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ALSA: scarlett2: Add S/PDIF source selection controls
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Add S/PDIF Source/Digital I/O Mode selection controls for the Scarlett
3rd Gen 18i8/18i20 and Clarett 4Pre/8Pre interfaces. These models have
both coax S/PDIF and optical inputs, and the optical inputs are
switchable between being used as S/PDIF and ADAT inputs. The Scarlett
3rd Gen 18i20 also has a "Dual ADAT" mode for 8-channel audio at
88.2/96kHz.

Signed-off-by: Geoffrey D. Bennett <g@b4.vu>
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geoffreybennett committed May 11, 2024
1 parent 07fee9b commit 95dd61c
Showing 1 changed file with 179 additions and 0 deletions.
179 changes: 179 additions & 0 deletions sound/usb/mixer_scarlett2.c
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Original file line number Diff line number Diff line change
Expand Up @@ -541,6 +541,7 @@ enum {
SCARLETT2_CONFIG_PCM_INPUT_SWITCH,
SCARLETT2_CONFIG_DIRECT_MONITOR_GAIN,
SCARLETT2_CONFIG_BLUETOOTH_VOLUME,
SCARLETT2_CONFIG_SPDIF_MODE,
SCARLETT2_CONFIG_COUNT
};

Expand Down Expand Up @@ -754,6 +755,9 @@ static const struct scarlett2_config_set scarlett2_config_set_gen3c = {

[SCARLETT2_CONFIG_TALKBACK_MAP] = {
.offset = 0xb0, .size = 16, .activate = 10 },

[SCARLETT2_CONFIG_SPDIF_MODE] = {
.offset = 0x94, .size = 8, .activate = 6 },
}
};

Expand Down Expand Up @@ -977,6 +981,9 @@ static const struct scarlett2_config_set scarlett2_config_set_clarett = {

[SCARLETT2_CONFIG_STANDALONE_SWITCH] = {
.offset = 0x8d, .size = 8, .activate = 6 },

[SCARLETT2_CONFIG_SPDIF_MODE] = {
.offset = 0x9e, .size = 8, .activate = 4 },
}
};

Expand Down Expand Up @@ -1147,6 +1154,11 @@ struct scarlett2_device_info {
/* has a Bluetooth module with volume control */
u8 has_bluetooth;

/* S/PDIF Source/Digital I/O mode control */
const char * const spdif_mode_control_name;
const u8 *spdif_mode_values;
const char * const *spdif_mode_texts;

/* remap analogue outputs; 18i8 Gen 3 has "line 3/4" connected
* internally to the analogue 7/8 outputs
*/
Expand Down Expand Up @@ -1255,6 +1267,7 @@ struct scarlett2_data {
u8 standalone_switch;
u8 power_status;
u8 bluetooth_volume;
u8 spdif_mode;
u8 meter_level_map[SCARLETT2_MAX_METERS];
struct snd_kcontrol *sync_ctl;
struct snd_kcontrol *master_vol_ctl;
Expand Down Expand Up @@ -1582,6 +1595,14 @@ static const struct scarlett2_device_info s8i6_gen3_info = {
}
};

static const u8 scarlett2_spdif_s18i8_gen3_values[] = { 0, 2, 0xff };

static const char * const scarlett2_spdif_s18i8_gen3_texts[] = {
"RCA",
"Optical",
NULL
};

static const struct scarlett2_device_info s18i8_gen3_info = {
.config_set = &scarlett2_config_set_gen3c,
.has_speaker_switching = 1,
Expand All @@ -1591,6 +1612,10 @@ static const struct scarlett2_device_info s18i8_gen3_info = {
.phantom_count = 2,
.inputs_per_phantom = 2,

.spdif_mode_control_name = "S/PDIF Mode Capture Enum",
.spdif_mode_values = scarlett2_spdif_s18i8_gen3_values,
.spdif_mode_texts = scarlett2_spdif_s18i8_gen3_texts,

.line_out_remap_enable = 1,
.line_out_remap = { 0, 1, 6, 7, 2, 3, 4, 5 },
.line_out_unmap = { 0, 1, 4, 5, 6, 7, 2, 3 },
Expand Down Expand Up @@ -1661,6 +1686,15 @@ static const struct scarlett2_device_info s18i8_gen3_info = {
}
};

static const u8 scarlett2_spdif_s18i20_gen3_values[] = { 0, 6, 1, 0xff };

static const char * const scarlett2_spdif_s18i20_gen3_texts[] = {
"S/PDIF RCA",
"S/PDIF Optical",
"Dual ADAT",
NULL
};

static const struct scarlett2_device_info s18i20_gen3_info = {
.config_set = &scarlett2_config_set_gen3c,
.has_speaker_switching = 1,
Expand All @@ -1671,6 +1705,10 @@ static const struct scarlett2_device_info s18i20_gen3_info = {
.phantom_count = 2,
.inputs_per_phantom = 4,

.spdif_mode_control_name = "Digital I/O Mode Capture Enum",
.spdif_mode_values = scarlett2_spdif_s18i20_gen3_values,
.spdif_mode_texts = scarlett2_spdif_s18i20_gen3_texts,

