topic Keypad mapping in i.MX Processors

Keypad mapping

rizwan_s — Mon, 10 Jul 2017 09:28:09 GMT

I am trying to interface 4X5 keypad with i-MX6 quad . I am using linux 3.14.38 kernel with default imx_keypad.c driver.

I have done the required iomux changes

How can i do keypad mapping in dts file for standard keypad?

my keypad is 4*5 and looks similar as the attached image.

&kpp {
    pinctrl-names = "default";
    pinctrl-0 = <&pinctrl_kpp_1>;
    keypad,num-rows = <5>;
    keypad,num-columns = <4>;

    linux,keymap = <
           0X00040031 //number 1 with row 0 column 0 and 31 hex value for number"1"
           0X00010032 //2

>;
status = "okay";
};

0X00040031 //number 1 with row 0 column 0 and 31 hex value for number"1"

i need to make a mapping for alphabets abc when 2 is pressed.

how can i make it?

please suggest

Thanks and Regards

Rizwan Syed

Re: Keypad mapping

igorpadykov — Mon, 10 Jul 2017 11:03:03 GMT

Hi Rizvan

please look at linux/Documentation/devicetree/bindings/input/imx-keypad.txt

linux-2.6-imx.git - Freescale i.MX Linux Tree

Best regards
igor
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Re: Keypad mapping

rizwan_s — Mon, 10 Jul 2017 11:30:47 GMT

Hi Igor,

Thank you for your reply.

With the above mentioned link, i can map row column and particular hex value for digit or number.

But Characters A-Z are spread over keys 2-9 in alphabetic order. The placement of characters is similar on most mobile phones. For example, the 2-key is pressed once for A, twice for B, and three times for C.

How can i make keypad mapping for the above query?

Please suggest

Thanks and Regards

Rizwan Syed

Re: Keypad mapping

chandrasekhar_a — Fri, 11 Aug 2017 14:30:47 GMT

We also want to do the key mapping like normal phone keypad. If you got any clue in the above case suggest us also.

Re: Keypad mapping

rizwan_s — Mon, 14 Aug 2017 05:08:02 GMT

Hi Chandra sekhar,

You need to include all the keys which are in your keypad in DTS file.

Then map the particular key based on row and column in driver.

Thanks and Regards

Rizwan Syed

Re: Keypad mapping

chandrasekhar_a — Mon, 14 Aug 2017 11:19:04 GMT

hi Rizwan Syed

Could you kindly send us the sample DTS file to include key mapping so

that i can get the alpha-numneric keypad which is present in so many

keypad phones.

Regards,

A.Chandrasekhar

Re: Keypad mapping

rizwan_s — Wed, 16 Aug 2017 05:07:23 GMT

Hi Chandrasekhar,

Please update all the keys in your dts file.

for example if u have 26 keys from A to Z and numbers from 1 to 9 .then you should have 26 + 10 =36 lines of mapping in your dts file

0xAAAAAA02 (number 1 value is 02)

0xAAAAAA03 (number 2 value is 03)

0xAAAAAA04 (number 3 value is 04)

and so on..

AAAAAA can be anything, it does not matter.last 2 digits should match with your alphabet or number .

In driver you may need to make an array with your keypad values according to row and column.then modify the driver mapping to that array.

Thanks and Regards

Rizwan Syed