linux-kernel - Re: [PATCH RFC v2 1/4] media: i2c: adv7343: add support for asynchronous probing

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Message-ID: <Pine.LNX.4.64.1304221235230.23906@axis700.grange>
Date:	Mon, 22 Apr 2013 12:38:41 +0200 (CEST)
From:	Guennadi Liakhovetski <g.liakhovetski@....de>
To:	Prabhakar Lad <prabhakar.csengg@...il.com>
cc:	LMML <linux-media@...r.kernel.org>,
	DLOS <davinci-linux-open-source@...ux.davincidsp.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Hans Verkuil <hverkuil@...all.nl>,
	Sakari Ailus <sakari.ailus@....fi>,
	Mauro Carvalho Chehab <mchehab@...hat.com>
Subject: Re: [PATCH RFC v2 1/4] media: i2c: adv7343: add support for asynchronous
 probing

Hi Prabhakar

On Mon, 22 Apr 2013, Prabhakar Lad wrote:

> From: Lad, Prabhakar <prabhakar.csengg@...il.com>
> 
> Both synchronous and asynchronous adv7343 subdevice probing is supported by
> this patch.
> 
> Signed-off-by: Lad, Prabhakar <prabhakar.csengg@...il.com>
> Cc: Guennadi Liakhovetski <g.liakhovetski@....de>
> Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> Cc: Hans Verkuil <hverkuil@...all.nl>
> Cc: Sakari Ailus <sakari.ailus@....fi>
> Cc: Mauro Carvalho Chehab <mchehab@...hat.com>
> ---
>  drivers/media/i2c/adv7343.c |   17 +++++++++++++----
>  1 files changed, 13 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/media/i2c/adv7343.c b/drivers/media/i2c/adv7343.c
> index 9fc2b98..5b1417b 100644
> --- a/drivers/media/i2c/adv7343.c
> +++ b/drivers/media/i2c/adv7343.c
> @@ -27,6 +27,7 @@
>  #include <linux/uaccess.h>
>  
>  #include <media/adv7343.h>
> +#include <media/v4l2-async.h>
>  #include <media/v4l2-device.h>
>  #include <media/v4l2-chip-ident.h>
>  #include <media/v4l2-ctrls.h>
> @@ -44,6 +45,7 @@ struct adv7343_state {
>  	struct v4l2_subdev sd;
>  	struct v4l2_ctrl_handler hdl;
>  	const struct adv7343_platform_data *pdata;
> +	struct v4l2_async_subdev_list	asdl;

Do you still need this? Don't think it's needed any more with the latest 
V4L2-async version.

Thanks
Guennadi

>  	u8 reg00;
>  	u8 reg01;
>  	u8 reg02;
> @@ -455,16 +457,22 @@ static int adv7343_probe(struct i2c_client *client,
>  				       ADV7343_GAIN_DEF);
>  	state->sd.ctrl_handler = &state->hdl;
>  	if (state->hdl.error) {
> -		int err = state->hdl.error;
> -
> -		v4l2_ctrl_handler_free(&state->hdl);
> -		return err;
> +		err = state->hdl.error;
> +		goto done;
>  	}
>  	v4l2_ctrl_handler_setup(&state->hdl);
>  
>  	err = adv7343_initialize(&state->sd);
>  	if (err)
> +		goto done;
> +
> +	state->sd.dev = &client->dev;
> +	err = v4l2_async_register_subdev(&state->sd);
> +
> +done:
> +	if (err < 0)
>  		v4l2_ctrl_handler_free(&state->hdl);
> +
>  	return err;
>  }
>  
> @@ -473,6 +481,7 @@ static int adv7343_remove(struct i2c_client *client)
>  	struct v4l2_subdev *sd = i2c_get_clientdata(client);
>  	struct adv7343_state *state = to_state(sd);
>  
> +	v4l2_async_unregister_subdev(&state->sd);
>  	v4l2_device_unregister_subdev(sd);
>  	v4l2_ctrl_handler_free(&state->hdl);
>  
> -- 
> 1.7.4.1
> 

---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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