一:usb转串口
usb-serial-option,USB转串口驱动，生产/dev/ttyUSB0-2,分别是DM，AT，PPP
需要使能内核选项如下:
CONFIG_USB_SERIAL=y
CONFIG_USB_SERIAL_WWAN=y
CONFIG_USB_SERIAL_OPTION=y
二:usb网卡驱动
USB网卡驱动，模块可通过AT配置成RNDIS或者ecm,默认是ecm。
需要使能内核选项
USB_USBNET=y
USB_NET_CDCETHER=y #用ECM 使能此项
USB_NET_RNDIS_HOST=y #用RNDIS 使能此项
三:源码修改
- 增加usb vid和pid
增加vid和pid,设备连接，使用lsusb命令查看设备的vid和pid，如下图所示：
vid:3763
pid:3c93
文件修改:linux-3.10/drivers/usb/serial/option.c
static const struct usb_device_id option_ids[] = {
#if 1 //Added by Quectel
{ USB_DEVICE(0x3763, 0x3c93) }, /* Quectel EC200A-CN 内置GPS */
{ USB_DEVICE(0x3c93, 0xffff) }, /* Quectel EC200A-CN 外置GPS*/
#endif
文件修改:linux-3.10/drivers/usb/serial/option.c
1790 #if 1 //Added by Quectel
1791 static void cfmakeraw(struct ktermios *t)
1792 {
1793 t->c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON);
1794 t->c_oflag &= ~OPOST;
1795 t->c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
1796 t->c_cflag &= ~(CSIZE|PARENB);
1797 t->c_cflag |= CS8;
1798 t->c_cc[VMIN] = 1;
1799 t->c_cc[VTIME] = 0;
1800 }
1801
1802 static void option_init_termios(struct tty_struct *tty)
1803 {
1804 cfmakeraw(&tty->termios);
1805 }
1806 #endif
文件修改:linux-3.10/drivers/usb/serial/option.c:option_1port_device
1813 static struct usb_serial_driver option_1port_device = {
1814 .driver = {
1815 .owner = THIS_MODULE,
1816 .name = "option1",
1817 },
1818 .description = "GSM modem (1-port)",
1819 .id_table = option_ids,
1820 .num_ports = 1,
1821 .probe = option_probe,
1822 .open = usb_wwan_open,
1823 .close = usb_wwan_close,
1824 .dtr_rts = usb_wwan_dtr_rts,
1825 .write = usb_wwan_write,
1826 .write_room = usb_wwan_write_room,
1827 .chars_in_buffer = usb_wwan_chars_in_buffer,
1828 .set_termios = usb_wwan_set_termios,
1829 .tiocmget = usb_wwan_tiocmget,
1830 .tiocmset = usb_wwan_tiocmset,
1831 .ioctl = usb_wwan_ioctl,
1832 .attach = option_attach,
1833 .release = option_release,
1834 .port_probe = usb_wwan_port_probe,
1835 .port_remove = usb_wwan_port_remove,
1836 .read_int_callback = option_instat_callback,
1837 #ifdef CONFIG_PM
1838 .suspend = usb_wwan_suspend,
1839 .resume = usb_wwan_resume,
1840 #if 1 //Added by Quectel
1841 .reset_resume = usb_wwan_resume,
1842 #endif
1843 #endif
1844 };
文件修改:linux-3.10/drivers/usb/serial/option.c:option_probe
if (serial->dev->descriptor.idVendor == cpu_to_le16(0x3c93))
{
__u16 idProduct = le16_to_cpu(serial->dev->descriptor.idProduct);
struct usb_interface_descriptor *intf = &serial->interface->cur_altsetting->desc;
if (intf->bInterfaceClass != 0xFF || intf->bInterfaceSubClass == 0x42)
{
//ECM, RNDIS, NCM, MBIM, ACM, UAC, ADB
return -ENODEV;
}
if ((idProduct&0xF000) == 0x0000)
{
//MDM interface 4 is QMI
if (intf->bInterfaceNumber == 4 &&
intf->bNumEndpoints == 3 &&
intf->bInterfaceSubClass == 0xFF &&
intf->bInterfaceProtocol == 0xFF)
return -ENODEV;
}
}
if (serial->dev->descriptor.idVendor == cpu_to_le16(0x3763))
{
__u16 idProduct = le16_to_cpu(serial->dev->descriptor.idProduct);
struct usb_interface_descriptor *intf = &serial->interface->cur_altsetting->desc;
if (intf->bInterfaceClass != 0xFF || intf->bInterfaceSubClass == 0x42)
{
//ECM, RNDIS, NCM, MBIM, ACM, UAC, ADB
return -ENODEV;
}
if ((idProduct&0xF000) == 0x0000)
{
//MDM interface 4 is QMI
if (intf->bInterfaceNumber == 4 &&
intf->bNumEndpoints == 3 &&
intf->bInterfaceSubClass == 0xFF &&
intf->bInterfaceProtocol == 0xFF)
return -ENODEV;
}
}
- linux-3.10/drivers/usb/serial/usb_wwan.c:usb_wwan_setup_urb
在usb_wwan_setup_urb函数中添加如下内容
//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(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;
if (desc->idVendor == cpu_to_le16(0x3c93))
urb->transfer_flags |= URB_ZERO_PACKET;
if (desc->idVendor == cpu_to_le16(0x3763))
urb->transfer_flags |= URB_ZERO_PACKET;
}
四:测试
- 查看usb网卡是否生成
ifconfig -a
文章来源：https://www.toymoban.com/news/detail-461303.html
- 测试方法一
busybox microcom /dev/ttyUSB2
3. 测试方法二文章来源地址https://www.toymoban.com/news/detail-461303.html
cat /dev/ttyUSB2 &
echo AT > /dev/ttyUSB2
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