Run a program when DP monitor is plugged in/out

[c.a.subramaniam@gmail.com (Subramaniam Appadodharana)]

Hi Arun,

Yes I think you can use uevent. Since it is a DP monitor, and it has an
associated driver, it should have an associated sysfs entry? You can send a
uevent to the dev node within the sysfs. I havent used this myself except
for request_firmware().
https://www.kernel.org/doc/pending/hotplug.txt



On Fri, Apr 11, 2014 at 10:46 AM, pramod gurav
<pramod.gurav.etc@gmail.com>wrote:

> Hi Arun,
>
> If it is just an event you want to send across to user space how about
> kernel input sub system. Your userspace can poll on the input device node.
> Once the event is received from kernel it can launch a script or do what
> you say you want to do.
>
>
> On Fri, Apr 11, 2014 at 6:49 PM, arun c <arun.edarath@gmail.com> wrote:
>
>> Hi,
>>
>> I want to run a program when DP monitor is plugged in/out.
>> My linux kernel ( 3.14.0-00348-gbfcbf45) gets an interrupt when DP cable
>> is removed or inserted.
>> From the graphics driver interrupt handler I can differentiate the two
>> events.
>>
>> I want to run a user space program when this removal/insertion happens.
>> What are the possible
>> ways to achieve this?
>>
>> when I google for this I am seeing examples related to udev(How to run a
>> script when a usb device is inserted/removed); but in my case it is not
>> device insertion/removal. There is no need for a device creation when the
>> DP monitor is plugged in/out(There is no device node available for me).
>> Basically I want to send this removal/insertion event from my kernel
>> interrupt handler to
>> user space program.
>>
>> Regards,
>> Arun C
>>
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>>
>
>
> --
> Thanks and Regards
> Pramod
>
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