From: Paul Cercueil <paul@xxxxxxxxxxxxxxx>
Update the devm_iio_dmaengine_buffer_setup() function to support
specifying the buffer direction.
Update the iio_dmaengine_buffer_submit() function to handle input
buffers as well as output buffers.
Signed-off-by: Paul Cercueil <paul@xxxxxxxxxxxxxxx>
Reviewed-by: Alexandru Ardelean <ardeleanalex@xxxxxxxxx>
Signed-off-by: Nuno Sa <nuno.sa@xxxxxxxxxx>
---
drivers/iio/buffer/industrialio-buffer-dmaengine.c | 41 +++++++++++++++-------
include/linux/iio/buffer-dmaengine.h | 25 +++++++++----
2 files changed, 47 insertions(+), 19 deletions(-)
diff --git a/drivers/iio/buffer/industrialio-buffer-dmaengine.c b/drivers/iio/buffer/industrialio-buffer-dmaengine.c
index df05d66afff9..051e1758e020 100644
--- a/drivers/iio/buffer/industrialio-buffer-dmaengine.c
+++ b/drivers/iio/buffer/industrialio-buffer-dmaengine.c
@@ -64,14 +64,25 @@ static int iio_dmaengine_buffer_submit_block(struct iio_dma_buffer_queue *queue,
struct dmaengine_buffer *dmaengine_buffer =
iio_buffer_to_dmaengine_buffer(&queue->buffer);
struct dma_async_tx_descriptor *desc;
+ enum dma_transfer_direction dma_dir;
+ size_t max_size;
dma_cookie_t cookie;
- block->bytes_used = min(block->size, dmaengine_buffer->max_size);
- block->bytes_used = round_down(block->bytes_used,
- dmaengine_buffer->align);
+ max_size = min(block->size, dmaengine_buffer->max_size);
+ max_size = round_down(max_size, dmaengine_buffer->align);
+
+ if (queue->buffer.direction == IIO_BUFFER_DIRECTION_IN) {
+ block->bytes_used = max_size;
+ dma_dir = DMA_DEV_TO_MEM;
+ } else {
+ dma_dir = DMA_MEM_TO_DEV;
+ }
+
+ if (!block->bytes_used || block->bytes_used > max_size)
+ return -EINVAL;
desc = dmaengine_prep_slave_single(dmaengine_buffer->chan,
- block->phys_addr, block->bytes_used, DMA_DEV_TO_MEM,
+ block->phys_addr, block->bytes_used, dma_dir,
DMA_PREP_INTERRUPT);
if (!desc)
return -ENOMEM;
@@ -229,9 +240,10 @@ void iio_dmaengine_buffer_free(struct iio_buffer *buffer)
}
EXPORT_SYMBOL_NS_GPL(iio_dmaengine_buffer_free, IIO_DMAENGINE_BUFFER);
-struct iio_buffer *iio_dmaengine_buffer_setup(struct device *dev,
- struct iio_dev *indio_dev,
- const char *channel)
+struct iio_buffer *iio_dmaengine_buffer_setup_ext(struct device *dev,
+ struct iio_dev *indio_dev,
+ const char *channel,
+ enum iio_buffer_direction dir)
{
struct iio_buffer *buffer;
int ret;
@@ -242,6 +254,8 @@ struct iio_buffer *iio_dmaengine_buffer_setup(struct device *dev,
indio_dev->modes |= INDIO_BUFFER_HARDWARE;
+ buffer->direction = dir;
+
ret = iio_device_attach_buffer(indio_dev, buffer);
if (ret) {
iio_dmaengine_buffer_free(buffer);
@@ -250,7 +264,7 @@ struct iio_buffer *iio_dmaengine_buffer_setup(struct device *dev,
return buffer;
}
-EXPORT_SYMBOL_NS_GPL(iio_dmaengine_buffer_setup, IIO_DMAENGINE_BUFFER);
+EXPORT_SYMBOL_NS_GPL(iio_dmaengine_buffer_setup_ext, IIO_DMAENGINE_BUFFER);
static void __devm_iio_dmaengine_buffer_free(void *buffer)
{
@@ -268,20 +282,21 @@ static void __devm_iio_dmaengine_buffer_free(void *buffer)
* It also appends the INDIO_BUFFER_HARDWARE mode to the supported modes of the
* IIO device.
*/
-int devm_iio_dmaengine_buffer_setup(struct device *dev,
- struct iio_dev *indio_dev,
- const char *channel)
+int devm_iio_dmaengine_buffer_setup_ext(struct device *dev,
+ struct iio_dev *indio_dev,
+ const char *channel,
+ enum iio_buffer_direction dir)
{
struct iio_buffer *buffer;
- buffer = iio_dmaengine_buffer_setup(dev, indio_dev, channel);
+ buffer = iio_dmaengine_buffer_setup_ext(dev, indio_dev, channel, dir);
if (IS_ERR(buffer))
return PTR_ERR(buffer);
return devm_add_action_or_reset(dev, __devm_iio_dmaengine_buffer_free,
buffer);
}
-EXPORT_SYMBOL_NS_GPL(devm_iio_dmaengine_buffer_setup, IIO_DMAENGINE_BUFFER);
+EXPORT_SYMBOL_NS_GPL(devm_iio_dmaengine_buffer_setup_ext, IIO_DMAENGINE_BUFFER);
MODULE_AUTHOR("Lars-Peter Clausen <lars@xxxxxxxxxx>");
MODULE_DESCRIPTION("DMA buffer for the IIO framework");
diff --git a/include/linux/iio/buffer-dmaengine.h b/include/linux/iio/buffer-dmaengine.h
index acb60f9a3fff..81d9a19aeb91 100644
--- a/include/linux/iio/buffer-dmaengine.h
+++ b/include/linux/iio/buffer-dmaengine.h
@@ -7,15 +7,28 @@
#ifndef __IIO_DMAENGINE_H__
#define __IIO_DMAENGINE_H__
+#include <linux/iio/buffer.h>
+
struct iio_dev;
struct device;
void iio_dmaengine_buffer_free(struct iio_buffer *buffer);
-struct iio_buffer *iio_dmaengine_buffer_setup(struct device *dev,
- struct iio_dev *indio_dev,
- const char *channel);
-int devm_iio_dmaengine_buffer_setup(struct device *dev,
- struct iio_dev *indio_dev,
- const char *channel);
+struct iio_buffer *iio_dmaengine_buffer_setup_ext(struct device *dev,
+ struct iio_dev *indio_dev,
+ const char *channel,
+ enum iio_buffer_direction dir);
+
+#define iio_dmaengine_buffer_setup(dev, indio_dev, channel) \
+ iio_dmaengine_buffer_setup_ext(dev, indio_dev, channel, \
+ IIO_BUFFER_DIRECTION_IN)
+
+int devm_iio_dmaengine_buffer_setup_ext(struct device *dev,
+ struct iio_dev *indio_dev,
+ const char *channel,
+ enum iio_buffer_direction dir);
+
+#define devm_iio_dmaengine_buffer_setup(dev, indio_dev, channel) \
+ devm_iio_dmaengine_buffer_setup_ext(dev, indio_dev, channel, \
+ IIO_BUFFER_DIRECTION_IN)
#endif
--
2.44.0
