charger_man...repare_sysfs(9)

💅 NAME

okay so this is charger_manager_prepare_sysfs — it prepares a sysfs entry for each charger, from the Kernel API Manual (yes bestie, that's a whole manual, we're fancy now 💖).

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✨ SYNOPSIS

int charger_manager_prepare_sysfs (struct charger_manager *cm );

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🎀 ARGUMENTS

• cm — the Charger Manager that's representing the battery. that's it, that's the whole argument, she's low maintenance 💅

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🦋 DESCRIPTION

okay so picture this: this function adds a sysfs entry for the charger (the regulator, iykyk) so that user-space can actually control the charger. main character energy fr fr 👑

and here's the vibe — sometimes a development board uses one more chargers for charging, but only needs one charger in a specific case, and that case depends on the user scenario or on hardware restrictions. so what does the user do? they enter 1 or 0 (zero, the number, not the letter, don't embarrass me 🙈) into:

/sys/class/power_supply/battery/charger.[index]/externally_control

for example — if the user enters 1 into sys/class/power_supply/battery/charger.[index]/externally_control, then that charger isn't controlled from charger-manager anymore, and it always stays in the off state of the regulator. like it's off duty, permanently, no cap 😭

ngl the externally_control knob is the whole point here — that's the little doorway the user-space side walks through. respect it.

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🌈 SEE ALSO

the kernel file ./drivers/power/supply/charger-manager.c ✨ and the whole squad:

• is_batt_present(9)
• is_ext_pwr_online(9)
• get_batt_uV(9)
• is_charging(9)
• is_full_charged(9)
• is_polling_required(9)
• try_charger_enable(9)
• check_charging_duration(9)
• cm_get_target_status(9)
• _cm_monitor(9)
• cm_monitor(9)
• _setup_polling(9)
• cm_monitor_poller(9)
• cm_setup_timer(9)
• charger_extcon_work(9)
• charger_extcon_notifier(9)
• charger_extcon_init(9)
• charger_manager_register_extcon(9)

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and that's the page bestie 🫶 this little gem lives over in ./drivers/power/supply, and it's dated October 2026 — mark your calendars, it's giving iconic 👑⭐💜