drivers/sensor: lis2dw12: add fds + hp_ref support

Add FDS (Filtered Data Type Selection) + High-Pass reference mode support
(FDS in CTRL6, HP_REF_MODE in CTRL7)
Values are configurable through DT per instance.

Signed-off-by: Maxime Vincent <maxime@veemax.be>

drivers/sensor/lis2dw12/lis2dw12.c

@@ -324,6 +324,22 @@ static int lis2dw12_init(const struct device *dev)
 	}
 #endif /* CONFIG_LIS2DW12_TRIGGER */
 
+	LOG_DBG("high pass reference mode is %d", (int)cfg->hp_ref_mode);
+	ret = lis2dw12_reference_mode_set(ctx, cfg->hp_ref_mode);
+	if (ret < 0) {
+		LOG_ERR("high pass reference mode config error %d", (int)cfg->hp_ref_mode);
+		return ret;
+	}
+
+	LOG_DBG("high pass filter path is %d", (int)cfg->hp_filter_path);
+	lis2dw12_fds_t fds = cfg->hp_filter_path ?
+		LIS2DW12_HIGH_PASS_ON_OUT : LIS2DW12_LPF_ON_OUT;
+	ret = lis2dw12_filter_path_set(ctx, fds);
+	if (ret < 0) {
+		LOG_ERR("filter path config error %d", (int)cfg->hp_filter_path);
+		return ret;
+	}
+
 	return 0;
 }
 
@@ -393,6 +409,8 @@ static int lis2dw12_init(const struct device *dev)
 		.range = DT_INST_PROP(inst, range),			\
 		.bw_filt = DT_INST_PROP(inst, bw_filt),      \
 		.low_noise = DT_INST_PROP(inst, low_noise),      \
+		.hp_filter_path = DT_INST_PROP(inst, hp_filter_path),      \
+		.hp_ref_mode = DT_INST_PROP(inst, hp_ref_mode), \
 		LIS2DW12_CONFIG_TAP(inst)				\
 		COND_CODE_1(DT_INST_NODE_HAS_PROP(inst, irq_gpios),	\
 			(LIS2DW12_CFG_IRQ(inst)), ())			\
@@ -419,6 +437,8 @@ static int lis2dw12_init(const struct device *dev)
 		.range = DT_INST_PROP(inst, range),			\
 		.bw_filt = DT_INST_PROP(inst, bw_filt),      \
 		.low_noise = DT_INST_PROP(inst, low_noise),      \
+		.hp_filter_path = DT_INST_PROP(inst, hp_filter_path),      \
+		.hp_ref_mode = DT_INST_PROP(inst, hp_ref_mode), \
 		LIS2DW12_CONFIG_TAP(inst)				\
 		COND_CODE_1(DT_INST_NODE_HAS_PROP(inst, irq_gpios),	\
 			(LIS2DW12_CFG_IRQ(inst)), ())			\

drivers/sensor/lis2dw12/lis2dw12.h

@@ -70,6 +70,8 @@ struct lis2dw12_device_config {
 	uint8_t range;
 	uint8_t bw_filt;
 	bool low_noise;
+	bool hp_filter_path;
+	bool hp_ref_mode;
 #ifdef CONFIG_LIS2DW12_TRIGGER
 	struct gpio_dt_spec gpio_int;
 	uint8_t int_pin;

dts/bindings/sensor/st,lis2dw12-common.yaml

@@ -164,3 +164,26 @@ properties:
         Enables the LOW_NOISE flag in the CTRL6 register.
         This influences the noise density and the current consumption.
         See the datasheet for more information.
+
+    hp-filter-path:
+      type: boolean
+      required: false
+      description: |
+        Sets the Filtered Data Selection bit in the CTRL6 register.
+        When enabled, the high-pass filter path is selected.
+        When disabled, the low-pass filter path is selected.
+        Note that this influences the OUT_REG / FIFO values,
+        but not the Wakeup function.
+
+    hp-ref-mode:
+      type: boolean
+      required: false
+      description: |
+        Enables the high-pass filter reference mode in the CTRL7 register.
+        When the high-pass filter is configured in reference mode,
+        the output data is calculated as the difference between the input
+        acceleration and the values captured when reference mode was enabled.
+        In this way only the difference is applied without any filtering
+        of the LIS2DW12.
+        Note that this influences both the OUT_REG / FIFO values,
+        as well as the Wakeup function.