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SubjectRe: [PATCH V6 7/7] iio: adc: Add a common read function for PMIC5 and PMIC7
On Thu, 28 May 2020 22:24:29 +0530
Jishnu Prakash <jprakash@codeaurora.org> wrote:

> Add a common function used for read_raw callback for both PMIC5
> and PMIC7 ADCs.
>
> Signed-off-by: Jishnu Prakash <jprakash@codeaurora.org>

Hmm. I'm not completely sold on this one. Suggestions below.

Jonathan


> ---
> drivers/iio/adc/qcom-spmi-adc5.c | 53 +++++++++++++++++++---------------------
> 1 file changed, 25 insertions(+), 28 deletions(-)
>
> diff --git a/drivers/iio/adc/qcom-spmi-adc5.c b/drivers/iio/adc/qcom-spmi-adc5.c
> index 0f9af66..fe49741 100644
> --- a/drivers/iio/adc/qcom-spmi-adc5.c
> +++ b/drivers/iio/adc/qcom-spmi-adc5.c
> @@ -449,6 +449,13 @@ static int adc7_do_conversion(struct adc5_chip *adc,
> return ret;
> }
>
> +struct adc_do_conversion {
> + int (*adc_do_conversion)(struct adc5_chip *adc,
> + struct adc5_channel_prop *prop,
> + struct iio_chan_spec const *chan,
> + u16 *data_volt, u16 *data_cur);

Why use a structure for this? It's just a function pointer.
If they form is too long you can always use a typedef.

This is fine if you have other stuff coming shortly that will add
to this structure but for now it's just a bit confusing.

Directly passing the function pointer will reduce the amount
of coded added here and make the argument in favour of refactoring
rather stronger.


> +};
> +
> static irqreturn_t adc5_isr(int irq, void *dev_id)
> {
> struct adc5_chip *adc = dev_id;
> @@ -487,9 +494,9 @@ static int adc7_of_xlate(struct iio_dev *indio_dev,
> return -EINVAL;
> }
>
> -static int adc5_read_raw(struct iio_dev *indio_dev,
> +static int adc_read_raw_common(struct iio_dev *indio_dev,
> struct iio_chan_spec const *chan, int *val, int *val2,
> - long mask)
> + long mask, struct adc_do_conversion do_conv)
> {
> struct adc5_chip *adc = iio_priv(indio_dev);
> struct adc5_channel_prop *prop;
> @@ -500,8 +507,8 @@ static int adc5_read_raw(struct iio_dev *indio_dev,
>
> switch (mask) {
> case IIO_CHAN_INFO_PROCESSED:
> - ret = adc5_do_conversion(adc, prop, chan,
> - &adc_code_volt, &adc_code_cur);
> + ret = do_conv.adc_do_conversion(adc, prop, chan,
> + &adc_code_volt, &adc_code_cur);
> if (ret)
> return ret;
>
> @@ -518,36 +525,26 @@ static int adc5_read_raw(struct iio_dev *indio_dev,
> }
> }
>
> -static int adc7_read_raw(struct iio_dev *indio_dev,
> +static int adc5_read_raw(struct iio_dev *indio_dev,
> struct iio_chan_spec const *chan, int *val, int *val2,
> long mask)
> {
> - struct adc5_chip *adc = iio_priv(indio_dev);
> - struct adc5_channel_prop *prop;
> - u16 adc_code_volt, adc_code_cur;
> - int ret;
> -
> - prop = &adc->chan_props[chan->address];
> -
> - switch (mask) {
> - case IIO_CHAN_INFO_PROCESSED:
> - ret = adc7_do_conversion(adc, prop, chan,
> - &adc_code_volt, &adc_code_cur);
> - if (ret)
> - return ret;
> + struct adc_do_conversion do_conv;
>
> - ret = qcom_adc5_hw_scale(prop->scale_fn_type,
> - &adc5_prescale_ratios[prop->prescale],
> - adc->data,
> - adc_code_volt, val);
> + do_conv.adc_do_conversion = adc5_do_conversion;
> + return adc_read_raw_common(indio_dev, chan, val, val2,
> + mask, do_conv);
> +}
>
> - if (ret)
> - return ret;
> +static int adc7_read_raw(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan, int *val, int *val2,
> + long mask)
> +{
> + struct adc_do_conversion do_conv;
>
> - return IIO_VAL_INT;
> - default:
> - return -EINVAL;
> - }
> + do_conv.adc_do_conversion = adc7_do_conversion;
> + return adc_read_raw_common(indio_dev, chan, val, val2,
> + mask, do_conv);
> }
>
> static const struct iio_info adc5_info = {

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