Linux: Adding GT9xx touchscreen drivers to AM335x SDK

vinod kumar74

Tool/software: Linux

Hi,

I am new to the Linux and building this SDK as well. For our project, we need to include the GT9XX touch drivers. I have tried many ways which are there in the google, but could not succeed. My goal is to add the drivers to OS and made them running always. So i have added the files to "drivers/input/touchscreen", then i have modified the makefile and Kconfig which is there in the same folder. But when i am building image using "make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- zImage" command, those objects were not being created. In the .config file i could not see anything related GT9 even after making the changes in makefile and Kconfig. I had tried to add in "tisdk_am335x-evm_defconfig" file also. None of them are seems to be working. Can some one please help me on this.

Thanks,

Vinod

over 7 years ago

0 Biser Gatchev-XID over 7 years ago

TI__Guru**** 393215 points

The software team have been notified. They will respond here.

0 Wolfgang Muees1 over 7 years ago

Genius 3685 points

Have you done a

make tisdk_am335x-evm_defconfig

after modifying tisdk_am335x-evm_defconfig ?

0 Kemal R. Shakir over 7 years ago in reply to Wolfgang Muees1

TI__Guru 55345 points

Hello Vinod,

You have the GT9xx touchscreen driver included in the Processor SKD since version 2.0.0 (kernel 4.1.6).

I will use the latest Processor SDK to show you how this driver gets included in the OS.

The driver is at <Processor SDK>/board-support/linux-<version>/drivers/input/touchscreen/goodix.c
If you check the Makefile you will see this line:
obj-$(CONFIG_TOUCHSCREEN_GOODIX)   += goodix.o

In <Processor SDK>/board-support/linux-<version>/arch/arm/configs/tisdk_am335x-evm_defconfig the CONFIG_TOUCHSCREEN_GOODIX=m assigns it to build as module.

In menuconfig you can see its location and selection:
$ cd <Processor SDK>/board-support/linux-<version>/
$ ARCH=arm make menuconfig

To make the drivers running always, you have to setup a device tree node.
You can find the device tree bindings and node example at:
<Processor SDK>/board-support/linux-<version>/Documentation/devicetree/bindings/input/touchscreen/goodix.txt

Device tree bindings for Goodix GT9xx series touchscreen controller

Required properties:

- compatible       : Should be "goodix,gt911"
               or "goodix,gt9110"
               or "goodix,gt912"
               or "goodix,gt927"
               or "goodix,gt9271"
               or "goodix,gt928"
               or "goodix,gt967"
- reg           : I2C address of the chip. Should be 0x5d or 0x14
- interrupt-parent   : Interrupt controller to which the chip is connected
- interrupts       : Interrupt to which the chip is connected

Optional properties:

- irq-gpios       : GPIO pin used for IRQ. The driver uses the
              interrupt gpio pin as output to reset the device.
- reset-gpios       : GPIO pin used for reset

- touchscreen-inverted-x : X axis is inverted (boolean)
- touchscreen-inverted-y : Y axis is inverted (boolean)
- touchscreen-swapped-x-y : X and Y axis are swapped (boolean)
                             (swapping is done after inverting the axis)

Example:

   i2c@00000000 {
       /* ... */

       gt928@5d {
           compatible = "goodix,gt928";
           reg = <0x5d>;
           interrupt-parent = <&gpio>;
           interrupts = <0 0>;

           irq-gpios = <&gpio1 0 0>;
           reset-gpios = <&gpio1 1 0>;
       };

       /* ... */
   };

Best regards,
Kemal

0 vinod kumar74 over 7 years ago in reply to Wolfgang Muees1

Prodigy 130 points

Yes... I have done that.

0 vinod kumar74 over 7 years ago in reply to Kemal R. Shakir

Prodigy 130 points

Hi kemal,

Thanks for your response. I have gone through this file. But i have not find place where i can specify the details of my I2C bus and slave address. will it take from device tree from @"gt928@5d { compatible = "goodix,gt928"; ..." . If so where can i specify the I2C bus details.?

2) where can i add this
i2c@00000000 {
/* ... */

gt928@5d {
compatible = "goodix,gt928";
reg = <0x5d>;
interrupt-parent = <&gpio>;
interrupts = <0 0>;

irq-gpios = <&gpio1 0 0>;
reset-gpios = <&gpio1 1 0>;
};

/* ... */
};
in to my dts file?.

