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Commit 8a848e75 authored by Peter Rosin's avatar Peter Rosin Committed by Greg Kroah-Hartman
Browse files

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: default avatarJonathan Cameron <jic23@kernel.org>
Signed-off-by: default avatarPeter Rosin <peda@axentia.se>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 2c089f08

drivers/iio/inkern.c

+60 −0
Original line number Original line Diff line number Diff line
@@ -869,3 +869,63 @@ int iio_write_channel_raw(struct iio_channel *chan, int val) 
	return ret;

	return ret;

}

}

EXPORT_SYMBOL_GPL(iio_write_channel_raw);

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);

include/linux/iio/consumer.h

+37 −0
Original line number Original line Diff line number Diff line
@@ -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 iio_convert_raw_to_processed(struct iio_channel *chan, int raw,

	int *processed, unsigned int scale);

	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
 
#endif