iio: core: introduce dB scle: IIO_VAL_INT_PLUS_MICRO_DB

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 13 insertions, 6 deletions

diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index b39a5875790..425cd4cf31f 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -295,26 +295,33 @@ static ssize_t iio_read_channel_info(struct device *dev,
         struct iio_dev *indio_dev = dev_get_drvdata(dev);
         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
         int val, val2;
+        bool scale_db = false;
         int ret = indio_dev->info->read_raw(indio_dev, this_attr->c,
                                             &val, &val2, this_attr->address);
 
         if (ret < 0)
                 return ret;
 
-        if (ret == IIO_VAL_INT)
+        switch (ret) {
+        case IIO_VAL_INT:
                 return sprintf(buf, "%d\n", val);
-        else if (ret == IIO_VAL_INT_PLUS_MICRO) {
+        case IIO_VAL_INT_PLUS_MICRO_DB:
+                scale_db = true;
+        case IIO_VAL_INT_PLUS_MICRO:
                 if (val2 < 0)
-                        return sprintf(buf, "-%d.%06u\n", val, -val2);
+                        return sprintf(buf, "-%d.%06u%s\n", val, -val2,
+                                scale_db ? " dB" : "");
                 else
-                        return sprintf(buf, "%d.%06u\n", val, val2);
-        } else if (ret == IIO_VAL_INT_PLUS_NANO) {
+                        return sprintf(buf, "%d.%06u%s\n", val, val2,
+                                scale_db ? " dB" : "");
+        case IIO_VAL_INT_PLUS_NANO:
                 if (val2 < 0)
                         return sprintf(buf, "-%d.%09u\n", val, -val2);
                 else
                         return sprintf(buf, "%d.%09u\n", val, val2);
-        } else
+        default:
                 return 0;
+        }
 }
 
 static ssize_t iio_write_channel_info(struct device *dev,