ASoC: SOF: ipc4-control: Support for Switch and Enum

Merge series from Peter Ujfalusi <peter.ujfalusi@linux.intel.com>:

Currently IPC4 has no notion of a switch or enum type of control which
is a generic concept in ALSA.

The generic support for these control types will be as follows:

- large config is used to send the channel-value par array
- param_id of a SWITCH type is 200
- param_id of an ENUM type is 201

Each module need to support a switch or/and enum must handle these
universal param_ids.  The message payload is described by struct
sof_ipc4_control_msg_payload.

sound/soc/sof/ipc4-control.c

@@ -201,6 +201,159 @@ static int sof_ipc4_volume_get(struct snd_sof_control *scontrol,
 	return 0;
 }
 
+static int
+sof_ipc4_set_generic_control_data(struct snd_sof_dev *sdev,
+				  struct snd_sof_widget *swidget,
+				  struct snd_sof_control *scontrol, bool lock)
+{
+	struct sof_ipc4_control_data *cdata = scontrol->ipc_control_data;
+	struct sof_ipc4_control_msg_payload *data;
+	struct sof_ipc4_msg *msg = &cdata->msg;
+	size_t data_size;
+	unsigned int i;
+	int ret;
+
+	data_size = struct_size(data, chanv, scontrol->num_channels);
+	data = kzalloc(data_size, GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->id = cdata->index;
+	data->num_elems = scontrol->num_channels;
+	for (i = 0; i < scontrol->num_channels; i++) {
+		data->chanv[i].channel = cdata->chanv[i].channel;
+		data->chanv[i].value = cdata->chanv[i].value;
+	}
+
+	msg->data_ptr = data;
+	msg->data_size = data_size;
+
+	ret = sof_ipc4_set_get_kcontrol_data(scontrol, true, lock);
+	msg->data_ptr = NULL;
+	msg->data_size = 0;
+	if (ret < 0)
+		dev_err(sdev->dev, "Failed to set control update for %s\n",
+			scontrol->name);
+
+	kfree(data);
+
+	return ret;
+}
+
+static bool sof_ipc4_switch_put(struct snd_sof_control *scontrol,
+				struct snd_ctl_elem_value *ucontrol)
+{
+	struct sof_ipc4_control_data *cdata = scontrol->ipc_control_data;
+	struct snd_soc_component *scomp = scontrol->scomp;
+	struct snd_sof_dev *sdev = snd_soc_component_get_drvdata(scomp);
+	struct snd_sof_widget *swidget;
+	bool widget_found = false;
+	bool change = false;
+	unsigned int i;
+	u32 value;
+	int ret;
+
+	/* update each channel */
+	for (i = 0; i < scontrol->num_channels; i++) {
+		value = ucontrol->value.integer.value[i];
+		change = change || (value != cdata->chanv[i].value);
+		cdata->chanv[i].channel = i;
+		cdata->chanv[i].value = value;
+	}
+
+	if (!pm_runtime_active(scomp->dev))
+		return change;
+
+	/* find widget associated with the control */
+	list_for_each_entry(swidget, &sdev->widget_list, list) {
+		if (swidget->comp_id == scontrol->comp_id) {
+			widget_found = true;
+			break;
+		}
+	}
+
+	if (!widget_found) {
+		dev_err(scomp->dev, "Failed to find widget for kcontrol %s\n", scontrol->name);
+		return false;
+	}
+
+	ret = sof_ipc4_set_generic_control_data(sdev, swidget, scontrol, true);
+	if (ret < 0)
+		return false;
+
+	return change;
+}
+
+static int sof_ipc4_switch_get(struct snd_sof_control *scontrol,
+			       struct snd_ctl_elem_value *ucontrol)
+{
+	struct sof_ipc4_control_data *cdata = scontrol->ipc_control_data;
+	unsigned int i;
+
+	/* read back each channel */
+	for (i = 0; i < scontrol->num_channels; i++)
+		ucontrol->value.integer.value[i] = cdata->chanv[i].value;
+
+	return 0;
+}
+
+static bool sof_ipc4_enum_put(struct snd_sof_control *scontrol,
+			      struct snd_ctl_elem_value *ucontrol)
+{
+	struct sof_ipc4_control_data *cdata = scontrol->ipc_control_data;
+	struct snd_soc_component *scomp = scontrol->scomp;
+	struct snd_sof_dev *sdev = snd_soc_component_get_drvdata(scomp);
+	struct snd_sof_widget *swidget;
+	bool widget_found = false;
+	bool change = false;
+	unsigned int i;
+	u32 value;
+	int ret;
+
+	/* update each channel */
+	for (i = 0; i < scontrol->num_channels; i++) {
+		value = ucontrol->value.enumerated.item[i];
+		change = change || (value != cdata->chanv[i].value);
+		cdata->chanv[i].channel = i;
+		cdata->chanv[i].value = value;
+	}
+
+	if (!pm_runtime_active(scomp->dev))
+		return change;
+
+	/* find widget associated with the control */
+	list_for_each_entry(swidget, &sdev->widget_list, list) {
+		if (swidget->comp_id == scontrol->comp_id) {
+			widget_found = true;
+			break;
+		}
+	}
+
+	if (!widget_found) {
+		dev_err(scomp->dev, "Failed to find widget for kcontrol %s\n", scontrol->name);
+		return false;
+	}
+
+	ret = sof_ipc4_set_generic_control_data(sdev, swidget, scontrol, true);
+	if (ret < 0)
+		return false;
+
+	return change;
+}
+
+static int sof_ipc4_enum_get(struct snd_sof_control *scontrol,
+			     struct snd_ctl_elem_value *ucontrol)
+{
+	struct sof_ipc4_control_data *cdata = scontrol->ipc_control_data;
+	unsigned int i;
+
+	/* read back each channel */
+	for (i = 0; i < scontrol->num_channels; i++)
+		ucontrol->value.enumerated.item[i] = cdata->chanv[i].value;
+
+	return 0;
+}
+
 static int sof_ipc4_set_get_bytes_data(struct snd_sof_dev *sdev,
 				       struct snd_sof_control *scontrol,
 				       bool set, bool lock)
@@ -438,6 +591,16 @@ static int sof_ipc4_bytes_ext_volatile_get(struct snd_sof_control *scontrol,
 	return _sof_ipc4_bytes_ext_get(scontrol, binary_data, size, true);
 }
 
