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| author | Dmitry Eremin-Solenikov <dbaryshkov@gmail.com> | 2014-11-27 01:42:45 +0300 |
|---|---|---|
| committer | Jonathan Cameron <jic23@kernel.org> | 2014-12-12 12:28:27 +0000 |
| commit | f9380e7123863a4cb0627d940533be954a0a15df (patch) | |
| tree | c85e2a56d3c30e6380314acb2179f773dfd1420d | |
| parent | c75b8dc84fd28511224a4cd2bfa791bb56a06172 (diff) | |
| download | linux-f9380e7123863a4cb0627d940533be954a0a15df.tar.bz2 | |
iio: inkern: add iio_write_channel_raw
Introduce API for easy in-kernel setting of DAC values.
Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
| -rw-r--r-- | drivers/iio/inkern.c | 25 | ||||
| -rw-r--r-- | include/linux/iio/consumer.h | 10 |
2 files changed, 35 insertions, 0 deletions
diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c index 866fe904cba2..21655fd1465c 100644 --- a/drivers/iio/inkern.c +++ b/drivers/iio/inkern.c @@ -631,3 +631,28 @@ err_unlock: return ret; } EXPORT_SYMBOL_GPL(iio_get_channel_type); + +static int iio_channel_write(struct iio_channel *chan, int val, int val2, + enum iio_chan_info_enum info) +{ + return chan->indio_dev->info->write_raw(chan->indio_dev, + chan->channel, val, val2, info); +} + +int iio_write_channel_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_write(chan, val, 0, IIO_CHAN_INFO_RAW); +err_unlock: + mutex_unlock(&chan->indio_dev->info_exist_lock); + + return ret; +} +EXPORT_SYMBOL_GPL(iio_write_channel_raw); diff --git a/include/linux/iio/consumer.h b/include/linux/iio/consumer.h index 651f9a0e2765..6f64624f329b 100644 --- a/include/linux/iio/consumer.h +++ b/include/linux/iio/consumer.h @@ -151,6 +151,16 @@ int iio_read_channel_average_raw(struct iio_channel *chan, int *val); int iio_read_channel_processed(struct iio_channel *chan, int *val); /** + * iio_write_channel_raw() - write to a given channel + * @chan: The channel being queried. + * @val: Value being written. + * + * Note raw writes to iio channels are in dac counts and hence + * scale will need to be applied if standard units required. + */ +int iio_write_channel_raw(struct iio_channel *chan, int val); + +/** * iio_get_channel_type() - get the type of a channel * @channel: The channel being queried. * @type: The type of the channel. |