rt_sdca_index_update_bits(9)

💅 rt_sdca_index_update_bits — the Kernel API Manual, bestie edition 🎀

okay so picture this: you're deep in the Kernel API Manual, section 9, and you just need to poke one tiny little bitmask on a Realtek-defined register without nuking the whole thing. that's literally this function. she's a read-modify-write girlie and she ate. ✨

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✨ NAME ✨

rt_sdca_index_update_bits — update the value on a Realtek defined register. no cap, that's the whole gig 🫶

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🌸 SYNOPSIS 🌸

int rt_sdca_index_update_bits (struct regmap *map , unsigned int nid ,
       unsigned int reg , unsigned int mask , unsigned int val );

like, five args, one int back, she's iconic and she's tidy 💖

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🦋 ARGUMENTS 🦋

• map — the map for setting. it's giving "the regmap you're working through" 🗺️
• nid — the Realtek-defined ID. yes bb, Realtek-specific, don't come at her with anything else 💅
• reg — the register. the actual spot we're touching 🙈
• mask — bitmask to change. this is the "which bits tho" of it all ⭐
• val — new value for the bitmask. the fresh fit you're putting on those bits 👑

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🔥 DESCRIPTION 🔥

so here's the tea: a value of zero gets returned when it works — success, slay, we love to see it 💜

and if things go sideways? a negative errno comes back in the error cases. not me getting a negative errno, i'm literally crying 😭 — but fr fr, that's your signal that something's off, so handle it.

lowkey important: zero = good vibes, negative errno = bad vibes. that's the whole vibe check. 🧚

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🌈 SEE ALSO 🌈

• Kernel file ./sound/soc/codecs/rt-sdw-common.c — the home base, iykyk 📁
• rt_sdca_index_write(9)
• rt_sdca_index_read(9)
• rt_sdca_btn_type(9)
• rt_sdca_headset_detect(9)
• rt_sdca_button_detect(9)

the whole friend group, honestly. go say hi to the siblings 🫶✨

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and that's the page!! shipped straight out of ./sound/soc/codecs, dated October 2026, living in the Kernel API Manual like the main character she is. go update those bits bestie, you got this 💅🎀💖