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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>
hifive-unleashed-5.1
Michael Hennerich 2012-05-11 11:36:52 +02:00 committed by Greg Kroah-Hartman
parent 49b81a3c74
commit 67eedba39e
2 changed files with 14 additions and 6 deletions
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19
drivers/iio/industrialio-core.c
View File

@ -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,

1
include/linux/iio/types.h
View File

@ -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_ */