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What is USB gadget mode?
Makes a Linux system look like a USB device to a host computer. It can provide many kind of USB devices: a serial connection, ethernet over USB, keyboard emulation, etc.
What is Gadgetfs?
USB Raw Gadget is a gadget driver that gives userspace low-level control over the gadget’s communication process. Like any other gadget driver, Raw Gadget implements USB devices via the USB gadget API.
What is UDC Linux?
A USB Linux Gadget is a device which has a UDC (USB Device Controller) and can be connected to a USB Host to extend it with additional functions like a serial port or a mass storage capability. Linux provides a number of functions for gadgets to use.
What is pi zero OTG?
This Pi Zero USB Adaptor converts the Zero’s Micro USB B Port to a full sized USB A port so you can plug in your mouse, keyboard or any other required peripherals! It’s an OTG (on-the-go) host cable, which means your Zero can act as a host (master) or client (slave) device.
What is OTG Raspberry Pi?
The Raspberry Pi Zero and Pi Zero W feature a USB OTG port, allowing users to configure the device as (amongst other things) an Ethernet device. In this mode, it is possible to control the Pi Zero’s GPIO pins over USB from another computer using the remote GPIO feature.
What is FunctionFS?
From user space point of view it is a file system which when mounted provides an “ep0” file. User space driver need to write descriptors and strings to that file. The idea is that each FunctionFS instance is identified by the device name used when mounting.
What is Configfs in Linux?
Configfs is for creating, managing and destroying kernel objects from user-space, and sysfs for viewing and manipulating objects from user-space which are created and destroyed by kernel space. It is typically mounted at /sys/kernel/config (or more rarely at /config ).
What is Linux USB gadget?
Introduction. The term “USB Gadget” will usually refer to the Linux USB gadget framework. This is relevant for those sunxi devices that offer a “On-The-Go” (OTG) port, allowing this USB connector to act in a “dual role” mode. Composite gadgets: Multifunction composite, Ethernet & ACM, ACM & mass storage, Nokia …
Where can I find the vendor ID for USB?
You can find a list of vendor ID at the usb.org website itself, it is under the tools section: http://www.usb.org/developers/tools/comp_dumpthis list has the companies and VID in Decimal numbers so you might need to convert it to a Hex number to get the correct one. Direct link from above is dead.
What is the struct of a USB Gadget driver?
Such gadget-side interface drivers should eventually be combined, to implement composite devices. Gadget drivers declare themselves through a struct usb_gadget_driver, which is responsible for most parts of enumeration for a struct usb_gadget.
Why are USB Gadget drivers written in Linux?
Gadget drivers can be written so they’re easy to port to new hardware. Flexible enough to expose more complex USB device capabilities such as multiple configurations, multiple interfaces, composite devices, and alternate interface settings. USB “On-The-Go” (OTG) support, in conjunction with updates to the Linux-USB host side.
Is the device driver the same as the gadget driver?
In USB protocol interactions, the device driver is the master (or “client driver”) and the gadget driver is the slave (or “function driver”). The gadget API resembles the host side Linux-USB API in that both use queues of request objects to package I/O buffers, and those requests may be submitted or canceled.