linux-kernel - Re: [PATCH] iio: adc: mt6370: Fix ibus and ibat scaling value of some specific vendor ID chips

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Message-ID: <20230326165604.27338cc6@jic23-huawei>
Date:   Sun, 26 Mar 2023 16:56:04 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     ChiaEn Wu <chiaen_wu@...htek.com>
Cc:     <lars@...afoo.de>, <matthias.bgg@...il.com>,
        <angelogioacchino.delregno@...labora.com>,
        <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <peterwu.pub@...il.com>,
        <cy_huang@...htek.com>
Subject: Re: [PATCH] iio: adc: mt6370: Fix ibus and ibat scaling value of
 some specific vendor ID chips

On Fri, 24 Mar 2023 22:12:47 +0800
ChiaEn Wu <chiaen_wu@...htek.com> wrote:

> The scale value of ibus and ibat on the datasheet is incorrect due to the
> customer report after the experimentation with some specific vendor ID
> chips.
> 
> Signed-off-by: ChiaEn Wu <chiaen_wu@...htek.com>

Hi. Only significant issue here is the one the build bot found.
A few other trivial formatting suggestions inline.

Thanks,

Jonathan


>  
>  static int mt6370_adc_read_channel(struct mt6370_adc_data *priv, int chan,
> @@ -98,6 +105,26 @@ static int mt6370_adc_read_channel(struct mt6370_adc_data *priv, int chan,
>  	return ret;
>  }
>  
> +static int mt6370_adc_get_ibus_scale(struct mt6370_adc_data *priv)
> +{
> +	if (priv->vid == MT6370_VID_RT5081  ||
> +	    priv->vid == MT6370_VID_RT5081A ||
> +	    priv->vid == MT6370_VID_MT6370)
> +		return 3350;
> +	else

I'd drop the else.  We are special casing the matches above, so it makes sense
for them to be out of line.  The 'normal' case doesn't need to be indented.

> +		return 3875;
> +}
> +
> +static int mt6370_adc_get_ibat_scale(struct mt6370_adc_data *priv)
> +{
> +	if (priv->vid == MT6370_VID_RT5081  ||
> +	    priv->vid == MT6370_VID_RT5081A ||
> +	    priv->vid == MT6370_VID_MT6370)
> +		return 2680;
> +	else
> +		return 3870;
> +}
> +
>  static int mt6370_adc_read_scale(struct mt6370_adc_data *priv,
>  				 int chan, int *val1, int *val2)
>  {
> @@ -123,7 +150,7 @@ static int mt6370_adc_read_scale(struct mt6370_adc_data *priv,
>  		case MT6370_AICR_250_mA:
>  		case MT6370_AICR_300_mA:
>  		case MT6370_AICR_350_mA:
> -			*val1 = 3350;
> +			*val1 = mt6370_adc_get_ibus_scale(priv);
>  			break;
>  		default:
>  			*val1 = 5000;
> @@ -150,7 +177,7 @@ static int mt6370_adc_read_scale(struct mt6370_adc_data *priv,
>  		case MT6370_ICHG_600_mA:
>  		case MT6370_ICHG_700_mA:
>  		case MT6370_ICHG_800_mA:
> -			*val1 = 2680;
> +			*val1 = mt6370_adc_get_ibat_scale(priv);
>  			break;
>  		default:
>  			*val1 = 5000;
> @@ -251,6 +278,19 @@ static const struct iio_chan_spec mt6370_adc_channels[] = {
>  	MT6370_ADC_CHAN(TEMP_JC, IIO_TEMP, 12, BIT(IIO_CHAN_INFO_OFFSET)),
>  };
>  
> +static int mt6370_get_vendor_info(struct mt6370_adc_data *priv)
> +{
> +	unsigned int dev_info;
> +	int ret;
> +
> +	ret = regmap_read(priv->regmap, MT6370_REG_DEV_INFO, &dev_info);
> +	if (ret)
> +		return ret;
> +
> +	priv->vid = FIELD_GET(MT6370_VENID_MASK, dev_info);

Blank line preferred before a simple return like this.  Makes the code a tiny
bit more readable.

> +	return 0;
> +}
> +
>  static int mt6370_adc_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
> @@ -263,6 +303,10 @@ static int mt6370_adc_probe(struct platform_device *pdev)
>  	if (!regmap)
>  		return dev_err_probe(dev, -ENODEV, "Failed to get regmap\n");
>  
> +	ret = mt6370_get_vendor_info(priv);

The build bot spotted this one.  Can't use priv yet as it doesn't exist
for a few more lines.

> +	if (ret)
> +		return dev_err_probe(dev, ret, "Failed to get vid\n");
> +
>  	indio_dev = devm_iio_device_alloc(dev, sizeof(*priv));
>  	if (!indio_dev)
>  		return -ENOMEM;