Gobi 2000 Modem device (VP413) */
2、Add the Zero Packet Mechanism。
文件：kernel/drivers/usb/serial/usb_wwan.c。For Linux Kernel Version newer than 2.6.34：
/* Helper functions used by usb_wwan_setup_urbs */static struct urb *usb_wwan_setup_urb(struct usb_serial *serial, int endpoint,int dir, void *ctx, char *buf, int len,void (*callback) (struct urb *)){.../* 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 Packetif (dir == USB_DIR_OUT) {struct usb_device_descriptor *desc = &serial->dev->descriptor;if (desc->idVendor == cpu_to_le16(0x05C6) && desc->idProduct == cpu_to_le16(0x9090))urb->transfer_flags |= URB_ZERO_PACKET;if (desc->idVendor == cpu_to_le16(0x05C6) && desc->idProduct == cpu_to_le16(0x9003))urb->transfer_flags |= URB_ZERO_PACKET;if (desc->idVendor == cpu_to_le16(0x05C6) && desc->idProduct == cpu_to_le16(0x9215))urb->transfer_flags |= URB_ZERO_PACKET;if (desc->idVendor == cpu_to_le16(0x2C7C))urb->transfer_flags |= URB_ZERO_PACKET;}#endifreturn urb;}...
文件：kernel/drivers/usb/serial/option.c。For Linux Kernel Version older than 2.6.35：
/* Helper functions used by option_setup_urbs */static struct urb *option_setup_urb(struct usb_serial *serial, int endpoint,int dir, void *ctx, char *buf, int len,void (*callback)(struct urb *)){……usb_fill_bulk_urb(urb, serial->dev,usb_sndbulkpipe(serial->dev, endpoint) | dir,buf, len, callback, ctx);#if 1 //Added by Quectel for Zero Packetif (dir == USB_DIR_OUT) {struct usb_device_descriptor *desc = &serial->dev->descriptor;if (desc->idVendor == cpu_to_le16(0x05C6) && desc->idProduct == cpu_to_le16(0x9090))urb->transfer_flags |= URB_ZERO_PACKET;if (desc->idVendor == cpu_to_le16(0x05C6) && desc->idProduct == cpu_to_le16(0x9003))urb->transfer_flags |= URB_ZERO_PACKET;if (desc->idVendor == cpu_to_le16(0x05C6) && desc->idProduct == cpu_to_le16(0x9215))urb->transfer_flags |= URB_ZERO_PACKET;if (desc->idVendor == cpu_to_le16(0x2C7C))urb->transfer_flags |= URB_ZERO_PACKET;#endifreturn urb;}
3、Add Reset Resume。
文件：kernel/drivers/usb/serial/option.c。For Linux Kernel Version newer than 3.4：
static struct usb_serial_driver option_1port_device = {……#ifdef CONFIG_PM.suspend = usb_wwan_suspend,.resume = usb_wwan_resume,#if 1 //Added by Quectel.reset_resume = usb_wwan_resume,#endif#endif};
文件：kernel/drivers/usb/serial/ usb-serial.c。For Linux Kernel Version older than 3.5：
/* Driver structure we register with the USB core */static struct usb_driver usb_serial_driver = {.name ="usbserial",.probe =usb_serial_probe,.disconnect =usb_serial_disconnect,.suspend =usb_serial_suspend,.resume =usb_serial_resume,#if 1 //Added by Quectel.reset_resume = usb_serial_resume,#endif.no_dynamic_id = 1,.supports_autosuspend =1,};
4、Enlarge Bulk out URBs。
文件：kernel/drivers/usb/serial/option.c。
原：/* per port private data */#define N_IN_URB 4#define N_OUT_URB 4#define IN_BUFLEN 4096#define OUT_BUFLEN 4096改：/* per port private data */#define N_IN_URB 4#define N_OUT_URB 4 //Quectel 1#define IN_BUFLEN 4096#define OUT_BUFLEN 4096 //Quectel 128
5、Use GobiNet or QMI WWAN。（无此文件）
文件：kernel/drivers/usb/serial/option.c。For Linux Kernel Version newer than 2.6.30：
static int option_probe(struct usb_serial *serial,const struct usb_device_id *id){...#if 1 //Added by Quectel//Quectel UC20's interface 4 can be used as USB Network deviceif (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 deviceif (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&EC20 R2.0&EG91&EG95&EG06&EP06&EM06&BG96's interface 4 can be used as USB Network deviceif (serial->dev->descriptor.idVendor == cpu_to_le16(0x2C7C) \&& serial->interface->cur_altsetting->desc.bInterfaceNumber >= 4)return -ENODEV;#endif/* Store device id so we can use it during attach. */usb_set_serial_data(serial, (void *)id);return 0;}...
文件：kernel/drivers/usb/serial/option.c。For Linux Kernel Version older than 2.6.31：
static int option_startup(struct usb_serial *serial){...dbg("%s", __func__);#if 1 //Added by Quectel//Quectel UC20's interface 4 can be used as USB Network deviceif (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 deviceif (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&EC20 R2.0&EG91&EG95&EG06&EP06&EM06&BG96's interface 4 can beused as USB Network deviceif (serial->dev->descriptor.idVendor == cpu_to_le16(0x2C7C)&& serial->interface->cur_altsetting->desc.bInterfaceNumber >= 4)return -ENODEV;#endif...
三、内核配置，Modify Kernel Configuration。
1、Enable CONFIG_USB_SERIAL_OPTION。
[*] Device Drivers-->[*] USB Support-->[*] USB Serial Converter support[*] USB driver for GSM and CDMA modems
Configure USB Serial in Kernel：
2、Enable CONFIG_USB_USBNET。
[*] Device Drivers-->-*- Network device support-->USB Network Adapters<*> Multi-purpose USB Networking Framework
3、WWAN driver。
[*] Device Drivers-->-*- Network device support-->USB Network Adapters<*> USB-to-WWAN Driver for Sierra Wireless modems
4、Configure Kernel to Support PPP。
[*] Device Drivers-->[*] Network device support[*] PPP (point-to-point protocol) support
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