AM335X using I2C TCA8418 keypad

This question appears to be more about the AM335x Linux software than the TCA8418e, so I am moving this to the Sitara forum where someone who better understands the software can help you.

Hi,

I will forward this to the SW team.

Hi Anil,

Check  Documentation/devicetree/bindings/input/omap-keypad.txt & Documentation/devicetree/bindings/input/tca8418_keypad.txt.

Suppose you've connected the TCA8418 to I2C1. Your abstraction should look something like ( some modifications may be needed to fit your hardware):

&i2c1 {

     status = "okay";

     pinctrl-names = "default", "sleep";

     pinctrl-0 = <&i2c1_pins_default>;

     pinctrl-0 = <&i2c1_pins_sleep>;         

....................................................

             tca8418_keypad@i2c address  {

                                   compatible =  "ti, tca8418";

                                   reg = <i2c address>

                                   keypad,num-rows =  <8>;

                                   keypad,num-columns = <10>;  

                                   linux,keypad-no-autorepeat;

                                   interrupt-parent = <&gpio1>;

                                   interrupts = <list of irqs >

                                   status = "okay";

           };

......................

.....................

} ; 

Hope this helps. 

Best Regards, 
Yordan

Hi Yordan,

Thanks for your response. I have defined in my Linux 3.2 with the below key-map code in separate function. How do i call in Linux 3.12 with the below keymap code with values.

tca8418_keypad@0x34 {
compatible = "ti, tca8418";
reg = <0x34 >
keypad,num-rows = <7>;
keypad,num-columns = <7>;
linux,keymap = <KEY_0
KEY_1
KEY_2
KEY_3
KEY_4
KEY_5
KEY_6
KEY_A
KEY_B
KEY_C
KEY_D
KEY_E
KEY_F
KEY_G
KEY_H
KEY_I >;
linux,keypad-no-autorepeat;
interrupt-parent = <&gpio1>;
interrupts = <29 IRQ_TYPE_NONE >
status = "okay";
};

Please explain me, i am not familiar with .dts for modification under Linux 3.12/3.14. Please do the needful.

Regards,
Anil.

Hi Yordan,

Is this is the way is to call keymap values, In Linux 3.2 i have created this as platform driver and called with main driver, It is working.

It is not working with this logic.  Please help me.

Regards,

Anil

Hi,

Still i stuck on the same place.

Please help me how should i get the key values in my application

Regards,

Anil

Hi Anil,

Sorry for the delayed response, I was OoO for a while.

The linux,keymap element is described in Documentation/devicetree/bindings/input/matrix-keypad.txt :
- linux,keymap: an array of packed 1-cell entries containing the equivalent
of row, column and linux key-code. The 32-bit big endian cell is packed
as:
row << 24 | column << 16 | key-code
Please check the document & example provided there to fit your use case.

Best Regards,
Yordan

Hi Yordan,

Still i am not yet success in my project except qwerty keypad.

the keypad tca8418 interface has created under i2c nodes and showing the address as well. when i tried to capture something from cat /dev/input/event1 is continuously coming some raw characters. It shouldn't like this, when i trigger my any qwerty keys it should generate the raw values. But continuously coming the raw values.

When i did the exercise for my LCD Touch screen cat /dev/input/event0 it is coming as per as per touch raw values.

How to fix my problem.

Regards,

Anil