18 #include <linux/iio/buffer.h>
20 #include <linux/iio/buffer-dma.h>
21 #include <linux/iio/buffer-dmaengine.h>
24  * The IIO DMAengine buffer combines the generic IIO DMA buffer infrastructure
25  * with the DMAengine framework. The generic IIO DMA buffer infrastructure is
26  * used to manage the buffer memory and implement the IIO buffer operations
28  * this results in a device independent fully functional DMA buffer
43 static struct dmaengine_buffer *iio_buffer_to_dmaengine_buffer(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()
63 		iio_buffer_to_dmaengine_buffer(&queue->buffer);  in iio_dmaengine_buffer_submit_block()
77 	if (queue->buffer.direction == IIO_BUFFER_DIRECTION_IN)  in iio_dmaengine_buffer_submit_block()
110 		if (queue->buffer.direction == IIO_BUFFER_DIRECTION_IN)  in iio_dmaengine_buffer_submit_block()
143 		iio_buffer_to_dmaengine_buffer(&queue->buffer);  in iio_dmaengine_buffer_abort()
191 	struct iio_buffer *buffer = to_iio_dev_attr(attr)->buffer;  in iio_dmaengine_buffer_get_length_align()  local
193 		iio_buffer_to_dmaengine_buffer(buffer);  in iio_dmaengine_buffer_get_length_align()
207  * iio_dmaengine_buffer_alloc() - Allocate new buffer which uses DMAengine
210  * This allocates a new IIO buffer which internally uses the DMAengine framework
213  * Once done using the buffer iio_dmaengine_buffer_free() should be used to
250 	dmaengine_buffer->queue.buffer.attrs = iio_dmaengine_buffer_attrs;  in iio_dmaengine_buffer_alloc()
251 	dmaengine_buffer->queue.buffer.access = &iio_dmaengine_buffer_ops;  in iio_dmaengine_buffer_alloc()
253 	return &dmaengine_buffer->queue.buffer;  in iio_dmaengine_buffer_alloc()
257  * iio_dmaengine_buffer_free() - Free dmaengine buffer
258  * @buffer: Buffer to free
260  * Frees a buffer previously allocated with iio_dmaengine_buffer_alloc().
262 static void iio_dmaengine_buffer_free(struct iio_buffer *buffer)  in iio_dmaengine_buffer_free()  argument
265 		iio_buffer_to_dmaengine_buffer(buffer);  in iio_dmaengine_buffer_free()
268 	iio_buffer_put(buffer);  in iio_dmaengine_buffer_free()
272  * iio_dmaengine_buffer_teardown() - Releases DMA channel and frees buffer
273  * @buffer: Buffer to free
275  * Releases the DMA channel and frees the buffer previously setup with
278 void iio_dmaengine_buffer_teardown(struct iio_buffer *buffer)  in iio_dmaengine_buffer_teardown()  argument
281 		iio_buffer_to_dmaengine_buffer(buffer);  in iio_dmaengine_buffer_teardown()
284 	iio_dmaengine_buffer_free(buffer);  in iio_dmaengine_buffer_teardown()
294 	struct iio_buffer *buffer;  in __iio_dmaengine_buffer_setup_ext()  local
297 	buffer = iio_dmaengine_buffer_alloc(chan);  in __iio_dmaengine_buffer_setup_ext()
298 	if (IS_ERR(buffer))  in __iio_dmaengine_buffer_setup_ext()
299 		return ERR_CAST(buffer);  in __iio_dmaengine_buffer_setup_ext()
303 	buffer->direction = dir;  in __iio_dmaengine_buffer_setup_ext()
305 	ret = iio_device_attach_buffer(indio_dev, buffer);  in __iio_dmaengine_buffer_setup_ext()
307 		iio_dmaengine_buffer_free(buffer);  in __iio_dmaengine_buffer_setup_ext()
311 	return buffer;  in __iio_dmaengine_buffer_setup_ext()
315  * iio_dmaengine_buffer_setup_ext() - Setup a DMA buffer for an IIO device
317  * @indio_dev: IIO device to which to attach this buffer.
319  * @dir: Direction of buffer (in or out)
321  * This allocates a new IIO buffer with devm_iio_dmaengine_buffer_alloc()
326  * Once done using the buffer iio_dmaengine_buffer_teardown() should be used to
335 	struct iio_buffer *buffer;  in iio_dmaengine_buffer_setup_ext()  local
341 	buffer = __iio_dmaengine_buffer_setup_ext(indio_dev, chan, dir);  in iio_dmaengine_buffer_setup_ext()
342 	if (IS_ERR(buffer))  in iio_dmaengine_buffer_setup_ext()
345 	return buffer;  in iio_dmaengine_buffer_setup_ext()
349 static void devm_iio_dmaengine_buffer_teardown(void *buffer)  in devm_iio_dmaengine_buffer_teardown()  argument
351 	iio_dmaengine_buffer_teardown(buffer);  in devm_iio_dmaengine_buffer_teardown()
355  * devm_iio_dmaengine_buffer_setup_ext() - Setup a DMA buffer for an IIO device
357  * @indio_dev: IIO device to which to attach this buffer.
359  * @dir: Direction of buffer (in or out)
361  * This allocates a new IIO buffer with devm_iio_dmaengine_buffer_alloc()
371 	struct iio_buffer *buffer;  in devm_iio_dmaengine_buffer_setup_ext()  local
373 	buffer = iio_dmaengine_buffer_setup_ext(dev, indio_dev, channel, dir);  in devm_iio_dmaengine_buffer_setup_ext()
374 	if (IS_ERR(buffer))  in devm_iio_dmaengine_buffer_setup_ext()
375 		return PTR_ERR(buffer);  in devm_iio_dmaengine_buffer_setup_ext()
378 					buffer);  in devm_iio_dmaengine_buffer_setup_ext()
382 static void devm_iio_dmaengine_buffer_free(void *buffer)  in devm_iio_dmaengine_buffer_free()  argument
384 	iio_dmaengine_buffer_free(buffer);  in devm_iio_dmaengine_buffer_free()
388  * devm_iio_dmaengine_buffer_setup_with_handle() - Setup a DMA buffer for an
391  * @indio_dev: IIO device to which to attach this buffer.
393  * @dir: Direction of buffer (in or out)
395  * This allocates a new IIO buffer with devm_iio_dmaengine_buffer_alloc()
408 	struct iio_buffer *buffer;  in devm_iio_dmaengine_buffer_setup_with_handle()  local
410 	buffer = __iio_dmaengine_buffer_setup_ext(indio_dev, chan, dir);  in devm_iio_dmaengine_buffer_setup_with_handle()
411 	if (IS_ERR(buffer))  in devm_iio_dmaengine_buffer_setup_with_handle()
412 		return PTR_ERR(buffer);  in devm_iio_dmaengine_buffer_setup_with_handle()
415 					buffer);  in devm_iio_dmaengine_buffer_setup_with_handle()
421 MODULE_DESCRIPTION("DMA buffer for the IIO framework");