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SubjectRe: [PATCH] staging: iio: adc: ad7192: Use read_avail for available attributes
On Tue, 19 Mar 2019 16:25:20 +0200
Mircea Caprioru <mircea.caprioru@analog.com> wrote:

> This patch removes the in_voltage-voltage_scale_available and
> in_voltage_scale_available attributes. These are replaced with available
> attributes added in info_mask_shared_by_type_available.
>
> With this modification the iio core will be responsible with naming the
> attributes thus removing the checkpatch warning related to
> in_voltage-voltage_scale_available naming.
>
> Signed-off-by: Mircea Caprioru <mircea.caprioru@analog.com>

Thanks for sorting this out! Many future newbies will avoid the
trap this set a a result of this ;)

There is a lot of code in here just to tweak whether the scale available bit
is set or not.

Hmm. Lets do this for now, but we may need to have a a think about whether
to adjust the ad_ core to deal with it at some point.

Applied to the togreg branch of iio.git and pushed out as testing for
the autobuilders to play with it.

thanks,

Jonathan

> ---
> drivers/staging/iio/adc/ad7192.c | 99 ++++++++++++++++++++------------
> 1 file changed, 61 insertions(+), 38 deletions(-)
>
> diff --git a/drivers/staging/iio/adc/ad7192.c b/drivers/staging/iio/adc/ad7192.c
> index acdbc07fd259..d8a20f9066f4 100644
> --- a/drivers/staging/iio/adc/ad7192.c
> +++ b/drivers/staging/iio/adc/ad7192.c
> @@ -337,30 +337,6 @@ static int ad7192_setup(struct ad7192_state *st,
> return ret;
> }
>
> -static ssize_t
> -ad7192_show_scale_available(struct device *dev,
> - struct device_attribute *attr, char *buf)
> -{
> - struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> - struct ad7192_state *st = iio_priv(indio_dev);
> - int i, len = 0;
> -
> - for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++)
> - len += sprintf(buf + len, "%d.%09u ", st->scale_avail[i][0],
> - st->scale_avail[i][1]);
> -
> - len += sprintf(buf + len, "\n");
> -
> - return len;
> -}
> -
> -static IIO_DEVICE_ATTR_NAMED(in_v_m_v_scale_available,
> - in_voltage-voltage_scale_available,
> - 0444, ad7192_show_scale_available, NULL, 0);
> -
> -static IIO_DEVICE_ATTR(in_voltage_scale_available, 0444,
> - ad7192_show_scale_available, NULL, 0);
> -
> static ssize_t ad7192_show_ac_excitation(struct device *dev,
> struct device_attribute *attr,
> char *buf)
> @@ -435,8 +411,6 @@ static IIO_DEVICE_ATTR(ac_excitation_en, 0644,
> AD7192_REG_MODE);
>
> static struct attribute *ad7192_attributes[] = {
> - &iio_dev_attr_in_v_m_v_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage_scale_available.dev_attr.attr,
> &iio_dev_attr_bridge_switch_en.dev_attr.attr,
> &iio_dev_attr_ac_excitation_en.dev_attr.attr,
> NULL
> @@ -447,8 +421,6 @@ static const struct attribute_group ad7192_attribute_group = {
> };
>
> static struct attribute *ad7195_attributes[] = {
> - &iio_dev_attr_in_v_m_v_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage_scale_available.dev_attr.attr,
> &iio_dev_attr_bridge_switch_en.dev_attr.attr,
> NULL
> };
> @@ -579,10 +551,31 @@ static int ad7192_write_raw_get_fmt(struct iio_dev *indio_dev,
> }
> }
>
> +static int ad7192_read_avail(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan,
> + const int **vals, int *type, int *length,
> + long mask)
> +{
> + struct ad7192_state *st = iio_priv(indio_dev);
> +
> + switch (mask) {
> + case IIO_CHAN_INFO_SCALE:
> + *vals = (int *)st->scale_avail;
> + *type = IIO_VAL_INT_PLUS_NANO;
> + /* Values are stored in a 2D matrix */
> + *length = ARRAY_SIZE(st->scale_avail) * 2;
> +
> + return IIO_AVAIL_LIST;
> + }
> +
> + return -EINVAL;
> +}
> +
> static const struct iio_info ad7192_info = {
> .read_raw = ad7192_read_raw,
> .write_raw = ad7192_write_raw,
> .write_raw_get_fmt = ad7192_write_raw_get_fmt,
> + .read_avail = ad7192_read_avail,
> .attrs = &ad7192_attribute_group,
> .validate_trigger = ad_sd_validate_trigger,
> };
> @@ -591,6 +584,7 @@ static const struct iio_info ad7195_info = {
> .read_raw = ad7192_read_raw,
> .write_raw = ad7192_write_raw,
> .write_raw_get_fmt = ad7192_write_raw_get_fmt,
> + .read_avail = ad7192_read_avail,
> .attrs = &ad7195_attribute_group,
> .validate_trigger = ad_sd_validate_trigger,
> };
> @@ -625,6 +619,42 @@ static const struct iio_chan_spec ad7193_channels[] = {
> IIO_CHAN_SOFT_TIMESTAMP(14),
> };
>
> +static int ad7192_channels_config(struct iio_dev *indio_dev)
> +{
> + struct ad7192_state *st = iio_priv(indio_dev);
> + const struct iio_chan_spec *channels;
> + struct iio_chan_spec *chan;
> + int i;
> +
> + switch (st->devid) {
> + case ID_AD7193:
> + channels = ad7193_channels;
> + indio_dev->num_channels = ARRAY_SIZE(ad7193_channels);
> + break;
> + default:
> + channels = ad7192_channels;
> + indio_dev->num_channels = ARRAY_SIZE(ad7192_channels);
> + break;
> + }
> +
> + chan = devm_kcalloc(indio_dev->dev.parent, indio_dev->num_channels,
> + sizeof(*chan), GFP_KERNEL);
> + if (!chan)
> + return -ENOMEM;
> +
> + indio_dev->channels = chan;
> +
> + for (i = 0; i < indio_dev->num_channels; i++) {
> + *chan = channels[i];
> + if (chan->type != IIO_TEMP)
> + chan->info_mask_shared_by_type_available |=
> + BIT(IIO_CHAN_INFO_SCALE);
> + chan++;
> + }
> +
> + return 0;
> +}
> +
> static int ad7192_probe(struct spi_device *spi)
> {
> const struct ad7192_platform_data *pdata = dev_get_platdata(&spi->dev);
> @@ -687,16 +717,9 @@ static int ad7192_probe(struct spi_device *spi)
> indio_dev->name = spi_get_device_id(spi)->name;
> indio_dev->modes = INDIO_DIRECT_MODE;
>
> - switch (st->devid) {
> - case ID_AD7193:
> - indio_dev->channels = ad7193_channels;
> - indio_dev->num_channels = ARRAY_SIZE(ad7193_channels);
> - break;
> - default:
> - indio_dev->channels = ad7192_channels;
> - indio_dev->num_channels = ARRAY_SIZE(ad7192_channels);
> - break;
> - }
> + ret = ad7192_channels_config(indio_dev);
> + if (ret < 0)
> + goto error_disable_dvdd;
>
> if (st->devid == ID_AD7195)
> indio_dev->info = &ad7195_info;

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