This is a note to let you know that I've just added the patch titled
iio: afe: rescale: expose scale processing function
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
iio-afe-rescale-expose-scale-processing-function.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 49297ba6a1b82ab14c6e0e0df935ab947941e7f0
Author: Liam Beguin <liambeguin@xxxxxxxxx>
Date: Sat Feb 12 21:57:30 2022 -0500
iio: afe: rescale: expose scale processing function
[ Upstream commit bc437f7515f5e14aec9f2801412d9ea48116a97d ]
In preparation for the addition of kunit tests, expose the logic
responsible for combining channel scales.
Signed-off-by: Liam Beguin <liambeguin@xxxxxxxxx>
Reviewed-by: Peter Rosin <peda@xxxxxxxxxx>
Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
Link: https://lore.kernel.org/r/20220213025739.2561834-2-liambeguin@xxxxxxxxx
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Stable-dep-of: bee448390e51 ("iio: afe: rescale: Accept only offset channels")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/iio/afe/iio-rescale.c b/drivers/iio/afe/iio-rescale.c
index b0934f85a4a04..6cc453ab9c685 100644
--- a/drivers/iio/afe/iio-rescale.c
+++ b/drivers/iio/afe/iio-rescale.c
@@ -15,32 +15,43 @@
#include <linux/platform_device.h>
#include <linux/property.h>
+#include <linux/iio/afe/rescale.h>
#include <linux/iio/consumer.h>
#include <linux/iio/iio.h>
-struct rescale;
-
-struct rescale_cfg {
- enum iio_chan_type type;
- int (*props)(struct device *dev, struct rescale *rescale);
-};
+int rescale_process_scale(struct rescale *rescale, int scale_type,
+ int *val, int *val2)
+{
+ s64 tmp;
-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;
-};
+ switch (scale_type) {
+ case IIO_VAL_FRACTIONAL:
+ *val *= rescale->numerator;
+ *val2 *= rescale->denominator;
+ return scale_type;
+ case IIO_VAL_INT:
+ *val *= rescale->numerator;
+ if (rescale->denominator == 1)
+ return scale_type;
+ *val2 = rescale->denominator;
+ return IIO_VAL_FRACTIONAL;
+ case IIO_VAL_FRACTIONAL_LOG2:
+ tmp = (s64)*val * 1000000000LL;
+ tmp = div_s64(tmp, rescale->denominator);
+ tmp *= rescale->numerator;
+ tmp = div_s64(tmp, 1000000000LL);
+ *val = tmp;
+ return scale_type;
+ default:
+ return -EOPNOTSUPP;
+ }
+}
static int rescale_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
{
struct rescale *rescale = iio_priv(indio_dev);
- s64 tmp;
int ret;
switch (mask) {
@@ -66,27 +77,7 @@ static int rescale_read_raw(struct iio_dev *indio_dev,
} else {
ret = iio_read_channel_scale(rescale->source, val, val2);
}
- switch (ret) {
- case IIO_VAL_FRACTIONAL:
- *val *= rescale->numerator;
- *val2 *= rescale->denominator;
- return ret;
- case IIO_VAL_INT:
- *val *= rescale->numerator;
- if (rescale->denominator == 1)
- return ret;
- *val2 = rescale->denominator;
- return IIO_VAL_FRACTIONAL;
- case IIO_VAL_FRACTIONAL_LOG2:
- tmp = (s64)*val * 1000000000LL;
- tmp = div_s64(tmp, rescale->denominator);
- tmp *= rescale->numerator;
- tmp = div_s64(tmp, 1000000000LL);
- *val = tmp;
- return ret;
- default:
- return -EOPNOTSUPP;
- }
+ return rescale_process_scale(rescale, ret, val, val2);
default:
return -EINVAL;
}
diff --git a/include/linux/iio/afe/rescale.h b/include/linux/iio/afe/rescale.h
new file mode 100644
index 0000000000000..8a2eb34af3271
--- /dev/null
+++ b/include/linux/iio/afe/rescale.h
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2018 Axentia Technologies AB
+ */
+
+#ifndef __IIO_RESCALE_H__
+#define __IIO_RESCALE_H__
+
+#include <linux/types.h>
+#include <linux/iio/iio.h>
+
+struct device;
+struct rescale;
+
+struct rescale_cfg {
+ enum iio_chan_type type;
+ int (*props)(struct device *dev, struct rescale *rescale);
+};
+
+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;
+};
+
+int rescale_process_scale(struct rescale *rescale, int scale_type,
+ int *val, int *val2);
+#endif /* __IIO_RESCALE_H__ */
