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  +   €l–Ь4э( ©і( 	ЕЂfаB¦-яї„l¶_†I|ҐЏ+ГВ ;ц    /* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Industrial I/O in kernel consumer interface
 *
 * Copyright (c) 2011 Jonathan Cameron
 */
#ifndef _IIO_INKERN_CONSUMER_H_
#define _IIO_INKERN_CONSUMER_H_

#include <linux/types.h>
#include <linux/iio/types.h>

struct iio_dev;
struct iio_chan_spec;
struct device;
struct device_node;

/**
 * struct iio_channel - everything needed for a consumer to use a channel
 * @indio_dev:		Device on which the channel exists.
 * @channel:		Full description of the channel.
 * @data:		Data about the channel used by consumer.
 */
struct iio_channel {
	struct iio_dev *indio_dev;
	const struct iio_chan_spec *channel;
	void *data;
};

/**
 * iio_channel_get() - get description of all that is needed to access channel.
 * @dev:		Pointer to consumer device. Device name must match
 *			the name of the device as provided in the iio_map
 *			with which the desired provider to consumer mapping
 *			was registered.
 * @consumer_channel:	Unique name to identify the channel on the consumer
 *			side. This typically describes the channels use within
 *			the consumer. E.g. 'battery_voltage'
 */
struct iio_channel *iio_channel_get(struct device *dev,
				    const char *consumer_channel);

/**
 * iio_channel_release() - release channels obtained via iio_channel_get
 * @chan:		The channel to be released.
 */
void iio_channel_release(struct iio_channel *chan);

/**
 * devm_iio_channel_get() - Resource managed version of iio_channel_get().
 * @dev:		Pointer to consumer device. Device name must match
 *			the name of the device as provided in the iio_map
 *			with which the desired provider to consumer mapping
 *			was registered.
 * @consumer_channel:	Unique name to identify the channel on the consumer
 *			side. This typically describes the channels use within
 *			the consumer. E.g. 'battery_voltage'
 *
 * Returns a pointer to negative errno if it is not able to get the iio channel
 * otherwise returns valid pointer for iio channel.
 *
 * The allocated iio channel is automatically released when the device is
 * unbound.
 */
struct iio_channel *devm_iio_channel_get(struct device *dev,
					 const char *consumer_channel);
/**
 * iio_channel_get_all() - get all channels associated with a client
 * @dev:		Pointer to consumer device.
 *
 * Returns an array of iio_channel structures terminated with one with
 * null iio_dev pointer.
 * This function is used by fairly generic consumers to get all the
 * channels registered as having this consumer.
 */
struct iio_channel *iio_channel_get_all(struct device *dev);

/**
 * iio_channel_release_all() - reverse iio_channel_get_all
 * @chan:		Array of channels to be released.
 */
void iio_channel_release_all(struct iio_channel *chan);

/**
 * devm_iio_channel_get_all() - Resource managed version of
 *				iio_channel_get_all().
 * @dev: Pointer to consumer device.
 *
 * Returns a pointer to negative errno if it is not able to get the iio channel
 * otherwise returns an array of iio_channel structures terminated with one with
 * null iio_dev pointer.
 *
 * This function is used by fairly generic consumers to get all the
 * channels registered as having this consumer.
 *
 * The allocated iio channels are automatically released when the device is
 * unbounded.
 */
struct iio_channel *devm_iio_channel_get_all(struct device *dev);

/**
 * of_iio_channel_get_by_name() - get description of all that is needed to access channel.
 * @np:			Pointer to consumer device tree node
 * @consumer_channel:	Unique name to identify the channel on the consumer
 *			side. This typically describes the channels use within
 *			the consumer. E.g. 'battery_voltage'
 */
#ifdef CONFIG_OF
struct iio_channel *of_iio_channel_get_by_name(struct device_node *np, const char *name);
#else
static inline struct iio_channel *
of_iio_channel_get_by_name(struct device_node *np, const char *name)
{
	return NULL;
}
#endif

/**
 * devm_of_iio_channel_get_by_name() - Resource managed version of of_iio_channel_get_by_name().
 * @dev:		Pointer to consumer d