Ssp Otg-usb Driver Download
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Gadget drivers declare themselves through a structusb_gadget_driver, which is responsible for most parts of enumerationfor a struct usb_gadget. The response to a set_configuration usuallyinvolves enabling one or more of the struct usb_ep objects exposed bythe gadget, and submitting one or more struct usb_request buffers totransfer data. Understand those four data types, and their operations,and you will understand how this API works.
Drivers will normally be arranged so that just loading the gadget drivermodule (or statically linking it into a Linux kernel) allows theperipheral device to be enumerated, but some drivers will deferenumeration until some higher level component (like a user mode daemon)enables it. Note that at this lowest level there are no policies abouthow ep0 configuration logic is implemented, except that it should obeyUSB specifications. Such issues are in the domain of gadget drivers,including knowing about implementation constraints imposed by some USBcontrollers or understanding that composite devices might happen to bebuilt by integrating reusable components.
Note that the lifecycle above can be slightly different for OTG devices.Other than providing an additional OTG descriptor in each configuration,only the HNP-related differences are particularly visible to drivercode. They involve reporting requirements during the SET_CONFIGURATIONrequest, and the option to invoke HNP during some suspend callbacks.Also, SRP changes the semantics of usb_gadget_wakeup slightly.
Gadget drivers rely on common USB structures and constants defined inthe linux/usb/ch9.h header file, which is standard inLinux 2.6+ kernels. These are the same types and constants used by host sidedrivers (and usbcore).
the bus controller driver lists all the general purpose endpoints ingadget->ep_list. the control endpoint (gadget->ep0) is not in that list,and is accessed only in response to a driver setup() callback.
Values of the three OTG device feature flags are updated before thesetup() call corresponding to USB_REQ_SET_CONFIGURATION, and beforedriver suspend() calls. They are valid only when is_otg, and when thedevice is acting as a B-Peripheral (so is_a_peripheral is false).
If gadget->is_otg is true, the gadget driver must provide an OTGdescriptor during enumeration, or else fail the bind() call. In suchcases, no USB traffic may flow until both bind() returns withouthaving called usb_gadget_disconnect(), and the USB host stack hasinitialized.
The usb controller driver handles a few standard usb requests. Thoseinclude set_address, and feature flags for devices, interfaces, andendpoints (the get_status, set_feature, and clear_feature requests).
Gadget drivers could use this when constructing a config descriptorin response to USB_REQ_GET_DESCRIPTOR. They will need to patch theresulting bDescriptorType value if USB_DT_OTHER_SPEED_CONFIG is needed.
The core API is sufficient for writing drivers for composite USB devices(with more than one function in a given configuration), and alsomulti-configuration devices (also more than one function, but notnecessarily sharing a given configuration). There is however an optionalframework which makes it easier to reuse and combine functions.
A single USB function uses one or more interfaces, and should in mostcases support operation at both full and high speeds. Each function isassociated by usb_add_function() with a one configuration; that functioncauses bind() to be called so resources can be allocated as part ofsetting up a gadget driver. Those resources include endpoints, whichshould be allocated using usb_ep_autoconfig().
A more complex strategy might encapsulate a usb_function structure insidea driver-specific instance structure to allows multiple activations. Anexample of multiple activations might be a CDC ACM function that supportstwo or more distinct instances within the same configuration, providingseveral independent logical data links to a USB host.
Configurations are building blocks for gadget drivers structured aroundfunction drivers. Simple USB gadgets require only one function and oneconfiguration, and handle dual-speed hardware by always providing the samefunctionality. Slightly more complex gadgets may have more than onesingle-function configuration at a given speed; or have configurationsthat only work at one speed.
Before returning from bind, various fields in the template descriptormay be overridden. These include the idVendor/idProduct/bcdDevice valuesnormally to bind the appropriate host side driver, and the three strings(iManufacturer, iProduct, iSerialNumber) normally used to provide usermeaningful device identifiers. (The strings will not be defined unlessthey are defined in dev and strings.) The correct ep0 maxpacket sizeis also reported, as defined by the underlying controller driver.
Helper macro for USB gadget composite drivers which do not do anythingspecial in module init/exit. This eliminates a lot of boilerplate. Eachmodule may only use this macro once, and calling it replaces module_init()and module_exit()
usb_interface_id() is called from usb_function.:c:func:bind() callbacks toallocate new interface IDs. The function driver will then store thatID in interface, association, CDC union, and other descriptors. Itwill also handle any control requests targeted at that interface,particularly changing its altsetting via set_alt(). There mayalso be class-specific or vendor-specific requests to handle.
The first hardware supporting this API was the NetChip 2280 controller,which supports USB 2.0 high speed and is based on PCI. This is thenet2280 driver module. The driver supports Linux kernel versions 2.4and 2.6; contact NetChip Technologies for development boards and productinformation.
A partial USB simulator, the dummy_hcd driver, is available. It canact like a net2280, a pxa25x, or an sa11x0 in terms of availableendpoints and device speeds; and it simulates control, bulk, and to someextent interrupt transfers. That lets you develop some parts of a gadgetdriver on a normal PC, without any special hardware, and perhaps withthe assistance of tools such as GDB running with User Mode Linux. Atleast one person has expressed interest in adapting that approach,hooking it up to a simulator for a microcontroller. Such simulators canhelp debug subsystems where the runtime hardware is unfriendly tosoftware development, or is not yet available.
This topic explains how to test the interoperability of USB Type-C enabled systems and Windows. It provides guidelines for device and system manufacturers to perform various functional and stress tests on systems and devices that expose a USB Type-C connector. It assumes that the reader is familiar with the official USB specification and xHCI interoperability test procedures, which can be downloaded from USB.ORG.
If your test system is unable to reach a Sleep or Hibernate state, make sure that all devices in the system have the latest device drivers installed. One of the most common causes is an unsupported video card in the system.
NOTICE: SP_MIN: Built : 13:13:37, Oct 2 2018INFO: ARM GICv2 driver initializedINFO: stm32mp HSI (18): Secure onlyINFO: stm32mp HSE (20): Secure onlyINFO: stm32mp PLL2 (27): Secure onlyINFO: stm32mp PLL2_R (30): Secure onlyINFO: SP_MIN: Initializing runtime servicesINFO: SP_MIN: Preparing exit to normal world
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