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iio: inkern: add iio_write_channel_raw

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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>
This commit is contained in:
Dmitry Eremin-Solenikov 2014-11-27 01:42:45 +03:00 committed by Jonathan Cameron
parent c75b8dc84f
commit f9380e7123
2 changed files with 35 additions and 0 deletions
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25
drivers/iio/inkern.c
View File

@ -631,3 +631,28 @@ err_unlock:
return ret; return ret;
} }
EXPORT_SYMBOL_GPL(iio_get_channel_type); 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);

10
include/linux/iio/consumer.h
View File

@ -150,6 +150,16 @@ int iio_read_channel_average_raw(struct iio_channel *chan, int *val);
*/ */
int iio_read_channel_processed(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 * iio_get_channel_type() - get the type of a channel
* @channel: The channel being queried. * @channel: The channel being queried.