From: Alexandru Ardelean <alexandru.ardelean@analog.com>
To: <linux-kernel@vger.kernel.org>, <linux-iio@vger.kernel.org>
Cc: <lars@metafoo.de>, <Michael.Hennerich@analog.com>,
<jic23@kernel.org>, <nuno.sa@analog.com>,
<dragos.bogdan@analog.com>,
Alexandru Ardelean <alexandru.ardelean@analog.com>
Subject: [PATCH v2 02/12] iio: buffer: add back-ref from iio_buffer to iio_dev
Date: Fri, 22 Jan 2021 17:57:55 +0200 [thread overview]
Message-ID: <20210122155805.83012-3-alexandru.ardelean@analog.com> (raw)
In-Reply-To: <20210122155805.83012-1-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 2f7426a2f47c..0412c4fda4c1 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
next prev parent reply other threads:[~2021-01-22 17:41 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-22 15:57 [PATCH v2 00/12] iio: core,buffer: add support for multiple IIO buffers per IIO device Alexandru Ardelean
2021-01-22 15:57 ` [PATCH v2 01/12] iio: core: register chardev only if needed Alexandru Ardelean
2021-01-22 15:57 ` Alexandru Ardelean [this message]
2021-01-22 15:57 ` [PATCH v2 03/12] iio: buffer: rework buffer & scan_elements dir creation Alexandru Ardelean
2021-01-22 15:57 ` [PATCH v2 04/12] iio: buffer: add index to the first IIO buffer dir and symlink it back Alexandru Ardelean
2021-01-22 15:57 ` [PATCH v2 05/12] iio: core: split __iio_device_attr_init() to init only the attr object Alexandru Ardelean
2021-01-22 15:57 ` [PATCH v2 06/12] iio: buffer: re-route scan_elements via it's kobj_type Alexandru Ardelean
2021-01-22 16:12 ` Alexandru Ardelean
2021-01-22 15:58 ` [PATCH v2 07/12] iio: buffer: re-route core buffer attributes via it's new kobj_type Alexandru Ardelean
2021-01-22 15:58 ` [PATCH v2 08/12] iio: buffer: add helper to get the IIO device to which a buffer belongs Alexandru Ardelean
2021-01-22 15:58 ` [PATCH v2 09/12] iio: re-route all buffer attributes through new buffer kobj_type Alexandru Ardelean
2021-01-22 15:58 ` [PATCH v2 10/12] iio: core: wrap iio device & buffer into struct for character devices Alexandru Ardelean
2021-01-22 15:58 ` [PATCH v2 11/12] iio: buffer: introduce support for attaching more IIO buffers Alexandru Ardelean
2021-01-22 15:58 ` [PATCH v2 12/12] iio: buffer: add ioctl() to support opening extra buffers for IIO device Alexandru Ardelean
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