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| author | Sebastian Reichel <sre@debian.org> | 2014-02-24 19:38:03 +0100 |
|---|---|---|
| committer | Sebastian Reichel <sre@kernel.org> | 2014-04-26 01:48:57 +0200 |
| commit | 6e7221a9f883e6fd6884c7b842d4e7c7d4baf9d4 (patch) | |
| tree | 17afe73e9115203a8db6f452eec24b2f26814be8 | |
| parent | bbc4f2ae2d48eb3e88c8e8d9f3fa03dfb562f543 (diff) | |
| download | linux-6e7221a9f883e6fd6884c7b842d4e7c7d4baf9d4.tar.bz2 | |
iio: inkern: add iio_read_channel_average_raw
Add iio_read_channel_average_raw to support reading
averaged raw values in consumer drivers.
Signed-off-by: Sebastian Reichel <sre@debian.org>
Acked-by: Jonathan Cameron <jic23@kernel.org>
| -rw-r--r-- | drivers/iio/inkern.c | 18 | ||||
| -rw-r--r-- | include/linux/iio/consumer.h | 13 |
2 files changed, 31 insertions, 0 deletions
diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c index 0cf5f8e06cfc..adeba5a0ecf7 100644 --- a/drivers/iio/inkern.c +++ b/drivers/iio/inkern.c @@ -443,6 +443,24 @@ err_unlock: } EXPORT_SYMBOL_GPL(iio_read_channel_raw); +int iio_read_channel_average_raw(struct iio_channel *chan, int *val) +{ + int ret; + + mutex_lock(&chan->indio_dev->info_exist_lock); + if (chan->indio_dev->info == NULL) { + ret = -ENODEV; + goto err_unlock; + } + + ret = iio_channel_read(chan, val, NULL, IIO_CHAN_INFO_AVERAGE_RAW); +err_unlock: + mutex_unlock(&chan->indio_dev->info_exist_lock); + + return ret; +} +EXPORT_SYMBOL_GPL(iio_read_channel_average_raw); + static int iio_convert_raw_to_processed_unlocked(struct iio_channel *chan, int raw, int *processed, unsigned int scale) { diff --git a/include/linux/iio/consumer.h b/include/linux/iio/consumer.h index 2752b1fd12be..651f9a0e2765 100644 --- a/include/linux/iio/consumer.h +++ b/include/linux/iio/consumer.h @@ -123,6 +123,19 @@ int iio_read_channel_raw(struct iio_channel *chan, int *val); /** + * iio_read_channel_average_raw() - read from a given channel + * @chan: The channel being queried. + * @val: Value read back. + * + * Note raw reads from iio channels are in adc counts and hence + * scale will need to be applied if standard units required. + * + * In opposit to the normal iio_read_channel_raw this function + * returns the average of multiple reads. + */ +int iio_read_channel_average_raw(struct iio_channel *chan, int *val); + +/** * iio_read_channel_processed() - read processed value from a given channel * @chan: The channel being queried. * @val: Value read back. |