17-04-2021

Drivers Linx USB Devices

Drivers Included in Linux Kernel Key Features. Out-of-the-box usage, suitable for most cases; Part of the Linux mainline kernel, classic CAN since 3.2 (peakpci), CAN FD since 4.0 (peakusb) CAN channels are handled as network devices (netdev) Check: Are CAN drivers part of your Linux environment? Open a terminal and type. It is a utility for displaying information about USB buses in the system and the devices connected to them under Linux kernel. Lsusb – list USB devices To make use of all the features of this program, you need to have a Linux kernel which supports the /proc/bus/usb interface (e.g., Linux kernel 2.3.15 or newer). Welcome to Linx Support. For product support, downloads and technical information for the Linx range of tablets and notebooks, please select your device from the choices below.

The Linux USB gadget sub-system supports USB device functionality, including USB networking.

10Debugging and resolving common errors

Welcome to Linx Support. For product support, downloads and technical information for the Linx range of tablets and notebooks, please select your device from the choices below.

Configure hardware for USB OTG or USB device support

Depending on your hardware, you can use either USB OTG or USB device to enable support for USB networking.

Linux Usb Fedora

DM365 - How to configure DM365 for USB host, device and OTG support

Build USB Ethernet network gadget driver

The USB Ethernet network gadget driver caused the device to appear to be a USB network dongle when connected to a host computer. Generally it is best to build USB gadget drivers as modules instead of building them into the kernel so you can unload one and load another.

If you want the target to mount a host PC directory using NFS, then also enable NFS mount support in busybox:

Build the SDK and install the new images to the target hardware.

Load USB Ethernet network gadget driver

After booting the target hardware to a shell prompt, run:

and you should see output similar to:

You can then verify the usb0 network interface exists:

with output similar to:

Connect device to host PC

Before connecting the target device to the host PC, watch the syslog, by running the following command on the host PC:

Connect the USB cable between the target device and the host PC. The messages file on the host PC should indicate the new USB device was detected.

On the host you can verify the new usb0 interface exists by running:

with the output being similar to:

When you connect the cable, in the target device console, you should see:

Assigning IP addresses

For this simple example, fixed IP addresses are assigned to the both the host PC USB network interface and the target device USB network interface.

On the host

with an entry from the route output that looks like

On the target device

with the route showing the default gateway is using usb0

Verifying network connectivity

On the target device, ping the host PC:

On the host PC, verify the number of packet sent and received is not zero

Look at the values of RX packets: and TX packets:.

Bridging host PC to allow device to reach the Internet

If your host PC is connected to the Internet (through WiFi or Ethernet), then you can allow the target device to share the host PC's Internet connection. The following shows how to enable, test, and disable. It only works if your host PC doesn't have a firewall enable. There is a lot of information on how the Internet giving more detailed explanation.

On the host PC:

And then for reasons I don't fully undestand, I had to configure usb0 on the host again:

On the target device:

To disable forwarding network packets on your host PC:

Configuring a DNS name server

If you need to resolve DNS names, you can configure your target hardware to use Google's DNS server via:

and you can test that names get resolved by pinging some computer on the Internet:

Mounting NFS file system

If you have already enabled NFS share of your development directory target file system, $DEVDIR/fs/fs, then you can easily mount the file system on the target. This is different than a root NFS mount. With a root NFS mount, networking has to be available when the kernel is booting. With a normal (non root file system) NFS mount, you are simply mounting a shared directory somewhere in the target device's file system.

First verify you build the target file system kernel with NFS enabled:

with expected output

Mount host file system on target:

Debugging and resolving common errors

Wireshark

Wireshark is your friend. Run wireshark on your host PC monitoring the usb0 interface and you don't need any packet filters. If something isn't working, you will see the last packet that was sent and not responded to. That will give you a big hint as to where to start looking for the problem.

NFS mount failed reason given by server: Permission denied

If you see a message like

and you know you have root NFS working, the cause is due to a different sub-LAN address being used. On your host PC, you need to make sure the 10.0.1.* sub-LAN is exported. Run the following commands to export you home directory to all computers on this sub-LAN:

Retrieved from 'http://developer.ridgerun.com/wiki/index.php?title=How_to_use_USB_device_networking&oldid=17183'

As with other bus-based subsystems in Oracle Linux, a USB device driver registers its driver object with the USB subsystem. It can then use vendor and device identifiers to determine if the USB hardware is present.

The implementation of USB device drivers is likely to differ in many respects between Linux and UNIX operating systems, with most differences arising from the functions that the driver uses to handle USB requests, the structures that are used to represent USB driver methods and to define the properties of USB devices, and the kernel interface routines for communicating with the USB infrastructure.

The usb_driver and usb_device_id structures, defined in <linux/usb.h>, describe the USB driver and the USB device types that it supports. The usb_driver defines a number of methods that the USB core can use with the device:

A driver should define probe() and disconnect() methods to support initialization and cleanup when a device is plugged in or removed from the system. The driver should call usb_register() and usb_deregister() to register the driver with the USB core and to unregister it.

The urb structure defines a USB request block that the kernel uses to send data to a USB device. To send data to a device, the driver's write() method should use usb_alloc_urb() to allocate an urb, usb_buffer_alloc() to allocate a buffer for the data, copy_from_user() to write the data into the buffer, usb_fill_bulk_urb() to fill in the details of the urb, and usb_submit_urb() to submit the urb to the USB core. The USB core invokes the driver's callback() method to report the status of the transaction. The driver should use usb_buffer_free() to free the allocated buffer.

To read data from a device, the driver's read() method can use usb_bulk_msg().