[PATCH 3/6] iio:pressure:ms5637: limit available sample frequencies

Alexandre Belloni
2020-12-09T23:51:32Z

Avoid exposing all the sampling frequencies for chip that only support a
subset.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
---
drivers/iio/pressure/ms5637.c | 19 +++++++++++++++----
1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/drivers/iio/pressure/ms5637.c b/drivers/iio/pressure/ms5637.c
index 351bfdb24fb4..2943b88734b3 100644
--- a/drivers/iio/pressure/ms5637.c
+++ b/drivers/iio/pressure/ms5637.c
@@ -36,8 +36,19 @@ struct ms_tp_data {
};

static const int ms5637_samp_freq[6] = { 960, 480, 240, 120, 60, 30 };
-/* String copy of the above const for readability purpose */
-static const char ms5637_show_samp_freq[] = "960 480 240 120 60 30";
+
+static ssize_t ms5637_show_samp_freq(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct ms_tp_dev *dev_data = iio_priv(indio_dev);
+ int i, len = 0;
+
+ for (i = 0; i <= dev_data->hw->max_res_index; i++)
+ len += scnprintf(buf + len, PAGE_SIZE - len, "%u ", ms5637_samp_freq[i]);
+ buf[len - 1] = '\n';
+
+ return len;
+}

static int ms5637_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *channel, int *val,
@@ -114,10 +125,10 @@ static const struct iio_chan_spec ms5637_channels[] = {
}
};

-static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(ms5637_show_samp_freq);
+static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(ms5637_show_samp_freq);

static struct attribute *ms5637_attributes[] = {
- &iio_const_attr_sampling_frequency_available.dev_attr.attr,
+ &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
NULL,
};

--
2.28.0