ipc_protoco...bell_trigger(9)

💖 NAME 💖

ipc_protocol_doorbell_trigger — bestie, this is a lil wrapper around a PM (power management) function, and what it does is two things: it wakes the device up if it's chilling in low power mode, and then it triggers a head pointer update interrupt. That's it. That's the whole gig. ✨

So real quick, context: this page lives in the Kernel API Manual (section 9, kernel-land, no cap), and the page title is ipc_protoco...bell_trigger(9) — yes the header truncates it, don't come for me, that's just how the man page renders it. 🎀

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🌸 SYNOPSIS 🌸

void ipc_protocol_doorbell_trigger (struct iosm_protocol *ipc_protocol ,
u32 identifier );

Notice the void — this function hands you back nothing, it just does the thing. Iconic behavior honestly. 👑

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🦋 ARGUMENTS 🦋

• ipc_protocol — a pointer to the ipc_protocol instance. Like, the actual object you're poking at. Pass the pointer, bestie, not a copy. 🫶
• identifier — this one specifies what component triggered the hpda update irq. So it's the "who sent this" tag on the doorbell. 🔔

Ngl both of these are required — there's no "optional" energy on this page. Two args, that's the vibe check. 💅

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⭐ SEE ALSO ⭐

Lowkey the best part, because everything here is part of the same wwan/iosm family and you will want the whole set:

• Kernel file: ./drivers/net/wwan/iosm/iosm_ipc_protocol.h
• struct ipc_protocol_context_info(9)
• struct ipc_protocol_device_info(9)
• struct ipc_protocol_ap_shm(9)
• struct iosm_protocol(9)
• struct ipc_call_msg_send_args(9)
• ipc_protocol_tq_msg_send(9)
• ipc_protocol_msg_send(9)
• ipc_protocol_suspend(9)
• ipc_protocol_s2idle_sleep(9)
• ipc_protocol_resume(9)
• ipc_protocol_pm_dev_sleep_handle(9)
• ipc_protocol_sleep_notification_string(9)
• ipc_protocol_init(9)
• ipc_protocol_deinit(9)

Like, init and deinit are right there at the bottom holding hands — cute. 🍓

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Okay that's the whole page, go forth and ring those doorbells responsibly. 🌈

Signed off with love from ./drivers/net/wwan/iosm, dated October 2026, manual title ipc_protoco...bell_trigger(9) — see you in the group chat 💜🧚