UM0851 datasheet(183/245 Pages) STMICROELECTRONICS

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UM0851

Human interface device (HID) drivers

Doc ID 16604 Rev 2

183/245

'value' is the value the event carries. Either a relative change for EV_REL, absolute new

value for EV_ABS (joysticks ...), or 0 for EV_KEY for release, 1 for key press and 2 for

autorepeat

7.2.5

Configuration options

References

●

Linux-2.6.27/Documentation/input/input.txt

●

Linux-2.6.27/Documentation/input/input-programming.txt

7.3

ADC driver

This section describes the ADC controller driver.

7.3.1

Hardware overview

An analog-to-digital converter, or simply ADC, is a semiconductor device that converts an

analog signal to digital codes that consist of 1's and 0's. In the real world, most of the signals

sensed and processed by humans are analog signals. Analog-to-digital conversion is the

primary means by which analog signals are converted into digital data that can be

processed by computers for various purposes.

Table 48.

Keypad configuration options

Configuration option

Comment

CONFIG_INPUT

This option enables input device (mouse, keyboard, Touchscreen,

joystick etc) connected to the system

CONFIG_INPUT_EVDEV

This option make input device events be accessible under char

device 13:64+ - /dev/input/eventX in a generic way

CONFIG_INPUT_KEYBOARD

Enables KEYBOARD devices.

CONFIG_

KEYBOARD_SPEAR

Enables spear keypad support.

UM0851 Datasheet(PDF) 183 Page - STMicroelectronics