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
211  * This allocates a new IIO buffer which internally uses the DMAengine framework
214  * Once done using the buffer iio_dmaengine_buffer_free() should be used to
251 	dmaengine_buffer->queue.buffer.attrs = iio_dmaengine_buffer_attrs;  in iio_dmaengine_buffer_alloc()
252 	dmaengine_buffer->queue.buffer.access = &iio_dmaengine_buffer_ops;  in iio_dmaengine_buffer_alloc()
254 	return &dmaengine_buffer->queue.buffer;  in iio_dmaengine_buffer_alloc()
258  * iio_dmaengine_buffer_free() - Free dmaengine buffer
259  * @buffer: Buffer to free
261  * Frees a buffer previously allocated with iio_dmaengine_buffer_alloc().
263 static void iio_dmaengine_buffer_free(struct iio_buffer *buffer)  in iio_dmaengine_buffer_free()  argument
266 		iio_buffer_to_dmaengine_buffer(buffer);  in iio_dmaengine_buffer_free()
269 	iio_buffer_put(buffer);  in iio_dmaengine_buffer_free()
273  * iio_dmaengine_buffer_teardown() - Releases DMA channel and frees buffer
274  * @buffer: Buffer to free
276  * Releases the DMA channel and frees the buffer previously setup with
279 void iio_dmaengine_buffer_teardown(struct iio_buffer *buffer)  in iio_dmaengine_buffer_teardown()  argument
282 		iio_buffer_to_dmaengine_buffer(buffer);  in iio_dmaengine_buffer_teardown()
285 	iio_dmaengine_buffer_free(buffer);  in iio_dmaengine_buffer_teardown()
295 	struct iio_buffer *buffer;  in __iio_dmaengine_buffer_setup_ext()  local
298 	buffer = iio_dmaengine_buffer_alloc(chan);  in __iio_dmaengine_buffer_setup_ext()
299 	if (IS_ERR(buffer))  in __iio_dmaengine_buffer_setup_ext()
300 		return ERR_CAST(buffer);  in __iio_dmaengine_buffer_setup_ext()
304 	buffer->direction = dir;  in __iio_dmaengine_buffer_setup_ext()
306 	ret = iio_device_attach_buffer(indio_dev, buffer);  in __iio_dmaengine_buffer_setup_ext()
308 		iio_dmaengine_buffer_free(buffer);  in __iio_dmaengine_buffer_setup_ext()
312 	return buffer;  in __iio_dmaengine_buffer_setup_ext()
316  * iio_dmaengine_buffer_setup_ext() - Setup a DMA buffer for an IIO device
318  * @indio_dev: IIO device to which to attach this buffer.
320  * @dir: Direction of buffer (in or out)
322  * This allocates a new IIO buffer with devm_iio_dmaengine_buffer_alloc()
327  * Once done using the buffer iio_dmaengine_buffer_teardown() should be used to
336 	struct iio_buffer *buffer;  in iio_dmaengine_buffer_setup_ext()  local
342 	buffer = __iio_dmaengine_buffer_setup_ext(indio_dev, chan, dir);  in iio_dmaengine_buffer_setup_ext()
343 	if (IS_ERR(buffer))  in iio_dmaengine_buffer_setup_ext()
346 	return buffer;  in iio_dmaengine_buffer_setup_ext()
350 static void devm_iio_dmaengine_buffer_teardown(void *buffer)  in devm_iio_dmaengine_buffer_teardown()  argument
352 	iio_dmaengine_buffer_teardown(buffer);  in devm_iio_dmaengine_buffer_teardown()
356  * devm_iio_dmaengine_buffer_setup_ext() - Setup a DMA buffer for an IIO device
358  * @indio_dev: IIO device to which to attach this buffer.
360  * @dir: Direction of buffer (in or out)
362  * This allocates a new IIO buffer with devm_iio_dmaengine_buffer_alloc()
372 	struct iio_buffer *buffer;  in devm_iio_dmaengine_buffer_setup_ext()  local
374 	buffer = iio_dmaengine_buffer_setup_ext(dev, indio_dev, channel, dir);  in devm_iio_dmaengine_buffer_setup_ext()
375 	if (IS_ERR(buffer))  in devm_iio_dmaengine_buffer_setup_ext()
376 		return PTR_ERR(buffer);  in devm_iio_dmaengine_buffer_setup_ext()
379 					buffer);  in devm_iio_dmaengine_buffer_setup_ext()
383 static void devm_iio_dmaengine_buffer_free(void *buffer)  in devm_iio_dmaengine_buffer_free()  argument
385 	iio_dmaengine_buffer_free(buffer);  in devm_iio_dmaengine_buffer_free()
389  * devm_iio_dmaengine_buffer_setup_with_handle() - Setup a DMA buffer for an
392  * @indio_dev: IIO device to which to attach this buffer.
394  * @dir: Direction of buffer (in or out)
396  * This allocates a new IIO buffer with devm_iio_dmaengine_buffer_alloc()
409 	struct iio_buffer *buffer;  in devm_iio_dmaengine_buffer_setup_with_handle()  local
411 	buffer = __iio_dmaengine_buffer_setup_ext(indio_dev, chan, dir);  in devm_iio_dmaengine_buffer_setup_with_handle()
412 	if (IS_ERR(buffer))  in devm_iio_dmaengine_buffer_setup_with_handle()
413 		return PTR_ERR(buffer);  in devm_iio_dmaengine_buffer_setup_with_handle()
416 					buffer);  in devm_iio_dmaengine_buffer_setup_with_handle()
422 MODULE_DESCRIPTION("DMA buffer for the IIO framework");