DEVICE_ULONG_ATTR(9)

💅 DEVICE_ULONG_ATTR(9) ✨

okay so bestie, welcome to the Kernel API Manual 🎀 — like, the actual manual page for DEVICE_ULONG_ATTR(9), and no, that's not a typo, it's literally the name. buckle up 🦋

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✨ NAME ✨

DEVICE_ULONG_ATTR — the macro that defines a device attribute backed by an unsigned long. that's it, that's the whole vibe 💖

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🌸 SYNOPSIS 🌸

DEVICE_ULONG_ATTR (_name , _mode , _var );

like, yes, the spacing is weird, but that's literally how it's written, i don't make the rules 💀

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🦋 ARGUMENTS 🦋

• _name — the attribute name 🏷️ literally what you're gonna call this thing.
• _mode — the file mode. you know, the permission bits ✨
• _var — the identifier of the unsigned long. this is the actual variable in question, the main character 👑

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💜 DESCRIPTION 💜

okay so here's the tea 🍓: this is just like DEVICE_ATTR, but _show and _store get provided for you automatically — no cap, you don't write them yourself.

what that means, bestie: when userspace reads from the attribute, it affects _var. when userspace writes to it, it also affects _var. so the whole read/write pipeline is just... handled. slay 💅 the variable is literally living its best life, being read and written from the other side and you didn't have to lift a finger 🫶

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🌈 SEE ALSO 🌈

like, there's a lot here — it's giving "i know everybody at this party" energy 😭 but here we go, every single one:

• Kernel file ./include/linux/device.h
• struct subsys_interface(9)
• struct device_attribute(9)
• struct dev_ext_attribute(9)
• DEVICE_ATTR(9)
• DEVICE_ATTR_RW(9)
• DEVICE_ATTR_ADMIN_RW(9)
• DEVICE_ATTR_RW_NAMED(9)
• DEVICE_ATTR_RO(9)
• DEVICE_ATTR_ADMIN_RO(9)
• DEVICE_ATTR_RO_NAMED(9)
• DEVICE_ATTR_WO(9)
• DEVICE_ATTR_WO_NAMED(9)
• DEVICE_INT_ATTR(9)
• DEVICE_BOOL_ATTR(9)
• DEVICE_STRING_ATTR_RO(9)
• enum device_link_state(9)
• enum dl_dev_state(9)
• enum device_removable(9)
• struct dev_links_info(9)
• struct dev_msi_info(9)
• enum device_physical_location_panel(9)
• enum device_physical_location_vertical_position(9)
• enum device_physical_location_horizontal_position(9)
• struct device_physical_location(9)
• enum struct_device_flags(9)
• struct device(9)
• struct device_link(9)
• device_set_driver_override(9)
• device_has_driver_override(9)
• device_match_driver_override(9)
• device_iommu_mapped(9)
• dev_name(9)
• dev_bus_name(9)
• device_find_child_by_name(9)
• device_find_any_child(9)
• device_lock_set_class(9)
• device_lock_reset_class(9)

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💀 ngl, if you were looking for struct device lore, you are so in the right place, this list ate and left no crumbs 🔥

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mwah 💋 — this page lives in ./include/linux, it's stamped October 2026, and it'll always answer to the name DEVICE_ULONG_ATTR(9). iykyk 🧚💜