Some inputs on Gen 3 models support software-selectable phantom power. Add support for getting and setting the state of those switches and the "Phantom Power Persistence" switch.
Co-developed-by: Vladimir Sadovnikov sadko4u@gmail.com Signed-off-by: Vladimir Sadovnikov sadko4u@gmail.com Signed-off-by: Geoffrey D. Bennett g@b4.vu --- sound/usb/mixer_scarlett_gen2.c | 197 +++++++++++++++++++++++++++++++- 1 file changed, 196 insertions(+), 1 deletion(-)
diff --git a/sound/usb/mixer_scarlett_gen2.c b/sound/usb/mixer_scarlett_gen2.c index 696d9703436a..bc4f29cfb2f3 100644 --- a/sound/usb/mixer_scarlett_gen2.c +++ b/sound/usb/mixer_scarlett_gen2.c @@ -48,12 +48,15 @@ * Support for Solo/2i2 Gen 3 added in May 2021 (thanks to Alexander * Vorona for 2i2 protocol traces). * + * Support for phantom power added in May 2021. + * * This ALSA mixer gives access to (model-dependent): * - input, output, mixer-matrix muxes * - mixer-matrix gain stages * - gain/volume/mute controls * - level meters * - line/inst level, pad, and air controls + * - phantom power controls * - disable/enable MSD mode * * <ditaa> @@ -174,6 +177,7 @@ static const u16 scarlett2_mixer_values[SCARLETT2_MIXER_VALUE_COUNT] = { #define SCARLETT2_LEVEL_SWITCH_MAX 2 #define SCARLETT2_PAD_SWITCH_MAX 8 #define SCARLETT2_AIR_SWITCH_MAX 8 +#define SCARLETT2_PHANTOM_SWITCH_MAX 2
/* Maximum number of inputs to the mixer */ #define SCARLETT2_INPUT_MIX_MAX 25 @@ -328,6 +332,12 @@ struct scarlett2_device_info { */ u8 air_input_count;
+ /* the number of phantom (48V) software switchable controls */ + u8 phantom_count; + + /* the number of inputs each phantom switch controls */ + u8 inputs_per_phantom; + /* additional description for the line out volume controls */ const char * const line_out_descrs[SCARLETT2_ANALOGUE_MAX];
@@ -364,6 +374,8 @@ struct scarlett2_data { u8 pad_switch[SCARLETT2_PAD_SWITCH_MAX]; u8 dim_mute[SCARLETT2_DIM_MUTE_COUNT]; u8 air_switch[SCARLETT2_AIR_SWITCH_MAX]; + u8 phantom_switch[SCARLETT2_PHANTOM_SWITCH_MAX]; + u8 phantom_persistence; u8 msd_switch; struct snd_kcontrol *sync_ctl; struct snd_kcontrol *master_vol_ctl; @@ -373,6 +385,7 @@ struct scarlett2_data { struct snd_kcontrol *level_ctls[SCARLETT2_LEVEL_SWITCH_MAX]; struct snd_kcontrol *pad_ctls[SCARLETT2_PAD_SWITCH_MAX]; struct snd_kcontrol *air_ctls[SCARLETT2_AIR_SWITCH_MAX]; + struct snd_kcontrol *phantom_ctls[SCARLETT2_PHANTOM_SWITCH_MAX]; u8 mux[SCARLETT2_MUX_MAX]; u8 mix[SCARLETT2_INPUT_MIX_MAX * SCARLETT2_OUTPUT_MIX_MAX]; }; @@ -535,6 +548,8 @@ static const struct scarlett2_device_info solo_gen3_info = { .level_input_count = 1, .level_input_first = 1, .air_input_count = 1, + .phantom_count = 1, + .inputs_per_phantom = 1, };
static const struct scarlett2_device_info s2i2_gen3_info = { @@ -543,6 +558,8 @@ static const struct scarlett2_device_info s2i2_gen3_info = { .has_msd_mode = 1, .level_input_count = 2, .air_input_count = 2, + .phantom_count = 1, + .inputs_per_phantom = 2, };
static const struct scarlett2_device_info s4i4_gen3_info = { @@ -553,6 +570,8 @@ static const struct scarlett2_device_info s4i4_gen3_info = { .level_input_count = 2, .pad_input_count = 2, .air_input_count = 2, + .phantom_count = 1, + .inputs_per_phantom = 2,
