linux-kernel - Re: [PATCH RFC] [media] adv7180.c: convert to v4l2 control framework

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Date:	Wed, 11 Jul 2012 16:05:49 +0200
From:	Hans Verkuil <hverkuil@...all.nl>
To:	Federico Vaga <federico.vaga@...il.com>
Cc:	Mauro Carvalho Chehab <mchehab@...radead.org>,
	Giancarlo Asnaghi <giancarlo.asnaghi@...com>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC] [media] adv7180.c: convert to v4l2 control framework

On Wed 11 July 2012 15:36:25 Federico Vaga wrote:
> Hi Hans,
> 
> Thank you for your review
> 
> > > +static int adv7180_init_controls(struct adv7180_state *state)
> > > +{
> > > +	v4l2_ctrl_handler_init(&state->ctrl_hdl, 2);
> > 
> > 2 -> 4, since there are 4 controls. It's a hint only, but it helps
> > optimizing the internal hash data structure.
> 
> Sure :)
> 
> > > 
> > > @@ -445,9 +402,9 @@ static const struct v4l2_subdev_video_ops
> > > adv7180_video_ops = {> 
> > >  static const struct v4l2_subdev_core_ops adv7180_core_ops = {
> > >  
> > >  	.g_chip_ident = adv7180_g_chip_ident,
> > >  	.s_std = adv7180_s_std,
> > > 
> > > -	.queryctrl = adv7180_queryctrl,
> > > -	.g_ctrl = adv7180_g_ctrl,
> > > -	.s_ctrl = adv7180_s_ctrl,
> > > +	.queryctrl = v4l2_subdev_queryctrl,
> > > +	.g_ctrl = v4l2_subdev_g_ctrl,
> > > +	.s_ctrl = v4l2_subdev_s_ctrl,
> > 
> > If adv7180 is currently *only* used by bridge/platform drivers that
> > also use the control framework, then you can remove
> > queryctrl/g/s_ctrl altogether.
> 
> I'm not sure to undestand this point. I "grepped" for the adv7180 and it 
> seem that I'm the only user of the adv7180 (sta2x11 VIP driver). In the
> VIP driver I don't use the control framework (there aren't controls), so 
> I think these lines must be there. Am I wrong?

Correct. But once sta2x11 is converted to using the control framework, then
these lines can be dropped since no one else is using this subdevice driver.

> I think you are thinking at the "Inheriting Controls" section of the 
> v4l2-controls.txt document. Right?

Right.

Regards,

	Hans

> 
> 
> > > -	ret = i2c_smbus_write_byte_data(client, ADV7180_HUE_REG,
> > > state->hue); +	ret = i2c_smbus_write_byte_data(client,
> > > ADV7180_HUE_REG,
> > > +					ADV7180_HUE_DEF);
> > 
> > It shouldn't be necessary to initialize the controls since
> > v4l2_ctrl_handler_setup does that for you already.
> 
> Removed
> 
> 
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