snd_hda_cod...power_filter(9)

✨ snd_hda_codec_eapd_power_filter(9) ✨

okay so this is a page from the Kernel API Manual bestie, and it's about snd_hda_codec_eapd_power_filter — the little power filter callback for EAPD 🎀

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💖 NAME 💖

snd_hda_codec_eapd_power_filter — a power filter callback for EAPD ✨

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🦋 SYNOPSIS 🦋

unsigned int snd_hda_codec_eapd_power_filter (struct hda_codec *codec ,
hda_nid_t nid , unsigned int power_state );

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🎀 ARGUMENTS 🎀

• codec — the HDA codec 💅
• nid — widget NID 🌸
• power_state — power state to evalue (their spelling, not mine, don't come for me 😭)

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🌈 DESCRIPTION 🌈

ok so the whole vibe here: don't power down the widget if it controls eapd and EAPD_BTLENABLE is set. that's it, that's the rule 🫶

and yes, you can use this as a codec power_filter callback. iconic behavior honestly 👑

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👑 SEE ALSO 👑

kernel file ./sound/hda/common/codec.c — plus literally the entire extended universe, no cap:

• snd_hda_sequence_write(9)
• snd_hda_get_conn_list(9)
• snd_hda_get_connections(9)
• snd_hda_override_conn_list(9)
• snd_hda_get_conn_index(9)
• snd_hda_get_num_devices(9)
• snd_hda_get_devices(9)
• snd_hda_get_dev_select(9)
• snd_hda_set_dev_select(9)
• snd_hda_codec_set_pincfg(9)
• snd_hda_codec_get_pincfg(9)
• snd_hda_codec_set_pin_target(9)
• snd_hda_codec_get_pin_target(9)
• snd_hda_shutup_pins(9)
• snd_hda_codec_cleanup_for_unbind(9)
• snd_hda_codec_register(9)
• snd_hda_codec_unregister(9)
• snd_hda_codec_device_init(9)
• snd_hda_codec_new(9)
• snd_hda_codec_update_widgets(9)
• snd_hda_codec_setup_stream(9)
• __snd_hda_codec_cleanup_stream(9)
• query_amp_caps(9)
• snd_hda_check_amp_caps(9)
• snd_hda_override_amp_caps(9)
• snd_hda_codec_amp_update(9)
• snd_hda_codec_amp_stereo(9)
• snd_hda_codec_amp_init(9)
• snd_hda_codec_amp_init_stereo(9)
• snd_hda_mixer_amp_volume_info(9)
• snd_hda_mixer_amp_volume_get(9)
• snd_hda_mixer_amp_volume_put(9)
• snd_hda_mixer_amp_tlv(9)
• snd_hda_set_vmaster_tlv(9)
• snd_hda_find_mixer_ctl(9)
• snd_hda_ctl_add(9)
• snd_hda_ctls_clear(9)
• snd_hda_lock_devices(9)
• snd_hda_unlock_devices(9)
• snd_hda_codec_reset(9)
• __snd_hda_add_vmaster(9)
• snd_hda_add_vmaster_hook(9)
• snd_hda_sync_vmaster_hook(9)
• snd_hda_mixer_amp_switch_info(9)
• snd_hda_mixer_amp_switch_get(9)
• snd_hda_mixer_amp_switch_put(9)
• snd_hda_create_dig_out_ctls(9)
• snd_hda_spdif_out_of_nid(9)
• snd_hda_spdif_ctls_unassign(9)
• snd_hda_spdif_ctls_assign(9)
• snd_hda_create_spdif_share_sw(9)
• snd_hda_create_spdif_in_ctls(9)
• snd_hda_codec_set_power_to_all(9)
• snd_hda_codec_prepare(9)
• snd_hda_codec_cleanup(9)
• snd_hda_add_new_ctls(9)
• snd_hda_codec_set_power_save(9)
• snd_hda_set_power_save(9)
• snd_hda_check_amp_list_power(9)
• snd_hda_input_mux_info(9)
• snd_hda_input_mux_put(9)
• snd_hda_enum_helper_info(9)
• snd_hda_multi_out_dig_open(9)
• snd_hda_multi_out_dig_prepare(9)
• snd_hda_multi_out_dig_cleanup(9)
• snd_hda_multi_out_dig_close(9)
• snd_hda_multi_out_analog_open(9)
• snd_hda_multi_out_analog_prepare(9)
• snd_hda_multi_out_analog_cleanup(9)
• snd_hda_get_default_vref(9)
• snd_hda_correct_pin_ctl(9)
• _snd_hda_set_pin_ctl(9)
• snd_hda_add_imux_item(9)
• snd_hda_bus_reset_codecs(9)
• snd_hda_codec_set_gpio(9)
• snd_print_pcm_bits(9)

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💜 the sign-off 💜

this masterpiece lives in ./sound/hda/common, it's dated October 2026, and it will forever answer to the name snd_hda_cod...power_filter(9) 💅✨ slay, go read it again, mwah 🫶🍓