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()
194 	struct iio_buffer *buffer = to_iio_dev_attr(attr)->buffer;  in iio_dmaengine_buffer_get_length_align()  local
196 		iio_buffer_to_dmaengine_buffer(buffer);  in iio_dmaengine_buffer_get_length_align()
210  * iio_dmaengine_buffer_alloc() - Allocate new buffer which uses DMAengine
213  * 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
253 	dmaengine_buffer->queue.buffer.attrs = iio_dmaengine_buffer_attrs;  in iio_dmaengine_buffer_alloc()
254 	dmaengine_buffer->queue.buffer.access = &iio_dmaengine_buffer_ops;  in iio_dmaengine_buffer_alloc()
256 	return &dmaengine_buffer->queue.buffer;  in iio_dmaengine_buffer_alloc()
260  * iio_dmaengine_buffer_free() - Free dmaengine buffer
261  * @buffer: Buffer to free
263  * Frees a buffer previously allocated with iio_dmaengine_buffer_alloc().
265 static void iio_dmaengine_buffer_free(struct iio_buffer *buffer)  in iio_dmaengine_buffer_free()  argument
268 		iio_buffer_to_dmaengine_buffer(buffer);  in iio_dmaengine_buffer_free()
271 	iio_buffer_put(buffer);  in iio_dmaengine_buffer_free()
275  * iio_dmaengine_buffer_teardown() - Releases DMA channel and frees buffer
276  * @buffer: Buffer to free
278  * Releases the DMA channel and frees the buffer previously setup with
281 void iio_dmaengine_buffer_teardown(struct iio_buffer *buffer)  in iio_dmaengine_buffer_teardown()  argument
284 		iio_buffer_to_dmaengine_buffer(buffer);  in iio_dmaengine_buffer_teardown()
287 	iio_dmaengine_buffer_free(buffer);  in iio_dmaengine_buffer_teardown()
297 	struct iio_buffer *buffer;  in __iio_dmaengine_buffer_setup_ext()  local
300 	buffer = iio_dmaengine_buffer_alloc(chan);  in __iio_dmaengine_buffer_setup_ext()
301 	if (IS_ERR(buffer))  in __iio_dmaengine_buffer_setup_ext()
302 		return ERR_CAST(buffer);  in __iio_dmaengine_buffer_setup_ext()
306 	buffer->direction = dir;  in __iio_dmaengine_buffer_setup_ext()
308 	ret = iio_device_attach_buffer(indio_dev, buffer);  in __iio_dmaengine_buffer_setup_ext()
310 		iio_dmaengine_buffer_free(buffer);  in __iio_dmaengine_buffer_setup_ext()
314 	return buffer;  in __iio_dmaengine_buffer_setup_ext()
318  * iio_dmaengine_buffer_setup_ext() - Setup a DMA buffer for an IIO device
320  * @indio_dev: IIO device to which to attach this buffer.
322  * @dir: Direction of buffer (in or out)
324  * This allocates a new IIO buffer with devm_iio_dmaengine_buffer_alloc()
329  * Once done using the buffer iio_dmaengine_buffer_teardown() should be used to
338 	struct iio_buffer *buffer;  in iio_dmaengine_buffer_setup_ext()  local
344 	buffer = __iio_dmaengine_buffer_setup_ext(indio_dev, chan, dir);  in iio_dmaengine_buffer_setup_ext()
345 	if (IS_ERR(buffer))  in iio_dmaengine_buffer_setup_ext()
348 	return buffer;  in iio_dmaengine_buffer_setup_ext()
352 static void devm_iio_dmaengine_buffer_teardown(void *buffer)  in devm_iio_dmaengine_buffer_teardown()  argument
354 	iio_dmaengine_buffer_teardown(buffer);  in devm_iio_dmaengine_buffer_teardown()
358  * devm_iio_dmaengine_buffer_setup_ext() - Setup a DMA buffer for an IIO device
360  * @indio_dev: IIO device to which to attach this buffer.
362  * @dir: Direction of buffer (in or out)
364  * This allocates a new IIO buffer with devm_iio_dmaengine_buffer_alloc()
374 	struct iio_buffer *buffer;  in devm_iio_dmaengine_buffer_setup_ext()  local
376 	buffer = iio_dmaengine_buffer_setup_ext(dev, indio_dev, channel, dir);  in devm_iio_dmaengine_buffer_setup_ext()
377 	if (IS_ERR(buffer))  in devm_iio_dmaengine_buffer_setup_ext()
378 		return PTR_ERR(buffer);  in devm_iio_dmaengine_buffer_setup_ext()
381 					buffer);  in devm_iio_dmaengine_buffer_setup_ext()
385 static void devm_iio_dmaengine_buffer_free(void *buffer)  in devm_iio_dmaengine_buffer_free()  argument
387 	iio_dmaengine_buffer_free(buffer);  in devm_iio_dmaengine_buffer_free()
391  * devm_iio_dmaengine_buffer_setup_with_handle() - Setup a DMA buffer for an
394  * @indio_dev: IIO device to which to attach this buffer.
396  * @dir: Direction of buffer (in or out)
398  * This allocates a new IIO buffer with devm_iio_dmaengine_buffer_alloc()
411 	struct iio_buffer *buffer;  in devm_iio_dmaengine_buffer_setup_with_handle()  local
413 	buffer = __iio_dmaengine_buffer_setup_ext(indio_dev, chan, dir);  in devm_iio_dmaengine_buffer_setup_with_handle()
414 	if (IS_ERR(buffer))  in devm_iio_dmaengine_buffer_setup_with_handle()
415 		return PTR_ERR(buffer);  in devm_iio_dmaengine_buffer_setup_with_handle()
418 					buffer);  in devm_iio_dmaengine_buffer_setup_with_handle()
424 MODULE_DESCRIPTION("DMA buffer for the IIO framework");