topic Re: When ever i press the button it need to run a shell command in i.MX Processors

When ever i press the button it need to run a shell command

aravinthkumarja — Wed, 11 Oct 2017 12:04:37 GMT

Hi All,

I'm using iMX6 sabresd board and Android 6 platform. Any one of gpio i configured as button.

When ever the user press the button, i need to run a shell command(or shell script) on board.

How can i do this .?

Regards,

Aravinth

Re: When ever i press the button it need to run a shell command

Carlos_Musich — Wed, 11 Oct 2017 18:21:16 GMT

Hi,

in the following link you will find the code for a .ko module which handles a GPIO interrupt and the device tree configuration required for this.

Issue with configuring GPIO as an interrupt - i.MX6Q

For the shell command you can just use a system call E.g. sytem("command");

Regards,
Carlos

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Re: When ever i press the button it need to run a shell command

aravinthkumarja — Thu, 12 Oct 2017 07:07:15 GMT

Hi Carlos,

Thanks for your response. For system function what library i have to use in imx6 kernel.?

Regards,

Aravinth

Re: When ever i press the button it need to run a shell command

Carlos_Musich — Thu, 12 Oct 2017 13:37:50 GMT

it is stdio.h, this is a general C question, you can find a lot of information if you Google "linux shell command in c program" or "linux c system function".

Re: When ever i press the button it need to run a shell command

aravinthkumarja — Fri, 13 Oct 2017 03:52:34 GMT

Hi carlos,

I have used system function in normal c application. But in kernel code we can't add stdio.h. So i'm not able to use system function in kernel.!

Regards,

Aravinth

Re: When ever i press the button it need to run a shell command

Carlos_Musich — Mon, 16 Oct 2017 20:02:08 GMT

You can make an application that communicates with the kernel module. So the module will use copy_to_user function to tell the applications that a button was pressed and the application will execute the shell command.

Re: When ever i press the button it need to run a shell command

aravinthkumarja — Tue, 17 Oct 2017 06:24:19 GMT

Thanks for your response Carlos. I have used call_usermodehelper function to call shell command in kernel.

Regards,

Aravinth