UM0851 datasheet(62/245 Pages) STMICROELECTRONICS

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Communication device drivers

UM0851

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Doc ID 16604 Rev 2

Figure 13.

USB driver overview

A good number of online documents related to USB can be found at:

●

The official USB website

●

The USB FAQ

●

Compaq's OHCI standard

●

Intel's UHCI standard

●

Intel's EHCI standard.

4.3.2

USB host API

Linux provides two host control drivers (Linux EHCI & Linux OHCI). The architecture driver

plugs into the USB host stack and allocates the basic resources for the USB host controller.

The host-side drivers for USB devices talk to the "usbcore" APIs. There are standard details

of the API available.

The details of the USB Host APIs could be found online at the following address.

http://www.kernel.org/doc/htmldocs/usb.html

4.3.3

USB host usage

A USB device can either use a custom driver or use one already present in the system. This

is based on the concept of a device class and means that if a device belongs to a certain

class, then the other devices of the same class can make use of the same device driver.

Some of these classes are: the USB HID (human interface devices) class which covers input

devices like keyboards and mice, the USB Mass storage devices class which covers devices

like pen drives, digital cameras, audio players etc and the USB CDC (communication

devices class) which essentially covers USB modems and similar devices.

Application

UHCI/EHCI

Hardware

Kernel space

User space

Mass storage

Other USB

class drivers

USB core

UHC driver

Other controller

drivers

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