snd_mpu401_uart_new(9)

💖 snd_mpu401_uart_new(9) 💖

okay so bestie, welcome to the Kernel API Manual page for snd_mpu401_uart_new — this is the one that spins up a whole MPU401-UART instance. yes, that MPU401. the MIDI one. we love her. 🎹✨

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✨ NAME ✨

snd_mpu401_uart_new — create an MPU401-UART instance 🎀

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🌸 SYNOPSIS 🌸

int snd_mpu401_uart_new (struct snd_card *card , int device , unsigned
short hardware , unsigned long port , unsigned int info_flags , int irq
, struct snd_rawmidi ** rrawmidi );

like, that's the whole mood. it returns an int. it takes a lot of arguments. slay. 💅

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🦋 ARGUMENTS 🦋

• card — the card instance. your sound card. the main character tbh 👑
• device — the device index, zero-based. yes, zero-based, count like a programmer not like a person 🙈
• hardware — the hardware type, MPU401_HW_XXXX. pick your flavour 🍓
• port — the base address of the MPU401 port. where the vibes live 📍
• info_flags — bitflags, MPU401_INFO_XXX. bitflags!! combine them, it's giving customization ✨
• irq — the ISA irq number, or -1 if it's not to be allocated. -1 means "no thanks, don't allocate one for me" 🫶
• rrawmidi — the pointer to store the new rawmidi instance. this is where the treasure ends up 🎁

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💀 DESCRIPTION 💀

So it creates a new MPU-401 instance. periodt. 🔥

But here's the plot twist bestie, and you NEED to hear this: the rawmidi instance is what gets returned on the rrawmidi argument — not the mpu401 instance itself. i know. i know. 😭

And if you want to actually reach the mpu401 instance? you cast from rawmidi->private_data (with struct snd_mpu401 magic-cast). yes, a magic-cast. no cap, that's literally what it says. iykyk 🧚✨

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⭐ RETURN ⭐

Zero if successful, or a negative error code. so like… zero is the good ending, negative is the "we don't talk about it" ending 💀

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🌈 SEE ALSO 🌈

• Kernel file ./sound/drivers/mpu401/mpu401_uart.c 👀
• snd_mpu401_uart_interrupt(9)
• snd_mpu401_uart_interrupt_tx(9)

go read those too, bestie. i believe in you. 🫶

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okay that's the whole page, and before you go — this lil beauty lives in ./sound/drivers/mpu401 and it's dated October 2026. so in conclusion: go make some MIDI, stay zero-based, and never forget to magic-cast responsibly. mwah 💋💖🎀🦋🌸💅🫶✨👑🌈⭐💜