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Microchip Technology, Inc.

AR1020-AR1021-LINUX-SPI-I2C-V102

Page 1 of 26

AR1020/AR1021 SPI/I2C Open Source Linux Driver

Documentation

Document #:

AD-110029- 200

Title:

AR1020/AR1021 SPI/I2C Open Source Linux Driver Documentation

Subtitle:

Date:

27-April-2012

Description:

This document describes the reference AR1020/AR1021 SPI-I2C driver

software developed for Linux.

Microchip Technology, Inc.

AR1020-AR1021-LINUX-SPI-I2C-V102

Page 2 of 26

Revision History

Version

Date

Description

001

01/03/2011

Initial Revision

002

04/27/2012

Updated for AR1011/AR1021 release.

Microchip Technology, Inc.

AR1020-AR1021-LINUX-SPI-I2C-V102

Page 3 of 26

Table of Contents

AD-110029-002 ............................................................................................................................................ 1

AR1020/AR1021 SPI-I2C OPEN SOURCE LINUX DRIVER DOCUMENTATION 1...........................

1.0 INTRODUCTION ............................................................................................................................ 4

2.0 INSTALLATION OF THE DRIVER ............................................................................................. 4

2.1 P RELIMINARY STEPS ........................................................................................................................ 4

2.2 I 2C INTERFACE SPECIFIC STEPS ........................................................................................................ 4

2.2.1 Connecting the controller to the embedded board .................................................................. 4

2.2.2 Setting up the Linux kernel source ......................................................................................... 5

2.2.2.1 Automatic conguration 5 ....................................................................................................................

2.2.2.2 Manual conguration ......................................................................................................................... 5

2.2.3 Setting up the board’s platform specific settings .................................................................... 6

2.3 SPI INTERFACE SPECIFIC STEPS ........................................................................................................ 6

2.3.1 Connecting the controller to the embedded board .................................................................. 6

2.3.2 Setting up the Linux kernel source ......................................................................................... 7

2.3.2.1 Automatic conguration 7 ....................................................................................................................

2.3.2.2 Manual conguration ......................................................................................................................... 7

2.3.3 Setting up the board’s platform specific settings .................................................................... 8

2.4 U PDATING ARGET YSTEMT S ............................................................................................................ 8

2.4.1 Setting up debugging .............................................................................................................. 8

2.4.1.1 Increasing kernel log level using kernel parameters ........................................................................... 8

2.4.2 Overview of updating kernel on embedded target .................................................................10

2.4.3 Activating driver as kernel module ........................................................................................10

2.4.4 Verifying touch packets from driver ......................................................................................10

2.4.4.1 Monitoring kernel debug messages .................................................................................................. 11

2.4.4.2 Building inputverify application 11 ......................................................................................................

2.4.4.3 Finding a device path using inputverify ........................................................................................... 11

2.4.4.4 Reading packet data using inputverify ............................................................................................. 12

2.5 D RIVER DIAGNOSTIC TOOLS ...........................................................................................................12

2.5.1 Verifying complete driver conguration ...............................................................................12

2.5.2 Verifying controller bus data .................................................................................................13

2.5.3 Verifying/probing touch IRQ ID ...........................................................................................14

2.5.4 Setting touch IRQ using a kernel parameter ..........................................................................15

COMMAND COMMUNICATION .....................................................................................................................15

2.5.5 Controller commands from an application ............................................................................15

2.5.5.1 Leading zero on I 2C controller commands ....................................................................................... 16

2.5.5.2 I 2C inter-byte delays on host- -controller writes to ............................................................................. 16

3.0 CALIBRATION METHODS .........................................................................................................17

3.1 C ONSOLE CALIBRATION .................................................................................................................17

3.1.1 Using built- in kernel driver’s software calibration ................................................................17

3.1.2 Using controller’s hardware calibration feature.....................................................................19

3.2 C ALIBRATION UNDER THE NDROID A OS ........................................................................................20

3.2.1 Installing Android driver calibration tool package ................................................................20

3.2.2 Compiling Android calibration from source ..........................................................................22

3.2.3 Adjusting calibration inset .....................................................................................................22

3.3 T SLIB ..............................................................................................................................................22