+static int
+sof_ipc4_volsw_setup(struct snd_sof_dev *sdev, struct snd_sof_widget *swidget,
+		     struct snd_sof_control *scontrol)
+{
+	if (scontrol->max == 1)
+		return sof_ipc4_set_generic_control_data(sdev, swidget, scontrol, false);
+
+	return sof_ipc4_set_volume_data(sdev, swidget, scontrol, false);
+}
+
 /* set up all controls for the widget */
 static int sof_ipc4_widget_kcontrol_setup(struct snd_sof_dev *sdev, struct snd_sof_widget *swidget)
 {
@@ -450,13 +613,17 @@ static int sof_ipc4_widget_kcontrol_setup(struct snd_sof_dev *sdev, struct snd_s
 			case SND_SOC_TPLG_CTL_VOLSW:
 			case SND_SOC_TPLG_CTL_VOLSW_SX:
 			case SND_SOC_TPLG_CTL_VOLSW_XR_SX:
-				ret = sof_ipc4_set_volume_data(sdev, swidget,
-							       scontrol, false);
+				ret = sof_ipc4_volsw_setup(sdev, swidget, scontrol);
 				break;
 			case SND_SOC_TPLG_CTL_BYTES:
 				ret = sof_ipc4_set_get_bytes_data(sdev, scontrol,
 								  true, false);
 				break;
+			case SND_SOC_TPLG_CTL_ENUM:
+			case SND_SOC_TPLG_CTL_ENUM_VALUE:
+				ret = sof_ipc4_set_generic_control_data(sdev, swidget,
+									scontrol, false);
+				break;
 			default:
 				break;
 			}
@@ -498,6 +665,10 @@ sof_ipc4_set_up_volume_table(struct snd_sof_control *scontrol, int tlv[SOF_TLV_I
 const struct sof_ipc_tplg_control_ops tplg_ipc4_control_ops = {
 	.volume_put = sof_ipc4_volume_put,
 	.volume_get = sof_ipc4_volume_get,
+	.switch_put = sof_ipc4_switch_put,
+	.switch_get = sof_ipc4_switch_get,
+	.enum_put = sof_ipc4_enum_put,
+	.enum_get = sof_ipc4_enum_get,
 	.bytes_put = sof_ipc4_bytes_put,
 	.bytes_get = sof_ipc4_bytes_get,
 	.bytes_ext_put = sof_ipc4_bytes_ext_put,

sound/soc/sof/ipc4-topology.c

@@ -2107,17 +2107,57 @@ static int sof_ipc4_control_load_volume(struct snd_sof_dev *sdev, struct snd_sof
 	msg->primary |= SOF_IPC4_MSG_DIR(SOF_IPC4_MSG_REQUEST);
 	msg->primary |= SOF_IPC4_MSG_TARGET(SOF_IPC4_MODULE_MSG);
 
