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iio: buffer-dmaengine: add devm_iio_dmaengine_buffer_setup_with_handle()

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Add a new devm_iio_dmaengine_buffer_setup_with_handle() function to
handle cases where the DMA channel is managed by the caller rather than
being requested and released by the iio_dmaengine module.

Reviewed-by: Nuno Sa <nuno.sa@analog.com>
Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://patch.msgid.link/20250207-dlech-mainline-spi-engine-offload-2-v8-9-e48a489be48c@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
David Lechner 2025-02-07 14:09:06 -06:00 committed by Jonathan Cameron
parent 4fe7fd17fe
commit 79f24971b4
2 changed files with 43 additions and 0 deletions
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38
drivers/iio/buffer/industrialio-buffer-dmaengine.c
View File

@ -380,6 +380,44 @@ int devm_iio_dmaengine_buffer_setup_ext(struct device *dev,
}
EXPORT_SYMBOL_NS_GPL(devm_iio_dmaengine_buffer_setup_ext, "IIO_DMAENGINE_BUFFER");
static void devm_iio_dmaengine_buffer_free(void *buffer)
{
iio_dmaengine_buffer_free(buffer);
}
/**
* devm_iio_dmaengine_buffer_setup_with_handle() - Setup a DMA buffer for an
* IIO device
* @dev: Device for devm ownership
* @indio_dev: IIO device to which to attach this buffer.
* @chan: DMA channel
* @dir: Direction of buffer (in or out)
*
* This allocates a new IIO buffer with devm_iio_dmaengine_buffer_alloc()
* and attaches it to an IIO device with iio_device_attach_buffer().
* It also appends the INDIO_BUFFER_HARDWARE mode to the supported modes of the
* IIO device.
*
* This is the same as devm_iio_dmaengine_buffer_setup_ext() except that the
* caller manages requesting and releasing the DMA channel handle.
*/
int devm_iio_dmaengine_buffer_setup_with_handle(struct device *dev,
struct iio_dev *indio_dev,
struct dma_chan *chan,
enum iio_buffer_direction dir)
{
struct iio_buffer *buffer;
buffer = __iio_dmaengine_buffer_setup_ext(indio_dev, chan, 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_with_handle,
"IIO_DMAENGINE_BUFFER");
MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
MODULE_DESCRIPTION("DMA buffer for the IIO framework");
MODULE_LICENSE("GPL");

5
include/linux/iio/buffer-dmaengine.h
View File

@ -11,6 +11,7 @@
struct iio_dev;
struct device;
struct dma_chan;
void iio_dmaengine_buffer_teardown(struct iio_buffer *buffer);
struct iio_buffer *iio_dmaengine_buffer_setup_ext(struct device *dev,
@ -26,6 +27,10 @@ int devm_iio_dmaengine_buffer_setup_ext(struct device *dev,
struct iio_dev *indio_dev,
const char *channel,
enum iio_buffer_direction dir);
int devm_iio_dmaengine_buffer_setup_with_handle(struct device *dev,
struct iio_dev *indio_dev,
struct dma_chan *chan,
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, \