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@crapouillou.net --- drivers/iio/adc/adi-axi-adc.c | 3 ++- .../buffer/industrialio-buffer-dmaengine.c | 24 +++++++++++++++---- include/linux/iio/buffer-dmaengine.h | 5 +++- 3 files changed, 25 insertions(+), 7 deletions(-)
diff --git a/drivers/iio/adc/adi-axi-adc.c b/drivers/iio/adc/adi-axi-adc.c index a73e3c2d212f..0a6f2c32b1b9 100644 --- a/drivers/iio/adc/adi-axi-adc.c +++ b/drivers/iio/adc/adi-axi-adc.c @@ -113,7 +113,8 @@ static int adi_axi_adc_config_dma_buffer(struct device *dev, dma_name = "rx";
return devm_iio_dmaengine_buffer_setup(indio_dev->dev.parent, - indio_dev, dma_name); + indio_dev, dma_name, + IIO_BUFFER_DIRECTION_IN); }
static int adi_axi_adc_read_raw(struct iio_dev *indio_dev, diff --git a/drivers/iio/buffer/industrialio-buffer-dmaengine.c b/drivers/iio/buffer/industrialio-buffer-dmaengine.c index f8ce26a24c57..ac26b04aa4a9 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; @@ -275,7 +286,8 @@ static struct iio_buffer *devm_iio_dmaengine_buffer_alloc(struct device *dev, */ int devm_iio_dmaengine_buffer_setup(struct device *dev, struct iio_dev *indio_dev, - const char *channel) + const char *channel, + enum iio_buffer_direction dir) { struct iio_buffer *buffer;
@@ -286,6 +298,8 @@ int devm_iio_dmaengine_buffer_setup(struct device *dev,
indio_dev->modes |= INDIO_BUFFER_HARDWARE;
+ buffer->direction = dir; + return iio_device_attach_buffer(indio_dev, buffer); } EXPORT_SYMBOL_GPL(devm_iio_dmaengine_buffer_setup); diff --git a/include/linux/iio/buffer-dmaengine.h b/include/linux/iio/buffer-dmaengine.h index 5c355be89814..538d0479cdd6 100644 --- a/include/linux/iio/buffer-dmaengine.h +++ b/include/linux/iio/buffer-dmaengine.h @@ -7,11 +7,14 @@ #ifndef __IIO_DMAENGINE_H__ #define __IIO_DMAENGINE_H__
+#include <linux/iio/buffer.h> + struct iio_dev; struct device;
int devm_iio_dmaengine_buffer_setup(struct device *dev, struct iio_dev *indio_dev, - const char *channel); + const char *channel, + enum iio_buffer_direction dir);
#endif