From mboxrd@z Thu Jan  1 00:00:00 1970
From: Hans Verkuil <hverkuil@xs4all.nl>
Subject: Re: [PATCH 5/5] [media] tc358743: allow event subscription
Date: Mon, 13 Jul 2015 13:07:15 +0200
Message-ID: <55A39BE3.2070905@xs4all.nl>
References: <1436533897-3060-1-git-send-email-p.zabel@pengutronix.de> <1436533897-3060-5-git-send-email-p.zabel@pengutronix.de>
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To: Philipp Zabel <p.zabel@pengutronix.de>, Mats Randgaard <matrandg@cisco.com>
Cc: linux-media@vger.kernel.org, devicetree@vger.kernel.org, kernel@pengutronix.de
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On 07/10/2015 03:11 PM, Philipp Zabel wrote:
> This is useful to subscribe to HDMI hotplug events via the
> V4L2_CID_DV_RX_POWER_PRESENT control.
> 
> Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
> ---
>  drivers/media/i2c/tc358743.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/media/i2c/tc358743.c b/drivers/media/i2c/tc358743.c
> index 4a889d4..91fffa8 100644
> --- a/drivers/media/i2c/tc358743.c
> +++ b/drivers/media/i2c/tc358743.c
> @@ -40,6 +40,7 @@
>  #include <media/v4l2-dv-timings.h>
>  #include <media/v4l2-device.h>
>  #include <media/v4l2-ctrls.h>
> +#include <media/v4l2-event.h>
>  #include <media/v4l2-of.h>
>  #include <media/tc358743.h>
>  
> @@ -1604,6 +1605,8 @@ static const struct v4l2_subdev_core_ops tc358743_core_ops = {
>  	.s_register = tc358743_s_register,
>  #endif
>  	.interrupt_service_routine = tc358743_isr,
> +	.subscribe_event = v4l2_ctrl_subdev_subscribe_event,

Ah, they are set here.

But note that v4l2_ctrl_subdev_subscribe_event is not enough, since this driver
also issues the V4L2_EVENT_SOURCE_CHANGE event.

See this patch on how to do that:

http://git.linuxtv.org/cgit.cgi/hverkuil/media_tree.git/commit/?h=for-v4.3a&id=85c9b0b83795dac3d27043619a727af5c7313fe7

Note: requires the new v4l2_subdev_notify_event function that's not yet
merged (just posted the pull request for that).

Regards,

	Hans

> +	.unsubscribe_event = v4l2_event_subdev_unsubscribe,
>  };
>  
>  static const struct v4l2_subdev_video_ops tc358743_video_ops = {
>