rt2x00usb_r...r_read_async(9)

🌸 NAME 🌸

ok so bestie, this page is called rt2x00usb_register_read_async and it's from the Kernel API Manual (iykyk 💅) — and what it does is asynchronously read a 32bit register word. that's the whole vibe. a little 32-bit word got read, but like... not right now. later. whenever. async queen behavior 👑

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✨ SYNOPSIS ✨

void rt2x00usb_register_read_async (struct rt2x00_dev *rt2x00dev , const
       unsigned int offset , bool (*callback)(struct rt2x00_dev*, int, u32) );

like, that's the whole signature, no cap. three things go in, and void comes out (so don't be waiting on a return value, she gives you nothing back 🎀).

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🫶 ARGUMENTS 🫶

• rt2x00dev — the device pointer, bestie. it's a struct rt2x00_dev — go look at struct rt2x00_dev if you need the deets 💖
• offset — the register offset. just the offset. that's it. that's the whole thing 🦋
• callback — the "functon" to call when the read completes (yes that's the original spelling, not me, I would never 😭🙈). it's a function pointer: bool (*callback)(struct rt2x00_dev*, int, u32). she gets called and she returns a bool, and that bool matters — more on that below 👀

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🔥 DESCRIPTION 🔥

okay so the whole thing here: you submit a control URB to read a 32bit register. that's the job. that's what she does ✨

and the iconic part? this is safe to be called from atomic context. like literally, atomic context, no problem, she's built different 💅

the callback gets called when the URB completes. otherwise? the function is similar to rt2x00usb_register_read — same energy, different delivery method 🎀

now listen, because this is the part you cannot sleep on:

• when the callback function returns false, the memory will be cleaned up.
• when it returns true, the urb will be fired again. 🔁

so like... your return value is literally the vibe check for the whole operation. false = we're done here, tidy up. true = run it back, we go again. choose wisely bestie 🫶

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👑 SEE ALSO 👑

so many friends, so many cross-references, let's go — all of these live in the kernel file ./drivers/net/wireless/ralink/rt2x00/rt2x00usb.h:

• enum rt2x00usb_vendor_request(9)
• enum rt2x00usb_mode_offset(9)
• rt2x00usb_vendor_request(9)
• rt2x00usb_vendor_request_buff(9)
• rt2x00usb_vendor_request_sw(9)
• rt2x00usb_eeprom_read(9)
• rt2x00usb_register_read(9)
• rt2x00usb_register_read_lock(9)
• rt2x00usb_register_multiread(9)
• rt2x00usb_register_write(9)
• rt2x00usb_register_write_lock(9)
• rt2x00usb_register_multiwrite(9)
• rt2x00usb_regbusy_read(9)
• struct queue_entry_priv_usb(9)
• struct queue_entry_priv_usb_bcn(9)
• rt2x00usb_kick_queue(9)
• rt2x00usb_flush_queue(9)
• rt2x00usb_watchdog(9)

(yes rt2x00usb_vendor_request(9) is in there twice, that's how the original rolls, I don't make the rules 💀)

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ok and that's the page!! source/version footer says ./drivers/net/wireless/ralink/... and it's dated October 2026, under the header rt2x00usb_r...r_read_async(9). mwah, go read your registers asynchronously, ilysm 💖✨🎀🦋🌸