Platform: Rockchip
OS: Android 6.0
Kernel: 3.10.92
系统使用ASOC来处理Audio部分，可分为三大部分： Machine, Codec以及Platform.
其中Codec分codec driver以及codec dai driver,Platform分platform driver以及CPU dai driver.
rk_rt5631.c：
Machine driver，和板子相关，所以不同的板子都需要作修改。
rt5631.c：
Codec driver以及Codec dai driver，和平台无关。相关的部分被放在Machine以及Platform驱动中处理。
rk_i2s.c：
Platform下的cpu dai driver，不包含和板子相关的控制，只和平台相关，因为I2S控制器是一定的。
rk_pcm.c：
Platform driver,dma相关控制，用来输出数据到i2s。
注册及重要的数据结构：
Machine driver注册：
rockchip_rt5631_audio_probe -> rk_rt5631.c
snd_soc_register_card
snd_soc_card:
static struct snd_soc_card rockchip_rt5631_snd_card = {
.name = "RK_RT5631",
.dai_link = &rk29_dai,
.num_links = 1,
};
snd_soc_dai_link：
static struct snd_soc_dai_link rk29_dai = {
.name = "rt5631",
.stream_name = "rt5631 PCM",
.codec_dai_name = "rt5631-hifi",
.init = rk29_rt5631_init,
.ops = &rk29_ops,
};
Codec以及codec dai driver注册：
rt5631_i2c_probe -> rt5631.c
snd_soc_register_codec
snd_soc_codec_driver:
static struct snd_soc_codec_driver soc_codec_dev_rt5631 = {
.probe = rt5631_probe,
.remove = rt5631_remove,
.suspend = rt5631_suspend,
.resume = rt5631_resume,
.set_bias_level = rt5631_set_bias_level,
.reg_cache_size = ARRAY_SIZE(rt5631_reg),
.reg_word_size = sizeof(u16),
.reg_cache_default = rt5631_reg,
.reg_cache_step = 1,
};
snd_soc_dai_driver:
static struct snd_soc_dai_driver rt5631_dai[] = {
{
.name = "rt5631-hifi",
.playback = {
.stream_name = "HIFI Playback",
.channels_min = 1,
.channels_max = 2,
.rates = RT5631_STEREO_RATES,
.formats = RT5631_FORMAT,
},
.capture = {
.stream_name = "HIFI Capture",
.channels_min = 1,
.channels_max = 2,
.rates = RT5631_STEREO_RATES,
.formats = RT5631_FORMAT,
},
.ops = &rt5631_ops,
},
};
Platform driver注册：
rockchip_i2s_probe -> rk_i2s.c
rockchip_pcm_platform_register ->
snd_dmaengine_pcm_register ->
snd_soc_add_platform
snd_soc_platform_driver：
static const struct snd_soc_platform_driver dmaengine_no_residue_pcm_platform = {
.ops = &dmaengine_no_residue_pcm_ops,
.pcm_new = dmaengine_pcm_new,
.pcm_free = dmaengine_pcm_free,
.probe_order = SND_SOC_COMP_ORDER_LATE,
};
CPU dai driver注册：
rockchip_i2s_probe -> rk_i2s.c
snd_soc_register_component
snd_soc_dai_driver:
static struct snd_soc_dai_driver rockchip_i2s_dai = {
.probe = rockchip_i2s_dai_probe,
.playback = {
.stream_name = "Playback",
.channels_min = 2,
.channels_max = 8,
.rates = ROCKCHIP_I2S_RATES,
.formats = ROCKCHIP_I2S_FORMATS,
},
.capture = {
.stream_name = "Capture",
.channels_min = 2,
.channels_max = 8,
.rates = ROCKCHIP_I2S_RATES,
.formats = ROCKCHIP_I2S_FORMATS,
},
.ops = &rockchip_i2s_dai_ops,
.symmetric_rates = 1,
};
原作者：KrisFei
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