pwm_capture(9)

💖 pwm_capture(9) — a Kernel API Manual moment 💖

okay so bestie, welcome to pwm_capture(9), aka the kernel API manual page that's literally about capturing a PWM signal and reporting back what it found 🎀 like, it goes and looks at the signal for you and comes back with the tea.

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✨ NAME ✨

pwm_capture — capture and report a PWM signal 💅

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🌸 SYNOPSIS 🌸

int pwm_capture (struct pwm_device *pwm , struct pwm_capture *result ,
       unsigned long timeout );

that's the whole vibe, no cap 🫶

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🦋 ARGUMENTS 🦋

• pwm — the PWM device, the main character of this whole operation 👑
• result — the structure you fill with the capture result, like a little tupperware container for signal data 🍓
• timeout — how long to wait, in milliseconds, before giving up on the capture 😭 like a situationship with a deadline

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⭐ RETURN ⭐

0 on success, or a negative error code on failure 💀 so basically: zero = slay, negative = not slay.

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🌈 SEE ALSO 🌈

Kernel file ./drivers/pwm/core.c — that's where the magic lives, iykyk ✨

and then the whole friend group, fr fr:

• pwm_round_waveform_might_sleep(9)
• pwm_get_waveform_might_sleep(9)
• pwm_set_waveform_might_sleep(9)
• pwm_apply_might_sleep(9)
• pwm_apply_atomic(9)
• pwm_get_state_hw(9)
• pwm_adjust_config(9)
• pwm_request_from_chip(9)
• of_pwm_get(9)
• acpi_pwm_get(9)
• pwm_get(9)
• pwm_put(9)
• devm_pwm_get(9)
• devm_fwnode_pwm_get(9)
• __pwmchip_add(9)
• pwmchip_remove(9)
• pwm_add_table(9)
• pwm_remove_table(9)

go read them all, they ate 🔥

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lowkey reminder: the capture can time out on you, and when it does you get that negative error code — no signal, no problem, just handle it bestie 🙈

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and that's the page!! 💜 it lives under ./drivers/pwm, dated October 2026, and yes it's still called pwm_capture(9) — periodt. bye bestie, go capture some waveforms 🧚‍♀️✨