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iio: buffer-dmaengine: add dev-managed calls for buffer alloc
Currently, when using a 'iio_dmaengine_buffer_alloc()', an matching call to 'iio_dmaengine_buffer_free()' must be made. With this change, this can be avoided by using 'devm_iio_dmaengine_buffer_alloc()'. The buffer will get free'd via the device's devres handling. Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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2 changed files with 42 additions and 0 deletions
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@ -229,6 +229,45 @@ void iio_dmaengine_buffer_free(struct iio_buffer *buffer)
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}
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EXPORT_SYMBOL_GPL(iio_dmaengine_buffer_free);
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static void __devm_iio_dmaengine_buffer_free(struct device *dev, void *res)
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{
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iio_dmaengine_buffer_free(*(struct iio_buffer **)res);
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}
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/**
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* devm_iio_dmaengine_buffer_alloc() - Resource-managed iio_dmaengine_buffer_alloc()
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* @dev: Parent device for the buffer
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* @channel: DMA channel name, typically "rx".
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*
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* This allocates a new IIO buffer which internally uses the DMAengine framework
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* to perform its transfers. The parent device will be used to request the DMA
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* channel.
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*
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* The buffer will be automatically de-allocated once the device gets destroyed.
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*/
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struct iio_buffer *devm_iio_dmaengine_buffer_alloc(struct device *dev,
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const char *channel)
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{
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struct iio_buffer **bufferp, *buffer;
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bufferp = devres_alloc(__devm_iio_dmaengine_buffer_free,
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sizeof(*bufferp), GFP_KERNEL);
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if (!bufferp)
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return ERR_PTR(-ENOMEM);
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buffer = iio_dmaengine_buffer_alloc(dev, channel);
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if (IS_ERR(buffer)) {
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devres_free(bufferp);
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return buffer;
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}
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*bufferp = buffer;
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devres_add(dev, bufferp);
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return buffer;
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}
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EXPORT_SYMBOL_GPL(devm_iio_dmaengine_buffer_alloc);
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MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
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MODULE_DESCRIPTION("DMA buffer for the IIO framework");
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MODULE_LICENSE("GPL");
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@ -14,4 +14,7 @@ struct iio_buffer *iio_dmaengine_buffer_alloc(struct device *dev,
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const char *channel);
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void iio_dmaengine_buffer_free(struct iio_buffer *buffer);
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struct iio_buffer *devm_iio_dmaengine_buffer_alloc(struct device *dev,
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const char *channel);
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#endif
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