394 lines
14 KiB
C
394 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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// Copyright (c) 2025 Šerif Rami <ramiserifpersia@gmail.com>
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#include "us144mkii.h"
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/**
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* @brief Text descriptions for playback output source options.
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*
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* Used by ALSA kcontrol elements to provide user-friendly names for
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* the playback routing options (e.g., "Playback 1-2", "Playback 3-4").
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*/
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static const char * const playback_source_texts[] = {"Playback 1-2", "Playback 3-4"};
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/**
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* @brief Text descriptions for capture input source options.
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*
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* Used by ALSA kcontrol elements to provide user-friendly names for
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* the capture routing options (e.g., "Analog In", "Digital In").
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*/
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static const char * const capture_source_texts[] = {"Analog In", "Digital In"};
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/**
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* tascam_playback_source_info() - ALSA control info callback for playback source.
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* @kcontrol: The ALSA kcontrol instance.
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* @uinfo: The ALSA control element info structure to fill.
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*
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* This function provides information about the enumerated playback source
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* control, including its type, count, and available items (Playback 1-2, Playback 3-4).
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*
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* Return: 0 on success.
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*/
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static int tascam_playback_source_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
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{
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uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
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uinfo->count = 1;
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uinfo->value.enumerated.items = 2;
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if (uinfo->value.enumerated.item >= 2)
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uinfo->value.enumerated.item = 1;
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strscpy(uinfo->value.enumerated.name,
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playback_source_texts[uinfo->value.enumerated.item],
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sizeof(uinfo->value.enumerated.name));
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return 0;
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}
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/**
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* tascam_line_out_get() - ALSA control get callback for Line Outputs Source.
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* @kcontrol: The ALSA kcontrol instance.
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* @ucontrol: The ALSA control element value structure to fill.
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*
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* This function retrieves the current selection for the Line Outputs source
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* (Playback 1-2 or Playback 3-4) from the driver's private data and populates
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* the ALSA control element value.
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*
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* Return: 0 on success.
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*/
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static int tascam_line_out_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
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{
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struct tascam_card *tascam = snd_kcontrol_chip(kcontrol);
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ucontrol->value.enumerated.item[0] = tascam->line_out_source;
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return 0;
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}
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/**
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* tascam_line_out_put() - ALSA control put callback for Line Outputs Source.
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* @kcontrol: The ALSA kcontrol instance.
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* @ucontrol: The ALSA control element value structure containing the new value.
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*
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* This function sets the Line Outputs source (Playback 1-2 or Playback 3-4)
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* based on the user's selection from the ALSA control element. It validates
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* the input and updates the driver's private data.
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*
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* Return: 1 if the value was changed, 0 if unchanged, or a negative error code.
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*/
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static int tascam_line_out_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
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{
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struct tascam_card *tascam = snd_kcontrol_chip(kcontrol);
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if (ucontrol->value.enumerated.item[0] > 1)
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return -EINVAL;
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if (tascam->line_out_source == ucontrol->value.enumerated.item[0])
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return 0;
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tascam->line_out_source = ucontrol->value.enumerated.item[0];
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return 1;
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}
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/**
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* tascam_line_out_control - ALSA kcontrol definition for Line Outputs Source.
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*
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* This defines a new ALSA mixer control named "Line OUTPUTS Source" that allows
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* the user to select between "Playback 1-2" and "Playback 3-4" for the analog
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* line outputs of the device. It uses the `tascam_playback_source_info` for
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* information and `tascam_line_out_get`/`tascam_line_out_put` for value handling.
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*/
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static const struct snd_kcontrol_new tascam_line_out_control = {
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.iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = "Line OUTPUTS Source",
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.info = tascam_playback_source_info, .get = tascam_line_out_get, .put = tascam_line_out_put,
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};
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/**
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* tascam_digital_out_get() - ALSA control get callback for Digital Outputs Source.
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* @kcontrol: The ALSA kcontrol instance.
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* @ucontrol: The ALSA control element value structure to fill.
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*
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* This function retrieves the current selection for the Digital Outputs source
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* (Playback 1-2 or Playback 3-4) from the driver's private data and populates
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* the ALSA control element value.
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*
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* Return: 0 on success.
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*/
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static int tascam_digital_out_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
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{
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struct tascam_card *tascam = snd_kcontrol_chip(kcontrol);
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ucontrol->value.enumerated.item[0] = tascam->digital_out_source;
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return 0;
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}
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/**
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* tascam_digital_out_put() - ALSA control put callback for Digital Outputs Source.
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* @kcontrol: The ALSA kcontrol instance.
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* @ucontrol: The ALSA control element value structure containing the new value.
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*
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* This function sets the Digital Outputs source (Playback 1-2 or Playback 3-4)
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* based on the user's selection from the ALSA control element. It validates
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* the input and updates the driver's private data.
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*
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* Return: 1 if the value was changed, 0 if unchanged, or a negative error code.
