STRUCT RMI_FUNCTION(9)

🌸 struct rmi_function(9) 🌸

okay so bestie, welcome to section 9 of the Kernel API Manual — this one's called struct rmi_function and it's genuinely one of my faves to explain.

💖 NAME 💖

struct rmi_function — this is the thing that represents the implementation of an RMI4 function for a particular device. like, basically? it's the driver for that RMI4 function. that's the whole vibe. 🫶

✨ SYNOPSIS ✨

struct rmi_function {
    struct rmi_function_descriptor fd;
    struct rmi_device *rmi_dev;
    struct device dev;
    struct list_head node;
    unsigned int num_of_irqs;
    int irq[RMI_FN_MAX_IRQS];
    unsigned int irq_pos;
    unsigned long irq_mask[];
 };

🎀 Members 🎀

bestie. let's go through the squad one by one 👑

• fd — the function descriptor of the RMI function 💅
• rmi_dev — a pointer to the RMI device that's associated with this function container 🦋
• dev — the device associated with this particular function, like, this specific one ✨
• node — the entry in the device's list of functions. very "i'm on the list, i'm on the list" of it 🎀
• num_of_irqs — how many irqs this function needs 🌸
• irq_pos — where this function sits in the irq bitfield 📍
• irq_mask — for convenience!! can be used to mask IRQ bits off during ATTN interrupt handling 🔥

🦋 SEE ALSO 🦋

• Kernel file ./drivers/input/rmi4/rmi_bus.h struct
• rmi_function_handler(9)
• rmi_reset(9)
• rmi_read(9)
• rmi_read_block(9)
• rmi_write(9)
• rmi_write_block(9)

ngl bestie, go read those too — that's the assignment 💜

and that's the whole page!! ✨ mwah 💋 — this came out of ./drivers/input/rmi4, dated October 2026, and it's struct rmi_function(9) signing off. slay, bye 🧚‍♀️