树莓派4b移植4G USB驱动Quectel EC200T以及ppp拨号_树莓派 ubuntu ec200

1. 准备编译环境

1.1 下载linux内核，准备编译环境，请参看“RaspberryPi4B 树莓派4B Linux5.4.y 内核编译”

1.2 修改usb串口驱动， drivers/usb/serial/option.c

static const struct usb_device_id option_ids[] = {
#if 1 //Added by Quectel
	{ USB_DEVICE(QUALCOMM_VENDOR_ID, 0x9215) }, /* Quectel EC20 */
	{ USB_DEVICE(QUECTEL_VENDOR_ID, 0x6026) }, /* Quectel EC200 */
	{ USB_DEVICE(QUECTEL_VENDOR_ID, 0x6120) }, /* Quectel UC200 */
	{ USB_DEVICE(QUECTEL_VENDOR_ID, 0x6000) }, /* Quectel EC200/UC200 */
#endif
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1.3 增加休眠后唤醒接口

static struct usb_serial_driver option_1port_device = {
	.driver = {
		.owner =	THIS_MODULE,
		.name =		"option1",
	},
	.description       = "GSM modem (1-port)",
	
	...
	
#ifdef CONFIG_PM
 	.suspend           = usb_wwan_suspend,
 	.resume            = usb_wwan_resume,
#if 1 //add by Quectel
	.reset_resume   = usb_wwan_resume,
#endif
#endif
};
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1.4 如果要使用 GobiNet or QMI WWAN，需要阻止第四个接口注册为串口

static int option_probe(struct usb_serial *serial,
			const struct usb_device_id *id)
{
	struct usb_interface_descriptor *iface_desc =
				&serial->interface->cur_altsetting->desc;
	unsigned long device_flags = id->driver_info;

	#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)
		&
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