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87800c4342
This adds the needed backend ops for supporting a backend inerfacing with an high speed dac. The new ops are: * data_source_set(); * set_sampling_freq(); * extend_chan_spec(); * ext_info_set(); * ext_info_get(). Also to note the new helpers that are meant to be used by the backends when extending an IIO channel (adding extended info): * iio_backend_ext_info_set(); * iio_backend_ext_info_get(). Signed-off-by: Nuno Sa <nuno.sa@analog.com> Link: https://lore.kernel.org/r/20240419-iio-backend-axi-dac-v4-8-5ca45b4de294@analog.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
122 lines
4.3 KiB
C
122 lines
4.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef _IIO_BACKEND_H_
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#define _IIO_BACKEND_H_
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#include <linux/types.h>
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struct iio_chan_spec;
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struct fwnode_handle;
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struct iio_backend;
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struct device;
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struct iio_dev;
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enum iio_backend_data_type {
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IIO_BACKEND_TWOS_COMPLEMENT,
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IIO_BACKEND_OFFSET_BINARY,
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IIO_BACKEND_DATA_TYPE_MAX
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};
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enum iio_backend_data_source {
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IIO_BACKEND_INTERNAL_CONTINUOS_WAVE,
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IIO_BACKEND_EXTERNAL,
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IIO_BACKEND_DATA_SOURCE_MAX
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};
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/**
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* IIO_BACKEND_EX_INFO - Helper for an IIO extended channel attribute
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* @_name: Attribute name
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* @_shared: Whether the attribute is shared between all channels
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* @_what: Data private to the driver
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*/
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#define IIO_BACKEND_EX_INFO(_name, _shared, _what) { \
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.name = (_name), \
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.shared = (_shared), \
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.read = iio_backend_ext_info_get, \
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.write = iio_backend_ext_info_set, \
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.private = (_what), \
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}
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/**
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* struct iio_backend_data_fmt - Backend data format
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* @type: Data type.
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* @sign_extend: Bool to tell if the data is sign extended.
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* @enable: Enable/Disable the data format module. If disabled,
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* not formatting will happen.
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*/
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struct iio_backend_data_fmt {
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enum iio_backend_data_type type;
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bool sign_extend;
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bool enable;
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};
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/**
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* struct iio_backend_ops - operations structure for an iio_backend
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* @enable: Enable backend.
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* @disable: Disable backend.
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* @chan_enable: Enable one channel.
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* @chan_disable: Disable one channel.
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* @data_format_set: Configure the data format for a specific channel.
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* @data_source_set: Configure the data source for a specific channel.
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* @set_sample_rate: Configure the sampling rate for a specific channel.
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* @request_buffer: Request an IIO buffer.
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* @free_buffer: Free an IIO buffer.
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* @extend_chan_spec: Extend an IIO channel.
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* @ext_info_set: Extended info setter.
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* @ext_info_get: Extended info getter.
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**/
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struct iio_backend_ops {
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int (*enable)(struct iio_backend *back);
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void (*disable)(struct iio_backend *back);
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int (*chan_enable)(struct iio_backend *back, unsigned int chan);
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int (*chan_disable)(struct iio_backend *back, unsigned int chan);
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int (*data_format_set)(struct iio_backend *back, unsigned int chan,
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const struct iio_backend_data_fmt *data);
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int (*data_source_set)(struct iio_backend *back, unsigned int chan,
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enum iio_backend_data_source data);
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int (*set_sample_rate)(struct iio_backend *back, unsigned int chan,
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u64 sample_rate_hz);
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struct iio_buffer *(*request_buffer)(struct iio_backend *back,
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struct iio_dev *indio_dev);
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void (*free_buffer)(struct iio_backend *back,
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struct iio_buffer *buffer);
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int (*extend_chan_spec)(struct iio_backend *back,
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struct iio_chan_spec *chan);
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int (*ext_info_set)(struct iio_backend *back, uintptr_t private,
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const struct iio_chan_spec *chan,
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const char *buf, size_t len);
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int (*ext_info_get)(struct iio_backend *back, uintptr_t private,
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const struct iio_chan_spec *chan, char *buf);
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};
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int iio_backend_chan_enable(struct iio_backend *back, unsigned int chan);
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int iio_backend_chan_disable(struct iio_backend *back, unsigned int chan);
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int devm_iio_backend_enable(struct device *dev, struct iio_backend *back);
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int iio_backend_data_format_set(struct iio_backend *back, unsigned int chan,
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const struct iio_backend_data_fmt *data);
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int iio_backend_data_source_set(struct iio_backend *back, unsigned int chan,
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enum iio_backend_data_source data);
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int iio_backend_set_sampling_freq(struct iio_backend *back, unsigned int chan,
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u64 sample_rate_hz);
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int devm_iio_backend_request_buffer(struct device *dev,
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struct iio_backend *back,
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struct iio_dev *indio_dev);
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ssize_t iio_backend_ext_info_set(struct iio_dev *indio_dev, uintptr_t private,
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const struct iio_chan_spec *chan,
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const char *buf, size_t len);
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ssize_t iio_backend_ext_info_get(struct iio_dev *indio_dev, uintptr_t private,
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const struct iio_chan_spec *chan, char *buf);
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int iio_backend_extend_chan_spec(struct iio_dev *indio_dev,
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struct iio_backend *back,
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struct iio_chan_spec *chan);
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void *iio_backend_get_priv(const struct iio_backend *conv);
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struct iio_backend *devm_iio_backend_get(struct device *dev, const char *name);
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struct iio_backend *
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__devm_iio_backend_get_from_fwnode_lookup(struct device *dev,
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struct fwnode_handle *fwnode);
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int devm_iio_backend_register(struct device *dev,
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const struct iio_backend_ops *ops, void *priv);
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#endif
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