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Message-ID: <20240703160535.2277871-2-olivier.moysan@foss.st.com>
Date: Wed, 3 Jul 2024 18:05:26 +0200
From: Olivier Moysan <olivier.moysan@...s.st.com>
To: Nuno Sa <nuno.sa@...log.com>, Olivier Moysan <olivier.moysan@...s.st.com>,
Jonathan Cameron <jic23@...nel.org>,
Lars-Peter Clausen <lars@...afoo.de>
CC: <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v3 1/8] iio: add read scale and offset services to iio backend framework
Add iio_backend_read_scale() and iio_backend_read_offset() services
to read channel scale and offset from an IIO backbend device.
Also add a read_raw callback which replicates the read_raw callback of
the IIO framework, and is intended to request miscellaneous channel
attributes from the backend device.
Both scale and offset helpers use this callback.
Signed-off-by: Olivier Moysan <olivier.moysan@...s.st.com>
Reviewed-by: Nuno Sa <nuno.sa@...log.com>
---
drivers/iio/industrialio-backend.c | 30 ++++++++++++++++++++++++++++++
include/linux/iio/backend.h | 7 ++++++-
2 files changed, 36 insertions(+), 1 deletion(-)
diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-backend.c
index efe05be284b6..1d3d6dbdcc4e 100644
--- a/drivers/iio/industrialio-backend.c
+++ b/drivers/iio/industrialio-backend.c
@@ -357,6 +357,36 @@ int devm_iio_backend_request_buffer(struct device *dev,
}
EXPORT_SYMBOL_NS_GPL(devm_iio_backend_request_buffer, IIO_BACKEND);
+/**
+ * iio_backend_read_scale - Request channel scale from the IIO backend.
+ * @back: Backend device
+ * @chan: IIO channel reference
+ * @scale: returned scale value
+ *
+ * RETURNS:
+ * 0 on success, negative error number on failure.
+ */
+int iio_backend_read_scale(struct iio_backend *back, struct iio_chan_spec const *chan, int *scale)
+{
+ return iio_backend_op_call(back, read_raw, chan, scale, 0, IIO_CHAN_INFO_SCALE);
+}
+EXPORT_SYMBOL_NS_GPL(iio_backend_read_scale, IIO_BACKEND);
+
+/**
+ * iio_backend_read_offset - Request channel offset from the IIO backend.
+ * @back: Backend device
+ * @chan: IIO channel reference
+ * @offset: returned offset value
+ *
+ * RETURNS:
+ * 0 on success, negative error number on failure.
+ */
+int iio_backend_read_offset(struct iio_backend *back, struct iio_chan_spec const *chan, int *offset)
+{
+ return iio_backend_op_call(back, read_raw, chan, offset, 0, IIO_CHAN_INFO_OFFSET);
+}
+EXPORT_SYMBOL_NS_GPL(iio_backend_read_offset, IIO_BACKEND);
+
static struct iio_backend *iio_backend_from_indio_dev_parent(const struct device *dev)
{
struct iio_backend *back = ERR_PTR(-ENODEV), *iter;
diff --git a/include/linux/iio/backend.h b/include/linux/iio/backend.h
index 8099759d7242..cbad233ae9f2 100644
--- a/include/linux/iio/backend.h
+++ b/include/linux/iio/backend.h
@@ -81,6 +81,7 @@ enum iio_backend_sample_trigger {
* @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
**/
struct iio_backend_ops {
int (*enable)(struct iio_backend *back);
@@ -113,6 +114,8 @@ struct iio_backend_ops {
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 (*read_raw)(struct iio_backend *back, struct iio_chan_spec const *chan, int *val,
+ int *val2, long mask);
};
int iio_backend_chan_enable(struct iio_backend *back, unsigned int chan);
@@ -141,7 +144,9 @@ ssize_t iio_backend_ext_info_set(struct iio_dev *indio_dev, uintptr_t private,
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_scale(struct iio_backend *back, struct iio_chan_spec const *chan, int *scale);
+int iio_backend_read_offset(struct iio_backend *back, struct iio_chan_spec const *chan,
+ int *offset);
int iio_backend_extend_chan_spec(struct iio_dev *indio_dev,
struct iio_backend *back,
struct iio_chan_spec *chan);
--
2.25.1
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