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Gadget Serial 2.4 Software To Act

Many Linux systems will not be able to use it, since they only have PC-style USB Host (master) hardware in a PC, workstation, or server. The drivers implementing and using that API combine to make a useful driver framework for Linux systems that implement USB peripherals. Overview - The gadget serial driver is a Linux USB gadget driver.The API makes it easy for peripherals and other devices embedding GNU/Linux system software to act in the USB 'device' (slave) role. The gadget framework is available in 2.6 kernels, as well as 2.4.23 and later.

Plus, all of this is done in userspace thanks to GadgetFS. Sometimes it will be the only option there are Linux devices that rely on USB even for their power supplies.Micro- processor operated and supervised circuits guaranty highest reliability. Smart gadgets like PDAs, printers, cell phones, cash registers, and network routers often rely on this type of 'Device Controller' USB link as one of their basic connectivity options.

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The BitKeeper trees are no longer current, but the 'mm' patchsets or various other GIT trees may well have more current code than the current mainstream kernel.There may be other public trees with controller or gadget drivers too. Getting the CodeThe API and several supporting drivers are included in current 2.4 and 2.6 Linux kernels, available through kernel.org as tarballs, or from vendors supporting customized Linux distributions. Otherwise, a Net2280 PCI card lets you work on a standard PC, developing or debugging gadget drivers on computers you may already own. If youвЂ™re comfortable working with embedded Linux platforms, many ARM systems already have Linux support for their integrated USB controllers.

Some 2.4 vendor kernels already include some of that code, making 2.6 backports even easier. Most new development is based on 2.6 kernels differences relevant to 2.4 based development are minor, mostly limited to kernel configuration and the 2.6 kernelвЂ™s 'generic DMA' and 'driver model' infrastructure. 2.4.31) onto older 2.4 kernels. ItвЂ™s easy to backport current 2.4 gadget code (e.g. (2.4.27 is the first 2.4 kernel to bundle RNDIS support, and some other framework improvements.) At this writing, other than architecture- or board-specific setup, and the header files, all the gadget code is in the drivers/usb/gadget directory. Kernel trees that support specific System-on-Chip platforms often include a driver for that platformвЂ™s USB Peripheral Controller.The 'gadget' framework is available in 2.6 kernels, as well as 2.4.23 and later.

Different controller hardware will need different drivers, which may also need board-specific customization. Peripheral Controller Drivers implement the gadget API, and are the only layers that talk directly to hardware. From the bottom up, those layers are: The framework includes that API, some support software, and several drivers on each side of that API boundary, integrating well with other Linux subsystems.

Certain hardware facts need to affect the implementation of configuration management parts of ep0 logic. Gadget Drivers use that gadget API, and can often be written to be hardware-neutral. Other operating systems use other names for this component, perhaps labeling the API plus its libraries as a 'Platform Independent Layer' and its implementation as a 'Platform Specific Layer'. You can think of that device as being the virtual hardware to which the higher level drivers are written.

The USB host side needs such a layer to multiplex potentially hundreds of peripherals and drivers the peripheral side has no such requirement. The first is a layer that doesnвЂ™t exist: a 'mid layer', like the host-side 'usbcore' (which is what the USB specification calls 'USBD'). For example, the functions on a composite device might give hosts concurrent access to local audio, internet, and file servers.There are two other components worth mentioning. ( Again, this is directly analagous to what host side drivers do, though producer and consumer roles are probably reversed.) On most hardware, several different layers can be fed by the gadget driver at the same time. There will often be several such layers, perhaps including user mode components. These generate and consume the data that the gadget driver transfers to the host through the controller driver.

These arenвЂ™t a separate library or midlayer, theyвЂ™re just object files optionally linked with gadget drivers that want their functions. You can generate a current version of that yourself directly with commands like 'make pdfdocs', or use a pre-generated version (which may not be as up-to-date as what you make from current kernel sources).Recent versions of this API have improved and grown the collection of gadget driver library helper functions. (More information about OTG on Linux is available.) 'Layer cake' style architecture diagrams would put an OTG Controller Driver below the USB Peripheral and Host Controller Drivers, talking to both of those drivers as well as specialized hardware.The Linux 2.6 kernel tree includes kerneldoc for this API, including a structural overview as well as API reference. (The APIs are of course different the peripheral side is much lower overhead, and serves a 'slave' role not a 'master' one.) The second is an optional component that exists only in USB-OTG systems: an OTG Controller Driver, switching control of the USB port between the gadget stack (as summarized above) and the USB host stack.

Endpoint autoconfiguration hides some hardware-specific initialization issues from gadget drivers, such as endpoint addressing simple gadget drivers may no longer need hardware-specific logic. (USB Wireless Mobile class devices use such configurations.) Configuration buffer utilities combine null-terminated lists of USB descriptors, so itвЂ™s easier to work with multiple or complex configurations.

MediaQ 11xx, as found in the Dell Axim X5 PDA ( mq11xx_udc, 2.6 version available) Toshiba TC86c001 'Goku-S', on PCI ( goku_udc, in 2.4 and 2.6 kernels) Renesas SH3 processors: SH7705, SH7727 ( superh_udc, 2.4 version available) IntelвЂ™s PXA 25x and IXP4xx XScale/ARMv5TE processors as seen in many PDAs ( pxa2xx_udc, in 2.6 kernels with a 2.4 version available)

Intel PXA 27x XScale/ARMv5TE processors ( pxa27x_udc, 2.6 version in development) Atmel AT91 ARMv4T and ARMv5TEJ processors ( at91_udc, a 2.6 version) Samsung S3C2410 ARMv4T processors ( s3c2410_udc, 2.6 version in use with Ipaq h1940) Sharp LH7A40x ARMv4T processors ( lh7a40x_udc, in 2.6 kernel) Texas Instruments OMAP processors, including ARMv5TEJ models ( omap_udc, in 2.6 kernel) with USB OTG capabilities. National 9603/4 ( n9604_udc, 2.4 version available)

Mentor Graphics supplies a preliminary GPLвЂ™d high speed stack, building on the gadget API and used with chips integrating their silicon design.