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From: Alexandru Ardelean <alexandru.ardelean@analog.com>
To: <linux-iio@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Cc: <lars@metafoo.de>, <jic23@kernel.org>,
	Alexandru Ardelean <alexandru.ardelean@analog.com>
Subject: [RFC PATCH 02/12] iio: buffer: add back-ref from iio_buffer to iio_dev
Date: Tue, 17 Nov 2020 18:23:30 +0200	[thread overview]
Message-ID: <20201117162340.43924-3-alexandru.ardelean@analog.com> (raw)
In-Reply-To: <20201117162340.43924-1-alexandru.ardelean@analog.com>

An IIO device will have multiple buffers, but it shouldn't be allowed that
an IIO buffer should belong to more than 1 IIO device.

Once things get moved more from IIO device to the IIO buffer, and an IIO
device will be able to have more than 1 buffer attached, there will be a
need for a back-ref to the IIO device [from the IIO buffer].

This change adds that.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 drivers/iio/industrialio-buffer.c | 2 ++
 include/linux/iio/buffer_impl.h   | 3 +++
 2 files changed, 5 insertions(+)

diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
index 9663dec3dcf3..08aa8e0782ce 100644
--- a/drivers/iio/industrialio-buffer.c
+++ b/drivers/iio/industrialio-buffer.c
@@ -1505,5 +1505,7 @@ void iio_device_attach_buffer(struct iio_dev *indio_dev,
 			      struct iio_buffer *buffer)
 {
 	indio_dev->buffer = iio_buffer_get(buffer);
+
+	indio_dev->buffer->indio_dev = indio_dev;
 }
 EXPORT_SYMBOL_GPL(iio_device_attach_buffer);
diff --git a/include/linux/iio/buffer_impl.h b/include/linux/iio/buffer_impl.h
index a63dc07b7350..67d73d465e02 100644
--- a/include/linux/iio/buffer_impl.h
+++ b/include/linux/iio/buffer_impl.h
@@ -69,6 +69,9 @@ struct iio_buffer_access_funcs {
  * those writing new buffer implementations.
  */
 struct iio_buffer {
+	/** @indio_dev: IIO device to which this buffer belongs to. */
+	struct iio_dev *indio_dev;
+
 	/** @length: Number of datums in buffer. */
 	unsigned int length;
 
-- 
2.17.1


  parent reply	other threads:[~2020-11-17 16:19 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-17 16:23 [RFC PATCH 00/12] iio: core,buffer: add support for multiple IIO buffers per IIO device Alexandru Ardelean
2020-11-17 16:23 ` [RFC PATCH 01/12] iio: core: register chardev only if needed Alexandru Ardelean
2020-11-21 18:02   ` Jonathan Cameron
2020-11-23 12:10     ` Alexandru Ardelean
2020-11-17 16:23 ` Alexandru Ardelean [this message]
2020-11-17 16:23 ` [RFC PATCH 03/12] iio: buffer: rework buffer & scan_elements dir creation Alexandru Ardelean
2020-11-21 18:24   ` Jonathan Cameron
2020-11-23 12:21     ` Alexandru Ardelean
2020-11-17 16:23 ` [RFC PATCH 04/12] iio: buffer: add index to the first IIO buffer dir and symlink it back Alexandru Ardelean
2020-11-21 18:27   ` Jonathan Cameron
2020-11-17 16:23 ` [RFC PATCH 05/12] iio: core: split __iio_device_attr_init() to init only the attr object Alexandru Ardelean
2020-11-17 16:23 ` [RFC PATCH 06/12] iio: buffer: re-route scan_elements via it's kobj_type Alexandru Ardelean
2020-11-21 18:33   ` Jonathan Cameron
2020-11-23 12:22     ` Alexandru Ardelean
2020-11-17 16:23 ` [RFC PATCH 07/12] iio: buffer: re-route core buffer attributes via it's new kobj_type Alexandru Ardelean
2020-11-17 16:23 ` [RFC PATCH 08/12] iio: buffer: add helper to get the IIO device to which a buffer belongs Alexandru Ardelean
2020-11-17 16:23 ` [RFC PATCH 09/12] iio: re-route all buffer attributes through new buffer kobj_type Alexandru Ardelean
2020-11-17 16:23 ` [RFC PATCH 10/12] iio: core: wrap iio device & buffer into struct for character devices Alexandru Ardelean
2020-11-17 16:23 ` [RFC PATCH 11/12] iio: buffer: introduce support for attaching more IIO buffers Alexandru Ardelean
2020-11-21 18:44   ` Jonathan Cameron
2020-11-23 12:27     ` Alexandru Ardelean
2020-11-17 16:23 ` [RFC PATCH 12/12] iio: buffer: add ioctl() to support opening extra buffers for IIO device Alexandru Ardelean
2020-11-21 18:50   ` Jonathan Cameron
2020-11-23 12:54     ` Alexandru Ardelean
2020-11-21 18:52 ` [RFC PATCH 00/12] iio: core,buffer: add support for multiple IIO buffers per " Jonathan Cameron
2020-11-23 13:03   ` Alexandru Ardelean

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