cs4270_set_dai_fmt(9)

💅 cs4270_set_dai_fmt — your girl's guide (kernel API manual energy)

okay so bestie, welcome to cs4270_set_dai_fmt — a real one from the Kernel API Manual, and yes we're doing this properly. this is the function that configures the codec for the selected audio format. that's the whole vibe. periodt. 🎀

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✨ SYNOPSIS ✨

int cs4270_set_dai_fmt (struct snd_soc_dai *codec_dai , unsigned int
format );

like, that's the signature, copy it exactly, don't @ me. 🫶

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🌸 ARGUMENTS 🌸

• codec_dai — the codec DAI. that's it, that's the arg. she's the main character here 👑
• format — a SND_SOC_DAIFMT_x value indicating the data format ✨

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💖 DESCRIPTION 💖

so the way this works: this function takes a bitmask of SND_SOC_DAIFMT_x bits and programs the codec accordingly. bitmask in, codec programmed, slay. 🔥

now the important part, lowkey: currently, this function only supports SND_SOC_DAIFMT_I2S and SND_SOC_DAIFMT_LEFT_J. that's it. those two. 😭

and ngl there's a little sad story here — the CS4270 codec also supports right-justified data for playback only, but ASoC currently does not support different formats for playback vs. record. so it's giving "we could but we can't" 💀. not our fault, it's an ASoC thing. fr fr.

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🦋 SEE ALSO 🦋

• Kernel file ./sound/soc/codecs/cs4270.c
• struct cs4270_mode_ratios(9)
• cs4270_set_dai_sysclk(9)
• cs4270_hw_params(9)
• cs4270_dai_mute(9)
• cs4270_soc_put_mute(9)
• cs4270_probe(9)
• cs4270_remove(9)
• cs4270_i2c_remove(9)
• cs4270_i2c_probe(9)

go read those next, iykyk 📚✨

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and that's the page!! source/version vibes live at ./sound/soc/codecs, dated October 2026 — like, mark your calendar bestie 🗓️💜. love u, go program a codec, bye!! 🧚‍♀️🌈