imx-pcm-dma.c 1.2 KB

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  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * imx-pcm-dma-mx2.c -- ALSA Soc Audio Layer
  4. *
  5. * Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
  6. *
  7. * This code is based on code copyrighted by Freescale,
  8. * Liam Girdwood, Javier Martin and probably others.
  9. */
  10. #include <linux/platform_device.h>
  11. #include <linux/dmaengine.h>
  12. #include <linux/types.h>
  13. #include <linux/module.h>
  14. #include <sound/core.h>
  15. #include <sound/pcm.h>
  16. #include <sound/soc.h>
  17. #include <sound/dmaengine_pcm.h>
  18. #include "imx-pcm.h"
  19. static bool filter(struct dma_chan *chan, void *param)
  20. {
  21. if (!imx_dma_is_general_purpose(chan))
  22. return false;
  23. chan->private = param;
  24. return true;
  25. }
  26. static const struct snd_dmaengine_pcm_config imx_dmaengine_pcm_config = {
  27. .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
  28. .compat_filter_fn = filter,
  29. };
  30. int imx_pcm_dma_init(struct platform_device *pdev, size_t size)
  31. {
  32. struct snd_dmaengine_pcm_config *config;
  33. config = devm_kzalloc(&pdev->dev,
  34. sizeof(struct snd_dmaengine_pcm_config), GFP_KERNEL);
  35. if (!config)
  36. return -ENOMEM;
  37. *config = imx_dmaengine_pcm_config;
  38. return devm_snd_dmaengine_pcm_register(&pdev->dev,
  39. config,
  40. SND_DMAENGINE_PCM_FLAG_COMPAT);
  41. }
  42. EXPORT_SYMBOL_GPL(imx_pcm_dma_init);
  43. MODULE_LICENSE("GPL");