Advantech RSB-4210 Evaluation Kit User Manual download pdf (Page 100)

RSB-4210 User Manual 92

Device drivers are the modules that generate events. The events are however not

useful without being handled, so you also will need to use some of the modules from

section 3.10.9.3.2.

A. usbhid

usbhid is the largest and most complex driver of the whole suite. It handles all HID

devices, and because there is a very wide variety of them, and because the USB

HID specification isn't simple, it needs to be this big.

Currently, it handles USB mice, joysticks, gamepads, steering wheels keyboards,

trackballs and digitizers.

However, USB uses HID also for monitor controls, speaker controls, UPSs, LCDs

and many other purposes.

The monitor and speaker controls should be easy to add to the hid/input interface,

but for the UPSs and LCDs it doesn't make much sense. For this, the hiddev inter-

face was designed. See Documentation/usb/hiddev.txt for more information about

it.

The usage of the usbhid module is very simple, it takes no parameters, detects

everything automatically and when a HID device is inserted, it detects it appropri-

ately.

However, because the devices vary wildly, you might happen to have a device that

doesn't work well. In that case #define DEBUG at the beginning of hid-core.c and

send me the syslog traces.

B. usbmouse

For embedded systems, for mice with broken HID descriptors and just any other

use when the big usbhid wouldn't be a good choice, there is the usbmouse driver.

It handles USB mice only. It uses a simpler HIDBP protocol. This also means the

mice must support this simpler protocol. Not all do. If you don't have any strong

reason to use this module, use usbhid instead.

C. usbkbd

Much like usbmouse, this module talks to keyboards with a simplified HIDBP proto-

col. It's smaller, but doesn't support any extra special keys. Use usbhid instead if

there isn't any special reason to use this.

D. wacom

This is a driver for Wacom Graphire and Intuos tablets. Not for Wacom PenPart-

ner, that one is handled by the HID driver. Although the Intuos and Graphire tab-

lets claim that they are HID tablets as well, they are not and thus need this specific

driver.

E. iforce

A driver for I-Force joysticks and wheels, both over USB and RS232. It includes

ForceFeedback support now, even though Immersion Corp. considers the proto-

col a trade secret and won't disclose a word about it.

2. Event handlers

Event handlers distribute the events from the devices to userland and kernel, as

needed.

A. keybdev

keybdev is currently a rather ugly hack that translates the input events into archi-

tecture-specific keyboard raw mode (Xlated AT Set2 on x86), and passes them

into the handle_scancode function of the keyboard.c module. This works well

enough on all architectures that keybdev can generate rawmode on, other archi-

tectures can be added to it.

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Advantech RSB-4210 Evaluation Kit User Manual Page 100

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