Sorry if i am asking basic questions, but i it was throwing error when i have added to am335x-blacbone.dts file. So please help me.

Thanks,
Vinod

0 Kemal R. Shakir over 7 years ago in reply to vinod kumar74

TI__Guru 55345 points

First check on which i2c line the touch screen is physically attached, then put the touch screen node within this i2c node.

0 vinod kumar74 over 7 years ago in reply to Kemal R. Shakir

Prodigy 130 points

Hi Kemal,

The device had been attached to i2c0, so i have made the change according to that. Now the dts file is building but touch is not working.

here is the configuration:
i2c@0{
goodix_ts@14 {
compatible = "goodix,gt9xx";
reg = <0x14>;
interrupt-parent = <&clkout2_pin>;
interrupts = <31>;
/* vdd_ana-supply = <&pm8226_l19>;
vcc_i2c-supply = <&pm8226_lvs1>;
goodix,rst-gpio = <&msmgpio 16 0x00>;
goodix,irq-gpio = <&msmgpio 17 0x00>; */
goodix,cfg-group0 = [
42 D0 02 00 05 05 75 01 01 0F 24
0F 64 3C 03 05 00 00 00 02 00 00
00 16 19 1C 14 8C 0E 0E 24 00 31
0D 00 00 00 83 33 1D 00 41 00 00
00 00 00 08 0A 00 2B 1C 3C 94 D5
03 08 00 00 04 93 1E 00 82 23 00
74 29 00 69 2F 00 5F 37 00 5F 20
40 60 00 F0 40 30 55 50 27 00 00
00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 14 19 00 00
50 50 02 04 06 08 0A 0C 0E 10 12
14 16 18 1A 1C 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 1D
1E 1F 20 21 22 24 26 28 29 2A 1C
18 16 14 13 12 10 0F 0C 0A 08 06
04 02 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 9C 01];
goodix,cfg-group2 = [
48 D0 02 00 05 05 75 01 01 0F 24
0F 64 3C 03 05 00 00 00 02 00 00
00 16 19 1C 14 8C 0E 0E 24 00 31
0D 00 00 00 83 33 1D 00 41 00 00
3C 0A 14 08 0A 00 2B 1C 3C 94 D5
03 08 00 00 04 93 1E 00 82 23 00
74 29 00 69 2F 00 5F 37 00 5F 20
40 60 00 F0 40 30 55 50 27 00 00
00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 14 19 00 00
50 50 02 04 06 08 0A 0C 0E 10 12
14 16 18 1A 1C 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 1D
1E 1F 20 21 22 24 26 28 29 2A 1C
18 16 14 13 12 10 0F 0C 0A 08 06
04 02 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 3C 01];
};
};

Can you please tell me what is going wrong here.

Thanks,
Vinod Kumar

0 vinod kumar74 over 7 years ago in reply to Kemal R. Shakir

Prodigy 130 points

Hi Kemal,

The driver is loading, but it is showing " Invalid config, using defaults" . Does it means configuration in dts is wrong?? Can you please help in configuring correct data.

I have copied the messages for your reference .

[ 35.927901] Goodix-TS 0-0014: ID 928, version: 1040
[ 35.958914] Goodix-TS 0-0014: Invalid config, using defaults
[ 35.986554] input: Goodix Capacitive TouchScreen as /devices/platform/ocp/44e0b000.i2c/i2c-0/0-0014/input/input0

oot@am335x-evm:/# i2cdetect -r 0
WARNING! This program can confuse your I2C bus, cause data loss and worse!
I will probe file /dev/i2c-0 using read byte commands.
I will probe address range 0x03-0x77.
Continue? [Y/n] y
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- UU -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- UU -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --

please help me on this.

Thanks and Regards,
Vinod

0 Kemal R. Shakir over 7 years ago in reply to vinod kumar74

TI__Guru 55345 points

Check your schematic again and see on which gpioX the irq-gpios and reset-gpios are tied. Then enter the correct gpios to the device tree.

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Linux: Adding GT9xx touchscreen drivers to AM335x SDK