linux/include/linux/iio/backend.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _IIO_BACKEND_H_
#define _IIO_BACKEND_H_

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

struct iio_chan_spec;
struct fwnode_handle;
struct iio_backend;
struct device;
struct iio_dev;

enum iio_backend_data_type { … };

enum iio_backend_data_source { … };

#define iio_backend_debugfs_ptr(ptr) …

/**
 * IIO_BACKEND_EX_INFO - Helper for an IIO extended channel attribute
 * @_name: Attribute name
 * @_shared: Whether the attribute is shared between all channels
 * @_what: Data private to the driver
 */
#define IIO_BACKEND_EX_INFO(_name, _shared, _what) …

/**
 * struct iio_backend_data_fmt - Backend data format
 * @type: Data type.
 * @sign_extend: Bool to tell if the data is sign extended.
 * @enable: Enable/Disable the data format module. If disabled,
 *	    not formatting will happen.
 */
struct iio_backend_data_fmt { … };

/* vendor specific from 32 */
enum iio_backend_test_pattern { … };

enum iio_backend_sample_trigger { … };

/**
 * struct iio_backend_ops - operations structure for an iio_backend
 * @enable: Enable backend.
 * @disable: Disable backend.
 * @chan_enable: Enable one channel.
 * @chan_disable: Disable one channel.
 * @data_format_set: Configure the data format for a specific channel.
 * @data_source_set: Configure the data source for a specific channel.
 * @set_sample_rate: Configure the sampling rate for a specific channel.
 * @test_pattern_set: Configure a test pattern.
 * @chan_status: Get the channel status.
 * @iodelay_set: Set digital I/O delay.
 * @data_sample_trigger: Control when to sample data.
 * @request_buffer: Request an IIO buffer.
 * @free_buffer: Free an IIO buffer.
 * @extend_chan_spec: Extend an IIO channel.
 * @ext_info_set: Extended info setter.
 * @ext_info_get: Extended info getter.
 * @read_raw: Read a channel attribute from a backend device
 * @debugfs_print_chan_status: Print channel status into a buffer.
 * @debugfs_reg_access: Read or write register value of backend.
 **/
struct iio_backend_ops { … };

/**
 * struct iio_backend_info - info structure for an iio_backend
 * @name: Backend name.
 * @ops: Backend operations.
 */
struct iio_backend_info { … };

int iio_backend_chan_enable(struct iio_backend *back, unsigned int chan);
int iio_backend_chan_disable(struct iio_backend *back, unsigned int chan);
int devm_iio_backend_enable(struct device *dev, struct iio_backend *back);
int iio_backend_enable(struct iio_backend *back);
void iio_backend_disable(struct iio_backend *back);
int iio_backend_data_format_set(struct iio_backend *back, unsigned int chan,
				const struct iio_backend_data_fmt *data);
int iio_backend_data_source_set(struct iio_backend *back, unsigned int chan,
				enum iio_backend_data_source data);
int iio_backend_set_sampling_freq(struct iio_backend *back, unsigned int chan,
				  u64 sample_rate_hz);
int iio_backend_test_pattern_set(struct iio_backend *back,
				 unsigned int chan,
				 enum iio_backend_test_pattern pattern);
int iio_backend_chan_status(struct iio_backend *back, unsigned int chan,
			    bool *error);
int iio_backend_iodelay_set(struct iio_backend *back, unsigned int lane,
			    unsigned int taps);
int iio_backend_data_sample_trigger(struct iio_backend *back,
				    enum iio_backend_sample_trigger trigger);
int devm_iio_backend_request_buffer(struct device *dev,
				    struct iio_backend *back,
				    struct iio_dev *indio_dev);
ssize_t iio_backend_ext_info_set(struct iio_dev *indio_dev, uintptr_t private,
				 const struct iio_chan_spec *chan,
				 const char *buf, size_t len);
ssize_t iio_backend_ext_info_get(struct iio_dev *indio_dev, uintptr_t private,
				 const struct iio_chan_spec *chan, char *buf);
int iio_backend_read_raw(struct iio_backend *back,
			 struct iio_chan_spec const *chan, int *val, int *val2,
			 long mask);
int iio_backend_extend_chan_spec(struct iio_backend *back,
				 struct iio_chan_spec *chan);
void *iio_backend_get_priv(const struct iio_backend *conv);
struct iio_backend *devm_iio_backend_get(struct device *dev, const char *name);
struct iio_backend *devm_iio_backend_fwnode_get(struct device *dev,
						const char *name,
						struct fwnode_handle *fwnode);
struct iio_backend *
__devm_iio_backend_get_from_fwnode_lookup(struct device *dev,
					  struct fwnode_handle *fwnode);

int devm_iio_backend_register(struct device *dev,
			      const struct iio_backend_info *info, void *priv);

static inline int iio_backend_read_scale(struct iio_backend *back,
					 struct iio_chan_spec const *chan,
					 int *val, int *val2)
{ … }

static inline int iio_backend_read_offset(struct iio_backend *back,
					  struct iio_chan_spec const *chan,
					  int *val, int *val2)
{ … }

ssize_t iio_backend_debugfs_print_chan_status(struct iio_backend *back,
					      unsigned int chan, char *buf,
					      size_t len);
void iio_backend_debugfs_add(struct iio_backend *back,
			     struct iio_dev *indio_dev);
#endif