Commit 7eb6b35d authored by Alexandru Ardelean's avatar Alexandru Ardelean Committed by Jonathan Cameron

iio: adc: ad7791: remove sample freq sysfs attributes

In the current state, these attributes are broken, because they are
registered already, and the kernel throws a warning.
The first registration happens via the `IIO_CHAN_INFO_SAMP_FREQ` flag from
the `ad_sigma_delta` driver.

In this commit these attrs are removed, and in the following the
IIO_CHAN_INFO_SAMP_FREQ behavior will be implemented, which replaces these

This is done to make things a bit easier to review as there is a bit of
overlap in the patch if it's done all at once.

Fixes: a13e831f ("staging: iio: ad7192: implement IIO_CHAN_INFO_SAMP_FREQ")
Signed-off-by: default avatarAlexandru Ardelean <>
Cc: <>
Signed-off-by: default avatarJonathan Cameron <>
parent 5a0b8cb4
......@@ -244,58 +244,9 @@ static int ad7791_read_raw(struct iio_dev *indio_dev,
return -EINVAL;
static const char * const ad7791_sample_freq_avail[] = {
[AD7791_FILTER_RATE_120] = "120",
[AD7791_FILTER_RATE_100] = "100",
[AD7791_FILTER_RATE_33_3] = "33.3",
[AD7791_FILTER_RATE_20] = "20",
[AD7791_FILTER_RATE_16_6] = "16.6",
[AD7791_FILTER_RATE_16_7] = "16.7",
[AD7791_FILTER_RATE_13_3] = "13.3",
[AD7791_FILTER_RATE_9_5] = "9.5",
static ssize_t ad7791_read_frequency(struct device *dev,
struct device_attribute *attr, char *buf)
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct ad7791_state *st = iio_priv(indio_dev);
unsigned int rate = st->filter & AD7791_FILTER_RATE_MASK;
return sprintf(buf, "%s\n", ad7791_sample_freq_avail[rate]);
static ssize_t ad7791_write_frequency(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct ad7791_state *st = iio_priv(indio_dev);
int i, ret;
i = sysfs_match_string(ad7791_sample_freq_avail, buf);
if (i < 0)
return i;
ret = iio_device_claim_direct_mode(indio_dev);
if (ret)
return ret;
st->filter &= ~AD7791_FILTER_RATE_MASK;
st->filter |= i;
ad_sd_write_reg(&st->sd, AD7791_REG_FILTER, sizeof(st->filter),
return len;
static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("120 100 33.3 20 16.7 16.6 13.3 9.5");
static struct attribute *ad7791_attributes[] = {
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