TSC2102 Linux driver
From ArmadeusWiki
This page details the installation and the usage of the Linux drivers for the TSC2102 touchscreen & sound chip. Sound (ALSA) specific part can be found here.
Driver Installation
Drivers are now installed by default in standard Armadeus rootfs. Following instructions are only given as references or if you want to remove these drivers from your confiugration.
$ make linux26-menuconfig
in Device Drivers ---> Input device support ---> select <*> Event interface as builtin in Device Drivers ---> Input device support ---> [*] Touchscreens ---> select <M> TSC 2102 based touchscreens as module in Device Drivers ---> SPI support ---> select <M> Freescale iMX SPI controller as module in Device Drivers ---> SPI support ---> --- TSC2102 codec support should be selected in Device Drivers ---> select <M> Hardware Monitoring support ---> as module
$ make
Then reflash your Linux kernel and your Rootfs...
Architecture
| Touchscreen (tsc2102_ts.ko) | HWmon | ALSA |
|---|---|---|
| TSC2102 Main driver (tsc2102.ko) | ||
| Linux API | ||
Usage
- load all the needed drivers:
# modprobe spi_imx # modprobe tsc2102_ts TI TSC2102 driver initializing input: TSC2102 Touchscreen as /class/input/input0 TSC2102 touchscreen driver initialized
- To check:
# lsmod Module Size Used by Not tainted tsc2102_ts 1188 0 tsc2102 10192 3 tsc2102_ts hwmon 916 1 tsc2102 spi_imx 7136 0
Then, you can:
- get temperature and voltage with hwmon (Hardware Monitoring) interface. For example:
# cat /sys/class/hwmon/hwmon0/device/temp1_input -- result in m°C
- play sounds through ALSA interface
- use touchscreen with Tslib
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
#
then, after having configured Tslib, start the touchscreen calibration tool:
# /usr/bin/ts_calibrate
