drivers: dac: add checks for internal channel config

Return -ENOTSUP if these flags are specified but not supported.

Signed-off-by: Corey Wharton <xodus7@cwharton.com>

drivers/dac/dac_ad559x.c

@@ -43,6 +43,11 @@ static int dac_ad559x_channel_setup(const struct device *dev,
 		return -EINVAL;
 	}
 
+	if (channel_cfg->internal) {
+		LOG_ERR("Internal channels not supported");
+		return -ENOTSUP;
+	}
+
 	data->dac_conf |= BIT(channel_cfg->channel_id);
 
 	return mfd_ad559x_write_reg(config->mfd_dev, AD559X_REG_LDAC_EN, data->dac_conf);

drivers/dac/dac_ad569x.c

@@ -77,6 +77,11 @@ static int ad569x_channel_setup(const struct device *dev, const struct dac_chann
 		return -EINVAL;
 	}
 
+	if (channel_cfg->internal) {
+		LOG_ERR("Internal channels not supported");
+		return -ENOTSUP;
+	}
+
 	return 0;
 }
 

drivers/dac/dac_ad56xx.c

@@ -94,6 +94,11 @@ static int ad56xx_channel_setup(const struct device *dev, const struct dac_chann
 		return -EINVAL;
 	}
 
+	if (channel_cfg->internal) {
+		LOG_ERR("Internal channels not supported");
+		return -ENOTSUP;
+	}
+
 	return 0;
 }
 

drivers/dac/dac_dacx0501.c

@@ -106,6 +106,11 @@ static int dacx0501_channel_setup(const struct device *dev,
 		return -ENOTSUP;
 	}
 
+	if (channel_cfg->internal) {
+		LOG_ERR("Internal channels not supported");
+		return -ENOTSUP;
+	}
+
 	return 0;
 }
 

drivers/dac/dac_dacx0508.c

@@ -163,6 +163,11 @@ static int dacx0508_channel_setup(const struct device *dev,
 		return -ENOTSUP;
 	}
 
+	if (channel_cfg->internal) {
+		LOG_ERR("Internal channels not supported");
+		return -ENOTSUP;
+	}
+
 	data->configured |= BIT(channel_cfg->channel_id);
 
 	return 0;

drivers/dac/dac_dacx3608.c

@@ -102,6 +102,11 @@ static int dacx3608_channel_setup(const struct device *dev,
 		return -ENOTSUP;
 	}
 
+	if (channel_cfg->internal) {
+		LOG_ERR("Internal channels not supported");
+		return -ENOTSUP;
+	}
+
 	if (data->configured & BIT(channel_cfg->channel_id)) {
 		LOG_DBG("Channel %d already configured", channel_cfg->channel_id);
 		return 0;

drivers/dac/dac_esp32.c

@@ -44,6 +44,11 @@ static int dac_esp32_channel_setup(const struct device *dev,
 		return -EINVAL;
 	}
 
+	if (channel_cfg->internal) {
+		LOG_ERR("Internal channels not supported");
+		return -ENOTSUP;
+	}
+
 	dac_output_enable(channel_cfg->channel_id);
 
 	return 0;

drivers/dac/dac_gd32.c

@@ -115,6 +115,11 @@ static int dac_gd32_channel_setup(const struct device *dev,
 		return -ENOTSUP;
 	}
 
+	if (channel_cfg->internal) {
+		LOG_ERR("Internal channels not supported");
+		return -ENOTSUP;
+	}
+
 	data->resolutions[dacx] = channel_cfg->resolution;
 
 	dac_gd32_disable(dacx);

drivers/dac/dac_ltc166x.c

@@ -66,6 +66,11 @@ static int ltc166x_channel_setup(const struct device *dev,
 		return -ENOTSUP;
 	}
 
+	if (channel_cfg->internal) {
+		LOG_ERR("Internal channels not supported");
+		return -ENOTSUP;
+	}
+
 	return 0;
 }
 

drivers/dac/dac_mcp4725.c

@@ -76,6 +76,10 @@ static int mcp4725_channel_setup(const struct device *dev,
 		return -ENOTSUP;
 	}
 
