linux-kernel - [PATCH v4 02/10] iio: backend: add support for data alignment

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Message-ID: <20250502085905.24926-3-antoniu.miclaus@analog.com>
Date: Fri, 2 May 2025 11:58:57 +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 v4 02/10] iio: backend: add support for data alignment

Add backend support for staring the capture synchronization.
When activated, it initates a proccess that aligns the sample's most
significant bit (MSB) based solely on the captured data, without
considering any other external signals.

Signed-off-by: Antoniu Miclaus <antoniu.miclaus@...log.com>
---
changes in v4:
 - implement iio_backend_interface_data_align with timeout parameter.
 drivers/iio/industrialio-backend.c | 14 ++++++++++++++
 include/linux/iio/backend.h        |  3 +++
 2 files changed, 17 insertions(+)

diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-backend.c
index 038c9e1e2857..b7cbbc7a8fcd 100644
--- a/drivers/iio/industrialio-backend.c
+++ b/drivers/iio/industrialio-backend.c
@@ -796,6 +796,20 @@ int iio_backend_filter_type_set(struct iio_backend *back,
 }
 EXPORT_SYMBOL_NS_GPL(iio_backend_filter_type_set, "IIO_BACKEND");
 
+/**
+ * iio_backend_data_align - Perform the data alignment process.
+ * @back: Backend device
+ * @timeout: Timeout value.
+ *
+ * RETURNS:
+ * 0 on success, negative error number on failure.
+ */
+int iio_backend_interface_data_align(struct iio_backend *back, u32 timeout)
+{
+	return iio_backend_op_call(back, interface_data_align, timeout);
+}
+EXPORT_SYMBOL_NS_GPL(iio_backend_interface_data_align, "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 5526800f5d4a..452cb2838dad 100644
--- a/include/linux/iio/backend.h
+++ b/include/linux/iio/backend.h
@@ -109,6 +109,7 @@ enum iio_backend_filter_type {
  * @debugfs_print_chan_status: Print channel status into a buffer.
  * @debugfs_reg_access: Read or write register value of backend.
  * @filter_type_set: Set filter type.
+ * @interface_data_align: Perform the data alignment process.
  * @ddr_enable: Enable interface DDR (Double Data Rate) mode.
  * @ddr_disable: Disable interface DDR (Double Data Rate) mode.
  * @data_stream_enable: Enable data stream.
@@ -161,6 +162,7 @@ struct iio_backend_ops {
 				  unsigned int writeval, unsigned int *readval);
 	int (*filter_type_set)(struct iio_backend *back,
 			       enum iio_backend_filter_type type);
+	int (*interface_data_align)(struct iio_backend *back, u32 timeout);
 	int (*ddr_enable)(struct iio_backend *back);
 	int (*ddr_disable)(struct iio_backend *back);
 	int (*data_stream_enable)(struct iio_backend *back);
@@ -203,6 +205,7 @@ int devm_iio_backend_request_buffer(struct device *dev,
 				    struct iio_dev *indio_dev);
 int iio_backend_filter_type_set(struct iio_backend *back,
 				enum iio_backend_filter_type type);
+int iio_backend_interface_data_align(struct iio_backend *back, u32 timeout);
 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