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author | Peter Rosin <peda@axentia.se> | 2017-05-14 21:51:08 +0200 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-06-03 19:29:26 +0900 |
commit | 8a848e754956dcbc35cd2fcf417f66dafa020c9e (patch) | |
tree | a446e35c6cf3d5f1421ee9c369d94916cd2b5971 /drivers/iio/inkern.c | |
parent | 2c089f08e0de2a784106272c6454ce389fe12376 (diff) | |
download | linux-8a848e754956dcbc35cd2fcf417f66dafa020c9e.tar.gz linux-8a848e754956dcbc35cd2fcf417f66dafa020c9e.tar.bz2 linux-8a848e754956dcbc35cd2fcf417f66dafa020c9e.zip |
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 'drivers/iio/inkern.c')
-rw-r--r-- | drivers/iio/inkern.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c index 7a13535dc3e9..8292ad4435ea 100644 --- a/drivers/iio/inkern.c +++ b/drivers/iio/inkern.c @@ -869,3 +869,63 @@ err_unlock: return ret; } EXPORT_SYMBOL_GPL(iio_write_channel_raw); + +unsigned int iio_get_channel_ext_info_count(struct iio_channel *chan) +{ + const struct iio_chan_spec_ext_info *ext_info; + unsigned int i = 0; + + if (!chan->channel->ext_info) + return i; + + for (ext_info = chan->channel->ext_info; ext_info->name; ext_info++) + ++i; + + return i; +} +EXPORT_SYMBOL_GPL(iio_get_channel_ext_info_count); + +static const struct iio_chan_spec_ext_info *iio_lookup_ext_info( + const struct iio_channel *chan, + const char *attr) +{ + const struct iio_chan_spec_ext_info *ext_info; + + if (!chan->channel->ext_info) + return NULL; + + for (ext_info = chan->channel->ext_info; ext_info->name; ++ext_info) { + if (!strcmp(attr, ext_info->name)) + return ext_info; + } + + return NULL; +} + +ssize_t iio_read_channel_ext_info(struct iio_channel *chan, + const char *attr, char *buf) +{ + const struct iio_chan_spec_ext_info *ext_info; + + ext_info = iio_lookup_ext_info(chan, attr); + if (!ext_info) + return -EINVAL; + + return ext_info->read(chan->indio_dev, ext_info->private, + chan->channel, buf); +} +EXPORT_SYMBOL_GPL(iio_read_channel_ext_info); + +ssize_t iio_write_channel_ext_info(struct iio_channel *chan, const char *attr, + const char *buf, size_t len) +{ + const struct iio_chan_spec_ext_info *ext_info; + + ext_info = iio_lookup_ext_info(chan, attr); + if (!ext_info) + return -EINVAL; + + return ext_info->write(chan->indio_dev, ext_info->private, + chan->channel, buf, len); +} +EXPORT_SYMBOL_GPL(iio_write_channel_ext_info); |