On Thu, 15 Jun 2023 17:26:28 +0200 Herve Codina herve.codina@bootlin.com wrote:
A helper, iio_read_max_channel_raw() exists to read the available maximum raw value of a channel but nothing similar exists to read the available minimum raw value.
This new helper, iio_read_min_channel_raw(), fills the hole and can be used for reading the available minimum raw value of a channel. It is fully based on the existing iio_read_max_channel_raw().
Signed-off-by: Herve Codina herve.codina@bootlin.com Reviewed-by: Andy Shevchenko andy.shevchenko@gmail.com
LGTM Acked-by: Jonathan Cameron Jonathan.Cameron@huawei.com
drivers/iio/inkern.c | 63 ++++++++++++++++++++++++++++++++++++ include/linux/iio/consumer.h | 12 +++++++ 2 files changed, 75 insertions(+)
diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c index 19ddd77adb11..7a1f6713318a 100644 --- a/drivers/iio/inkern.c +++ b/drivers/iio/inkern.c @@ -909,6 +909,69 @@ int iio_read_max_channel_raw(struct iio_channel *chan, int *val) } EXPORT_SYMBOL_GPL(iio_read_max_channel_raw);
+static int iio_channel_read_min(struct iio_channel *chan,
int *val, int *val2, int *type,enum iio_chan_info_enum info)+{
- const int *vals;
- int length;
- int ret;
- ret = iio_channel_read_avail(chan, &vals, type, &length, info);
- if (ret < 0)
return ret;- switch (ret) {
- case IIO_AVAIL_RANGE:
switch (*type) {case IIO_VAL_INT:*val = vals[0];break;default:*val = vals[0];if (val2)*val2 = vals[1];}return 0;- case IIO_AVAIL_LIST:
if (length <= 0)return -EINVAL;switch (*type) {case IIO_VAL_INT:*val = min_array(vals, length);break;default:/* TODO: learn about min for other iio values */return -EINVAL;}return 0;- default:
return -EINVAL;- }
+}
+int iio_read_min_channel_raw(struct iio_channel *chan, int *val) +{
- struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(chan->indio_dev);
- int ret;
- int type;
- mutex_lock(&iio_dev_opaque->info_exist_lock);
- if (!chan->indio_dev->info) {
ret = -ENODEV;goto err_unlock;- }
- ret = iio_channel_read_min(chan, val, NULL, &type, IIO_CHAN_INFO_RAW);
+err_unlock:
- mutex_unlock(&iio_dev_opaque->info_exist_lock);
- return ret;
+} +EXPORT_SYMBOL_GPL(iio_read_min_channel_raw);
int iio_get_channel_type(struct iio_channel *chan, enum iio_chan_type *type) { struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(chan->indio_dev); diff --git a/include/linux/iio/consumer.h b/include/linux/iio/consumer.h index f536820b9cf2..e9910b41d48e 100644 --- a/include/linux/iio/consumer.h +++ b/include/linux/iio/consumer.h @@ -301,6 +301,18 @@ int iio_write_channel_raw(struct iio_channel *chan, int val); */ int iio_read_max_channel_raw(struct iio_channel *chan, int *val);
+/**
- iio_read_min_channel_raw() - read minimum available raw value from a given
channel, i.e. the minimum possible value.
- @chan: The channel being queried.
- @val: Value read back.
- Note, if standard units are required, raw reads from iio channels
- need the offset (default 0) and scale (default 1) to be applied
- as (raw + offset) * scale.
- */
+int iio_read_min_channel_raw(struct iio_channel *chan, int *val);
/**
- iio_read_avail_channel_raw() - read available raw values from a given channel
- @chan: The channel being queried.