Difference between revisions of "TSC2102 Linux driver"

Revision as of 17:25, 17 November 2007

Driver 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

TSLib API Installation

Install the touchscreen API tslib

Architecture

Usage

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/temp1_input   -- result in m°C

• play sounds through ALSA interface

Envt variables

• You should define some ENVT variables to use the touchscreen API (tslib):

export TSLIB_TSDEVICE=/dev/input/event0
export TSLIB_TSEVENTTYPE=INPUT
export TSLIB_CONFFILE=/etc/ts.conf
export TSLIB_CALIBFILE=/etc/pointercal

Device file creation if not exist

• /dev/input/event0 is created from the infos got from:

# cat /sys/class/input/event0/dev
13:64
# mkdir /dev/input
# cd /dev/input/
# mknod event0 c 13 64
# ls -al
drwxr-xr-x    2 root     root            0 Jan  1 00:39 .
drwxr-xr-x    5 root     root            0 Jan  1 00:39 ..
crw-r--r--    1 root     root      13,  64 Jan  1 00:39 event0
#

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
#

or start the touchscreen calibration tool:

/usr/bin/ts_calibrate

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