diff options
| author | Peter Rosin <peda@axentia.se> | 2017-05-14 22:51:08 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-06-03 13:29:26 +0300 |
| commit | 8a848e754956dcbc35cd2fcf417f66dafa020c9e (patch) | |
| tree | a446e35c6cf3d5f1421ee9c369d94916cd2b5971 /include/linux/iio/consumer.h | |
| parent | 2c089f08e0de2a784106272c6454ce389fe12376 (diff) | |
| download | linux-8a848e754956dcbc35cd2fcf417f66dafa020c9e.tar.xz | |
iio: inkern: api for manipulating ext_info of iio channels
Extend the inkern api with functions for reading and writing ext_info
of iio channels.
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/iio/consumer.h')
| -rw-r--r-- | include/linux/iio/consumer.h | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/include/linux/iio/consumer.h b/include/linux/iio/consumer.h index 47eeec3218b5..5e347a9805fd 100644 --- a/include/linux/iio/consumer.h +++ b/include/linux/iio/consumer.h @@ -312,4 +312,41 @@ int iio_read_channel_scale(struct iio_channel *chan, int *val, int iio_convert_raw_to_processed(struct iio_channel *chan, int raw, int *processed, unsigned int scale); +/** + * iio_get_channel_ext_info_count() - get number of ext_info attributes + * connected to the channel. + * @chan: The channel being queried + * + * Returns the number of ext_info attributes + */ +unsigned int iio_get_channel_ext_info_count(struct iio_channel *chan); + +/** + * iio_read_channel_ext_info() - read ext_info attribute from a given channel + * @chan: The channel being queried. + * @attr: The ext_info attribute to read. + * @buf: Where to store the attribute value. Assumed to hold + * at least PAGE_SIZE bytes. + * + * Returns the number of bytes written to buf (perhaps w/o zero termination; + * it need not even be a string), or an error code. + */ +ssize_t iio_read_channel_ext_info(struct iio_channel *chan, + const char *attr, char *buf); + +/** + * iio_write_channel_ext_info() - write ext_info attribute from a given channel + * @chan: The channel being queried. + * @attr: The ext_info attribute to read. + * @buf: The new attribute value. Strings needs to be zero- + * terminated, but the terminator should not be included + * in the below len. + * @len: The size of the new attribute value. + * + * Returns the number of accepted bytes, which should be the same as len. + * An error code can also be returned. + */ +ssize_t iio_write_channel_ext_info(struct iio_channel *chan, const char *attr, + const char *buf, size_t len); + #endif |