.line_out_descrs = { "Monitor L", @@ -597,6 +616,8 @@ static const struct scarlett2_device_info s8i6_gen3_info = { .level_input_count = 2, .pad_input_count = 2, .air_input_count = 2, + .phantom_count = 1, + .inputs_per_phantom = 2,
.line_out_descrs = { "Headphones 1 L", @@ -649,6 +670,8 @@ static const struct scarlett2_device_info s18i8_gen3_info = { .level_input_count = 2, .pad_input_count = 2, .air_input_count = 4, + .phantom_count = 2, + .inputs_per_phantom = 2,
.line_out_descrs = { "Monitor L", @@ -713,6 +736,8 @@ static const struct scarlett2_device_info s18i20_gen3_info = { .level_input_count = 2, .pad_input_count = 8, .air_input_count = 8, + .phantom_count = 2, + .inputs_per_phantom = 4,
.line_out_descrs = { "Monitor 1 L", @@ -861,7 +886,9 @@ enum { SCARLETT2_CONFIG_PAD_SWITCH = 5, SCARLETT2_CONFIG_MSD_SWITCH = 6, SCARLETT2_CONFIG_AIR_SWITCH = 7, - SCARLETT2_CONFIG_COUNT = 8 + SCARLETT2_CONFIG_PHANTOM_SWITCH = 8, + SCARLETT2_CONFIG_PHANTOM_PERSISTENCE = 9, + SCARLETT2_CONFIG_COUNT = 10 };
/* Location, size, and activation command number for the configuration @@ -884,6 +911,12 @@ static const struct scarlett2_config [SCARLETT2_CONFIG_MSD_SWITCH] = { .offset = 0x04, .size = 8, .activate = 6 },
+ [SCARLETT2_CONFIG_PHANTOM_PERSISTENCE] = { + .offset = 0x05, .size = 8, .activate = 6 }, + + [SCARLETT2_CONFIG_PHANTOM_SWITCH] = { + .offset = 0x06, .size = 8, .activate = 3 }, + [SCARLETT2_CONFIG_LEVEL_SWITCH] = { .offset = 0x08, .size = 1, .activate = 7 },
@@ -913,8 +946,14 @@ static const struct scarlett2_config [SCARLETT2_CONFIG_AIR_SWITCH] = { .offset = 0x8c, .size = 8, .activate = 8 },
+ [SCARLETT2_CONFIG_PHANTOM_SWITCH] = { + .offset = 0x9c, .size = 1, .activate = 8 }, + [SCARLETT2_CONFIG_MSD_SWITCH] = { .offset = 0x9d, .size = 8, .activate = 6 }, + + [SCARLETT2_CONFIG_PHANTOM_PERSISTENCE] = { + .offset = 0x9e, .size = 8, .activate = 6 }, } };
/* proprietary request/response format */ @@ -1927,6 +1966,20 @@ static int scarlett2_update_input_other(struct usb_mixer_interface *mixer) return err; }
+ if (info->phantom_count) { + int err = scarlett2_usb_get_config( + mixer, SCARLETT2_CONFIG_PHANTOM_SWITCH, + info->phantom_count, private->phantom_switch); + if (err < 0) + return err; + + err = scarlett2_usb_get_config( + mixer, SCARLETT2_CONFIG_PHANTOM_PERSISTENCE, + 1, &private->phantom_persistence); + if (err < 0) + return err; + } + return 0; }
@@ -2112,6 +2165,111 @@ static const struct snd_kcontrol_new scarlett2_air_ctl = { .put = scarlett2_air_ctl_put, };
+/*** Phantom Switch Controls ***/ + +static int scarlett2_phantom_ctl_get(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; + + mutex_lock(&private->data_mutex); + if (private->input_other_updated) + scarlett2_update_input_other(mixer); + ucontrol->value.integer.value[0] = + private->phantom_switch[elem->control]; + mutex_unlock(&private->data_mutex); + + return 0; +} + +static int scarlett2_phantom_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 index = elem->control; + int oval, val, err = 0; + + mutex_lock(&private->data_mutex); + + oval = private->phantom_switch[index]; + val = !!ucontrol->value.integer.value[0]; + + if (oval == val) + goto unlock; + + private->phantom_switch[index] = val; + + /* Send switch change to the device */ + err = scarlett2_usb_set_config(mixer, SCARLETT2_CONFIG_PHANTOM_SWITCH, + index, val); + +unlock: + mutex_unlock(&private->data_mutex); + return err; +} + +static const struct snd_kcontrol_new scarlett2_phantom_ctl = { + .iface = SNDRV_CTL_ELEM_IFACE_MIXER, + .name = "", + .info = snd_ctl_boolean_mono_info, + .get = scarlett2_phantom_ctl_get, + .put = scarlett2_phantom_ctl_put, +}; + +/*** Phantom Persistence Control ***/ + +static int scarlett2_phantom_persistence_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.integer.value[0] = private->phantom_persistence; + return 0; +} + +static int scarlett2_phantom_persistence_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 index = elem->control; + int oval, val, err = 0; + + mutex_lock(&private->data_mutex); + + oval = private->phantom_persistence; + val = !!ucontrol->value.integer.value[0]; + + if (oval == val) + goto unlock; + + private->phantom_persistence = val; + + /* Send switch change to the device */ + err = scarlett2_usb_set_config( + mixer, SCARLETT2_CONFIG_PHANTOM_PERSISTENCE, index, val); + +unlock: + mutex_unlock(&private->data_mutex); + return err; +} + +static const struct snd_kcontrol_new scarlett2_phantom_persistence_ctl = { + .iface = SNDRV_CTL_ELEM_IFACE_MIXER, + .name = "", + .info = snd_ctl_boolean_mono_info, + .get = scarlett2_phantom_persistence_ctl_get, + .put = scarlett2_phantom_persistence_ctl_put, +}; + /*** Dim/Mute Controls ***/
static int scarlett2_dim_mute_ctl_get(struct snd_kcontrol *kctl, @@ -2275,6 +2433,7 @@ static int scarlett2_add_line_in_ctls(struct usb_mixer_interface *mixer) int err, i; char s[SNDRV_CTL_ELEM_ID_NAME_MAXLEN]; const char *fmt = "Line In %d %s Capture %s"; + const char *fmt2 = "Line In %d-%d %s Capture %s";
/* Add input level (line/inst) controls */ for (i = 0; i < info->level_input_count; i++) { @@ -2304,6 +2463,39 @@ static int scarlett2_add_line_in_ctls(struct usb_mixer_interface *mixer) return err; }
+ /* Add input phantom controls */ + if (info->inputs_per_phantom == 1) { + for (i = 0; i < info->phantom_count; i++) { + snprintf(s, sizeof(s), fmt, i + 1, + "Phantom Power", "Switch"); + err = scarlett2_add_new_ctl( + mixer, &scarlett2_phantom_ctl, + i, 1, s, &private->phantom_ctls[i]); + if (err < 0) + return err; + } + } else if (info->inputs_per_phantom > 1) { + for (i = 0; i < info->phantom_count; i++) { + int from = i * info->inputs_per_phantom + 1; + int to = (i + 1) * info->inputs_per_phantom; + + snprintf(s, sizeof(s), fmt2, from, to, + "Phantom Power", "Switch"); + err = scarlett2_add_new_ctl( + mixer, &scarlett2_phantom_ctl, + i, 1, s, &private->phantom_ctls[i]); + if (err < 0) + return err; + } + } + if (info->phantom_count) { + err = scarlett2_add_new_ctl( + mixer, &scarlett2_phantom_persistence_ctl, 0, 1, + "Phantom Power Persistence Capture Switch", NULL); + if (err < 0) + return err; + } + return 0; }
@@ -2932,6 +3124,9 @@ static void scarlett2_notify_input_other( for (i = 0; i < info->air_input_count; i++) snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, &private->air_ctls[i]->id); + for (i = 0; i < info->phantom_count; i++) + snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, + &private->phantom_ctls[i]->id); }
/* Interrupt callback */