struct snd_kcontrol *k,intevent){structsnd_soc_dapm_context*dapm=w->dapm;structsnd_soc_card*card=dapm->card;structtegra_aic326x*machine=snd_soc_card_get_drvdata(card);structtegra_asoc_platform_data*pdata=machine->pdata;if(machine->dmic_reg && machine->dmic_1v8_reg) {if(SND_SOC_DAPM...
return ak4104_spi_write(codec, AK4104_REG_CHN_STATUS(3), val); } static struct snd_soc_dai_ops ak4101_dai_ops = { static const struct snd_soc_dai_ops ak4101_dai_ops = { .hw_params = ak4104_hw_params, .set_fmt = ak4104_set_dai_fmt, }; Expand Down 2 changes: 1 addition...
shift是位偏移,而位掩码mask是通过宏SOC_DOUBLE_R_TLV中的xmax运算得到:unsigned int mask = (1 << fls(max)) - 1; 调用snd_soc_update_bits()->snd_soc_write()将ucontrol的value送到CODEC的寄存器上。 snd_soc_put_volsw_2r()作为一个callback函数,用户层要设置某些功能时,如改变Playback Volume: ...
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codec->write = codec_drv->write; codec->read = codec_drv->read; codec->volatile_register = codec_drv->volatile_register; OK,这里和我们soc_codec_dev_wm8400以及cx20442_codec_dev都对应的上,snd_soc_read最终会调用我们提供的回调函数。
#define SOC_DOUBLE_R_TLV(xname, reg_left, reg_right, xshift, xmax, xinvert, tlv_array) / { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = (xname),/ .access = SNDRV_CTL_ELEM_ACCESS_TLV_READ |/ SNDRV_CTL_ELEM_ACCESS_READWRITE,/ ...
易于编程:开发者可以使用标准的文件操作函数(如 open、read、write、close)来控制声卡,简化了音频编程的复杂性。 类型 /dev/snd目录下通常包含以下几种类型的设备文件: controlC0:用于控制声卡的配置,如音量调节、静音等。 pcmC0D0c:用于音频捕获(输入),即从麦克风等设备获取音频数据。
[i].capture); } } ret = snd_soc_register_dais(component, dai_drv, num_dai); if (ret < 0) { dev_err(component->dev, "ASoC: Failed to register DAIs: %d\n", ret); goto err_cleanup; } if (!component->driver->write && !component->driver->read) { if (!component->regmap) ...
codec->write = timpani_codec_write; codec->dai = timpani_codec_dai; codec->num_dai = ARRAY_SIZE(timpani_codec_dai); codec->control_data = platform_get_drvdata(pdev); timpani_codec = codec;snd_soc_register_dais(timpani_codec_dai, ARRAY_SIZE(timpani_codec_dai)); ...
Yuri Nedel Prodigy10points When porting a codec from kernel 2.6.32 to 2.6.37, getting this compilation error: 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...