snd_hwdep_new(9)

💖 snd_hwdep_new 💖

okay so real talk, bestie — welcome to the Kernel API Manual, section 9, and today's main character is snd_hwdep_new, which literally makes a hwdep instance for you. no cap, this one's a little factory function and it eats. 🏭✨

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✨ SYNOPSIS ✨

int snd_hwdep_new (struct snd_card *card , char *id , int device ,
       struct snd_hwdep **rhwdep );

like, that's the whole vibe check right there 🫶

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🎀 ARGUMENTS 🎀

• card — the card instance, aka the card you're building this hwdep on top of. this is the parent energy.
• id — the id string. it's a string. it's an id. you got this 💅
• device — the device index, and yes bestie it's zero-based, so start counting from 0 like a real one 🔢
• rhwdep — the pointer where the new hwdep instance gets stored. it's the "put the baby here" pointer 🍼

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🌸 DESCRIPTION 🌸

so what does it do?? it creates a new hwdep instance with the given index on the card. that's the whole thing, no cap. 🦋

⚠️ okay listen, this part matters: the callbacks (hwdep->ops) must be set on the returned instance after this call, manually, by the caller. not me, not the kernel, not the vibes — you. the function hands you the instance and then it's on you to wire up hwdep->ops yourself. don't forget or it's giving unfinished project 😭

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⭐ RETURN ⭐

• Zero if it's successful — slay, we love a 0 💚
• a negative error code on failure — 😭 not the negative error code

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👑 SEE ALSO 👑

• Kernel file ./sound/core/hwdep.c — go read it, iykyk 📖🔥

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and that's the page, bestie!! 💖✨ this little gem lives over in ./sound/core, it's from October 2026, and it came to you straight from the Kernel API Manual — take care of her, she's iconic 🎀🫶💜