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< / div > < div class = "- topic/body concept/conbody body conbody" > < p class = "- topic/p p" data-ofbid = "d46280e23__20250121171517" > 内核中音频采用 ALSA 驱动框架， ， ： ： < / p > < div class = "- topic/p p" data-ofbid = "d46280e25__20250121171517" > < br / > < div class = "imagecenter" > < img class = "- topic/image image imagecenter" id = "i2s_architecture__image_kk1_sg3_d1c" src = "../../../images/i2s/i2s_alsa_design.png" width = "384" alt = "design_12" / > < / div > < br / > < / div > < p class = "- topic/p p" data-ofbid = "d46280e29__20250121171517" > ALSA 框架将底层划分为三部分后，使得 platform 和 codec 的驱动实现变得更加简单，二者只专注于实现自己的功能代码，由 machine 驱动来实现 platform 和 codec 的耦合，二者依靠 dai 和 codec_dai 进行数据传输。platform 驱动的主要作用是完成音频数据的管理，最终通过 SOC 的数字音频接口(cpu_dai)把音频数据传送给 codec 进行播放或将 codec 采集的音频数据存储到内存中。< / p > < p class = "- topic/p p" data-ofbid = "d46280e31__20250121171517" > 在具体的实现上， （
DAI 的驱动。且 ALSA 框架中已实现了 DMA 对音频数据管理部分的驱动 代码，所以 S 的驱动只需要实现 CPU
DAI 部分的驱动，音频数据管理部分只需要指定数据传输的起始地址或目的地址，以及传输位宽即可。< / p > < section class = "- topic/section section" id = "i2s_architecture__section_lc4_sg3_d1c" data-ofbid = "i2s_architecture__section_lc4_sg3_d1c" > < h2 class = "- topic/title title sectiontitle" > CPU DAI 驱动< / h2 >
< p class = "- topic/p p" data-ofbid = "d46280e38__20250121171517" > 在驱动实现上，无论是 codec 还是 platform， ， ，
然后调用 component 进行统一注册。snd_soc_component_driver 主要是注册与 dapm 相关的音频控件等信息， < / p >
< p class = "- topic/p p" data-ofbid = "d46280e41__20250121171517" > 由于在 platform 端，主要是 S 接口和 DMA 的传输配置，不存在音频控件，所以 DAI 的驱动主要是实现 driver。包括指定 S 接口支持的通道数、采样率、支持的数据格式，以及对 S 配置和控制的回调函数集合 snd_soc_dai_ops 的实现< / p >
< / section > < section class = "- topic/section section" id = "i2s_architecture__section_mc4_sg3_d1c" data-ofbid = "i2s_architecture__section_mc4_sg3_d1c" > < h2 class = "- topic/title title sectiontitle" > 音频 DMA 驱动< / h2 >
< p class = "- topic/p p" data-ofbid = "d46280e49__20250121171517" > ALSA 架构中，对 DMA 的一些配置和传输的函数已经由 ALSA 框架实现，所以这部分驱动实现只需要指定 playback 和 capture 中 DMA 传输的地址以及传输的位宽，然后调用 register
进行注册即可。< / p >
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< div class = " wh_topic_toc " > < div class = "wh_topic_label" > 在本页上< / div > < ul > < li class = "section-item" > < div class = "section-title" > < a href = "#i2s_architecture__section_lc4_sg3_d1c" data-tocid = "i2s_architecture__section_lc4_sg3_d1c" > CPU DAI 驱动< / a > < / div > < / li > < li class = "section-item" > < div class = "section-title" > < a href = "#i2s_architecture__section_mc4_sg3_d1c" data-tocid = "i2s_architecture__section_mc4_sg3_d1c" > 音频 DMA 驱动< / a > < / div > < / li > < / ul > < / div >
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