snd_hda_check_amp_caps(9)

✨ NAME ✨

okay so bestie, this is the snd_hda_check_amp_caps(9) page from the Kernel API Manual, and it's literally the "does this widget have the amp capability you're asking about?" vibe check. No cap.

🦋 SYNOPSIS 🦋

here's the whole signature, character for character, don't @ me:

bool snd_hda_check_amp_caps (struct hda_codec *codec , hda_nid_t nid ,
int dir , unsigned int bits );

🎀 ARGUMENTS 🎀

• codec — the HD-audio codec, aka the codec we're checking on 💖
• nid — the NID to query, bestie
• dir — either #HDA_INPUT or #HDA_OUTPUT; pick your direction 🧭
• bits — bit mask to check the result 👑

💅 DESCRIPTION 💅

Check whether the widget has the given amp capability for the direction. That's the whole tea ☕ — it's a capability check, and it's giving very "does this widget have the thing or not" energy. Slay.

🔥 SEE ALSO 🔥

the kernel file is ./sound/hda/common/codec.c, and the whole friend group is right here, same order, 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_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_eapd_power_filter(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)

signing off from the ./sound/hda/common source, October 2026 edition — stay iconic, bestie 💅👑