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/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _IIO_BACKEND_H_
#define _IIO_BACKEND_H_
#include <linux/types.h>
struct iio_chan_spec;
struct fwnode_handle;
struct iio_backend;
struct device;
struct iio_dev;
enum iio_backend_data_type {
IIO_BACKEND_TWOS_COMPLEMENT,
IIO_BACKEND_OFFSET_BINARY,
IIO_BACKEND_DATA_TYPE_MAX
};
enum iio_backend_data_source {
IIO_BACKEND_INTERNAL_CONTINUOS_WAVE,
IIO_BACKEND_EXTERNAL,
IIO_BACKEND_DATA_SOURCE_MAX
};
/**
* 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) { \
.name = (_name), \
.shared = (_shared), \
.read = iio_backend_ext_info_get, \
.write = iio_backend_ext_info_set, \
.private = (_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 {
enum iio_backend_data_type type;
bool sign_extend;
bool enable;
};
/**
* 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.
* @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.
**/
struct iio_backend_ops {
int (*enable)(struct iio_backend *back);
void (*disable)(struct iio_backend *back);
int (*chan_enable)(struct iio_backend *back, unsigned int chan);
int (*chan_disable)(struct iio_backend *back, unsigned int chan);
int (*data_format_set)(struct iio_backend *back, unsigned int chan,
const struct iio_backend_data_fmt *data);
int (*data_source_set)(struct iio_backend *back, unsigned int chan,
enum iio_backend_data_source data);
int (*set_sample_rate)(struct iio_backend *back, unsigned int chan,
u64 sample_rate_hz);
struct iio_buffer *(*request_buffer)(struct iio_backend *back,
struct iio_dev *indio_dev);
void (*free_buffer)(struct iio_backend *back,
struct iio_buffer *buffer);
int (*extend_chan_spec)(struct iio_backend *back,
struct iio_chan_spec *chan);
int (*ext_info_set)(struct iio_backend *back, uintptr_t private,
const struct iio_chan_spec *chan,
const char *buf, size_t len);
int (*ext_info_get)(struct iio_backend *back, uintptr_t private,
const struct iio_chan_spec *chan, char *buf);
};
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_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 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_extend_chan_spec(struct iio_dev *indio_dev,
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_get_from_fwnode_lookup(struct device *dev,
struct fwnode_handle *fwnode);
int devm_iio_backend_register(struct device *dev,
const struct iio_backend_ops *ops, void *priv);
#endif
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