linux-kernel - Re: [PATCH v2 4/7] media: uvcvideo: Refactor uvc_ctrl_mappings

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Date:   Fri, 6 Jan 2023 22:45:48 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Ricardo Ribalda <ribalda@...omium.org>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, Yunke Cao <yunkec@...omium.org>,
        linux-kernel@...r.kernel.org,
        Sergey Senozhatsky <senozhatsky@...omium.org>
Subject: Re: [PATCH v2 4/7] media: uvcvideo: Refactor uvc_ctrl_mappings_uvcXX

Hi Ricardo,

Thank you for the patch.

On Thu, Jan 05, 2023 at 02:52:55PM +0100, Ricardo Ribalda wrote:
> Convert the array of structs into an array of pointers, that way the
> mappings can be reused.
> 
> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
> ---
>  drivers/media/usb/uvc/uvc_ctrl.c | 81 +++++++++++++++++++---------------------
>  1 file changed, 39 insertions(+), 42 deletions(-)
> 
> diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
> index 2ebe5cc18ad9..9af64f7a23d3 100644
> --- a/drivers/media/usb/uvc/uvc_ctrl.c
> +++ b/drivers/media/usb/uvc/uvc_ctrl.c
> @@ -723,34 +723,40 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
>  	},
>  };
>  
> -static const struct uvc_control_mapping uvc_ctrl_mappings_uvc11[] = {
> -	{
> -		.id		= V4L2_CID_POWER_LINE_FREQUENCY,
> -		.entity		= UVC_GUID_UVC_PROCESSING,
> -		.selector	= UVC_PU_POWER_LINE_FREQUENCY_CONTROL,
> -		.size		= 2,
> -		.offset		= 0,
> -		.v4l2_type	= V4L2_CTRL_TYPE_MENU,
> -		.data_type	= UVC_CTRL_DATA_TYPE_ENUM,
> -		.menu_info	= power_line_frequency_controls,
> -		.menu_mask	= GENMASK(V4L2_CID_POWER_LINE_FREQUENCY_60HZ,
> -					  V4L2_CID_POWER_LINE_FREQUENCY_DISABLED),
> -	},
> +static const struct uvc_control_mapping uvc_ctrl_power_line_mapping_uvc11 = {
> +	.id		= V4L2_CID_POWER_LINE_FREQUENCY,
> +	.entity		= UVC_GUID_UVC_PROCESSING,
> +	.selector	= UVC_PU_POWER_LINE_FREQUENCY_CONTROL,
> +	.size		= 2,
> +	.offset		= 0,
> +	.v4l2_type	= V4L2_CTRL_TYPE_MENU,
> +	.data_type	= UVC_CTRL_DATA_TYPE_ENUM,
> +	.menu_info	= power_line_frequency_controls,
> +	.menu_mask	= GENMASK(V4L2_CID_POWER_LINE_FREQUENCY_60HZ,
> +				  V4L2_CID_POWER_LINE_FREQUENCY_DISABLED),
>  };
>  
> -static const struct uvc_control_mapping uvc_ctrl_mappings_uvc15[] = {
> -	{
> -		.id		= V4L2_CID_POWER_LINE_FREQUENCY,
> -		.entity		= UVC_GUID_UVC_PROCESSING,
> -		.selector	= UVC_PU_POWER_LINE_FREQUENCY_CONTROL,
> -		.size		= 2,
> -		.offset		= 0,
> -		.v4l2_type	= V4L2_CTRL_TYPE_MENU,
> -		.data_type	= UVC_CTRL_DATA_TYPE_ENUM,
> -		.menu_info	= power_line_frequency_controls,
> -		.menu_mask	= GENMASK(V4L2_CID_POWER_LINE_FREQUENCY_AUTO,
> -					  V4L2_CID_POWER_LINE_FREQUENCY_DISABLED),
> -	},
> +static const struct uvc_control_mapping *uvc_ctrl_mappings_uvc11[] = {
> +	&uvc_ctrl_power_line_mapping_uvc11,
> +	NULL, /* Sentinel */
> +};
> +
> +static const struct uvc_control_mapping uvc_ctrl_power_line_mapping_uvc15 = {
> +	.id		= V4L2_CID_POWER_LINE_FREQUENCY,
> +	.entity		= UVC_GUID_UVC_PROCESSING,
> +	.selector	= UVC_PU_POWER_LINE_FREQUENCY_CONTROL,
> +	.size		= 2,
> +	.offset		= 0,
> +	.v4l2_type	= V4L2_CTRL_TYPE_MENU,
> +	.data_type	= UVC_CTRL_DATA_TYPE_ENUM,
> +	.menu_info	= power_line_frequency_controls,
> +	.menu_mask	= GENMASK(V4L2_CID_POWER_LINE_FREQUENCY_AUTO,
> +				  V4L2_CID_POWER_LINE_FREQUENCY_DISABLED),
> +};
> +
> +static const struct uvc_control_mapping *uvc_ctrl_mappings_uvc15[] = {
> +	&uvc_ctrl_power_line_mapping_uvc15,
> +	NULL, /* Sentinel */
>  };
>  
>  /* ------------------------------------------------------------------------
> @@ -2506,8 +2512,7 @@ static void uvc_ctrl_prune_entity(struct uvc_device *dev,
>  static void uvc_ctrl_init_ctrl(struct uvc_video_chain *chain,
>  			       struct uvc_control *ctrl)
>  {
> -	const struct uvc_control_mapping *mappings;
> -	unsigned int num_mappings;
> +	const struct uvc_control_mapping **mappings;
>  	unsigned int i;
>  
>  	/*
> @@ -2574,21 +2579,13 @@ static void uvc_ctrl_init_ctrl(struct uvc_video_chain *chain,
>  	}
>  
>  	/* Finally process version-specific mappings. */
> -	if (chain->dev->uvc_version < 0x0150) {
> -		mappings = uvc_ctrl_mappings_uvc11;
> -		num_mappings = ARRAY_SIZE(uvc_ctrl_mappings_uvc11);
> -	} else {
> -		mappings = uvc_ctrl_mappings_uvc15;
> -		num_mappings = ARRAY_SIZE(uvc_ctrl_mappings_uvc15);
> -	}
> -
> -	for (i = 0; i < num_mappings; ++i) {
> -		const struct uvc_control_mapping *mapping = &mappings[i];
> +	mappings = (chain->dev->uvc_version < 0x0150) ? uvc_ctrl_mappings_uvc11

No need for parentheses.

> +						      : uvc_ctrl_mappings_uvc15;
>  
> -		if (uvc_entity_match_guid(ctrl->entity, mapping->entity) &&
> -		    ctrl->info.selector == mapping->selector)
> -			__uvc_ctrl_add_mapping(chain, ctrl, mapping);
> -	}
> +	for (i = 0; mappings[i]; ++i)

Missing curly braces.

Let's add a local mapping variable:

	for (i = 0; mappings[i]; ++i) {
		const struct uvc_control_mapping *mapping = &mappings[i];

		if (uvc_entity_match_guid(ctrl->entity, mapping->entity) &&
		    ctrl->info.selector == mapping->selector)
			__uvc_ctrl_add_mapping(chain, ctrl, mapping);
	}

I'll address this when applying.

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> +		if (uvc_entity_match_guid(ctrl->entity, mappings[i]->entity) &&
> +		    ctrl->info.selector == mappings[i]->selector)
> +			__uvc_ctrl_add_mapping(chain, ctrl, mappings[i]);
>  }
>  
>  /*
> 

-- 
Regards,

Laurent Pinchart