.line_out_descrs = {
"Monitor 1 L",
"Monitor 1 R",
Expand Down Expand Up @@ -2019,11 +2057,24 @@ static const struct scarlett2_device_info clarett_2pre_info = {
}
};

static const u8 scarlett2_spdif_clarett_values[] = { 0, 1, 2, 0xff };

static const char * const scarlett2_spdif_clarett_texts[] = {
"None",
"Optical",
"RCA",
NULL
};

static const struct scarlett2_device_info clarett_4pre_info = {
.config_set = &scarlett2_config_set_clarett,
.level_input_count = 2,
.air_input_count = 4,

.spdif_mode_control_name = "S/PDIF Source Capture Enum",
.spdif_mode_values = scarlett2_spdif_clarett_values,
.spdif_mode_texts = scarlett2_spdif_clarett_texts,

.line_out_descrs = {
"Monitor L",
"Monitor R",
Expand Down Expand Up @@ -2076,6 +2127,10 @@ static const struct scarlett2_device_info clarett_8pre_info = {
.level_input_count = 2,
.air_input_count = 8,

.spdif_mode_control_name = "S/PDIF Source Capture Enum",
.spdif_mode_values = scarlett2_spdif_clarett_values,
.spdif_mode_texts = scarlett2_spdif_clarett_texts,

.line_out_descrs = {
"Monitor L",
"Monitor R",
Expand Down Expand Up @@ -7885,6 +7940,121 @@ static int scarlett2_add_bluetooth_volume_ctl(
&private->bluetooth_volume_ctl);
}

/*** S/PDIF Mode Controls ***/

static int scarlett2_update_spdif_mode(struct usb_mixer_interface *mixer)
{
struct scarlett2_data *private = mixer->private_data;
int err, i;
u8 mode;
const u8 *mode_values = private->info->spdif_mode_values;

if (!private->info->spdif_mode_control_name)
return 0;

err = scarlett2_usb_get_config(mixer, SCARLETT2_CONFIG_SPDIF_MODE,
1, &mode);
if (err < 0)
return err;

private->spdif_mode = 0;

for (i = 0; *mode_values != 0xff; i++, mode_values++)
if (*mode_values == mode) {
private->spdif_mode = i;
break;
}

return 0;
}

static int scarlett2_spdif_mode_ctl_info(struct snd_kcontrol *kctl,
struct snd_ctl_elem_info *uinfo)
{
struct usb_mixer_elem_info *elem = kctl->private_data;
struct scarlett2_data *private = elem->head.mixer->private_data;
const char * const *mode_texts = private->info->spdif_mode_texts;
int count = 0;

while (*mode_texts++)
count++;

return snd_ctl_enum_info(uinfo, 1, count,
private->info->spdif_mode_texts);
}

static int scarlett2_spdif_mode_ctl_get(struct snd_kcontrol *kctl,
struct snd_ctl_elem_value *ucontrol)
{
struct usb_mixer_elem_info *elem = kctl->private_data;
struct scarlett2_data *private = elem->head.mixer->private_data;

ucontrol->value.enumerated.item[0] = private->spdif_mode;
return 0;
}

static int scarlett2_spdif_mode_ctl_put(struct snd_kcontrol *kctl,
struct snd_ctl_elem_value *ucontrol)
{
struct usb_mixer_elem_info *elem = kctl->private_data;
struct usb_mixer_interface *mixer = elem->head.mixer;
struct scarlett2_data *private = mixer->private_data;
int oval, val, err = 0;
int i;

mutex_lock(&private->data_mutex);

oval = private->spdif_mode;
val = ucontrol->value.enumerated.item[0];

if (val < 0) {
err = -EINVAL;
goto unlock;
}

for (i = 0; i <= val; i++)
if (private->info->spdif_mode_values[i] == 0xff) {
err = -EINVAL;
goto unlock;
}

if (oval == val)
goto unlock;

private->spdif_mode = val;

err = scarlett2_usb_set_config(
mixer, SCARLETT2_CONFIG_SPDIF_MODE, 0,
private->info->spdif_mode_values[val]);
if (!err)
err = 1;

unlock:
mutex_unlock(&private->data_mutex);
return err;
}

static const struct snd_kcontrol_new scarlett2_spdif_mode_ctl = {
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
.name = "",
.info = scarlett2_spdif_mode_ctl_info,
.get = scarlett2_spdif_mode_ctl_get,
.put = scarlett2_spdif_mode_ctl_put,
};

static int scarlett2_add_spdif_mode_ctl(struct usb_mixer_interface *mixer)
{
struct scarlett2_data *private = mixer->private_data;

if (!private->info->spdif_mode_control_name)
return 0;

return scarlett2_add_new_ctl(mixer, &scarlett2_spdif_mode_ctl,
0, 1,
private->info->spdif_mode_control_name,
NULL);
}

/*** Notification Handlers ***/

/* Notify on sync change */
Expand Down Expand Up @@ -8797,6 +8967,10 @@ static int scarlett2_read_configs(struct usb_mixer_interface *mixer)
if (err < 0)
return err;

err = scarlett2_update_spdif_mode(mixer);
if (err < 0)
return err;

err = scarlett2_update_mix(mixer);
if (err < 0)
return err;
Expand Down Expand Up @@ -8929,6 +9103,11 @@ static int snd_scarlett2_controls_create(
if (err < 0)
return err;

/* Create the S/PDIF mode control */
err = scarlett2_add_spdif_mode_ctl(mixer);
if (err < 0)
return err;

/* Set the access mode of controls disabled during
* autogain/phantom power switching.
*/
Expand Down

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