Re: [PATCH RFC 2/5] iio: adc: ad4030: add driver for ad4030-24

[Christophe JAILLET]

Le 27/06/2024 à 13:59, Esteban Blanc a écrit :
> This adds a new driver for the Analog Devices INC. AD4030-24 ADC.
>
> The driver implements basic support for the AD4030-24 1 channel
> differential ADC with hardware gain and offset control.
>
> Signed-off-by: Esteban Blanc <eblanc-rdvid1DuHRBWk0Htik3J/w@xxxxxxxxxxxxxxxx>
> ---

Hi,

a few nitpick below, should it help.

...

> +static int ad4030_read_avail(struct iio_dev *indio_dev,
> +			     struct iio_chan_spec const *channel,
> +			     const int **vals, int *type,
> +			     int *length, long mask)
> +{
> +	struct ad4030_state *st = iio_priv(indio_dev);
> +
> +	switch (mask) {
> +	case IIO_CHAN_INFO_CALIBBIAS:
> +		*vals = ad4030_get_offset_avail(st);
> +		*type = IIO_VAL_INT;
> +		return IIO_AVAIL_RANGE;
> +
> +	case IIO_CHAN_INFO_CALIBSCALE:
> +		*vals = (void *)ad4030_gain_avail;
> +		*type = IIO_VAL_INT_PLUS_MICRO;
> +		return IIO_AVAIL_RANGE;

Nitpick: in other switch below, there is a blank line before default:

> +	default:
> +		return -EINVAL;
> +	}
> +}

...

> +static int ad4030_regulators_get(struct ad4030_state *st)
> +{
> +	struct device *dev = &st->spi->dev;
> +	static const char * const ids[] = {"vdd-5v", "vdd-1v8"};
> +	int ret;
> +
> +	ret = devm_regulator_bulk_get_enable(dev, ARRAY_SIZE(ids), ids);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "Failed to enable regulators\n");
> +
> +	st->vio_uv = devm_regulator_get_enable_read_voltage(dev, "vio");
> +	if (st->vio_uv < 0)
> +		return dev_err_probe(dev, st->vio_uv,
> +				     "Failed to enable and read vio voltage");

Nitpick: missing \n

> +
> +	st->vref_uv = devm_regulator_get_enable_read_voltage(dev, "ref");
> +	if (st->vref_uv < 0) {
> +		if (st->vref_uv != -ENODEV)
> +			return dev_err_probe(dev, st->vref_uv,
> +					     "Failed to read vref voltage");

Nitpick: missing \n

> +
> +		/* if not using optional REF, the internal REFIN must be used */
> +		st->vref_uv = devm_regulator_get_enable_read_voltage(dev, "refin");
> +		if (st->vref_uv < 0)
> +			return dev_err_probe(dev, st->vref_uv,
> +					     "Failed to read vrefin voltage");

Nitpick: missing \n

> +	}
> +
> +	if (st->vref_uv < AD4030_VREF_MIN_UV || st->vref_uv > AD4030_VREF_MAX_UV)
> +		return dev_err_probe(dev, -EINVAL,
> +				     "vref(%d) must be in the range [%lu %lu]\n",
> +				     st->vref_uv, AD4030_VREF_MIN_UV,
> +				     AD4030_VREF_MAX_UV);
> +
> +	return 0;
> +}

...

> +static int ad4030_probe(struct spi_device *spi)
> +{
> +	struct device *dev = &spi->dev;
> +	struct iio_dev *indio_dev;
> +	struct ad4030_state *st;
> +	int ret;
> +
> +	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));

Nitpick: dev could be used. It is the same &spi->dev

> +	if (!indio_dev)
> +		return -ENOMEM;
> +
> +	st = iio_priv(indio_dev);
> +	st->spi = spi;
> +
> +	/* Make sure the SPI clock is within range to read register */
> +	st->conversion_speed_hz = spi->max_speed_hz;
> +	if (spi->max_speed_hz > AD4030_SPI_MAX_REG_XFER_SPEED)
> +		spi->max_speed_hz = AD4030_SPI_MAX_REG_XFER_SPEED;
> +
> +	st->regmap = devm_regmap_init(&spi->dev, &ad4030_regmap_bus, st,

Nitpick: dev could be used. It is the same &spi->dev

> +				      &ad4030_regmap_config);
> +	if (IS_ERR(st->regmap))
> +		dev_err_probe(&spi->dev, PTR_ERR(st->regmap),

Nitpick: dev could be used. It is the same &spi->dev

> +			      "Failed to initialize regmap\n");
> +
> +	st->chip = spi_get_device_match_data(spi);
> +	if (!st->chip)
> +		return -EINVAL;
> +
> +	ret = ad4030_regulators_get(st);
> +	if (ret)
> +		return ret;
> +
> +	ret = ad4030_reset(st);
> +	if (ret)
> +		return ret;
> +
> +	ret = ad4030_detect_chip_info(st);
> +	if (ret)
> +		return ret;
> +
> +	ret = ad4030_config(st);
> +	if (ret)
> +		return ret;
> +
> +	st->cnv_gpio = devm_gpiod_get(dev, "cnv", GPIOD_OUT_LOW);
> +	if (IS_ERR(st->cnv_gpio))
> +		return dev_err_probe(dev, PTR_ERR(st->cnv_gpio),
> +				     "Failed to get cnv gpio");

Nitpick: missing \n

> +
> +	indio_dev->name = st->chip->name;
> +	indio_dev->modes = INDIO_DIRECT_MODE;
> +	indio_dev->info = &ad4030_iio_info;
> +	indio_dev->channels = st->chip->channels;
> +	indio_dev->num_channels =  2 * st->chip->num_channels + 1;

Nitpick : 2 spaces after =

> +	indio_dev->available_scan_masks = st->chip->available_masks;
> +	indio_dev->masklength = st->chip->available_masks_len;
> +
> +	ret = devm_iio_triggered_buffer_setup(dev, indio_dev,
> +					      iio_pollfunc_store_time,
> +					      ad4030_trigger_handler,
> +					      &ad4030_buffer_setup_ops);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "Failed to setup triggered buffer\n");
> +
> +	return devm_iio_device_register(dev, indio_dev);
> +}

...

CJ