linux-kernel - Re: [PATCH v4 6/7] iio: light: vcnl4000: Add oversampling

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Date:   Mon, 29 May 2023 08:22:41 +0300
From:   andy.shevchenko@...il.com
To:     Astrid Rost <astrid.rost@...s.com>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel@...s.com,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Mathieu Othacehe <m.othacehe@...il.com>
Subject: Re: [PATCH v4 6/7] iio: light: vcnl4000: Add oversampling_ratio for
 4040/4200

Mon, May 22, 2023 at 04:26:20PM +0200, Astrid Rost kirjoitti:
> Add the proximity multi pulse (PS_MPS) as oversampling_ratio.
> Instead of one single pulse per every defined time frame,
> one can program 2, 4, or even 8 pulses. This leads to a
> longer IRED on-time for each proximity measurement value, which
> also results in a higher detection range.
> 
> Add read/write attribute for proximity oversampling-ratio and read
> attribute for available oversampling-ratio.
> This is supported for vcnl4040 and vcnl4200.

...

> +static ssize_t vcnl4040_write_ps_oversampling_ratio(struct vcnl4000_data *data, int val)
> +{
> +	unsigned int i;
> +	int ret, index = -1;

Either i or index is redundant.

> +	u16 regval;
> +
> +	for (i = 0; i < ARRAY_SIZE(vcnl4040_ps_oversampling_ratio); i++) {
> +		if (val == vcnl4040_ps_oversampling_ratio[i]) {
> +			index = i;
> +			break;
> +		}
> +	}
> +
> +	if (index < 0)
> +		return -EINVAL;
> +
> +	mutex_lock(&data->vcnl4000_lock);
> +
> +	ret = i2c_smbus_read_word_data(data->client, VCNL4200_PS_CONF3);
> +	if (ret < 0)
> +		goto out;
> +
> +	regval = (ret & ~VCNL4040_PS_CONF3_MPS) |
> +	    FIELD_PREP(VCNL4040_PS_CONF3_MPS, index);
> +	ret = i2c_smbus_write_word_data(data->client, VCNL4200_PS_CONF3,
> +					regval);
> +
> +out:

out_unlock:

> +	mutex_unlock(&data->vcnl4000_lock);
> +	return ret;
> +}

...

>  		if (ret < 0)
>  			return ret;
>  		return IIO_VAL_INT_PLUS_MICRO;
> +	case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
> +		switch (chan->type) {
> +		case IIO_PROXIMITY:
> +			ret = vcnl4040_read_ps_oversampling_ratio(data, val);
> +			if (ret < 0)
> +				return ret;
> +			return IIO_VAL_INT;
> +		default:
> +			return -EINVAL;
> +		}

> +

This is inconsistent blank line.

>  	default:
>  		return -EINVAL;
>  	}

-- 
With Best Regards,
Andy Shevchenko