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iio: afe: rescale: expose scale processing function
In preparation for the addition of kunit tests, expose the logic responsible for combining channel scales. Signed-off-by: Liam Beguin <liambeguin@gmail.com> Reviewed-by: Peter Rosin <peda@axentia.se> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Link: https://lore.kernel.org/r/20220213025739.2561834-2-liambeguin@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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Liam Beguin
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Jonathan Cameron
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Feb 27, 2022
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/* SPDX-License-Identifier: GPL-2.0-only */ | ||
/* | ||
* Copyright (C) 2018 Axentia Technologies AB | ||
*/ | ||
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#ifndef __IIO_RESCALE_H__ | ||
#define __IIO_RESCALE_H__ | ||
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#include <linux/types.h> | ||
#include <linux/iio/iio.h> | ||
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struct device; | ||
struct rescale; | ||
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struct rescale_cfg { | ||
enum iio_chan_type type; | ||
int (*props)(struct device *dev, struct rescale *rescale); | ||
}; | ||
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struct rescale { | ||
const struct rescale_cfg *cfg; | ||
struct iio_channel *source; | ||
struct iio_chan_spec chan; | ||
struct iio_chan_spec_ext_info *ext_info; | ||
bool chan_processed; | ||
s32 numerator; | ||
s32 denominator; | ||
}; | ||
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int rescale_process_scale(struct rescale *rescale, int scale_type, | ||
int *val, int *val2); | ||
#endif /* __IIO_RESCALE_H__ */ |