linux-kernel - [PATCH v2 01/13] iio: backend: add support for filter config

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Message-ID: <20250411123627.6114-2-antoniu.miclaus@analog.com>
Date: Fri, 11 Apr 2025 15:36:15 +0300
From: Antoniu Miclaus <antoniu.miclaus@...log.com>
To: <jic23@...nel.org>, <robh@...nel.org>, <conor+dt@...nel.org>,
        <linux-iio@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC: Antoniu Miclaus <antoniu.miclaus@...log.com>
Subject: [PATCH v2 01/13] iio: backend: add support for filter config

Add backend support for digital filter enable/disable.

This setting can be adjusted within the IP cores interfacing devices.

The IP core can be configured based on the state of the actual
digital filter configuration of the part.

Signed-off-by: Antoniu Miclaus <antoniu.miclaus@...log.com>
---
changes in v2:
 - improve commit description
 drivers/iio/industrialio-backend.c | 26 ++++++++++++++++++++++++++
 include/linux/iio/backend.h        |  6 ++++++
 2 files changed, 32 insertions(+)

diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-backend.c
index d4ad36f54090..ffafe7c73508 100644
--- a/drivers/iio/industrialio-backend.c
+++ b/drivers/iio/industrialio-backend.c
@@ -778,6 +778,32 @@ static int __devm_iio_backend_get(struct device *dev, struct iio_backend *back)
 	return 0;
 }
 
+/**
+ * iio_backend_filter_enable - Enable filter
+ * @back: Backend device
+ *
+ * RETURNS:
+ * 0 on success, negative error number on failure.
+ */
+int iio_backend_filter_enable(struct iio_backend *back)
+{
+	return iio_backend_op_call(back, filter_enable);
+}
+EXPORT_SYMBOL_NS_GPL(iio_backend_filter_enable, "IIO_BACKEND");
+
+/**
+ * iio_backend_filter_disable - Disable filter
+ * @back: Backend device
+ *
+ * RETURNS:
+ * 0 on success, negative error number on failure.
+ */
+int iio_backend_filter_disable(struct iio_backend *back)
+{
+	return iio_backend_op_call(back, filter_disable);
+}
+EXPORT_SYMBOL_NS_GPL(iio_backend_filter_disable, "IIO_BACKEND");
+
 /**
  * iio_backend_ddr_enable - Enable interface DDR (Double Data Rate) mode
  * @back: Backend device
diff --git a/include/linux/iio/backend.h b/include/linux/iio/backend.h
index e45b7dfbec35..7987d9f1cdb3 100644
--- a/include/linux/iio/backend.h
+++ b/include/linux/iio/backend.h
@@ -100,6 +100,8 @@ enum iio_backend_interface_type {
  * @read_raw: Read a channel attribute from a backend device
  * @debugfs_print_chan_status: Print channel status into a buffer.
  * @debugfs_reg_access: Read or write register value of backend.
+ * @filter_enable: Enable filter.
+ * @filter_disable: Disable filter.
  * @ddr_enable: Enable interface DDR (Double Data Rate) mode.
  * @ddr_disable: Disable interface DDR (Double Data Rate) mode.
  * @data_stream_enable: Enable data stream.
@@ -150,6 +152,8 @@ struct iio_backend_ops {
 					 size_t len);
 	int (*debugfs_reg_access)(struct iio_backend *back, unsigned int reg,
 				  unsigned int writeval, unsigned int *readval);
+	int (*filter_enable)(struct iio_backend *back);
+	int (*filter_disable)(struct iio_backend *back);
 	int (*ddr_enable)(struct iio_backend *back);
 	int (*ddr_disable)(struct iio_backend *back);
 	int (*data_stream_enable)(struct iio_backend *back);
@@ -190,6 +194,8 @@ int iio_backend_data_sample_trigger(struct iio_backend *back,
 int devm_iio_backend_request_buffer(struct device *dev,
 				    struct iio_backend *back,
 				    struct iio_dev *indio_dev);
+int iio_backend_filter_enable(struct iio_backend *back);
+int iio_backend_filter_disable(struct iio_backend *back);
 int iio_backend_ddr_enable(struct iio_backend *back);
 int iio_backend_ddr_disable(struct iio_backend *back);
 int iio_backend_data_stream_enable(struct iio_backend *back);
-- 
2.49.0