Hi3798 Alsa 驱动分析

1：文件

aiao_v1_1/alsa/dsp_mix_v2/alsa_aiao_proc_func.c
aiao_v1_1/alsa/dsp_mix_v2/drv_ao_func.c
aiao_v1_1/alsa/dsp_mix_v2/hiaiao_card.c
aiao_v1_1/alsa/dsp_mix_v2/hiaiao_i2s.c
aiao_v1_1/alsa/dsp_mix_v2/hiaiao_dma.c
aiao_v1_1/alsa/dsp_mix_v2/drv_ai_func.o
aiao_v1_1/alsa/dsp_mix_v2/alsa_aiao_volume_func.o
aiao_v1_1/alsa/dsp_mix_v2/hiaiao_codec.o

 

2：宏定义

 

HI_ALSA_AI_SUPPORT

 

 

3： 基本原理，5大部件

platform	---snd_soc_register_platform
codec
platform-dai
codec-dai
machine

 

4 platform

 

4.1 snd_soc_register_platform

 

hiaudio_dma_init	hiaudio_dma_device = platform_device_alloc("hisi-audio", -1); platform_device_add(hiaudio_dma_device); platform_driver_register(&hiaudio_dma_driver); 自己创建设备，自己注册驱动，这样就触动driver的porbe函数 static struct platform_driver hiaudio_dma_driver = {     .driver = {         .name = "hisi-audio",         .owner = THIS_MODULE,     },     .probe = soc_snd_platform_probe,     .remove = __exit_p(soc_snd_platform_remove), };
soc_snd_platform_probe	分配整个platform层的传输管理结构，struct hiaudio_data单独描述 had = kzalloc(sizeof(struct hiaudio_data), GFP_KERNEL); 设置为dev的drvdata    dev_set_drvdata(&pdev->dev, had); 初始化部分struct hiaudio_data部分成员 向soc注册  platform     ret = snd_soc_register_platform(&pdev->dev, &aiao_soc_platform_drv);   注册platform时，直接把驱动也注册上去了。
struct snd_soc_platform_driver aiao_soc_platform_drv	static struct snd_soc_platform_driver aiao_soc_platform_drv = {     .ops         = &hi_dma_ops,     .pcm_new   = hi_dma_pcm_new,     .pcm_free   = hi_dma_pcm_free,     .probe      = hi_dma_probe, #ifdef CONFIG_PM  .suspend = hi_dma_suspend,  .resume  = hi_dma_resume, #endif  };

 

4.2  snd_soc_platform_driver