bluetooth: hci: add kconfigs and handling for new vs command

a new VS command was added for CS that allows the setting of multiple
different CS parameters.

added a KConfig to use the set T_PM functionality of the new vs command.

Signed-off-by: Thomas Johansen <[email protected]>

Author: thomas-m-johansen

subsys/bluetooth/controller/Kconfig

@@ -635,6 +635,50 @@ config BT_CTLR_SDC_CS_EVENT_LEN_DEFAULT
 	help
 	  The time set aside for channel sounding events in microseconds.
 
+choice BT_CTLR_SDC_CS_T_PM_LEN_DEFAULT_SELECTION
+prompt "Default channel sounding t_pm length"
+	depends on BT_CTLR_CHANNEL_SOUNDING
+	default BT_CTLR_SDC_CS_T_PM_LEN_10_US
+	help
+	  Set the preferred tone length (T_PM) of CS tones
+
+	  In Channel Sounding, tones in step mode-2 and -3 have a length of t_pm microseconds.
+	  T_PM can be 10, 20 or 40 microseconds.
+
+	  Since the T_PM can affect the quality of tone measurements, it is important for
+	  certain use-cases to be able to set a preferred T_PM. The controller will then use
+	  this value when the LE CS Create Config command is issued.
+
+	  If the local or peer device does not support the suggested preferred T_PM, it cannot
+	  be used. The controller will then select a T_PM value supported by both local and
+	  peer devices when the LE CS Create Config command is issued.
+
+config BT_CTLR_SDC_CS_T_PM_LEN_10_US
+	bool "10 us"
+	depends on BT_CTLR_CHANNEL_SOUNDING
+	help
+	  Set controller default channel sounding tones to 10 microseconds.
+
+config BT_CTLR_SDC_CS_T_PM_LEN_20_US
+	bool "20 us"
+	depends on BT_CTLR_CHANNEL_SOUNDING
+	help
+	  Set controller default channel sounding tones to 20 microseconds.
+
+config BT_CTLR_SDC_CS_T_PM_LEN_40_US
+	bool "40 us"
+	depends on BT_CTLR_CHANNEL_SOUNDING
+	help
+	  Set controller default channel sounding tones to 40 microseconds.
+endchoice
+
+config BT_CTLR_SDC_CS_T_PM_LEN_DEFAULT
+	int
+	depends on BT_CTLR_CHANNEL_SOUNDING
+	default 10 if BT_CTLR_SDC_CS_T_PM_LEN_10_US
+	default 20 if BT_CTLR_SDC_CS_T_PM_LEN_20_US
+	default 40 if BT_CTLR_SDC_CS_T_PM_LEN_40_US
+
 config BT_CTLR_SDC_LE_POWER_CLASS_1
 	bool "Device supports transmitting at LE Power Class 1 level"
 	default y if BT_CTLR_TX_PWR_ANTENNA >= 10

subsys/bluetooth/controller/hci_driver.c

@@ -1459,6 +1459,19 @@ static int hci_driver_open(const struct device *dev, bt_hci_recv_t recv_func)
 	}
 #endif /* CONFIG_BT_CTLR_CHANNEL_SOUNDING */
 
+#if defined(CONFIG_BT_CTLR_CHANNEL_SOUNDING)
+	sdc_hci_cmd_vs_cs_params_set_t cs_params_set_t_pm_length = {
+		.cs_param_type = SDC_HCI_VS_CS_PARAM_TYPE_CS_T_PM_SET,
+		.cs_param_data.cs_t_pm_params.cs_t_pm_length_us =
+			CONFIG_BT_CTLR_SDC_CS_T_PM_LEN_DEFAULT
+	};
+	err = sdc_hci_cmd_vs_cs_params_set(&cs_params_set_t_pm_length);
+	if (err) {
+		MULTITHREADING_LOCK_RELEASE();
+		return -ENOTSUP;
+	}
+#endif /* CONFIG_BT_CTLR_CHANNEL_SOUNDING */
+
 #if defined(CONFIG_BT_CTLR_SDC_BIG_RESERVED_TIME_US)
 	sdc_hci_cmd_vs_big_reserved_time_set_t big_reserved_time_params = {
 		.reserved_time_us = CONFIG_BT_CTLR_SDC_BIG_RESERVED_TIME_US