parport_poll_peripheral(9)

💅 parport_poll_peripheral (kernel API manual, bestie edition)

okay so this is a page from the Kernel API Manual, and it's all about parport_poll_peripheral — yes the function name is a mouthful, no we're not shortening it, it's iconic like that ✨

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🌸 NAME 🌸

parport_poll_peripheral — poll status lines 👀

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🎀 SYNOPSIS 🎀

int parport_poll_peripheral (struct parport *port , unsigned char mask ,
       unsigned char result , int usec );

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🦋 ARGUMENTS 🦋

• port — the port you're watching, like your fave account, except it's hardware 🫶
• mask — which status lines you're watching (the ones that matter, not the background noise)
• result — the values you want those chosen status lines to have — the vibe check they gotta pass
• usec — the timeout, in microseconds ⏳

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✨ DESCRIPTION ✨

so what this baby does is busy-wait 💀 like literally sitting there refreshing until either:

1. the masked status lines hit the desired values, or
2. the timeout period runs out

that's it, that's the whole job, no cap.

the mask and result parameters are bitmasks, fr fr — the bits are defined by the constants in parport.h: PARPORT_STATUS_BUSY, and so on. iykyk 🌈

🚨 important: this function does not call schedule — instead it busy-waits using udelay. she's spinny, she's impatient, she's hogging the CPU bestie. it currently has a resolution of 5usec.

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🔥 return values (the moment you've been waiting for) 🔥

• if the status lines take on the desired values before the timeout period elapses → parport_poll_peripheral returns zero immediately, slay 🎉
• a return value greater than zero → that's a timeout 😭
• an error code (less than zero) → an error, most likely a signal that arrived 💀 and the caller should finish what it's doing as soon as possible

periodt. don't sit around after an error, wrap it up 👑

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💜 SEE ALSO 💜

• Kernel file ./drivers/parport/ieee1284.c (the whole file, not just a function, okay? stay educated 🧚)
• parport_wait_event(9)
• parport_wait_peripheral(9)
• parport_negotiate(9)
• parport_write(9)
• parport_read(9)
• parport_set_timeout(9)

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and that's the page bestie 🫶 this gem lives in ./drivers/parport, dated October 2026, and it's filed under parport_poll_peripheral(9) — go poll responsibly, mwah 💋⭐