Difference between revisions of "TSC2102 Linux driver"

Revision as of 15:53, 17 November 2007

Installation

$ make linux-menuconfig

in 'device driver/input device support' select 'event interface' as kernel part
in 'device driver/input device support' select 'touchscreen ->tsc2102' as module 

in 'device driver/spi support' select 'spi support ->freescale iMX spi' as module
in 'device driver/spi support' select 'spi support ->TSC2102 codec' as module

in 'device driver/hardware monitoring support' select 'hardware monitoring support' as module

Architecture

Usage

First create the event0 node if not already existing:

# cat /sys/class/input/event0/dev
# 13:64
# mkdir /dev/input
# cd /dev/input/
# mknod event0 c 13 64

Then modify the touchscreen configuration file to use raw input:

# cat /etc/ts.conf
module_raw input
module pthres pmin=1
module variance delta=30
module dejitter delta=100
module linear

and now start the drivers:

# insmod /lib/modules/drivers/hwmon/hwmon.ko
# insmod /lib/modules/drivers/spi/spi_imx.ko
# insmod /lib/modules/drivers/spi/tsc2102.ko
# insmod /lib/modules/drivers/input/touchscreen/tsc2102_ts.ko

Then:

• get temperature and voltage with hwmon (Hardware Monitoring) interface

cat /sys/class/hwmon/hwmon0/device/in0_input

• use touchscreen interface with tslib API
• play sounds through ALSA interface

Quick test

To quickly check driver fonctionnality, touch the screen and check that tsc2102 interrupts count is increasing:

# cat /proc/interrupts
          CPU0
26:          0         MPU  IMX-uart
29:         17         MPU  IMX-uart
30:         22         MPU  IMX-uart
35:         12         MPU  imx-mmc
39:         14         MPU  I2C_IMX
40:         16         MPU  imx-spi.2
41:          0         MPU  imx-spi.1
59:       3682         MPU  i.MX Timer Tick
60:          0         MPU  DMA
61:          0         MPU  DMA
110:         0        GPIO  eth0
168:         0        GPIO  tsc2102
Err:         0
#

Links

• http://source.mvista.com/git/gitweb.cgi?p=linux-omap-2.6.git;a=log;t=7 (search for TSC2102)
• http://osdir.com/ml/linux.ports.arm.omap/2006-08/msg00183.html
• Touchscreen usage on Blackfin
• Compiling TSlib
• http://www.opentom.org/Tslib
• http://www.openembedded.org/filebrowser/org.openembedded.packaged-staging/packages/tslib