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-ASoC Platform Driver
-====================
-
-An ASoC platform driver can be divided into audio DMA and SoC DAI configuration
-and control. The platform drivers only target the SoC CPU and must have no board
-specific code.
-
-Audio DMA
-=========
-
-The platform DMA driver optionally supports the following ALSA operations:-
-
-/* SoC audio ops */
-struct snd_soc_ops {
- int (*startup)(struct snd_pcm_substream *);
- void (*shutdown)(struct snd_pcm_substream *);
- int (*hw_params)(struct snd_pcm_substream *, struct snd_pcm_hw_params *);
- int (*hw_free)(struct snd_pcm_substream *);
- int (*prepare)(struct snd_pcm_substream *);
- int (*trigger)(struct snd_pcm_substream *, int);
-};
-
-The platform driver exports its DMA functionality via struct
-snd_soc_platform_driver:-
-
-struct snd_soc_platform_driver {
- char *name;
-
- int (*probe)(struct platform_device *pdev);
- int (*remove)(struct platform_device *pdev);
- int (*suspend)(struct platform_device *pdev, struct snd_soc_cpu_dai *cpu_dai);
- int (*resume)(struct platform_device *pdev, struct snd_soc_cpu_dai *cpu_dai);
-
- /* pcm creation and destruction */
- int (*pcm_new)(struct snd_card *, struct snd_soc_codec_dai *, struct snd_pcm *);
- void (*pcm_free)(struct snd_pcm *);
-
- /*
- * For platform caused delay reporting.
- * Optional.
- */
- snd_pcm_sframes_t (*delay)(struct snd_pcm_substream *,
- struct snd_soc_dai *);
-
- /* platform stream ops */
- struct snd_pcm_ops *pcm_ops;
-};
-
-Please refer to the ALSA driver documentation for details of audio DMA.
-http://www.alsa-project.org/~iwai/writing-an-alsa-driver/
-
-An example DMA driver is soc/pxa/pxa2xx-pcm.c
-
-
-SoC DAI Drivers
-===============
-
-Each SoC DAI driver must provide the following features:-
-
- 1) Digital audio interface (DAI) description
- 2) Digital audio interface configuration
- 3) PCM's description
- 4) SYSCLK configuration
- 5) Suspend and resume (optional)
-
-Please see codec.txt for a description of items 1 - 4.