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>

diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index b39a58757907407ad191c3cf60a52d660c01588c..425cd4cf31fb8fca1fdff768f6f0fdf252e7cdd1 100644 (file)
--- 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,

diff --git a/include/linux/iio/types.h b/include/linux/iio/types.h
index a471fd5a4d9541d66c282fb66f0496cccfea3f1e..1b073b1cc7c2d30011efebfd7624dc2a13228716 100644 (file)
--- a/include/linux/iio/types.h
+++ b/include/linux/iio/types.h
@@ -50,5 +50,6 @@ enum iio_modifier {
 #define IIO_VAL_INT 1
 #define IIO_VAL_INT_PLUS_MICRO 2
 #define IIO_VAL_INT_PLUS_NANO 3
+#define IIO_VAL_INT_PLUS_MICRO_DB 4
 
 #endif /* _IIO_TYPES_H_ */