STRUCT RMI_FUNCTION_DESCRIPTOR(9)

✨ struct rmi_function_descriptor(9) ✨

okay bestie, so this is from the Kernel API Manual and it's literally all about struct rmi_function_descriptor — the RMI function base addresses. yes we're doing kernel structs today, put your hair up, we're getting into it 💅

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🌸 NAME 🌸

struct rmi_function_descriptor — RMI function base addresses. that's the whole vibe. no cap.

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🦋 SYNOPSIS 🦋

struct rmi_function_descriptor {
    u16 query_base_addr;
    u16 command_base_addr;
    u16 control_base_addr;
    u16 data_base_addr;
    u8 interrupt_source_count;
    u8 function_number;
    u8 function_version;
 };

look at her. seven fields. perfectly balanced. main character struct honestly 👑

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🎀 Members 🎀

so let's meet the cast, one by one, no skipping:

• query_base_addr — the RMI Query base address. that's it, that's her job 💖
• command_base_addr — the RMI Command base address. the girl who takes your orders 🫶
• control_base_addr — the RMI Control base address. lowkey the one running the whole operation ✨
• data_base_addr — the RMI Data base address. where the actual info lives, iconic 🌈
• interrupt_source_count — the number of irqs this RMI function needs. it's giving "how many alarms is this function setting" 💀
• function_number — the RMI function number. her ID, her little badge 🎀
• function_version — the RMI function version. so we know which era of her we're dealing with ⭐

ngl the two u8s at the end are just standing there being small and cute while the four u16s do all the heavy lifting. balance. periodt.

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🔥 Description 🔥

okay so here's the tea: this struct is used when iterating the Page Description Table. that's the whole use case, no secret bonus features, don't come for me 🙈

and the reason those four address fields are 16-bit values instead of something baby-sized? because the addresses need to include the current page address. that's literally why. 16-bit so the page address fits in there too. slay 🔥

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👑 SEE ALSO 👑

go read the kernel file ./include/linux/rmi.h first, bestie, then these iconic siblings:

• struct rmi_2d_axis_alignment(9)
• struct rmi_gpio_data(9)
• struct rmi_f01_power_management(9)
• struct rmi_device_platform_data_spi(9)
• struct rmi_device_platform_data(9)
• struct rmi_transport_dev(9)
• struct rmi_transport_ops(9)
• struct rmi_driver(9)
• struct rmi_device(9)

a whole friend group honestly, they ate 💜

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and that's the page!! sourced from ./include/linux, dated October 2026, and obviously it all lives under struct rmi_f...n_descriptor(9) because that's the star of the show. byeee, go read your structs 🧚✨💖