+	/* volume controls with range 0-1 (off/on) are switch controls */
+	if (scontrol->max == 1)
+		msg->extension = SOF_IPC4_MOD_EXT_MSG_PARAM_ID(SOF_IPC4_SWITCH_CONTROL_PARAM_ID);
+	else
 		msg->extension = SOF_IPC4_MOD_EXT_MSG_PARAM_ID(SOF_IPC4_GAIN_PARAM_ID);
 
-	/* set default volume values to 0dB in control */
 	for (i = 0; i < scontrol->num_channels; i++) {
 		control_data->chanv[i].channel = i;
+		/*
+		 * Default, initial values:
+		 * - 0dB for volume controls
+		 * - off (0) for switch controls - value already zero after
+		 *				   memory allocation
+		 */
+		if (scontrol->max > 1)
 			control_data->chanv[i].value = SOF_IPC4_VOL_ZERO_DB;
 	}
 
 	return 0;
 }
 
+static int sof_ipc4_control_load_enum(struct snd_sof_dev *sdev, struct snd_sof_control *scontrol)
+{
+	struct sof_ipc4_control_data *control_data;
+	struct sof_ipc4_msg *msg;
+	int i;
+
+	scontrol->size = struct_size(control_data, chanv, scontrol->num_channels);
+
+	/* scontrol->ipc_control_data will be freed in sof_control_unload */
+	scontrol->ipc_control_data = kzalloc(scontrol->size, GFP_KERNEL);
+	if (!scontrol->ipc_control_data)
+		return -ENOMEM;
+
+	control_data = scontrol->ipc_control_data;
+	control_data->index = scontrol->index;
+
+	msg = &control_data->msg;
+	msg->primary = SOF_IPC4_MSG_TYPE_SET(SOF_IPC4_MOD_LARGE_CONFIG_SET);
+	msg->primary |= SOF_IPC4_MSG_DIR(SOF_IPC4_MSG_REQUEST);
+	msg->primary |= SOF_IPC4_MSG_TARGET(SOF_IPC4_MODULE_MSG);
+
+	msg->extension = SOF_IPC4_MOD_EXT_MSG_PARAM_ID(SOF_IPC4_ENUM_CONTROL_PARAM_ID);
+
+	/* Default, initial value for enums: first enum entry is selected (0) */
+	for (i = 0; i < scontrol->num_channels; i++)
+		control_data->chanv[i].channel = i;
+
+	return 0;
+}
+
 static int sof_ipc4_control_load_bytes(struct snd_sof_dev *sdev, struct snd_sof_control *scontrol)
 {
 	struct sof_ipc4_control_data *control_data;
@@ -2192,6 +2232,9 @@ static int sof_ipc4_control_setup(struct snd_sof_dev *sdev, struct snd_sof_contr
 		return sof_ipc4_control_load_volume(sdev, scontrol);
 	case SND_SOC_TPLG_CTL_BYTES:
 		return sof_ipc4_control_load_bytes(sdev, scontrol);
+	case SND_SOC_TPLG_CTL_ENUM:
+	case SND_SOC_TPLG_CTL_ENUM_VALUE:
+		return sof_ipc4_control_load_enum(sdev, scontrol);
 	default:
 		break;
 	}

sound/soc/sof/ipc4-topology.h

@@ -319,7 +319,7 @@ struct sof_ipc4_copier {
 /**
  * struct sof_ipc4_ctrl_value_chan: generic channel mapped value data
  * @channel: Channel ID
- * @value: gain value
+ * @value: Value associated with @channel
  */
 struct sof_ipc4_ctrl_value_chan {
 	u32 channel;
@@ -343,6 +343,23 @@ struct sof_ipc4_control_data {
 	};
 };
 
+#define SOF_IPC4_SWITCH_CONTROL_PARAM_ID	200
+#define SOF_IPC4_ENUM_CONTROL_PARAM_ID		201
+
+/**
+ * struct sof_ipc4_control_msg_payload - IPC payload for kcontrol parameters
+ * @id: unique id of the control
+ * @num_elems: Number of elements in the chanv array
+ * @reserved: reserved for future use, must be set to 0
+ * @chanv: channel ID and value array
+ */
+struct sof_ipc4_control_msg_payload {
+	uint16_t id;
+	uint16_t num_elems;
+	uint32_t reserved[4];
+	DECLARE_FLEX_ARRAY(struct sof_ipc4_ctrl_value_chan, chanv);
+} __packed;
+
 /**
  * struct sof_ipc4_gain_data - IPC gain blob
  * @channels: Channels