This is a doucmentation source for installing drivers for Quectel EG25-G wireless modem. This has been tested on Linux kernel version 6.0.7, but should work on most others.
Steps 1-3 may be able to be done with a kernel module. Will test
For senior design just use this command to get the newest kernel for the le potato boards
wget https://github.com/libre-computer-project/libretech-linux/archive/refs/heads/v6.0/libretech-master.zip
unzip libretech-master.zipIn the file [KERNEL]/drivers/usb/serial/usb_wwan.c add the code between the #if in the method usb_wwan_setup_urb
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 *)) {
……
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) {
struct usb_device_descriptor *desc = &serial->dev->descriptor;
if (desc->idVendor == cpu_to_le16(0x2C7C))
urb->transfer_flags |= URB_ZERO_PACKET;
}
#endif
return urb;
}In the file [KERNEL]/drivers/usb/serial/option.c add the following code between the #if in the struct usb_serial_driver
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
};and inside the method option_probe
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
//Quectel modules’s interface 4 can be used as USB network device
if (serial->dev->descriptor.idVendor == cpu_to_le16(0x2C7C)) {
//some interfaces can be used as USB Network device (ecm, rndis, mbim)
if (serial->interface->cur_altsetting->desc.bInterfaceClass != 0xFF) {
return -ENODEV;
}
//interface 4 can be used as USB Network device (qmi)
else if (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;
}wget https://github.com/mckouba/EG25-G_Setup/blob/main/scripts/install_driver.sh
sudo chmod +x install_driver.sh
sudo ./install_driver.shOriginal source for quecetel-CM: https://github.com/sixfab/Sixfab_QMI_Installer/raw/main/src/Quectel_QConnectManager_Linux_V1.6.1.zip
Original source for EC25 driver: https://www.quectel.com/ProductDownload/EC25.html
Changes Made from original:
EG25-Driver/05_Driver/Gobinet/GobiUSBNet.c:
Line 850-860:
Original:
#if 1 //def DATA_MODE_RP
/* make MAC addr easily distinguishable from an IP header */
if ((pDev->net->dev_addr[0] & 0xd0) == 0x40) {
/*clear this bit wil make usbnet apdater named as usbX(instead if ethX)*/
pDev->net->dev_addr[0] |= 0x02; /* set local assignment bit */
pDev->net->dev_addr[0] &= 0xbf; /* clear "IP" bit */
}
#endifModified:
#if 1 //def DATA_MODE_RP
/* make MAC addr easily distinguishable from an IP header */
if ((pDev->net->dev_addr[0] & 0xd0) == 0x40) {
u8 addr = pDev->net->dev_addr[0];
/*clear this bit wil make usbnet apdater named as usbX(instead if ethX)*/
addr |= 0x02; /* set local assignment bit */
addr &= 0xbf; /* clear "IP" bit */
dev_addr_mod(pDev->net, 0, &addr, 1);
}
#endifEG25-Driver/05_Driver/QMI_WWAN/qmi_wwan_q.c
Original:
if (possibly_iphdr(dev->net->dev_addr)) {
dev->net->dev_addr[0] |= 0x02; /* set local assignment bit */
dev->net->dev_addr[0] &= 0xbf; /* clear "IP" bit */
}Modified:
if (possibly_iphdr(dev->net->dev_addr)) {
u8 addr = dev->net->dev_addr[0];
addr |= 0x02; /* set local assignment bit */
addr &= 0xbf; /* clear "IP" bit */
dev_addr_mod(dev->net, 0, &addr, 1);
}This needed to be changed because in linux kernel version 5.16 changed netdev->dev_addr such that it cannot be written to directly anymore. Due to this these files needed to be changed as they would not compile.
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