diff options
Diffstat (limited to 'Documentation/sound/alsa/soc/platform.txt')
| -rw-r--r-- | Documentation/sound/alsa/soc/platform.txt | 66 |
1 files changed, 0 insertions, 66 deletions
diff --git a/Documentation/sound/alsa/soc/platform.txt b/Documentation/sound/alsa/soc/platform.txt deleted file mode 100644 index d57efad..0000000 --- a/Documentation/sound/alsa/soc/platform.txt +++ /dev/null @@ -1,66 +0,0 @@ -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. |