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    Subject[PATCH v9 04/10] iio: inkern: api for manipulating ext_info of iio channels
    Date
    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>
    ---
    drivers/iio/inkern.c | 60 ++++++++++++++++++++++++++++++++++++++++++++
    include/linux/iio/consumer.h | 37 +++++++++++++++++++++++++++
    2 files changed, 97 insertions(+)

    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 @@ int iio_write_channel_raw(struct iio_channel *chan, int val)
    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);
    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
    --
    2.1.4
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