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| author | Lars-Peter Clausen <lars@metafoo.de> | 2012-10-16 17:29:00 +0100 |
|---|---|---|
| committer | Jonathan Cameron <jic23@kernel.org> | 2012-10-19 18:46:51 +0100 |
| commit | 103d9fb907058e4eb052f4f7302d1b07eb6a7792 (patch) | |
| tree | 8ab834da14137f068195eb30660ffdd19f41acdd | |
| parent | 948ad20504894436c008c8a50f74e277edeff9a1 (diff) | |
| download | linux-103d9fb907058e4eb052f4f7302d1b07eb6a7792.tar.gz linux-103d9fb907058e4eb052f4f7302d1b07eb6a7792.tar.bz2 linux-103d9fb907058e4eb052f4f7302d1b07eb6a7792.zip | |
iio: Add a logarithmic fractional value type
For ADCs or DACs the denominator for fractional types often is a power of two.
In this case we can use a shift operation instead of the rather expensive 64 bit
division. This patch adds a new fractional type which expects the denominator to
be specified as the log2 of the actual denominator. E.g. for ADCs and DACs this
will usually be the number of significant bits.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
| -rw-r--r-- | drivers/iio/industrialio-core.c | 5 | ||||
| -rw-r--r-- | drivers/iio/inkern.c | 3 | ||||
| -rw-r--r-- | include/linux/iio/types.h | 1 |
3 files changed, 9 insertions, 0 deletions
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c index 6eb24dbc081e..37650a72b31f 100644 --- a/drivers/iio/industrialio-core.c +++ b/drivers/iio/industrialio-core.c @@ -397,6 +397,11 @@ static ssize_t iio_read_channel_info(struct device *dev, val2 = do_div(tmp, 1000000000LL); val = tmp; return sprintf(buf, "%d.%09u\n", val, val2); + case IIO_VAL_FRACTIONAL_LOG2: + tmp = (s64)val * 1000000000LL >> val2; + val2 = do_div(tmp, 1000000000LL); + val = tmp; + return sprintf(buf, "%d.%09u\n", val, val2); default: return 0; } diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c index 5230a33886c0..b394621d362c 100644 --- a/drivers/iio/inkern.c +++ b/drivers/iio/inkern.c @@ -314,6 +314,9 @@ static int iio_convert_raw_to_processed_unlocked(struct iio_channel *chan, *processed = div_s64(raw64 * (s64)scale_val * scale, scale_val2); break; + case IIO_VAL_FRACTIONAL_LOG2: + *processed = (raw64 * (s64)scale_val * scale) >> scale_val2; + break; default: return -EINVAL; } diff --git a/include/linux/iio/types.h b/include/linux/iio/types.h index 5c647ecfd5ba..87b196a2d698 100644 --- a/include/linux/iio/types.h +++ b/include/linux/iio/types.h @@ -58,5 +58,6 @@ enum iio_modifier { #define IIO_VAL_INT_PLUS_NANO 3 #define IIO_VAL_INT_PLUS_MICRO_DB 4 #define IIO_VAL_FRACTIONAL 10 +#define IIO_VAL_FRACTIONAL_LOG2 11 #endif /* _IIO_TYPES_H_ */ |