linux-kernel - Re: [PATCH v1 1/2] iio: mtk-auxadc: add support IIO_CHAN_INFO

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Date:   Thu, 12 Aug 2021 19:07:25 +0100
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     Hui Liu <hui.liu@...iatek.com>
CC:     <robh+dt@...nel.org>, <jic23@...nel.org>, <lars@...afoo.de>,
        <pmeerw@...erw.net>, <srv_heupstream@...iatek.com>,
        <zhiyong.tao@...iatek.com>, <chun-hung.wu@...iatek.com>,
        <yingjoe.chen@...iatek.com>, <seiya.wang@...iatek.com>,
        <matthias.bgg@...il.com>, <s.hauer@...gutronix.de>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-iio@...r.kernel.org>, <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v1 1/2] iio: mtk-auxadc: add support IIO_CHAN_INFO_RAW
 case

On Thu, 12 Aug 2021 13:48:43 +0800
Hui Liu <hui.liu@...iatek.com> wrote:

> Add support IIO_CHAN_INFO_RAW case.
Why?

We almost never support both RAW and PROCESSED as userspace should be
fine to use either.  There are a few reasons we've let drivers do
this but I would like know why it matters to you and it definitely
needs to be in the patch description.

> 
> Signed-off-by: Hui Liu <hui.liu@...iatek.com>
> ---
>  drivers/iio/adc/mt6577_auxadc.c | 16 +++++++++++++++-
>  1 file changed, 15 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/iio/adc/mt6577_auxadc.c b/drivers/iio/adc/mt6577_auxadc.c
> index 79c1dd68b909..e995d43287b2 100644
> --- a/drivers/iio/adc/mt6577_auxadc.c
> +++ b/drivers/iio/adc/mt6577_auxadc.c
> @@ -60,7 +60,8 @@ static const struct mtk_auxadc_compatible mt6765_compat = {
>  		.type = IIO_VOLTAGE,				    \
>  		.indexed = 1,					    \
>  		.channel = (idx),				    \
> -		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \
> +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |	    \
> +				      BIT(IIO_CHAN_INFO_PROCESSED), \
>  }
>  
>  static const struct iio_chan_spec mt6577_auxadc_iio_channels[] = {
> @@ -181,6 +182,19 @@ static int mt6577_auxadc_read_raw(struct iio_dev *indio_dev,
>  	struct mt6577_auxadc_device *adc_dev = iio_priv(indio_dev);
>  
>  	switch (info) {
> +	case IIO_CHAN_INFO_RAW:
> +		*val = mt6577_auxadc_read(indio_dev, chan);
> +		if (*val < 0) {
> +			dev_notice(indio_dev->dev.parent,
> +				"failed to sample data on channel[%d]\n",
> +				chan->channel);
> +			return *val;
> +		}
> +		if (adc_dev->dev_comp->sample_data_cali)
> +			*val = mt_auxadc_get_cali_data(*val, true);
> +
> +		return IIO_VAL_INT;
> +
>  	case IIO_CHAN_INFO_PROCESSED:
>  		*val = mt6577_auxadc_read(indio_dev, chan);
>  		if (*val < 0) {