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*/
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static int tascam_digital_out_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
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{
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struct tascam_card *tascam = snd_kcontrol_chip(kcontrol);
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if (ucontrol->value.enumerated.item[0] > 1)
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return -EINVAL;
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if (tascam->digital_out_source == ucontrol->value.enumerated.item[0])
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return 0;
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tascam->digital_out_source = ucontrol->value.enumerated.item[0];
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return 1;
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}
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/**
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* tascam_digital_out_control - ALSA kcontrol definition for Digital Outputs Source.
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*
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* This defines a new ALSA mixer control named "Digital OUTPUTS Source" that allows
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* the user to select between "Playback 1-2" and "Playback 3-4" for the digital
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* outputs of the device. It uses the `tascam_playback_source_info` for
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* information and `tascam_digital_out_get`/`tascam_digital_out_put` for value handling.
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*/
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static const struct snd_kcontrol_new tascam_digital_out_control = {
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.iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = "Digital OUTPUTS Source",
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.info = tascam_playback_source_info, .get = tascam_digital_out_get, .put = tascam_digital_out_put,
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};
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/**
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* tascam_capture_source_info() - ALSA control info callback for capture source.
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* @kcontrol: The ALSA kcontrol instance.
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* @uinfo: The ALSA control element info structure to fill.
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*
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* This function provides information about the enumerated capture source
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* control, including its type, count, and available items (Analog In, Digital In).
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*
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* Return: 0 on success.
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*/
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static int tascam_capture_source_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
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{
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uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
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uinfo->count = 1;
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uinfo->value.enumerated.items = 2;
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if (uinfo->value.enumerated.item >= 2)
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uinfo->value.enumerated.item = 1;
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strscpy(uinfo->value.enumerated.name,
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capture_source_texts[uinfo->value.enumerated.item],
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sizeof(uinfo->value.enumerated.name));
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return 0;
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}
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/**
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* tascam_capture_12_get() - ALSA control get callback for Capture channels 1 and 2 Source.
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* @kcontrol: The ALSA kcontrol instance.
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* @ucontrol: The ALSA control element value structure to fill.
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*
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* This function retrieves the current selection for the Capture channels 1 and 2 source
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* (Analog In or Digital In) from the driver's private data and populates
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* the ALSA control element value.
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*
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* Return: 0 on success.
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*/
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static int tascam_capture_12_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
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{
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struct tascam_card *tascam = snd_kcontrol_chip(kcontrol);
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ucontrol->value.enumerated.item[0] = tascam->capture_12_source;
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return 0;
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}
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/**
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* tascam_capture_12_put() - ALSA control put callback for Capture channels 1 and 2 Source.
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* @kcontrol: The ALSA kcontrol instance.
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* @ucontrol: The ALSA control element value structure containing the new value.
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*
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* This function sets the Capture channels 1 and 2 source (Analog In or Digital In)
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* based on the user's selection from the ALSA control element. It validates
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* the input and updates the driver's private data.
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*
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* Return: 1 if the value was changed, 0 if unchanged, or a negative error code.
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*/
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static int tascam_capture_12_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
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{
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struct tascam_card *tascam = snd_kcontrol_chip(kcontrol);
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if (ucontrol->value.enumerated.item[0] > 1)
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return -EINVAL;
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if (tascam->capture_12_source == ucontrol->value.enumerated.item[0])
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return 0;
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tascam->capture_12_source = ucontrol->value.enumerated.item[0];
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return 1;
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}
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/**
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* tascam_capture_12_control - ALSA kcontrol definition for Capture channels 1 and 2 Source.
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*
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* This defines a new ALSA mixer control named "ch1 and ch2 Source" that allows
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* the user to select between "Analog In" and "Digital In" for the first two
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* capture channels of the device. It uses the `tascam_capture_source_info` for
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* information and `tascam_capture_12_get`/`tascam_capture_12_put` for value handling.
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*/
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static const struct snd_kcontrol_new tascam_capture_12_control = {
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.iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = "ch1 and ch2 Source",
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.info = tascam_capture_source_info, .get = tascam_capture_12_get, .put = tascam_capture_12_put,
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};
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/**
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* tascam_capture_34_get() - ALSA control get callback for Capture channels 3 and 4 Source.
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* @kcontrol: The ALSA kcontrol instance.
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* @ucontrol: The ALSA control element value structure to fill.
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*
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* This function retrieves the current selection for the Capture channels 3 and 4 source
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* (Analog In or Digital In) from the driver's private data and populates
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* the ALSA control element value.
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*
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* Return: 0 on success.
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*/
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static int tascam_capture_34_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
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{
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struct tascam_card *tascam = snd_kcontrol_chip(kcontrol);
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ucontrol->value.enumerated.item[0] = tascam->capture_34_source;
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return 0;
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}
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/**
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* tascam_capture_34_put() - ALSA control put callback for Capture channels 3 and 4 Source.
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* @kcontrol: The ALSA kcontrol instance.
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* @ucontrol: The ALSA control element value structure containing the new value.
