linux-kernel - [RFC PATCH 08/12] iio: buffer: add helper to get the IIO device to which a buffer belongs

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Date:   Tue, 17 Nov 2020 18:23:36 +0200
From:   Alexandru Ardelean <alexandru.ardelean@...log.com>
To:     <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <lars@...afoo.de>, <jic23@...nel.org>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>
Subject: [RFC PATCH 08/12] iio: buffer: add helper to get the IIO device to which a buffer belongs

This is useful for drivers that may have a reference to an IIO buffer, to
be able to get a reference back to the IIO device.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
---
 drivers/iio/industrialio-buffer.c | 14 ++++++++++++++
 include/linux/iio/buffer.h        |  2 ++
 2 files changed, 16 insertions(+)

diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
index 8b4b7baf21da..342e5432f7d9 100644
--- a/drivers/iio/industrialio-buffer.c
+++ b/drivers/iio/industrialio-buffer.c
@@ -1736,6 +1736,20 @@ void iio_buffer_put(struct iio_buffer *buffer)
 }
 EXPORT_SYMBOL_GPL(iio_buffer_put);
 
+/**
+ * iio_buffer_get_iio_dev - Get the IIO device to which this buffer belongs to
+ * @buffer: The buffer for which to retrieve the IIO device
+ *
+ * This function retrieves the IIO device to which this IIO buffer is attached
+ * to. Given that an IIO device may have multiple IIO buffers, it's useful
+ * for some drivers to obtain a reference back to the IIO device.
+ */
+struct iio_dev *iio_buffer_get_iio_dev(struct iio_buffer *buffer)
+{
+	return buffer->indio_dev;
+}
+EXPORT_SYMBOL_GPL(iio_buffer_get_iio_dev);
+
 /**
  * iio_device_attach_buffer - Attach a buffer to a IIO device
  * @indio_dev: The device the buffer should be attached to
diff --git a/include/linux/iio/buffer.h b/include/linux/iio/buffer.h
index 8febc23f5f26..b27d8c81f32c 100644
--- a/include/linux/iio/buffer.h
+++ b/include/linux/iio/buffer.h
@@ -11,6 +11,8 @@
 
 struct iio_buffer;
 
+struct iio_dev *iio_buffer_get_iio_dev(struct iio_buffer *buffer);
+
 int iio_push_to_buffers(struct iio_dev *indio_dev, const void *data);
 
 /**
-- 
2.17.1