17 #include <linux/iio/buffer.h>
19 #include <linux/iio/buffer-dma.h>
20 #include <linux/iio/buffer-dmaengine.h>
23  * The IIO DMAengine buffer combines the generic IIO DMA buffer infrastructure
24  * with the DMAengine framework. The generic IIO DMA buffer infrastructure is
25  * used to manage the buffer memory and implement the IIO buffer operations
27  * this results in a device independent fully functional DMA buffer
43 		struct iio_buffer *buffer)  in iio_buffer_to_dmaengine_buffer()  argument
45 	return container_of(buffer, struct dmaengine_buffer, queue.buffer);  in iio_buffer_to_dmaengine_buffer()
65 		iio_buffer_to_dmaengine_buffer(&queue->buffer);  in iio_dmaengine_buffer_submit_block()
79 	if (queue->buffer.direction == IIO_BUFFER_DIRECTION_IN)  in iio_dmaengine_buffer_submit_block()
112 		if (queue->buffer.direction == IIO_BUFFER_DIRECTION_IN)  in iio_dmaengine_buffer_submit_block()
146 		iio_buffer_to_dmaengine_buffer(&queue->buffer);  in iio_dmaengine_buffer_abort()
192 	struct iio_buffer *buffer = to_iio_dev_attr(attr)->buffer;  in iio_dmaengine_buffer_get_length_align()  local
194 		iio_buffer_to_dmaengine_buffer(buffer);  in iio_dmaengine_buffer_get_length_align()
208  * iio_dmaengine_buffer_alloc() - Allocate new buffer which uses DMAengine
212  * This allocates a new IIO buffer which internally uses the DMAengine framework
216  * Once done using the buffer iio_dmaengine_buffer_free() should be used to
261 	dmaengine_buffer->queue.buffer.attrs = iio_dmaengine_buffer_attrs;  in iio_dmaengine_buffer_alloc()
262 	dmaengine_buffer->queue.buffer.access = &iio_dmaengine_buffer_ops;  in iio_dmaengine_buffer_alloc()
264 	return &dmaengine_buffer->queue.buffer;  in iio_dmaengine_buffer_alloc()
274  * iio_dmaengine_buffer_free() - Free dmaengine buffer
275  * @buffer: Buffer to free
277  * Frees a buffer previously allocated with iio_dmaengine_buffer_alloc().
279 void iio_dmaengine_buffer_free(struct iio_buffer *buffer)  in iio_dmaengine_buffer_free()  argument
282 		iio_buffer_to_dmaengine_buffer(buffer);  in iio_dmaengine_buffer_free()
287 	iio_buffer_put(buffer);  in iio_dmaengine_buffer_free()
292  * iio_dmaengine_buffer_setup_ext() - Setup a DMA buffer for an IIO device
294  * @indio_dev: IIO device to which to attach this buffer.
296  * @dir: Direction of buffer (in or out)
298  * This allocates a new IIO buffer with devm_iio_dmaengine_buffer_alloc()
303  * Once done using the buffer iio_dmaengine_buffer_free() should be used to
311 	struct iio_buffer *buffer;  in iio_dmaengine_buffer_setup_ext()  local
314 	buffer = iio_dmaengine_buffer_alloc(dev, channel);  in iio_dmaengine_buffer_setup_ext()
315 	if (IS_ERR(buffer))  in iio_dmaengine_buffer_setup_ext()
316 		return ERR_CAST(buffer);  in iio_dmaengine_buffer_setup_ext()
320 	buffer->direction = dir;  in iio_dmaengine_buffer_setup_ext()
322 	ret = iio_device_attach_buffer(indio_dev, buffer);  in iio_dmaengine_buffer_setup_ext()
324 		iio_dmaengine_buffer_free(buffer);  in iio_dmaengine_buffer_setup_ext()
328 	return buffer;  in iio_dmaengine_buffer_setup_ext()
332 static void __devm_iio_dmaengine_buffer_free(void *buffer)  in __devm_iio_dmaengine_buffer_free()  argument
334 	iio_dmaengine_buffer_free(buffer);  in __devm_iio_dmaengine_buffer_free()
338  * devm_iio_dmaengine_buffer_setup_ext() - Setup a DMA buffer for an IIO device
340  * @indio_dev: IIO device to which to attach this buffer.
342  * @dir: Direction of buffer (in or out)
344  * This allocates a new IIO buffer with devm_iio_dmaengine_buffer_alloc()
354 	struct iio_buffer *buffer;  in devm_iio_dmaengine_buffer_setup_ext()  local
356 	buffer = iio_dmaengine_buffer_setup_ext(dev, indio_dev, channel, dir);  in devm_iio_dmaengine_buffer_setup_ext()
357 	if (IS_ERR(buffer))  in devm_iio_dmaengine_buffer_setup_ext()
358 		return PTR_ERR(buffer);  in devm_iio_dmaengine_buffer_setup_ext()
361 					buffer);  in devm_iio_dmaengine_buffer_setup_ext()
366 MODULE_DESCRIPTION("DMA buffer for the IIO framework");