linux-kernel - [PATCH 10/13] iio: buffer: dmaengine: export devm_iio_dmaengine_buffer

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Date: Wed, 10 Jan 2024 13:49:51 -0600
From: David Lechner <dlechner@...libre.com>
To: Mark Brown <broonie@...nel.org>,
	Jonathan Cameron <jic23@...nel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Michael Hennerich <michael.hennerich@...log.com>,
	Nuno Sá <nuno.sa@...log.com>,
	Frank Rowand <frowand.list@...il.com>
Cc: David Lechner <dlechner@...libre.com>,
	Thierry Reding <thierry.reding@...il.com>,
	Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
	Jonathan Corbet <corbet@....net>,
	linux-spi@...r.kernel.org,
	linux-iio@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-doc@...r.kernel.org,
	linux-pwm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 10/13] iio: buffer: dmaengine: export devm_iio_dmaengine_buffer_alloc()

This changes devm_iio_dmaengine_buffer_alloc() to an exported symbol.
This will be used by drivers that need to allocate a DMA buffer without
attaching it to an IIO device.

Signed-off-by: David Lechner <dlechner@...libre.com>
---
 Documentation/driver-api/driver-model/devres.rst   |  1 +
 drivers/iio/buffer/Kconfig                         | 14 +++++++-------
 drivers/iio/buffer/industrialio-buffer-dmaengine.c |  3 ++-
 include/linux/iio/buffer-dmaengine.h               |  2 ++
 4 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/Documentation/driver-api/driver-model/devres.rst b/Documentation/driver-api/driver-model/devres.rst
index b23d4a2b68a6..60e4b7ba38e5 100644
--- a/Documentation/driver-api/driver-model/devres.rst
+++ b/Documentation/driver-api/driver-model/devres.rst
@@ -285,6 +285,7 @@ I2C
 IIO
   devm_iio_device_alloc()
   devm_iio_device_register()
+  devm_iio_dmaengine_buffer_alloc()
   devm_iio_dmaengine_buffer_setup()
   devm_iio_kfifo_buffer_setup()
   devm_iio_kfifo_buffer_setup_ext()
diff --git a/drivers/iio/buffer/Kconfig b/drivers/iio/buffer/Kconfig
index 925c5bf074bc..27d82fb4bc4d 100644
--- a/drivers/iio/buffer/Kconfig
+++ b/drivers/iio/buffer/Kconfig
@@ -40,6 +40,13 @@ config IIO_BUFFER_HW_CONSUMER
 	  Should be selected by drivers that want to use the generic Hw consumer
 	  interface.
 
+config IIO_HW_TRIGGERED_BUFFER
+	tristate "Industrial I/O hardware triggered buffer support"
+	select AUXILIARY_BUS
+	select IIO_TRIGGER
+	help
+	  Provides helper functions for setting up hardware triggered buffers.
+
 config IIO_KFIFO_BUF
 	tristate "Industrial I/O buffering based on kfifo"
 	help
@@ -53,10 +60,3 @@ config IIO_TRIGGERED_BUFFER
 	select IIO_KFIFO_BUF
 	help
 	  Provides helper functions for setting up triggered buffers.
-
-config IIO_HW_TRIGGERED_BUFFER
-	tristate "Industrial I/O hardware triggered buffer support"
-	select AUXILIARY_BUS
-	select IIO_TRIGGER
-	help
-	  Provides helper functions for setting up hardware triggered buffers.
diff --git a/drivers/iio/buffer/industrialio-buffer-dmaengine.c b/drivers/iio/buffer/industrialio-buffer-dmaengine.c
index c67ddf963bfb..03225939f223 100644
--- a/drivers/iio/buffer/industrialio-buffer-dmaengine.c
+++ b/drivers/iio/buffer/industrialio-buffer-dmaengine.c
@@ -244,7 +244,7 @@ static void __devm_iio_dmaengine_buffer_free(void *buffer)
  *
  * The buffer will be automatically de-allocated once the device gets destroyed.
  */
-static struct iio_buffer *devm_iio_dmaengine_buffer_alloc(struct device *dev,
+struct iio_buffer *devm_iio_dmaengine_buffer_alloc(struct device *dev,
 	const char *channel)
 {
 	struct iio_buffer *buffer;
@@ -261,6 +261,7 @@ static struct iio_buffer *devm_iio_dmaengine_buffer_alloc(struct device *dev,
 
 	return buffer;
 }
+EXPORT_SYMBOL_GPL(devm_iio_dmaengine_buffer_alloc);
 
 /**
  * devm_iio_dmaengine_buffer_setup() - Setup a DMA buffer for an IIO device
diff --git a/include/linux/iio/buffer-dmaengine.h b/include/linux/iio/buffer-dmaengine.h
index 5c355be89814..3ac616ddf5b9 100644
--- a/include/linux/iio/buffer-dmaengine.h
+++ b/include/linux/iio/buffer-dmaengine.h
@@ -10,6 +10,8 @@
 struct iio_dev;
 struct device;
 
+struct iio_buffer *devm_iio_dmaengine_buffer_alloc(struct device *dev,
+						   const char *channel);
 int devm_iio_dmaengine_buffer_setup(struct device *dev,
 				    struct iio_dev *indio_dev,
 				    const char *channel);

-- 
2.43.0