+	if (channel_cfg->internal) {
+		return -ENOTSUP;
+	}
+
 	return 0;
 }
 

drivers/dac/dac_mcp4728.c

@@ -45,6 +45,10 @@ static int mcp4728_channel_setup(const struct device *dev,
 		return -ENOTSUP;
 	}
 
+	if (channel_cfg->internal) {
+		return -ENOTSUP;
+	}
+
 	return 0;
 }
 

drivers/dac/dac_mcux_dac.c

@@ -41,6 +41,11 @@ static int mcux_dac_channel_setup(const struct device *dev,
 		return -ENOTSUP;
 	}
 
+	if (channel_cfg->internal) {
+		LOG_ERR("Internal channels not supported");
+		return -ENOTSUP;
+	}
+
 	DAC_GetDefaultConfig(&dac_config);
 	dac_config.enableLowPowerMode = config->low_power;
 	dac_config.referenceVoltageSource = config->reference;

drivers/dac/dac_mcux_dac32.c

@@ -44,6 +44,11 @@ static int mcux_dac32_channel_setup(const struct device *dev,
 		return -ENOTSUP;
 	}
 
+	if (channel_cfg->internal) {
+		LOG_ERR("Internal channels not supported");
+		return -ENOTSUP;
+	}
+
 	DAC32_GetDefaultConfig(&dac32_config);
 	dac32_config.enableLowPowerMode = config->low_power;
 	dac32_config.referenceVoltageSource = config->reference;

drivers/dac/dac_mcux_gau.c

@@ -38,20 +38,25 @@ static int nxp_gau_dac_channel_setup(const struct device *dev,
 {
 	const struct nxp_gau_dac_config *config = dev->config;
 	dac_channel_config_t dac_channel_config = {0};
+	bool use_internal = true;
 
 	if (channel_cfg->resolution != 10) {
 		LOG_ERR("DAC only support 10 bit resolution");
 		return -EINVAL;
 	}
 
-	if (channel_cfg->buffered) {
+	if (channel_cfg->internal && channel_cfg->buffered) {
+		LOG_ERR("DAC output can not be buffered and internal");
+		return -EINVAL;
+	} else if (channel_cfg->buffered) {
 		/* External and internal output are mutually exclusive */
 		LOG_WRN("Note: buffering DAC output to pad disconnects internal output");
+		use_internal = false;
 	}
 
 	dac_channel_config.waveType = kDAC_WaveNormal;
-	dac_channel_config.outMode = channel_cfg->buffered ?
-				kDAC_ChannelOutputPAD : kDAC_ChannelOutputInternal;
+	dac_channel_config.outMode =
+		use_internal ? kDAC_ChannelOutputInternal : kDAC_ChannelOutputPAD;
 	dac_channel_config.timingMode = kDAC_NonTimingCorrelated;
 	dac_channel_config.enableTrigger = false;
 	dac_channel_config.enableDMA = false;

drivers/dac/dac_mcux_lpdac.c

@@ -41,6 +41,11 @@ static int mcux_lpdac_channel_setup(const struct device *dev,
 		return -ENOTSUP;
 	}
 
+	if (channel_cfg->internal) {
+		LOG_ERR("Internal channels not supported");
+		return -ENOTSUP;
+	}
+
 	DAC_GetDefaultConfig(&dac_config);
 	dac_config.referenceVoltageSource = config->ref_voltage;
 #if defined(FSL_FEATURE_LPDAC_HAS_GCR_BUF_SPD_CTRL) && FSL_FEATURE_LPDAC_HAS_GCR_BUF_SPD_CTRL

drivers/dac/dac_sam.c

@@ -85,6 +85,10 @@ static int dac_sam_channel_setup(const struct device *dev,
 		return -ENOTSUP;
 	}
 
+	if (channel_cfg->internal) {
+		return -ENOTSUP;
+	}
+
 	/* Enable Channel */
 	dac->DACC_CHER = DACC_CHER_CH0 << channel_cfg->channel_id;
 

drivers/dac/dac_sam0.c

@@ -63,6 +63,10 @@ static int dac_sam0_channel_setup(const struct device *dev,
 		return -ENOTSUP;
 	}
 
+	if (channel_cfg->internal) {
+		return -ENOSYS;
+	}
+
 	return 0;
 }