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*
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* This function sets the Capture channels 3 and 4 source (Analog In or Digital In)
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* based on the user's selection from the ALSA control element. It validates
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* the input and updates the driver's private data.
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*
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* Return: 1 if the value was changed, 0 if unchanged, or a negative error code.
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*/
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static int tascam_capture_34_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
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{
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struct tascam_card *tascam = snd_kcontrol_chip(kcontrol);
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if (ucontrol->value.enumerated.item[0] > 1)
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return -EINVAL;
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if (tascam->capture_34_source == ucontrol->value.enumerated.item[0])
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return 0;
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tascam->capture_34_source = ucontrol->value.enumerated.item[0];
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return 1;
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}
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/**
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* tascam_capture_34_control - ALSA kcontrol definition for Capture channels 3 and 4 Source.
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*
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* This defines a new ALSA mixer control named "ch3 and ch4 Source" that allows
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* the user to select between "Analog In" and "Digital In" for the third and fourth
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* capture channels of the device. It uses the `tascam_capture_source_info` for
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* information and `tascam_capture_34_get`/`tascam_capture_34_put` for value handling.
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*/
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static const struct snd_kcontrol_new tascam_capture_34_control = {
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.iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = "ch3 and ch4 Source",
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.info = tascam_capture_source_info, .get = tascam_capture_34_get, .put = tascam_capture_34_put,
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};
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/**
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* tascam_samplerate_info() - ALSA control info callback for Sample Rate.
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* @kcontrol: The ALSA kcontrol instance.
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* @uinfo: The ALSA control element info structure to fill.
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*
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* This function provides information about the Sample Rate control, defining
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* it as an integer type with a minimum value of 0 and a maximum of 96000.
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*
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* Return: 0 on success.
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*/
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static int tascam_samplerate_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
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{
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uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
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uinfo->count = 1;
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uinfo->value.integer.min = 0;
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uinfo->value.integer.max = 96000;
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return 0;
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}
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/**
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* tascam_samplerate_get() - ALSA control get callback for Sample Rate.
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* @kcontrol: The ALSA kcontrol instance.
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* @ucontrol: The ALSA control element value structure to fill.
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*
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* This function retrieves the current sample rate from the device via a USB
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* control message and populates the ALSA control element value. If the rate
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* is already known (i.e., `current_rate` is set), it returns that value directly.
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*
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* Return: 0 on success, or a negative error code on failure.
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*/
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static int tascam_samplerate_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
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{
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struct tascam_card *tascam = (struct tascam_card *)snd_kcontrol_chip(kcontrol);
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u8 *buf;
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int err;
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u32 rate = 0;
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if (tascam->current_rate > 0) {
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ucontrol->value.integer.value[0] = tascam->current_rate;
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return 0;
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}
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buf = kmalloc(3, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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err = usb_control_msg(tascam->dev, usb_rcvctrlpipe(tascam->dev, 0),
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UAC_GET_CUR, RT_D2H_CLASS_EP,
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UAC_SAMPLING_FREQ_CONTROL, EP_AUDIO_IN,
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buf, 3, USB_CTRL_TIMEOUT_MS);
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if (err >= 3)
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rate = buf[0] | (buf[1] << 8) | (buf[2] << 16);
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ucontrol->value.integer.value[0] = rate;
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kfree(buf);
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return 0;
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}
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/**
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* tascam_samplerate_control - ALSA kcontrol definition for Sample Rate.
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*
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* This defines a new ALSA mixer control named "Sample Rate" that displays
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* the current sample rate of the device. It is a read-only control.
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*/
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static const struct snd_kcontrol_new tascam_samplerate_control = {
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.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
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.name = "Sample Rate",
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.info = tascam_samplerate_info,
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.get = tascam_samplerate_get,
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.access = SNDRV_CTL_ELEM_ACCESS_READ,
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};
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/**
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* tascam_create_controls() - Creates and adds ALSA mixer controls for the device.
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* @tascam: The driver instance.
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*
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* This function registers custom ALSA controls for managing audio routing
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* (line out source, digital out source, capture 1-2 source, capture 3-4 source)
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* and displaying the current sample rate.
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*
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* Return: 0 on success, or a negative error code on failure.
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*/
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int tascam_create_controls(struct tascam_card *tascam)
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{
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int err;
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err = snd_ctl_add(tascam->card, snd_ctl_new1(&tascam_line_out_control, tascam));
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if (err < 0)
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return err;
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err = snd_ctl_add(tascam->card, snd_ctl_new1(&tascam_digital_out_control, tascam));
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if (err < 0)
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return err;
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err = snd_ctl_add(tascam->card, snd_ctl_new1(&tascam_capture_12_control, tascam));
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if (err < 0)
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return err;
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err = snd_ctl_add(tascam->card, snd_ctl_new1(&tascam_capture_34_control, tascam));
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if (err < 0)
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return err;
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err = snd_ctl_add(tascam->card, snd_ctl_new1(&tascam_samplerate_control, tascam));
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if (err < 0)
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return err;
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return 0;
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}
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