OpenWrt21 EC20 R2.0驱动添加

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已于 2022-04-01 16:07:06 修改 · 6.8k 阅读

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#物联网 #iot

于 2022-04-01 15:21:13 首次发布

本文档详细介绍了如何在OpenWrt21内核版本5.4上针对Quectel EC20R2.0模块进行内核修改，包括USB串口驱动、添加零包处理、添加ResetResume功能、使用GobiNet或QMI WWAN，并提供了相应的菜单config配置选择。拨号方法包括quectel-CM和ppp方式，最后展示了成功拨号后的设备信息。

1、OpenWrt21内核版本为5.4，EC20R2.0的VID、PID为0x2C7C, 0x0125，可以使用qmi拨号或者ppp拨号

2、内核修改

1、修改USB串口驱动

File : [KERNEL]/drivers/usb/serial/option.c

static const struct usb_device_id option_ids[] = {
#if 1 //Added by Quectel
	{ USB_DEVICE(0x05C6, 0x9090) }, /* Quectel UC15 */
	{ USB_DEVICE(0x05C6, 0x9003) }, /* Quectel UC20 */
	{ USB_DEVICE(0x05C6, 0x9215) }, /* Quectel EC20 */
	{ USB_DEVICE(0x2C7C, 0x0125) }, /* Quectel EC25/EC20 R2.0 */
	{ USB_DEVICE(0x2C7C, 0x0121) }, /* Quectel EC21 */
#endif

2.1、添加零包处理

File:[KERNEL]/drivers/usb/serial/usb_wwan.c

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 *))
{
……
#if 1 //Added by Quectelfor Zero Packet
	if (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;
 
}
#endif
	return urb;
}

2.2、Add Reset Resume

File: [KERNEL]/drivers/usb/serial/option.c

static struct usb_serial_driveroption_1port_device = {
……

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