STRUCT MUSB_IO(9)

✨ struct musb_io(9) ✨

okay so bestie, this is a page from the Kernel API Manual — it's all about struct musb_io, which is literally the IO functions for MUSB 🦋 like, the little bundle of function pointers that lets MUSB talk to whatever platform it happens to be sitting on?? iconic behaviour honestly.

---

🌸 NAME 🌸

struct musb_io — IO functions for MUSB 💅

---

🎀 SYNOPSIS 🎀

here's the whole vibe, no cap, copied exactly:

struct musb_io {
    u32 (*ep_offset)(u8 epnum, u16 offset);
    void (*ep_select)(void __iomem *mbase, u8 epnum);
    u32 (*fifo_offset)(u8 epnum);
    void (*read_fifo)(struct musb_hw_ep *hw_ep, u16 len, u8 *buf);
    void (*write_fifo)(struct musb_hw_ep *hw_ep, u16 len, const u8 *buf);
    u32 (*busctl_offset)(u8 epnum, u16 offset);
    u16 (*get_toggle)(struct musb_qh *qh, int is_out);
    u16 (*set_toggle)(struct musb_qh *qh, int is_out, struct urb *urb);
 };

---

👑 Members 👑

so each one of these is a function pointer, and every single one of them is platform specific — meaning the platform fills it in, not you, bestie 🙈 here's the full roster:

• ep_offset — platform specific function to get end point offset ⭐
• ep_select — platform specific function to select end point 🎯
• fifo_offset — platform specific function to get fifo offset 🍓
• read_fifo — platform specific function to read fifo 📖
• write_fifo — platform specific function to write fifo ✍️
• busctl_offset — platform specific function to get busctl offset 🚌
• get_toggle — platform specific function to get toggle 🔁
• set_toggle — platform specific function to set toggle ✅

that's all eight of them, we did not skip a single one, periodt 💀

---

🔥 SEE ALSO 🔥

• Kernel file ./drivers/usb/musb/musb_io.h — go read it, iykyk 💜

---

and that's the whole page, bestie!! 🫶 this one lives under ./drivers/usb/musb and it's dated October 2026 — so yeah, future vibes only 🌈 mwah 💋✨