在分析snd_soc_codec_driver的结构体时,发现有些芯片的驱动中定义了字段reg_word_size, reg_cache_size, reg_cache_default,但没有定义read/write,如wm8993: staticstructsnd_soc_codec_driver soc_codec_dev_wm8993 ={ .probe=wm8993_probe, .remove
CPU DAI和codec DAI 驱动用结构体 struct snd_soc_dai_driver描述,其字段ops的类型是 struct snd_soc_dai_ops,定义了DAI驱动的操作接口。 代码如下: struct snd_soc_dai_ops {/* * DAI clocking configuration, all optional. * Called by soc_card drivers, normally in their hw_params. */int (*set_...
structsnd_soc_dai_ops接口介绍 structsnd_soc_dai_ops接⼝介绍 CPU DAI和codec DAI 驱动⽤结构体 struct snd_soc_dai_driver描述，其字段ops的类型是 struct snd_soc_dai_ops，定义了DAI驱动的操作接⼝。代码如下：struct snd_soc_dai_ops { /* * DAI clocking configuration, all optional.* Called ...
... // audio machine driver表示音频设备结构体,我的ep9312作为一个arm-SoC芯片, // 就是这里的machine,一个machine当然要包含自己内部的音频控制接口单元--cpu_dai和 // 外部音频设备通信协议转换接口单元--codec_dai这两部分,这样ep9312才能使用自己 // 内部的一个音频控制通道,通过数据交互总线协议(如:PCM...
Alsa驱动snd_soc_read的底层实现 2015-01-27 22:43 −在分析snd_soc_codec_driver的结构体时,发现有些芯片的驱动中定义了字段reg_word_size, reg_cache_size, reg_cache_default,但没有定义read/write,如wm8993: static struct snd_soc_codec_dri... ...
control控制接口控制接口对于许多开关(switch)和调节器(slider)应用广泛,它能被用户空间存取,从而读写CODEC相关寄存器。control的主要用于mixer。它用snd_kcontrol_new结构体描述。snd_kcontrol_new [cpp] view plaincopy structsnd_kcontrol_new { sn ...
error: 'struct snd_soc_codec' has no member named 'write' I see that include/sound/soc.h has really changed between those kernel versions. So, what other member of the struct snd_soc_codec {...} may replace member 'write', or what function may be used inste...
Background: The snd-soc-dummy codec is a dummy codec used for testing and sometimes with i2s codecs that doesn't have their own driver. Example of use: https://github.com/skakri/asoc-i2s-loader/blob/master/asoc-i2s-loader.c It restricts ...
snd_pcm_set_ops(pcm,SNDRV_PCM_STREAM_CAPTURE,&soc_pcm_ops); ... } 在定义时初始化好的structsnd_pcm_ops结构体所指向的函数主要是通用函数(同时针对codec,codec_dai,platform、cpu_dai),而soc_new_pcm所赋值的函数主要是针对platform的函数。 我们看看...
#open函数 static int soc_pcm_open(struct snd_pcm_substream *substream) { if (cpu_dai-driver-ops-startup) ret = cpu_dai-driver-ops-startup(substream, cpu_dai); if (platform-driver-ops platform-driver-ops-open) { ret = platform-driver-ops-open(substream); if (codec_dai-driver-ops...