Quectel EC200N-CN驱动移植记录

{ USB_DEVICE(0x2C7C, 0x6002) }, /* Quectel EC200N-CN */

2)add zero packet mechanism

kernel_dir/drivers/usb/serial/usb_wwan.c

if (dir == USB_DIR_OUT) {
struct usb_device_descriptor *desc = &serial->dev->descriptor;
if (desc->idVendor == cpu_to_le16(0x2C7C))
urb->transfer_flags |= URB_ZERO_PACKET;
}

3） use ecm or rndis

kernel_dir/drivers/usb/serial/option.c

static int option_probe(struct usb_serial *serial, const struct usb_device_id *id) {
struct usb_wwan_intf_private *data;
……
#if 1 //Added by Quectel