Date:	Mon, 20 Apr 2015 10:45:14 +0900
From:	Inha Song <ideal.song@...sung.com>
To:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
Cc:	mark.rutland@....com, devicetree@...r.kernel.org,
	alsa-devel@...a-project.org, pawel.moll@....com,
	ijc+devicetree@...lion.org.uk, rf@...nsource.wolfsonmicro.com,
	patches@...nsource.wolfsonmicro.com, linux-kernel@...r.kernel.org,
	robh+dt@...nel.org, cw00.choi@...sung.com, broonie@...nel.org,
	lee.jones@...aro.org
Subject: Re: [alsa-devel] [PATCH 1/2] extcon: arizona: Add support	for select
 accessory detect mode when headphone detection"

Hi,

Thanks for your comments,


On Fri, 17 Apr 2015 10:00:47 +0100
Charles Keepax <ckeepax@...nsource.wolfsonmicro.com> wrote:

> On Fri, Apr 17, 2015 at 05:32:58PM +0900, Inha Song wrote:
> > This patch add support for select accessory detect mode to HPDETL or HPDETR.
> > Arizona provides a headphone detection circuit on the HPDETL and HPDETR pins
> > to measure the impedance of an external load connected to the headphone.
> > 
> > Depending on board design, headphone detect pins can change to HPDETR or HPDETL.
> > 
> > Signed-off-by: Inha Song <ideal.song@...sung.com>
> > ---
> >  drivers/extcon/extcon-arizona.c   | 34 ++++++++++++++++++++++++++++++----
> >  include/linux/mfd/arizona/pdata.h |  3 +++
> >  2 files changed, 33 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/extcon/extcon-arizona.c b/drivers/extcon/extcon-arizona.c
> > index 63f01c4..7bc9159 100644
> > --- a/drivers/extcon/extcon-arizona.c
> > +++ b/drivers/extcon/extcon-arizona.c
> > @@ -95,6 +95,7 @@ struct arizona_extcon_info {
> >  	int jack_flips;
> >  
> >  	int hpdet_ip;
> > +	int hpdet_channel;
> 
> Don't really think this is necessary we can just use the pdata
> value where required doesn't add much copying it to extcon_info.
> 

OK,


> >  
> >  	struct extcon_dev *edev;
> >  };
> > @@ -653,9 +654,9 @@ static void arizona_identify_headphone(struct arizona_extcon_info *info)
> >  	ret = regmap_update_bits(arizona->regmap,
> >  				 ARIZONA_ACCESSORY_DETECT_MODE_1,
> >  				 ARIZONA_ACCDET_MODE_MASK,
> > -				 ARIZONA_ACCDET_MODE_HPL);
> > +				 info->hpdet_channel);
> >  	if (ret != 0) {
> > -		dev_err(arizona->dev, "Failed to set HPDETL mode: %d\n", ret);
> > +		dev_err(arizona->dev, "Failed to set HPDET mode: %d\n", ret);
> >  		goto err;
> >  	}
> >  
> > @@ -705,9 +706,9 @@ static void arizona_start_hpdet_acc_id(struct arizona_extcon_info *info)
> >  				 ARIZONA_ACCESSORY_DETECT_MODE_1,
> >  				 ARIZONA_ACCDET_SRC | ARIZONA_ACCDET_MODE_MASK,
> >  				 info->micd_modes[0].src |
> > -				 ARIZONA_ACCDET_MODE_HPL);
> > +				 info->hpdet_channel);
> >  	if (ret != 0) {
> > -		dev_err(arizona->dev, "Failed to set HPDETL mode: %d\n", ret);
> > +		dev_err(arizona->dev, "Failed to set HPDET mode: %d\n", ret);
> >  		goto err;
> >  	}
> >  
> > @@ -1103,6 +1104,23 @@ static void arizona_micd_set_level(struct arizona *arizona, int index,
> >  	regmap_update_bits(arizona->regmap, reg, mask, level);
> >  }
> >  
> > +#ifdef CONFIG_OF
> > +static int arizona_of_get_extcon_pdata(struct arizona *arizona)
> > +{
> > +	struct arizona_pdata *pdata = &arizona->pdata;
> > +
> > +	of_property_read_u32(arizona->dev->of_node, "wlf,hpdet-channel",
> > +			     &pdata->hpdet_channel);
> > +
> > +	return 0;
> > +}
> > +#else
> > +static inline int arizona_of_get_extcon_pdata(struct arizona *arizona)
> > +{
> > +	return 0;
> > +}
> > +#endif
> > +
> 
> I believe it is preferred to leave this as not ifdef'ed...
> 
> >  static int arizona_extcon_probe(struct platform_device *pdev)
> >  {
> >  	struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
> > @@ -1120,6 +1138,9 @@ static int arizona_extcon_probe(struct platform_device *pdev)
> >  	if (!info)
> >  		return -ENOMEM;
> >  
> > +	if (!dev_get_platdata(arizona->dev))
> > +		arizona_of_get_extcon_pdata(arizona);
> 
> And to wrap this in an if (IS_ENABLED(CONFIG_OF)).

OK, I will fix. And I will also change to arizona_extcon_of_get_pdata().

> 
> > +
> >  	info->micvdd = devm_regulator_get(&pdev->dev, "MICVDD");
> >  	if (IS_ERR(info->micvdd)) {
> >  		ret = PTR_ERR(info->micvdd);
> > @@ -1338,6 +1359,11 @@ static int arizona_extcon_probe(struct platform_device *pdev)
> >  
> >  	arizona_extcon_set_mode(info, 0);
> >  
> > +	if (arizona->pdata.hpdet_channel)
> > +		info->hpdet_channel = ARIZONA_ACCDET_MODE_HPR;
> > +	else
> > +		info->hpdet_channel = ARIZONA_ACCDET_MODE_HPL;
> > +
> 
> Just move the two defines in include/dt-bindings/mfd/arizona.h
> and have the pdata get set directly to one of the values.

Ok, I agree. But I have a question.
Should I also move ACCDET_MODE_MIC define to dt-bindings header?

> 
> >  	pm_runtime_enable(&pdev->dev);
> >  	pm_runtime_idle(&pdev->dev);
> >  	pm_runtime_get_sync(&pdev->dev);
> > diff --git a/include/linux/mfd/arizona/pdata.h b/include/linux/mfd/arizona/pdata.h
> > index 4578c72..feb5903 100644
> > --- a/include/linux/mfd/arizona/pdata.h
> > +++ b/include/linux/mfd/arizona/pdata.h
> > @@ -139,6 +139,9 @@ struct arizona_pdata {
> >  	/** GPIO used for mic isolation with HPDET */
> >  	int hpdet_id_gpio;
> >  
> > +	/** Channel to use for headphone detection */
> > +	int hpdet_channel;
> 
> Lets use and unsigned here, we don't need it to be signed and it
> saves type issues with read_u32.

OK,

Best Regards,
Inha Song.

> 
> > +
> >  	/** Extra debounce timeout used during initial mic detection (ms) */
> >  	int micd_detect_debounce;
> >  
> > -- 
> > 2.0.0.390.gcb682f8
> > 
> 
> Thanks,
> Charles
> _______________________________________________
> Alsa-devel mailing list
> Alsa-devel@...a-project.org
> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
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